ctrl-r key

bugfix: playing failed with tracks of unknown length
keys: added yank keys

.gitignore

@@ -1,2 +1,2 @@
 demo
-muf
+fuzic

scripts/build.sh

@@ -3,16 +3,14 @@
 BOLD="\033[1m"
 GREEN="\033[0;32m"
 OFF="\033[m"
-NAME="muf"
+NAME="fuzic"
 SRC="./src/main.sh"
 
 tmpdir=$(mktemp -d)
-echo "🐔 ${GREEN}Internalize sourced files${OFF}"
+echo "🥚 ${GREEN}Internalize sourced files${OFF}"
 sed -E 's|\. "([^$].+)"$|cat src/\1|e' "$SRC" >"$tmpdir/1.sh"
-echo "🥚 ${GREEN}Internalize awk scripts${OFF}"
+echo "🐔 ${GREEN}Internalize awk scripts${OFF}"
-sed -E 's|@@include (.+)$|cat src/\1|e' "$tmpdir/1.sh" >"$tmpdir/2.sh"
+sed -E 's|@@include (.+)$|cat src/\1|e' "$tmpdir/1.sh" >"$NAME"
-echo "🐔 ${GREEN}Internalize awk libraries${OFF}"
-sed -E 's|@include "(.+)"$|cat src/\1|e' "$tmpdir/2.sh" >"$NAME"
 echo "🥚 ${GREEN}Make executable and cleanup${OFF}"
 chmod +x "$NAME"
 rm -rf "$tmpdir"

share/theme/bw.sh

@@ -0,0 +1,117 @@
+# Simple black-and-white theme
+
+# Pointers
+# ========
+# Sign that indicates the existence of audio files
+FORMAT_LOCAL="|>"
+# Pointer to the track currently playing (playlist)
+FORMAT_CURRENT="->"
+
+# Input prompt
+# =============
+# Search prompt
+SEARCH_PROMPT="search> "
+
+# Headers
+# =======
+# Header that displays artist's name
+HEADER_ARTIST="%s > "
+# Header that displays the release-group name after artist's
+HEADER_ARTIST_RELEASEGROUP="%s > %s > "
+# Header that in addition to `HEADER_ARTIST_RELEASEGROUP` also shows some
+# release information
+HEADER_RELEASE="%s > %s > %s"
+# The release information is formatted as follows (placeholders implicit):
+HEADER_RELEASE_FORMAT="<<tracks>> tx <<media>> | <<label>> <<country>> <<year>>"
+
+# Artist view
+# ===========
+# Artist string for persons
+AV_PERSON="<<name>>"
+# Artist string for groups
+AV_GROUP="<<name>>"
+# Artist disambiguation string
+AV_DISAMBIGUATION=" (<<disambiguation>>)"
+
+# Release-group view
+# ==================
+# Default release group string
+RGV_RELEASE="<<title>>"
+# Release group string if the artist name differs from the current artist
+RGV_RELEASE_W_ARTIST="<<title>> by <<artist>>"
+# Year of the release group
+RGV_YEAR="[<<year>>]"
+
+# Release-group types
+# ===================
+# Album
+FORMAT_TYPE_ALBUM="[LP]"
+# EP
+FORMAT_TYPE_EP="[EP]"
+# Single
+FORMAT_TYPE_SINGLE="[single]"
+# Broadcast
+FORMAT_TYPE_BROADCAST="[broadcast]"
+# Other
+FORMAT_TYPE_OTHER="[other]"
+# Flag to indicate that the given release group has associated secondary types.
+FORMAT_TYPE_HAS_SECONDARY="%s xx"
+# Style to represent secondary types (takes one %s placeholder)
+FORMAT_TYPE_SECONDARY="(%s)"
+# Secondary types
+FORMAT_TYPE_SECONDARY_COMPILATION="compilation"
+FORMAT_TYPE_SECONDARY_SOUNDTRACK="OST"
+FORMAT_TYPE_SECONDARY_SPOKENWORD="spokenword"
+FORMAT_TYPE_SECONDARY_INTERVIEW="interview"
+FORMAT_TYPE_SECONDARY_AUDIOBOOK="book"
+FORMAT_TYPE_SECONDARY_AUDIODRAMA="drama"
+FORMAT_TYPE_SECONDARY_LIVE="live"
+FORMAT_TYPE_SECONDARY_REMIX="remix"
+FORMAT_TYPE_SECONDARY_DJMIX="DJ"
+FORMAT_TYPE_SECONDARY_MIXTAPE="mixtape"
+FORMAT_TYPE_SECONDARY_DEMO="demo"
+FORMAT_TYPE_SECONDARY_FIELDREC="field rec"
+
+# Artist Preview
+# ==============
+# Main preview format. Takes two %s placeholder. The first is for the artist
+# biography. The second for the life span.
+APV_FORMAT="\n\n%s\n\n%s"
+# Specification of a date
+APV_DATE="%s"
+# Specification of a place
+APV_PLACE="%s"
+# Specification of a date and a place (in that order)
+APV_DATEPLACE="%s in %s"
+# String to represent when/where a person is born
+APV_BORN="Born: %s"
+# String to represent when/where a person died
+APV_DIED="Died: %s"
+
+# Release view
+# ============
+# Format of a string that represents a release.
+RV_FORMAT="<<status>>\t<<tracks>> tracks\t<<media>>\t<<year>>\t<<country>>\t<<label>>"
+# Additional string to display the release title and artist name
+RV_TITLE_ARTIST="<<artist>> - <<title>>"
+# Additional string to display the release title
+RV_TITLE="<<title>>"
+# Additional string to display the artist
+RV_ARTIST="<<artist>>"
+
+# Release Status
+# ==============
+FORMAT_STATUS_OFFICIAL="official"
+FORMAT_STATUS_PROMO="promo"
+FORMAT_STATUS_BOOTLEG="bootleg"
+FORMAT_STATUS_PSEUDO="psuedo"
+FORMAT_STATUS_WITHDRAWN="withdrawn"
+FORMAT_STATUS_EXPUNGED="expunged"
+FORMAT_STATUS_CANCELLED="cancelled"
+
+# Recording view
+# ==============
+# Format of a track in a release
+REC_FORMAT="<<med>>\t<<nr>>\t<<title>>\t<<artist>>\t<<duration>>"
+# Format of a track in the playlist
+REC_FORMAT_NO_NUMBER="<<title>>\t<<artist>>\t<<duration>>"

share/theme/simple.sh

@@ -0,0 +1,118 @@
+# Simple theme without emojis
+
+# Colors (internal only)
+ESC=$(printf '\033')
+RED="${ESC}[31m"
+GREEN="${ESC}[32m"
+YELLOW="${ESC}[33m"
+BLUE="${ESC}[34m"
+PURPLE="${ESC}[35m"
+CYAN="${ESC}[36m"
+WHITE="${ESC}[37m"
+OFF="${ESC}[m"
+
+# Pointers
+# ========
+# Sign that indicates the existence of audio files
+FORMAT_LOCAL="${BLUE}|>$OFF"
+# Pointer to the track currently playing (playlist)
+FORMAT_CURRENT="${WHITE}-->$OFF"
+
+# Input prompt
+# =============
+# Search prompt
+SEARCH_PROMPT="search: "
+
+# Headers
+# =======
+# Header that displays artist's name
+HEADER_ARTIST="artist: %s"
+# Header that displays the release-group name after artist's
+HEADER_ARTIST_RELEASEGROUP="artist: %s / album: %s"
+# Header that in addition to `HEADER_ARTIST_RELEASEGROUP` also shows some
+# release information
+HEADER_RELEASE="artist: %s / album: %s (%s)"
+# The release information is formatted as follows (placeholders implicit):
+HEADER_RELEASE_FORMAT="<<label>> <<year>>"
+
+# Artist view
+# ===========
+# Artist string for persons
+AV_PERSON="(P) ${CYAN}<<name>>$OFF"
+# Artist string for groups
+AV_GROUP="(G) ${CYAN}<<name>>$OFF"
+# Artist disambiguation string
+AV_DISAMBIGUATION="// <<disambiguation>>"
+
+# Release-group view
+# ==================
+# Default release group string
+RGV_RELEASE="${PURPLE}<<title>>$OFF"
+# Release group string if the artist name differs from the current artist
+RGV_RELEASE_W_ARTIST="${PURPLE}<<title>>$OFF by ${CYAN}<<artist>>$OFF"
+# Year of the release group
+RGV_YEAR="[<<year>>]"
+
+# Release-group types
+# ===================
+# Album
+FORMAT_TYPE_ALBUM="${YELLOW}LP$OFF"
+# EP
+FORMAT_TYPE_EP="${YELLOW}EP$OFF"
+# Single
+FORMAT_TYPE_SINGLE="${YELLOW}Single$OFF"
+# Broadcast
+FORMAT_TYPE_BROADCAST="${YELLOW}Broadcast$OFF"
+# Other
+FORMAT_TYPE_OTHER=""
+# Flag to indicate that the given release group has associated secondary types.
+FORMAT_TYPE_HAS_SECONDARY="%s ${RED}xx${OFF}"
+# Style to represent secondary types (takes one %s placeholder)
+FORMAT_TYPE_SECONDARY="${RED}(${OFF}%s${RED})${OFF}"
+# Secondary types
+FORMAT_TYPE_SECONDARY_COMPILATION="${YELLOW}compilation$OFF"
+FORMAT_TYPE_SECONDARY_SOUNDTRACK="${YELLOW}soundtrack$OFF"
+FORMAT_TYPE_SECONDARY_SPOKENWORD="${YELLOW}spokenword$OFF"
+FORMAT_TYPE_SECONDARY_INTERVIEW="${YELLOW}interview$OFF"
+FORMAT_TYPE_SECONDARY_AUDIOBOOK="${YELLOW}audiobook$OFF"
+FORMAT_TYPE_SECONDARY_AUDIODRAMA="${YELLOW}audio drama$OFF"
+FORMAT_TYPE_SECONDARY_LIVE="${YELLOW}live$OFF"
+FORMAT_TYPE_SECONDARY_REMIX="${YELLOW}remix$OFF"
+FORMAT_TYPE_SECONDARY_DJMIX="${YELLOW}DJ-mix$OFF"
+FORMAT_TYPE_SECONDARY_MIXTAPE="${YELLOW}mixtape$OFF"
+FORMAT_TYPE_SECONDARY_DEMO="${YELLOW}demo$OFF"
+FORMAT_TYPE_SECONDARY_FIELDREC="${YELLOW}field recording$OFF"
+
+# Artist Preview
+# ==============
+# Main preview format. Takes two %s placeholder. The first is for the artist
+# biography. The second for the life span.
+APV_FORMAT="\n\nBio:\n%s\n\n${WHITE}%s${OFF}"
+# Specification of a date
+APV_DATE="%s"
+# Specification of a place
+APV_PLACE="%s"
+# Specification of a date and a place (in that order)
+APV_DATEPLACE="%s in %s"
+# String to represent when/where a person is born
+APV_BORN="Born: %s"
+# String to represent when/where a person died
+APV_DIED="Died: %s"
+
+# Release view
+# ============
+# Format of a string that represents a release.
+RV_FORMAT="<<media>> (<<tracks>>, yr: <<year>>)\t<<label>>"
+# Additional string to display the release title and artist name
+RV_TITLE_ARTIST="${CYAN}<<artist>>$OFF - ${PURPLE}<<title>>$OFF"
+# Additional string to display the release title
+RV_TITLE="${PURPLE}<<title>>$OFF"
+# Additional string to display the artist
+RV_ARTIST="${CYAN}<<artist>>$OFF"
+
+# Recording view
+# ==============
+# Format of a track in a release
+REC_FORMAT="<<med>>\t${RED}<<nr>>$OFF\t${GREEN}<<title>>$OFF\t${CYAN}<<artist>>$OFF\t${WHITE}<<duration>>$OFF"
+# Format of a track in the playlist
+REC_FORMAT_NO_NUMBER="${GREEN}<<title>>$OFF\t${CYAN}<<artist>>$OFF\t${WHITE}<<duration>>$OFF"

src/awk/artists.awk

@@ -1,3 +1,30 @@
+# List artists
+#
+# parameter file_local_artists:    This is an optional parameter with the path
+#                                  to a file with a MusicBrainz artist ID per
+#                                  line.
+# parameter format_person:         This is the format string for single person
+#                                  artists, which includes the <<name>>
+#                                  placeholder.
+# parameter format_disambiguation: This is the format string for the
+#                                  disambiguation part of the artist, with a
+#                                  placeholder <<disambiguation>>.
+# parameter format_group:          This is as format_person, but for music
+#                                  groups.
+# parameter format_local:          String to indicate that there is some music
+#                                  locally available of an artist
+#
+# This awk program takes as input a sequence of lines where the first item is
+# the MusicBrainz artist ID, the second item is the type of the artist
+# ("Person" or "Group"), the third item is the name, and the forth item is a
+# disambiguation string.
+#
+# The output of this script is a sequence of tab-delimited lines where the
+# first item is the format_local string, if some music of that artist is
+# locally accessible, and the empty string otherwise, the second item is the
+# formatted artist string (formatted according to format_person or
+# format_group), the third item is the constant string "0" indicating the
+# parent MusicBrainz ID, and the last item is the MusicBrainz artist ID.
 BEGIN {
   OFS="\t"
   local_artists[0] = 0
@@ -16,5 +43,5 @@ BEGIN {
     name = name " " format_disambiguation
   sub("<<disambiguation>>", $4, name)
   sub("<<name>>", $3, name)
-  print l, name, $1
+  print l, name, "0", $1
 }

src/awk/recordings.awk

@@ -1,21 +1,60 @@
+# List recordings
+#
+# parameter file_local_recordings: This is an optional parameter with the path
+#                                  to a file with a MusicBrainz recording ID
+#                                  per line.
+# parameter format:                The format of a recording line including the
+#                                  placeholders <<med>> for medium number,
+#                                  <<nr> for for track number within a medium,
+#                                  <<title>> for the title, <<artist>> for the
+#                                  artist string, and <<duration>> for the
+#                                  track duration.
+# parameter format_local:          String to indicate that the track is locally
+#                                  available
+# parameter format_current:        String to indicate that the track is
+#                                  "currently playing"
+# parameter current_id:            MusicBrainz track ID of a track to be marked
+#                                  as "currently playing"
+#
+# The input to this awk program is a sequence of lines containing the following fields:
+# Field 1: The MusicBrainz ID of the release this track belongs to
+# Field 2: MusicBrainz ID of this track
+# Field 3: Medium number of this track within the release
+# Field 4: Track number of this track within the medium
+# Field 5: Duration of this track in miliseconds
+# Field 6: Title of this track
+# Field 7: Artist of this track
+# Field 8: Path to decoratoin file of this release
+#
+# The output is a sequence of tab-delimited lines containing the following fields:
+# Field 1: Sort value (to sort the track within the release)
+# Field 2: The string `format_local` if the track is locally available
+# Field 3: The string `format_current` if the track has MusicBrainz ID `current_id`
+# Field 4: The track line to be displayed according to `format`
+# Field 5: The MusicBrainz ID of the release this track belongs to
+# Field 6: The MusicBrainz ID of this track ":" separated from the path to the
+#          decoration file of this release
 BEGIN {
   OFS="\t"
   local_recordings[0] = 0
   delete local_recordings[0]
   if (file_local_recordings) {
     while ((getline < file_local_recordings) == 1)
-      local_recordings[$1] = $2
+      local_recordings[$1] = 1
     close(file_local_recordings)
   }
 }
 {
-  gsub("&", "\\\\&")
+  parentid = $1
-  id = $1
+  id = $2
-  med = $2
+  med = $3
-  nr = $3
+  nr = $4
-  dur = $4
+  dur = $5
-  title = $5
+  title = $6
-  artist = $6
+  artist = $7
+  deco = local_recordings[id] ? $8 : ""
+  gsub("&", "\\\\&", title)
+  gsub("&", "\\\\&", artist)
   # Parse duration
   if (dur) {
     dur = int(dur / 1000)
@@ -36,6 +75,7 @@ BEGIN {
   sub("<<artist>>", artist, line)
   sub("<<duration>>", dur, line)
   l = local_recordings[id] ? format_local : ""
+  c = id == current_id ? format_current : ""
   sortk = med" "nr
-  print sortk, l, line, id ":" local_recordings[id]
+  print sortk, l, c, line, parentid, id ":" deco
 }

src/awk/releasegroups.awk

@@ -1,3 +1,69 @@
+# List release groups
+#
+# parameter file_local_releasegroups: This is an optional parameter with the
+#                                     path to a file with a MusicBrainz
+#                                     release-group ID per line.
+# parameter format_release:           Format for the release title with a
+#                                     <<title>> placeholder.
+# parameter format_release_w_artist:  Same as `format_release` but with an
+#                                     additional <<artist>> placeholder.
+# parameter format_year:              Format string for the year part, with a
+#                                     <<year>> placeholder.
+# parameter format_local:             String to indicate that the track is
+#                                     locally available.
+# parameter artist:                   Artist name to compare release-groups
+#                                     artist names against. If the names
+#                                     differ, then the format with <<artist>>
+#                                     placeholder is used (optional)
+# parameter artistid                  MusicBrainz ID of the artist (optional).
+# Then, there are several format strings that indicate the type of a release
+# group. The types are implicit from the parameter names:
+# parameter format_album
+# parameter format_single
+# parameter format_ep
+# parameter format_broadcast
+# parameter format_other
+# Some release groups have also a secondary type. The presence of a secondary
+# type is formatted using
+# parameter format_secondary.
+# The list of all secondary types (implicit from their variable names) are
+# formatted using
+# parameter format_secondary.
+# Each of the secondary types is specified with (the type is implicit from the
+# variable names)
+# parameter format_compilation
+# parameter format_soundtrack
+# parameter format_spokenword
+# parameter format_interview
+# parameter format_audiobook
+# parameter format_audiodrama
+# parameter format_live
+# parameter format_remix
+# parameter format_djmix
+# parameter format_mixtape
+# parameter format_demo
+# parameter format_fieldrec
+#
+# The input to this awk program is a sequence of lines containing the following
+# fields:
+# Field 1: The MusicBrainz ID of the release group
+# Field 2: The primary type
+# Field 3: A ;-delimited string of secondary types
+# Field 4: The original release year
+# Field 5: Title of the release group
+# Field 6: The artist as credited
+#
+# The output is a sequence of tab-delimited lines with the fields:
+# Field 1: Sort value to sort release groups
+# Field 2: The flag `format_local` if the release group is accessible locally,
+#          and "" else.
+# Field 3: Release-group type
+# Field 4: Release-group string
+# Field 5: Release-group year
+# Field 6: Secondary types
+# Field 7: MusicBrainz artist ID of the release group artist, if there is one,
+#          else "0"
+# Field 8: MusicBrainz release-group ID
 BEGIN {
   OFS="\t"
   local_releasegroups[0] = 0
@@ -58,5 +124,5 @@ BEGIN {
   line_year = year ? format_year : ""
   sub("<<year>>", year, line_year)
   sortk = year ? year : 0
-  print sortk, l, line_type, line_release, line_year, line_sectype, id
+  print sortk, l, line_type, line_release, line_year, line_sectype, artistid ? artistid : "0", id
 }

src/awk/releases.awk

@@ -1,3 +1,57 @@
+# List releases
+#
+# parameter file_local_releases:         This is an optional parameter with the
+#                                        path to a file with a MusicBrainz
+#                                        release ID per line.
+# parameter format_release:              Format for the release with the
+#                                        placeholders <<status>>, <<tracks>>,
+#                                        <<media>>, <<year>>, <<country>>, and
+#                                        <<label>>.
+# parameter format_release_title_artist: Format to specify title and artist,
+#                                        with the placeholders <<title>> and
+#                                        <<artist>>.
+# parameter format_release_title:        Format to specify the release title
+#                                        with a placeholder <<title>>.
+# parameter format_release_artist:       Format to specify the release artist
+#                                        with a placeholder <<artist>>.
+# parameter format_local:                String to indicate that the track is
+#                                        locally available.
+# parameter rg_artist:                   Artist name of release group
+#                                        (optional)
+# parameter rg_title:                    Title of release group (optional)
+# parameter rgid:                        MusicBrainz release-group ID
+#                                        (optional)
+# Then, there are several format strings that indicate the status of a release.
+# The status are implicit from the parameter names:
+# parameter release_official
+# parameter release_promotion
+# parameter release_bootleg
+# parameter release_pseudo
+# parameter release_withdrawn
+# parameter release_expunged
+# parameter release_cancelled
+#
+# The input to this awk program is a sequence of lines containing the following
+# fields:
+# Field  1: MusicBrainz ID of the release
+# Field  2: Release status
+# Field  3: Release date
+# Field  4: Number of cover-art images
+# Field  5: Label string (', '-delimited)
+# Field  6: Total number of tracks
+# Field  7: Format (', '-delimited)
+# Field  8: Release country
+# Field  9: Release title
+# Field 10: Artist as credited
+#
+# The output is a sequence of tab-delimited lines with the fields:
+# Field 1: Sort value to sort release groups
+# Field 2: The flag `format_local` if the release is accessible locally, and ""
+#          else.
+# Field 3: Release line
+# Field 4: MusicBrainz release-group ID if present, else "0"
+# Field 5: MusicBrainz release ID followed by ":" and then a path to the
+#          decoration file (if it exists)
 BEGIN {
   OFS="\t"
   local_releases[0] = 0
@@ -30,28 +84,28 @@ BEGIN {
     case "Cancelled": line_status = release_cancelled; break
     default: line_status = ""
   }
-  line = release_format
+  line = format_release
   if (artist != rg_artist && title != rg_title)
-    line = line "\t" release_format_title_artist
+    line = line "\t" format_release_title_artist
   else if (artist != rg_artist && title == rg_title)
-    line = line "\t" release_format_artist
+    line = line "\t" format_release_artist
   else if (artist == rg_artist && title != rg_title)
-    line = line "\t" release_format_title
+    line = line "\t" format_release_title
   else
     line = line "\t"
 
-  sub("<<status>>", line_status, line)
+  gsub("<<status>>", line_status, line)
-  sub("<<year>>", year, line)
+  gsub("<<year>>", year, line)
-  sub("<<tracks>>", trackcnt, line)
+  gsub("<<tracks>>", trackcnt, line)
-  sub("<<media>>", media, line)
+  gsub("<<media>>", media, line)
   gsub("&", "\\\\&", label)
-  sub("<<label>>", label, line)
+  gsub("<<label>>", label, line)
-  gsub("&", "\\\\&", titel)
+  gsub("&", "\\\\&", title)
-  sub("<<title>>", title, line)
+  gsub("<<title>>", title, line)
   gsub("&", "\\\\&", artist)
-  sub("<<artist>>", artist, line)
+  gsub("<<artist>>", artist, line)
-  sub("<<country>>", country, line)
+  gsub("<<country>>", country, line)
   sortk = year ? year : 0
   l = local_releases[id] ? format_local : ""
-  print sortk, l, line, id ":" local_releases[id]
+  print sortk, l, line, rgid ? rgid : "0", id ":" local_releases[id]
 }

src/sh/api.sh

@@ -1,82 +1,30 @@
+# This file provides the methods for access to several APIs
+#
+# APIs:
+# - MusicBrainz
+# - Discogs
+# - Wikidata
+# - Wikipedia
+if [ ! "${API_LOADED:-}" ]; then
   MB_MAX_RETRIES=10
   MB_BROWSE_STEPS=100
   USER_AGENT="$APP_NAME/$APP_VERSION ($APP_WEBSITE)"
   SLEEP_ON_ERROR=1
-export MB_BROWSE_STEPS
+  export MB_MAX_RETRIES MB_BROWSE_STEPS USER_AGENT SLEEP_ON_ERROR
 
-__mpv_command() {
+  export API_LOADED=1
-  echo "mpv_command: $*" >>/tmp/foo
+fi
-  printf "{ \"command\": [\"%s\"] }\n" "$1" | $SOCAT - "$MPV_SOCKET"
-}
-
-__mpv_command_with_arg() {
-  echo "mpv_command_1: $*" >>/tmp/foo
-  printf "{ \"command\": [\"%s\", \"%s\"] }\n" "$1" "$2" | $SOCAT - "$MPV_SOCKET"
-}
-
-__mpv_command_with_args2() {
-  echo "mpv_command_2: $*" >>/tmp/foo
-  printf "{ \"command\": [\"%s\", \"%s\", \"%s\"] }\n" "$1" "$2" "$3" | $SOCAT - "$MPV_SOCKET"
-}
-
-__mpv_get() {
-  __mpv_command_with_arg "expand-text" "$2" | $JQ -r '.data'
-}
-
-mpv_playlist_count() {
-  __mpv_get '${playlist/count}'
-}
-
-mpv_playlist_position() {
-  __mpv_get '${playlist-pos}'
-}
-
-mpv_quit() {
-  __mpv_command "quit"
-}
-
-mpv_start() {
-  MPV_SOCKET="$(mktemp --suffix=.sock)"
-  trap 'mpv_quit; rm -f "$MPV_SOCKET"' EXIT INT
-  $MPV --no-config --no-terminal --input-ipc-server="$MPV_SOCKET" --idle --no-osc --no-input-default-bindings &
-}
-
-mpv_play_file() {
-  __mpv_command_with_arg "loadfile" "$1"
-}
-
-mpv_queue_file() {
-  __mpv_command_with_args2 "loadfile" "$1" "append-play"
-}
-
-mpv_play_list() {
-  __mpv_command_with_arg "loadlist" "$1"
-}
-
-mpv_queue_list() {
-  __mpv_command_with_arg "loadlist" "$1" "append-play"
-}
-
-mpv_next() {
-  __mpv_command "playlist-next"
-}
-
-mpv_prev() {
-  __mpv_command "playlist-prev"
-}
-
-mpv_seek_forward() {
-  __mpv_command_with_arg "seek" "10"
-}
-
-mpv_seek_backward() {
-  __mpv_command_with_arg "seek" "-10"
-}
-
-mpv_toggle_pause() {
-  __mpv_command_with_arg "cycle" "pause"
-}
 
+# Internal method for MusicBrainz API access
+#
+# @argument $1: entity (see `case` below)
+# @argument $2: MusicBrainz ID
+# @argument $3: offset (optional, but mandatory for browse requests)
+#
+# If the API access fails, then the error message is logged, and at most
+# `MB_MAX_RETRIES` retries are made. If browse requests are made, then at most
+# `MB_BROWSE_STEPS` number of entries are requested per call. The offset in
+# browse request must be specified.
 __api_mb() {
   tmpout=$(mktemp)
   for _ in $(seq "$MB_MAX_RETRIES"); do
@@ -152,48 +100,79 @@ __api_mb() {
         "https://musicbrainz.org/ws/2/release-group"
       ;;
     esac
-    if ! $JQ -e '.error' "$tmpout" >/dev/null 2>/dev/stdout; then
+    errormsg=$($JQ -e '.error // ""' "$tmpout")
+    if [ "$errormsg" ]; then
+      err "Failed to fetch MusicBrainz data for $1 $2: $errormsg"
+      echo "$errormsg" | grep -q -i "not found" && break
+      echo "$errormsg" | grep -q -i "invalid" && break
+      sleep "$SLEEP_ON_ERROR"
+    else
       cat "$tmpout"
       rm -f "$tmpout"
       return 0
-    else
-      sleep "$SLEEP_ON_ERROR"
     fi
   done
   rm -f "$tmpout"
-  err "Failed to fetch MusicBrainz data for $1 $2"
+  err "Failed to fetch MusicBrainz data for $1 $2 (not retrying anymore...)"
   return 1
 }
 
+# The interface to MusicBrainz API.
+
+# Retrieve MusicBrainz artist information
+#
+# @argument $1: MusicBrainz artist ID
 api_mb_artist() {
   __api_mb "artist" "$1"
 }
 
+# Retrieve MusicBrainz release-group information
+#
+# @argument $1: MusicBrainz release-group ID
 api_mb_releasegroup() {
   __api_mb "releasegroup" "$1"
 }
 
+# Retrieve MusicBrainz release information
+#
+# @argument $1: MusicBrainz release ID
 api_mb_release() {
   __api_mb "release" "$1"
 }
 
+# Retrieve MusicBrainz release-groups for given artist
+#
+# @argument $1: MusicBrainz artist ID
+# @argument $2: offset (defaults to 0)
 api_mb_browse_artist_releasegroups() {
   __api_mb "browse-artist-releasegroups" "$1" "${2:-0}"
 }
 
+# Retrieve MusicBrainz releases in given release group
+#
+# @argument $1: MusicBrainz release-group ID
+# @argument $2: offset (defaults to 0)
 api_mb_browse_releasegroup_releases() {
   __api_mb "browse-releasegroup-releases" "$1" "${2:-0}"
 }
 
-# Argument: Search string
+# Search MusicBrainz database for given artist
+#
+# @argument $1: query
 api_mb_search_artist() {
   __api_mb "search-artist" "$1"
 }
 
+# Search MusicBrainz database for given release group
+#
+# @argument $1: query
 api_mb_search_releasegroup() {
   __api_mb "search-releasegroup" "$1"
 }
 
+# Retrieve Discogs artist information
+#
+# @argument $1: Discogs artist ID
 api_discogs_artist() {
   $CURL \
     --get \
@@ -201,6 +180,9 @@ api_discogs_artist() {
     "https://api.discogs.com/artists/$1"
 }
 
+# Retrieve sitelinks from wikidata
+#
+# @argument $1: Wikidata ID
 api_wikidata_sitelinks() {
   $CURL \
     --get \
@@ -208,6 +190,9 @@ api_wikidata_sitelinks() {
     "https://www.wikidata.org/w/rest.php/wikibase/v1/entities/items/$1/sitelinks"
 }
 
+# Retrieve summary from Wikipedia page
+#
+# @argument $1: Wikipedia page name
 api_wikipedia_en_summary() {
   $CURL \
     --get \

src/sh/awk.sh

@@ -1,3 +1,6 @@
+# The code below is used together with `scripts/build.sh`to internalize the awk
+# scripts. See the awk sources for more information.
+if [ ! "${AWK_LOADED:-}" ]; then
   AWK_ARTISTS=$(
     cat <<'EOF'
 @@include awk/artists.awk
@@ -25,3 +28,6 @@ AWK_RECORDINGS=$(
 EOF
   )
   export AWK_RECORDINGS
+
+  export AWK_LOADED=1
+fi

src/sh/cache.sh

@@ -1,31 +1,59 @@
-# Caching structure
+# This implements the caching functionalities. The cache is stored under
-#
+# `CACHEDIR` defined below, and organized as follows (all paths relative to
-# ./artist/radix(uuid)/musicbrainz.json         # Artist information
+# `CAHCEDIR`) ./<type>/radix(mbid)/<file>. Here, type is one of `TYPE_ARTIST`,
-# ./artist/radix(uuid)/releasegroups.json       # List of all release groups
+# `TYPE_RELEASEGROUP`, or `TYPE_RELEASE`. The string `radix(mbid)` is the radix
-# ./artist/radix(uuid)/...                      # Any other artist information
+# encoded MusicBrainz ID of given type (see method below). Finally <file> is a
-# ./releasegroup/radix(uuid)/musicbrainz.json   # Release group information
+# filename to hold the respective data in the json format. Currently, the data
-# ./releasegroup/radix(uuid)/releases.json      # List of all releases in release group
+# is stored as follows:
-# ./release/radix(uuid)/musicbrainz.json        # Release information with tracklist etc.
+# ./artist/radix(mbid)/musicbrainz.json         MusicBrainz artist data
+# ./artist/radix(mbid)/discogs.json             Discogs artist data
+# ./artist/radix(mbid)/wikidata.json            Wikidata artist data
+# ./artist/radix(mbid)/enwikipedia.json         Wikipedia artist data
+# ./artist/radix(mbid)/releasegroups.json       Release groups of artist
+# ./releasegroup/radix(mbid)/musicbrainz.json   MusicBrainz release-group data
+# ./releasegroup/radix(mbid)/releases.json      Releases in release group
+# ./release/radix(mbid)/musicbrainz.json        MusicBrainz release data
+
+if [ ! "${CACHE_LOADED:-}" ]; then
+  # Base path for cache
   CACHEDIR="$HOME/.cache/$APP_NAME"
+  # Directory names for cache types
   TYPE_ARTIST="artist"
   TYPE_RELEASEGROUP="releasegroup"
   TYPE_RELEASE="release"
+  # Filenames for cache entries
+  ARTIST_FILENAME="musicbrainz.json"
+  ARTIST_RELEASEROUPS_FILENAME="releasegroups.json"
+  ARTIST_DISCOGS_FILENAME="discogs.json"
+  ARTIST_WIKIDATA_FILENAME="wikidata.json"
+  ARTIST_ENWIKIPEDIA_FILENAME="enwikipedia.json"
+  RELEASEGROUP_FILENAME="musicbrainz.json"
+  RELEASEGROUP_RELEASES_FILENAME="releases.json"
+  RELEASE_FILENAME="musicbrainz.json"
+  export CACHEDIR TYPE_ARTIST TYPE_RELEASEGROUP TYPE_RELEASE ARTIST_FILENAME \
+    ARTIST_RELEASEROUPS_FILENAME ARTIST_DISCOGS_FILENAME \
+    ARTIST_WIKIDATA_FILENAME ARTIST_ENWIKIPEDIA_FILENAME \
+    RELEASEGROUP_FILENAME RELEASEGROUP_RELEASES_FILENAME RELEASE_FILENAME
 
-artist_filename="musicbrainz.json"
+  export CACHE_LOADED=1
-artist_releasegroups_filename="releasegroups.json"
+fi
-artist_discogs_filename="discogs.json"
-artist_wikidata_filename="wikidata.json"
-artist_enwikipedia_filename="enwikipedia.json"
-releasegroup_filename="musicbrainz.json"
-releasegroup_releases_filename="releases.json"
-release_filename="musicbrainz.json"
 
-# Radix transform directory name
+# Radix transform string
+#
+# @argument $1: some string
 __radix() {
   echo "$1" | awk -F "" '{ print $1$2$3$4"/"$5$6$7$8"/"$0 }'
 }
 
-# Super wrapper
+# Radix transform strings (batch)
+#
+# Here, the input is read line-by-line from stdin.
+__radix_batch() {
+  cat | awk -F "" '{ print $1$2$3$4"/"$5$6$7$8"/"$0 }'
+}
+
+# Super wrapper to print json data from cache
+#
 # argument $1: type
 # argument $2: MusicBrainz ID
 # argument $3: Filename of json file
@@ -35,7 +63,8 @@ __get_json() {
   cat "$f"
 }
 
-# Super wrapper
+# Super wrapper to store json data in cache
+#
 # argument $1: type
 # argument $2: MusicBrainz ID
 # argument $3: Filename of json file
@@ -48,114 +77,221 @@ __put_json() {
   [ -s "$tmpf" ] && mv "$tmpf" "$f" || printf "{}" >"$f"
 }
 
-## Artist
+# Print MusicBrainz data of given artist from cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_get_artist() {
-  __get_json "$TYPE_ARTIST" "$1" "$artist_filename"
+  __get_json "$TYPE_ARTIST" "$1" "$ARTIST_FILENAME"
 }
 
+# Print release groups (MusicBrainz) of given artist from cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_get_artist_releasegroups() {
-  __get_json "$TYPE_ARTIST" "$1" "$artist_releasegroups_filename"
+  __get_json "$TYPE_ARTIST" "$1" "$ARTIST_RELEASEROUPS_FILENAME"
 }
 
+# Print Discogs data of given artist from cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_get_artist_discogs() {
-  __get_json "$TYPE_ARTIST" "$1" "$artist_discogs_filename"
+  __get_json "$TYPE_ARTIST" "$1" "$ARTIST_DISCOGS_FILENAME"
 }
 
+# Print Wikipedia data of given artist from cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_get_artist_enwikipedia() {
-  __get_json "$TYPE_ARTIST" "$1" "$artist_enwikipedia_filename"
+  __get_json "$TYPE_ARTIST" "$1" "$ARTIST_ENWIKIPEDIA_FILENAME"
 }
 
+# Print Wikidata data of given artist from cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_get_artist_wikidata() {
-  __get_json "$TYPE_ARTIST" "$1" "$artist_wikidata_filename"
+  __get_json "$TYPE_ARTIST" "$1" "$ARTIST_WIKIDATA_FILENAME"
 }
 
+# Store MusicBrainz data of given artist in cache
+#
+# @argument $1: MusicBrainz artist ID
+#
+# This methods reads the data to be stored from stdin.
 cache_put_artist() {
-  cat | __put_json "$TYPE_ARTIST" "$1" "$artist_filename"
+  cat | __put_json "$TYPE_ARTIST" "$1" "$ARTIST_FILENAME"
 }
 
+# Store release groups (MusicBrainz) of given artist in cache
+#
+# @argument $1: MusicBrainz artist ID
+#
+# This methods reads the data to be stored from stdin.
 cache_put_artist_releasegroups() {
-  cat | __put_json "$TYPE_ARTIST" "$1" "$artist_releasegroups_filename"
+  cat | __put_json "$TYPE_ARTIST" "$1" "$ARTIST_RELEASEROUPS_FILENAME"
 }
 
+# Append release groups (MusicBrainz) of given artist to existing file in cache
+#
+# @argument $1: MusicBrainz artist ID
+#
+# This methods reads the data to be stored from stdin.
 cache_append_artist_releasegroups() {
   tmpf=$(mktemp)
   cat >"$tmpf"
   updated=$(mktemp)
-  f="$CACHEDIR/$TYPE_ARTIST/$(__radix "$1")/$artist_releasegroups_filename"
+  f="$CACHEDIR/$TYPE_ARTIST/$(__radix "$1")/$ARTIST_RELEASEROUPS_FILENAME"
-  $JQ -r --slurpfile n "$tmpf" '."release-groups" += ($n[0]|."release-groups")' "$f" >"$updated" && mv "$updated" "$f"
+  $JQ --slurpfile n "$tmpf" '."release-groups" += ($n[0]|."release-groups")' "$f" >"$updated" && mv "$updated" "$f"
   rm -f "$tmpf"
 }
 
+# Store Discogs data of given artist to cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_put_artist_discogs() {
-  cat | __put_json "$TYPE_ARTIST" "$1" "$artist_discogs_filename"
+  cat | __put_json "$TYPE_ARTIST" "$1" "$ARTIST_DISCOGS_FILENAME"
 }
 
+# Store Wikipedia data of given artist to cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_put_artist_enwikipedia() {
-  cat | __put_json "$TYPE_ARTIST" "$1" "$artist_enwikipedia_filename"
+  cat | __put_json "$TYPE_ARTIST" "$1" "$ARTIST_ENWIKIPEDIA_FILENAME"
 }
 
+# Store Wikidata data of given artist to cache
+#
+# @argument $1: MusicBrainz artist ID
 cache_put_artist_wikidata() {
-  cat | __put_json "$TYPE_ARTIST" "$1" "$artist_wikidata_filename"
+  cat | __put_json "$TYPE_ARTIST" "$1" "$ARTIST_WIKIDATA_FILENAME"
 }
 
-## Release group
+# Print MusicBrainz data of given release group from cache
+#
+# @argument $1: MusicBrainz release-group ID
 cache_get_releasegroup() {
-  __get_json "$TYPE_RELEASEGROUP" "$1" "$releasegroup_filename"
+  __get_json "$TYPE_RELEASEGROUP" "$1" "$RELEASEGROUP_FILENAME"
 }
 
+# Print releases (MusicBrainz) in release group from cache
+#
+# @argument $1: MusicBrainz release-group ID
 cache_get_releasegroup_releases() {
-  __get_json "$TYPE_RELEASEGROUP" "$1" "$releasegroup_releases_filename"
+  __get_json "$TYPE_RELEASEGROUP" "$1" "$RELEASEGROUP_RELEASES_FILENAME"
 }
 
+# Store MusicBrainz data of given release group in cache
+#
+# @argument $1: MusicBrainz release-group ID
 cache_put_releasegroup() {
-  cat | __put_json "$TYPE_RELEASEGROUP" "$1" "$releasegroup_filename"
+  cat | __put_json "$TYPE_RELEASEGROUP" "$1" "$RELEASEGROUP_FILENAME"
 }
 
+# Store releases (MusicBrainz) of given release group in cache
+#
+# @argument $1: MusicBrainz release-group ID
 cache_put_releasegroup_releases() {
-  cat | __put_json "$TYPE_RELEASEGROUP" "$1" "$releasegroup_releases_filename"
+  cat | __put_json "$TYPE_RELEASEGROUP" "$1" "$RELEASEGROUP_RELEASES_FILENAME"
 }
 
+# Append releases (MusicBrainz) of given release group to existing file in
+# cache
+#
+# @argument $1: MusicBrainz release-group ID
 cache_append_releasegroup_releases() {
   tmpf=$(mktemp)
   cat >"$tmpf"
   updated=$(mktemp)
-  f="$CACHEDIR/$TYPE_RELEASEGROUP/$(__radix "$1")/$releasegroup_releases_filename"
+  f="$CACHEDIR/$TYPE_RELEASEGROUP/$(__radix "$1")/$RELEASEGROUP_RELEASES_FILENAME"
-  $JQ -r --slurpfile n "$tmpf" '."releases" += ($n[0]|."releases")' "$f" >"$updated" && mv "$updated" "$f"
+  $JQ --slurpfile n "$tmpf" '."releases" += ($n[0]|."releases")' "$f" >"$updated" && mv "$updated" "$f"
   rm -f "$tmpf"
 }
 
-## Release
+# Print MusicBrainz data of given release from cache
+#
+# @argument $1: MusicBrainz release ID
 cache_get_release() {
-  __get_json "$TYPE_RELEASE" "$1" "$release_filename"
+  __get_json "$TYPE_RELEASE" "$1" "$RELEASE_FILENAME"
 }
 
+# Store MusicBrainz data of given release in cache
+#
+# @argument $1: MusicBrainz release ID
 cache_put_release() {
-  cat | __put_json "$TYPE_RELEASE" "$1" "$release_filename"
+  cat | __put_json "$TYPE_RELEASE" "$1" "$RELEASE_FILENAME"
 }
 
-## Cache deletion
+# Print all MusicBrainz cache paths to the files specified by their IDs
-cache_delete_artist() {
+#
-  # Get release groups
+# @argument $1: type
-  echo "NOT IMPLEMENTED" >/dev/stderr
+#
-}
+# This method reads from stdin any number of MusicBrainz IDs of objects of the
-
+# specified type, and prints the file paths.
-# Check if main items are in cache
+cache_get_file_batch() {
-# argument $1: type
-# argument $2: MusicBrainz ID
-in_cache() {
   case "$1" in
-  "$TYPE_ARTIST")
+  "$TYPE_ARTIST") fn="$ARTIST_FILENAME" ;;
-    fn="$artist_filename"
+  "$TYPE_RELEASEGROUP") fn="$RELEASEGROUP_FILENAME" ;;
-    ;;
+  "$TYPE_RELEASE") fn="$RELEASE_FILENAME" ;;
-  "$TYPE_RELEASEGROUP")
+  *) return 1 ;;
-    fn="$releasegroup_filename"
-    ;;
-  "$TYPE_RELEASE")
-    fn="$release_filename"
-    ;;
-  *)
-    return 1
-    ;;
   esac
-  [ "$(__get_json "$1" "$2" "$fn")" ] && return 0 || return 1
+  cat |
+    __radix_batch |
+    awk -v dir="$CACHEDIR/$1/" -v f="/$fn" '{ print dir $0 f }'
+}
+
+# Print MusicBrainz ID associated to the file paths
+#
+# This reads from stdin any number of paths (one per line)
+cache_mbid_from_path_batch() {
+  cat | awk -F "/" '{ print $(NF-1) }'
+}
+
+# Remove artist items from cache
+#
+# @argument $1: MusicBrainz arist ID
+#
+# This function is "safer" than other because it removes data. These safty
+# checks are paranoid.
+cache_rm_artist() {
+  [ "$CACHEDIR" ] || return 1
+  [ -d "$CACHEDIR" ] || return 1
+  [ -d "$CACHEDIR/$TYPE_ARTIST" ] || return 1
+  d="$CACHEDIR/$TYPE_ARTIST/$(__radix "$1")/"
+  [ "$d" ] || return 1
+  [ -d "$d" ] || return 1
+  info "removing $d"
+  rm -rf "$d"
+}
+
+# Remove release-group items from cache
+#
+# @argument $1: MusicBrainz release-group ID
+#
+# This function is "safer" than other because it removes data. These safty
+# checks are paranoid.
+cache_rm_releasegroup() {
+  [ "$CACHEDIR" ] || return 1
+  [ -d "$CACHEDIR" ] || return 1
+  [ -d "$CACHEDIR/$TYPE_RELEASEGROUP" ] || return 1
+  d="$CACHEDIR/$TYPE_RELEASEGROUP/$(__radix "$1")/"
+  [ "$d" ] || return 1
+  [ -d "$d" ] || return 1
+  info "removing $d"
+  rm -rf "$d"
+}
+
+# Remove release items from cache
+#
+# @argument $1: MusicBrainz release ID
+#
+# This function is "safer" than other because it removes data. These safty
+# checks are paranoid.
+cache_rm_release() {
+  [ "$CACHEDIR" ] || return 1
+  [ -d "$CACHEDIR" ] || return 1
+  [ -d "$CACHEDIR/$TYPE_RELEASE" ] || return 1
+  d="$CACHEDIR/$TYPE_RELEASE/$(__radix "$1")/"
+  [ "$d" ] || return 1
+  [ -d "$d" ] || return 1
+  info "removing $d"
+  rm -rf "$d"
 }

src/sh/config.sh

@@ -1,4 +1,18 @@
-if [ "${CONFIGFILE:-}" ]; then
+# Main application configuration. This application does not require a
-  [ ! -f "$CONFIGFILE" ] && err "Configuration $CONFIGFILE not found." && exit 1
+# configuration file. However, a configuration file may be stored as
-  . "$CONFIGFLIE"
+# `CONFIGFILE_DEFAULT`. If that file exists, it will be sourced. The path to
-fi
+# the file may be overwritten by specifying the environment variable
+# `CONFIGFILE`. If a configuration file is specified, then it must also exist.
+# A configuration file comprises the specification of environment variables
+# that are` allowed to be set.
+#
+# Currently, the following files hold variables that are configurable:
+# - `src/sh/filter.sh`:  Configuration of filters that can be triggered with
+#                        the respective key bindings.
+# - `src/sh/keys.sh`:    Configuration of key bindings to certain actions
+# - `src/sh/theme.sh`:   Configuration of theme
+CONFIGFILE_DEFAULT="$HOME/.config/$APP_NAME/config"
+CONFIGFILE="${CONFIGFILE:-"$CONFIGFILE_DEFAULT"}"
+[ "$CONFIGFILE" != "$CONFIGFILE_DEFAULT" ] && [ ! -f "$CONFIGFILE" ] && err "The configuration file manually specified with the environment variable CONFIGFILE=($CONFIGFILE) does not exist." && exit 1
+# shellcheck source=/dev/null
+[ -f "$CONFIGFILE" ] && . "$CONFIGFILE"

src/sh/filter.sh

@@ -0,0 +1,87 @@
+# Preset filters for different views. These filters are associated to key
+# bindings (see `src/sh/keys.sh`), and are configurable through a configuration
+# file (see `src/sh/config.sh`).
+
+# The `QUERY_LOCAL` filter is associated with the keys `KEYS_FILTER_LOCAL`. It
+# is used to hide all entries that are not available locally (see
+# `src/sh/query.sh` for details and the relevant methods)
+QUERY_LOCAL="${QUERY_LOCAL:-"$(printf "'%s'" "$FORMAT_LOCAL" | __clean_filter)"}"
+
+# The following variables store preset strings derived from the theme (see
+# `src/sh/theme.sh`), and used in the assignment of the default filters.
+q_has_seconary="$(printf "$FORMAT_TYPE_HAS_SECONDARY" "" | __clean_filter)"
+q_album="$(printf "%s" "$FORMAT_TYPE_ALBUM" | __clean_filter)"
+q_ep=$(printf "%s" "$FORMAT_TYPE_EP" | sed "s/${ESC}\[[0-9;]*[mK]//g" | sed "s/ /\\\ /g")
+q_single=$(printf "%s" "$FORMAT_TYPE_SINGLE" | sed "s/${ESC}\[[0-9;]*[mK]//g" | sed "s/ /\\\ /g")
+if printf "$RV_FORMAT" | grep -q "<<status>>"; then
+  q_official=$(printf "'%s'" "$FORMAT_STATUS_OFFICIAL" | sed "s/${ESC}\[[0-9;]*[mK]//g" | sed "s/ /\\\ /g")
+fi
+export QUERY_LOCAL
+
+# Here starts the list of all filters (grouped per view) that are associated to
+# the keys `KEYS_FILTER_0` - `KEYS_FILTER_9`. The filters in the `F_1_<view>`
+# variable are automatically applied whenever the given view is entered.
+F_1_VIEW_ARTIST="${F_1_VIEW_ARTIST:-"!'$q_has_seconary'"}"
+F_2_VIEW_ARTIST="${F_2_VIEW_ARTIST:-"'$q_album'"}"
+F_3_VIEW_ARTIST="${F_3_VIEW_ARTIST:-"'$q_ep'"}"
+F_4_VIEW_ARTIST="${F_4_VIEW_ARTIST:-"'$q_single'"}"
+F_5_VIEW_ARTIST="${F_5_VIEW_ARTIST:-}"
+F_6_VIEW_ARTIST="${F_6_VIEW_ARTIST:-}"
+F_7_VIEW_ARTIST="${F_7_VIEW_ARTIST:-}"
+F_8_VIEW_ARTIST="${F_8_VIEW_ARTIST:-}"
+F_9_VIEW_ARTIST="${F_9_VIEW_ARTIST:-}"
+export F_1_VIEW_ARTIST F_2_VIEW_ARTIST F_3_VIEW_ARTIST F_4_VIEW_ARTIST \
+  F_5_VIEW_ARTIST F_6_VIEW_ARTIST F_7_VIEW_ARTIST F_8_VIEW_ARTIST \
+  F_9_VIEW_ARTIST
+
+F_1_VIEW_RELEASEGROUP="${F_1_VIEW_RELEASEGROUP:-"${q_official:-}"}"
+F_2_VIEW_RELEASEGROUP="${F_2_VIEW_RELEASEGROUP:-}"
+F_3_VIEW_RELEASEGROUP="${F_3_VIEW_RELEASEGROUP:-}"
+F_4_VIEW_RELEASEGROUP="${F_4_VIEW_RELEASEGROUP:-}"
+F_5_VIEW_RELEASEGROUP="${F_5_VIEW_RELEASEGROUP:-}"
+F_6_VIEW_RELEASEGROUP="${F_6_VIEW_RELEASEGROUP:-}"
+F_7_VIEW_RELEASEGROUP="${F_7_VIEW_RELEASEGROUP:-}"
+F_8_VIEW_RELEASEGROUP="${F_8_VIEW_RELEASEGROUP:-}"
+F_9_VIEW_RELEASEGROUP="${F_9_VIEW_RELEASEGROUP:-}"
+export F_1_VIEW_RELEASEGROUP F_2_VIEW_RELEASEGROUP F_3_VIEW_RELEASEGROUP \
+  F_4_VIEW_RELEASEGROUP F_5_VIEW_RELEASEGROUP F_6_VIEW_RELEASEGROUP \
+  F_7_VIEW_RELEASEGROUP F_8_VIEW_RELEASEGROUP F_9_VIEW_RELEASEGROUP
+
+F_1_VIEW_RELEASE="${F_1_VIEW_RELEASE:-}"
+F_2_VIEW_RELEASE="${F_2_VIEW_RELEASE:-}"
+F_3_VIEW_RELEASE="${F_3_VIEW_RELEASE:-}"
+F_4_VIEW_RELEASE="${F_4_VIEW_RELEASE:-}"
+F_5_VIEW_RELEASE="${F_5_VIEW_RELEASE:-}"
+F_6_VIEW_RELEASE="${F_6_VIEW_RELEASE:-}"
+F_7_VIEW_RELEASE="${F_7_VIEW_RELEASE:-}"
+F_8_VIEW_RELEASE="${F_8_VIEW_RELEASE:-}"
+F_9_VIEW_RELEASE="${F_9_VIEW_RELEASE:-}"
+export F_1_VIEW_RELEASE F_2_VIEW_RELEASE F_3_VIEW_RELEASE F_4_VIEW_RELEASE \
+  F_5_VIEW_RELEASE F_6_VIEW_RELEASE F_7_VIEW_RELEASE F_8_VIEW_RELEASE \
+  F_9_VIEW_RELEASE
+
+F_1_LIST_ARTISTS="${F_1_LIST_ARTISTS:-}"
+F_2_LIST_ARTISTS="${F_2_LIST_ARTISTS:-}"
+F_3_LIST_ARTISTS="${F_3_LIST_ARTISTS:-}"
+F_4_LIST_ARTISTS="${F_4_LIST_ARTISTS:-}"
+F_5_LIST_ARTISTS="${F_5_LIST_ARTISTS:-}"
+F_6_LIST_ARTISTS="${F_6_LIST_ARTISTS:-}"
+F_7_LIST_ARTISTS="${F_7_LIST_ARTISTS:-}"
+F_8_LIST_ARTISTS="${F_8_LIST_ARTISTS:-}"
+F_9_LIST_ARTISTS="${F_9_LIST_ARTISTS:-}"
+export F_1_LIST_ARTISTS F_2_LIST_ARTISTS F_3_LIST_ARTISTS F_4_LIST_ARTISTS \
+  F_5_LIST_ARTISTS F_6_LIST_ARTISTS F_7_LIST_ARTISTS F_8_LIST_ARTISTS \
+  F_9_LIST_ARTISTS
+
+F_1_LIST_ALBUMS="${F_1_LIST_ALBUMS:-}"
+F_2_LIST_ALBUMS="${F_2_LIST_ALBUMS:-}"
+F_3_LIST_ALBUMS="${F_3_LIST_ALBUMS:-}"
+F_4_LIST_ALBUMS="${F_4_LIST_ALBUMS:-}"
+F_5_LIST_ALBUMS="${F_5_LIST_ALBUMS:-}"
+F_6_LIST_ALBUMS="${F_6_LIST_ALBUMS:-}"
+F_7_LIST_ALBUMS="${F_7_LIST_ALBUMS:-}"
+F_8_LIST_ALBUMS="${F_8_LIST_ALBUMS:-}"
+F_9_LIST_ALBUMS="${F_9_LIST_ALBUMS:-}"
+export F_1_LIST_ALBUMS F_2_LIST_ALBUMS F_3_LIST_ALBUMS F_4_LIST_ALBUMS \
+  F_5_LIST_ALBUMS F_6_LIST_ALBUMS F_7_LIST_ALBUMS F_8_LIST_ALBUMS \
+  F_9_LIST_ALBUMS

src/sh/fzf.sh

@@ -0,0 +1,50 @@
+# Print the fzf instructions that sets the header
+#
+# @argument $1: view
+# @argument $2: mbid
+fzf_command_set_header() {
+  view=$1
+  mbid=$2
+  case "$view" in
+  "$VIEW_SEARCH_ARTIST") header="Search artist on MusicBrainz" ;;
+  "$VIEW_SEARCH_ALBUM") header="Search album on MusicBrainz" ;;
+  "$VIEW_LIST_ARTISTS") header="Search locally available artist" ;;
+  "$VIEW_LIST_ALBUMS") header="Search locally available album" ;;
+  "$VIEW_ARTIST")
+    name="$(mb_artist "$mbid" | $JQ '.name')"
+    header=$(printf "$HEADER_ARTIST" "$name")
+    ;;
+  "$VIEW_RELEASEGROUP")
+    title="$(mb_releasegroup "$mbid" |
+      $JQ '.title')"
+    artist="$(mb_releasegroup "$mbid" |
+      $JQ '."artist-credit" | map(([.name, .joinphrase]|join(""))) | join("")')"
+    header=$(printf "$HEADER_ARTIST_RELEASEGROUP" "$artist" "$title")
+    ;;
+  "$VIEW_RELEASE")
+    title="$(mb_release "$mbid" |
+      $JQ '.title')"
+    artist="$(mb_release "$mbid" |
+      $JQ '."artist-credit" | map(([.name, .joinphrase]|join(""))) | join("")')"
+    releaseinfo="$(mb_release "$mbid" |
+      $JQ '[
+    .date[:4],
+    (."label-info" | map(.label.name) | unique | join(", ")),
+    (.media | map(."track-count") | add),
+    (.media | map(.format) | unique | join(", ")),
+    .country
+    ] | join("\t")' |
+      awk -F "\t" -v format="$HEADER_RELEASE_FORMAT" '{
+        gsub("&", "\\\\&")
+        sub("<<year>>", $1, format)
+        sub("<<label>>", $2, format)
+        sub("<<tracks>>", $3, format)
+        sub("<<media>>", $4, format)
+        sub("<<country>>", $5, format)
+        print format
+      }')"
+    header=$(printf "$HEADER_RELEASE" "$artist" "$title" "$releaseinfo")
+    ;;
+  esac
+  printf "+change-header(%s)" "${header:-"???"}"
+}

src/sh/helper.sh

@@ -1,15 +0,0 @@
-ERR="\033[38;5;196m"
-INFO="\033[38;5;75m"
-DBG=$ERR
-OFF="\033[m"
-err() {
-  echo "${ERR}ERROR:${OFF} ${1:-}" >/dev/stderr
-}
-
-info() {
-  echo "${INFO}Info:${OFF} ${1:-}" >/dev/stderr
-}
-
-debug() {
-  echo "${DBG}DEBUG${OFF} ${INFO}$(date)${OFF}: $*" >/dev/stderr
-}

src/sh/info.sh

@@ -1,5 +1,10 @@
-APP_NAME="muf"
+# Application information
-APP_VERSION="zero.zero"
+if [ ! "${INFO_LOADED:-}" ]; then
-APP_WEBSITE="https://git.indyfac.ch/amin/muf"
+  APP_NAME="fuzic"
-WINDOW_TITLE="🔎🎶 $APP_NAME | a simple music finder"
+  APP_VERSION="0.1"
+  APP_WEBSITE="https://git.indyfac.ch/amin/fuzic"
+  WINDOW_TITLE="🔎🎶 $APP_NAME | a simple music finder and player"
   export APP_NAME APP_VERSION APP_WEBSITE WINDOW_TITLE
+
+  export INFO_LOADED=1
+fi

src/sh/keys.sh

@@ -0,0 +1,380 @@
+# List of keys, organized in groups
+#
+# Mode selection:
+# - KEYS_I_NORMAL: Switch to normal mode (insert mode)
+# - KEYS_N_INSERT: Switch to insert mode (normal mode)
+#
+# Vertical navigation:
+# - KEYS_DOWN: Move cursor to the next line
+# - KEYS_UP: Move cursor to the previous line
+# - KEYS_HALFPAGE_UP: Move cursor half a page up
+# - KEYS_HALFPAGE_DOWN: Move cursor half a page up
+# - KEYS_N_DOWN: Move cursor to the next line (normal mode)
+# - KEYS_N_UP: Move cursor to the previous line (normal mode)
+# - KEYS_N_BOT: Move cursor to the last line (normal mode)
+# - KEYS_N_TOP: Move cursor to the first line (normal mode)
+#
+# Horizontal navigation:
+# - KEYS_IN: Enter into selected item, down the hierarchy
+# - KEYS_OUT: Leave current item, up the hierarchy
+# - KEYS_N_IN: Enter into selected item, down the hierarchy (normal mode)
+# - KEYS_N_OUT: Leave current item, up the hierarchy (normal mode)
+# - KEYS_SELECT_ARTIST: Go to artist of selected entry (in case of multiple
+# artists, provide a choice)
+# - KEYS_LIST_ARTISTS: Go to VIEW_LIST_ARTISTS
+# - KEYS_LIST_ALBUMS: Go to VIEW_LIST_ALBUMS
+# - KEYS_SEARCH_ARTIST: Go to VIEW_SEARCH_ARTIST
+# - KEYS_SEARCH_ALBUM: Go to VIEW_SEARCH_ALBUM
+# - KEYS_SWITCH_ARTIST_ALBUM: Switch artist and album views, i.e.,
+# VIEW_LIST_ARTISTS <-> VIEW_LIST_ALBUMS, and VIEW_SEARCH_ARTIST <->
+# VIEW_SEARCH_ALBUM.
+# - KEYS_SWITCH_LOCAL_REMOTE: Switch between locally available music and remote
+# search views, i.e., VIEW_LIST_ARTISTS <-> VIEW_SEARCH_ARTIST, and
+# VIEW_LIST_ALBUMS <-> VIEW_SEARCH_ALBUM.
+#
+# Filtering:
+# - KEYS_FILTER_LOCAL: List only locally available entries
+# - KEYS_FILTER_0: Clear query
+# - KEYS_FILTER_1: Reset query to the default one for the current view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_2: Preset query `2` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_3: Preset query `3` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_4: Preset query `4` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_5: Preset query `5` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_6: Preset query `6` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_7: Preset query `7` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_8: Preset query `8` depending on the view (see `src/sh/filter.sh`)
+# - KEYS_FILTER_9: Preset query `9` depending on the view (see `src/sh/filter.sh`)
+#
+# Specials:
+# - KEYS_BROWSE: Open MusicBrainz webpage of the selected item
+# - KEYS_OPEN: Open file manager in the directory of the selected item
+# - KEYS_N_YANK: Copy MusicBrainz ID of selected item to clipboard
+# - KEYS_YANK_CURRENT: Copy MusicBrainz ID of current item to clipboard
+# - KEYS_SHOW_PLAYLIST: Switch to playlist view
+# - KEYS_KEYBINDINGS: Show keybindings
+# - KEYS_QUIT: Quit application
+# - KEYS_N_QUIT: Quit application if we are in VIEW_LIST_ARTISTS, else go to
+# view VIEW_LIST_ARTISTS (normal mode)
+# - KEYS_SCROLL_PREVIEW_DOWN: Scroll preview down
+# - KEYS_SCROLL_PREVIEW_UP: Scroll preview up
+# - KEYS_PREVIEW_OPEN: Open preview window
+# - KEYS_PREVIEW_CLOSE: Close preview window
+# - KEYS_REFRESH: Refresh current entry
+#
+# Playback:
+# - KEYS_PLAY: Play selected release or selected track
+# - KEYS_QUEUE: Queue selected release or selected track
+# - KEYS_QUEUE_NEXT: Queue selected release or selected track as next entry in
+# the playlist
+# - KEYS_N_TOGGLE_PLAYBACK: Play-pause toggle
+# - KEYS_N_PLAY_NEXT: Play next track
+# - KEYS_N_PLAY_PREV: Play previous track
+# - KEYS_N_SEEK_FORWARD: Seek forward
+# - KEYS_N_SEEK_BACKWARD: Seek backward
+#
+# Playlist (in the playlist, there is no `insert` mode):
+# - KEYS_PLAYLIST_RELOAD: Manually reload playlist
+# - KEYS_PLAYLIST_REMOVE: Remove item from playlist
+# - KEYS_PLAYLIST_UP: Move item one position up
+# - KEYS_PLAYLIST_DOWN: Move item one position down
+# - KEYS_PLAYLIST_CLEAR: Clear playlist
+# - KEYS_PLAYLIST_CLEAR_ABOVE: Remove all items above incl. the selected one
+# - KEYS_PLAYLIST_CLEAR_BELOW: Remove all items below incl. the selected one
+# - KEYS_PLAYLIST_SHUFFLE: Shuffle playlist
+# - KEYS_PLAYLIST_UNSHUFFLE: Unshuffle previously shuffled playlist
+# - KEYS_PLAYLIST_GOTO_RELEASE: Jump to release or selected entry
+# - KEYS_PLAYLIST_STORE: Store current playlist as file
+# - KEYS_PLAYLIST_LOAD: Load playlist from file
+# - KEYS_PLAYLIST_QUIT: Quit playlist view
+
+if [ ! "${KEYS_LOADED:-}" ]; then
+  # Mode selection:
+  KEYS_I_NORMAL="${KEYS_I_NORMAL:-"esc"}"
+  KEYS_N_INSERT="${KEYS_N_INSERT:-"a,i,/,?"}"
+  export KEYS_I_NORMAL KEYS_N_INSERT
+
+  # Vertical navigation:
+  KEYS_DOWN="${KEYS_DOWN:-"ctrl-j,down"}"
+  KEYS_UP="${KEYS_UP:-"ctrl-k,up"}"
+  KEYS_HALFPAGE_DOWN="${KEYS_HALFPAGE_DOWN:-"ctrl-d"}"
+  KEYS_HALFPAGE_UP="${KEYS_HALFPAGE_UP:-"ctrl-u"}"
+  KEYS_N_DOWN="${KEYS_N_DOWN:-"j"}"
+  KEYS_N_UP="${KEYS_N_UP:-"k"}"
+  KEYS_N_BOT="${KEYS_N_BOT:-"G"}"
+  KEYS_N_TOP="${KEYS_N_TOP:-"1"}"
+  export KEYS_DOWN KEYS_UP KEYS_HALFPAGE_DOWN KEYS_HALFPAGE_UP KEYS_N_DOWN \
+    KEYS_N_UP KEYS_N_BOT KEYS_N_TOP
+
+  # Horizontal navigation:
+  KEYS_IN="${KEYS_IN:-"ctrl-l"}"
+  KEYS_OUT="${KEYS_OUT:-"ctrl-h"}"
+  KEYS_N_IN="${KEYS_N_IN:-"l"}"
+  KEYS_N_OUT="${KEYS_N_OUT:-"h"}"
+  KEYS_SELECT_ARTIST="${KEYS_SELECT_ARTIST:-"ctrl-a"}"
+  KEYS_LIST_ARTISTS="${KEYS_LIST_ARTISTS:-"alt-a"}"
+  KEYS_LIST_ALBUMS="${KEYS_LIST_ALBUMS:-"alt-s"}"
+  KEYS_SEARCH_ARTIST="${KEYS_SEARCH_ARTIST:-"alt-z"}"
+  KEYS_SEARCH_ALBUM="${KEYS_SEARCH_ALBUM:-"alt-x"}"
+  KEYS_SWITCH_ARTIST_ALBUM="${KEYS_SWITCH_ARTIST_ALBUM:-"tab"}"
+  KEYS_SWITCH_LOCAL_REMOTE="${KEYS_SWITCH_LOCAL_REMOTE:-"ctrl-/"}"
+  export KEYS_IN KEYS_OUT KEYS_N_IN KEYS_N_OUT KEYS_SELECT_ARTIST \
+    KEYS_LIST_ARTISTS KEYS_LIST_ALBUMS KEYS_SEARCH_ARTIST KEYS_SEARCH_ALBUM \
+    KEYS_SWITCH_ARTIST_ALBUM KEYS_SWITCH_LOCAL_REMOTE
+
+  # Filtering:
+  KEYS_FILTER_LOCAL="${KEYS_FILTER_LOCAL:-"alt-l"}"
+  KEYS_FILTER_1="${KEYS_FILTER_1:-"alt-1"}"
+  KEYS_FILTER_2="${KEYS_FILTER_2:-"alt-2"}"
+  KEYS_FILTER_3="${KEYS_FILTER_3:-"alt-3"}"
+  KEYS_FILTER_4="${KEYS_FILTER_4:-"alt-4"}"
+  KEYS_FILTER_5="${KEYS_FILTER_5:-"alt-5"}"
+  KEYS_FILTER_6="${KEYS_FILTER_6:-"alt-6"}"
+  KEYS_FILTER_7="${KEYS_FILTER_7:-"alt-7"}"
+  KEYS_FILTER_8="${KEYS_FILTER_8:-"alt-8"}"
+  KEYS_FILTER_9="${KEYS_FILTER_9:-"alt-9"}"
+  KEYS_FILTER_0="${KEYS_FILTER_0:-"alt-0"}"
+  KEYS_FILTER="$KEYS_FILTER_LOCAL,$KEYS_FILTER_1,$KEYS_FILTER_2,$KEYS_FILTER_3,$KEYS_FILTER_4,$KEYS_FILTER_5,$KEYS_FILTER_6,$KEYS_FILTER_7,$KEYS_FILTER_8,$KEYS_FILTER_9,$KEYS_FILTER_0"
+  export KEYS_FILTER_LOCAL KEYS_FILTER_1 KEYS_FILTER_2 KEYS_FILTER_3 \
+    KEYS_FILTER_4 KEYS_FILTER_5 KEYS_FILTER_6 KEYS_FILTER_7 KEYS_FILTER_8 \
+    KEYS_FILTER_9 KEYS_FILTER_0 KEYS_FILTER
+
+  # Specials:
+  KEYS_BROWSE="${KEYS_BROWSE:-"alt-b"}"
+  KEYS_OPEN="${KEYS_OPEN:-"alt-o"}"
+  KEYS_N_YANK="${KEYS_N_YANK:-"y"}"
+  KEYS_YANK_CURRENT="${KEYS_YANK_CURRENT:-"ctrl-y"}"
+  KEYS_SHOW_PLAYLIST="${KEYS_SHOW_PLAYLIST:-"ctrl-p"}"
+  KEYS_KEYBINDINGS="${KEYS_KEYBINDINGS:-"alt-?"}"
+  KEYS_QUIT="${KEYS_QUIT:-"ctrl-c"}"
+  KEYS_N_QUIT="${KEYS_N_QUIT:-"q"}"
+  KEYS_SCROLL_PREVIEW_DOWN="${KEYS_SCROLL_PREVIEW_DOWN:-"page-down"}"
+  KEYS_SCROLL_PREVIEW_UP="${KEYS_SCROLL_PREVIEW_UP:-"page-up"}"
+  KEYS_PREVIEW_OPEN="${KEYS_PREVIEW_OPEN:-"alt-up"}"
+  KEYS_PREVIEW_CLOSE="${KEYS_PREVIEW_CLOSE:-"alt-down"}"
+  KEYS_REFRESH="${KEYS_REFRESH:-"ctrl-r"}"
+  export KEYS_BROWSE KEYS_OPEN KEYS_N_YANK KEYS_YANK_CURRENT KEYS_SHOW_PLAYLIST \
+    KEYS_KEYBINDINGS KEYS_QUIT KEYS_N_QUIT KEYS_SCROLL_PREVIEW_DOWN \
+    KEYS_SCROLL_PREVIEW_UP KEYS_PREVIEW_CLOSE KEYS_PREVIEW_OPEN KEYS_REFRESH
+
+  # Playback:
+  KEYS_PLAY="${KEYS_PLAY:-"enter"}"
+  KEYS_QUEUE="${KEYS_QUEUE:-"ctrl-alt-m"}" # That's actually alt-enter
+  KEYS_QUEUE_NEXT="${KEYS_QUEUE_NEXT:-"ctrl-alt-n"}"
+  KEYS_TOGGLE_PLAYBACK="${KEYS_TOGGLE_PLAYBACK:-"ctrl-space"}"
+  KEYS_PLAY_NEXT="${KEYS_PLAY_NEXT:-"alt-n"}"
+  KEYS_PLAY_PREV="${KEYS_PLAY_PREV:-"alt-p"}"
+  KEYS_SEEK_FORWARD="${KEYS_SEEK_FORWARD:-"alt-N"}"
+  KEYS_SEEK_BACKWARD="${KEYS_SEEK_BACKWARD:-"alt-P"}"
+  KEYS_PLAYBACK="$KEYS_PLAY,$KEYS_QUEUE,$KEYS_QUEUE_NEXT,$KEYS_TOGGLE_PLAYBACK,$KEYS_PLAY_NEXT,$KEYS_PLAY_PREV,$KEYS_SEEK_FORWARD,$KEYS_SEEK_BACKWARD"
+  KEYS_N_PLAY="${KEYS_N_PLAY:-"."}"
+  KEYS_N_QUEUE="${KEYS_N_QUEUE:-";"}"
+  KEYS_N_QUEUE_NEXT="${KEYS_N_QUEUE_NEXT:-":"}"
+  KEYS_N_TOGGLE_PLAYBACK="${KEYS_N_TOGGLE_PLAYBACK:-"space"}"
+  KEYS_N_PLAY_NEXT="${KEYS_N_PLAY_NEXT:-"right,n"}"
+  KEYS_N_PLAY_PREV="${KEYS_N_PLAY_PREV:-"left,p"}"
+  KEYS_N_SEEK_FORWARD="${KEYS_N_SEEK_FORWARD:-"N,f"}"
+  KEYS_N_SEEK_BACKWARD="${KEYS_N_SEEK_BACKWARD:-"P,b"}"
+  KEYS_N_PLAYBACK="$KEYS_N_PLAY,$KEYS_N_QUEUE,$KEYS_N_QUEUE_NEXT,$KEYS_N_TOGGLE_PLAYBACK,$KEYS_N_PLAY_NEXT,$KEYS_N_PLAY_PREV,$KEYS_N_SEEK_FORWARD,$KEYS_N_SEEK_BACKWARD"
+  export KEYS_PLAY KEYS_QUEUE KEYS_QUEUE_NEXT KEYS_TOGGLE_PLAYBACK \
+    KEYS_PLAY_NEXT KEYS_PLAY_PREV KEYS_SEEK_FORWARD KEYS_SEEK_BACKWARD \
+    KEYS_PLAYBACK KEYS_N_PLAY KEYS_N_QUEUE KEYS_N_QUEUE_NEXT \
+    KEYS_N_TOGGLE_PLAYBACK KEYS_N_PLAY_NEXT KEYS_N_PLAY_PREV \
+    KEYS_N_SEEK_FORWARD KEYS_N_SEEK_BACKWARD KEYS_N_PLAYBACK
+
+  # Playlist (in the playlist, there is no `insert` mode):
+  KEYS_PLAYLIST_RELOAD="${KEYS_PLAYLIST_RELOAD:-"r,ctrl-r"}"
+  KEYS_PLAYLIST_REMOVE="${KEYS_PLAYLIST_REMOVE:-"x,delete"}"
+  KEYS_PLAYLIST_UP="${KEYS_PLAYLIST_UP:-"u"}"
+  KEYS_PLAYLIST_DOWN="${KEYS_PLAYLIST_DOWN:-"d"}"
+  KEYS_PLAYLIST_CLEAR="${KEYS_PLAYLIST_CLEAR:-"C"}"
+  KEYS_PLAYLIST_CLEAR_ABOVE="${KEYS_PLAYLIST_CLEAR_ABOVE:-"U"}"
+  KEYS_PLAYLIST_CLEAR_BELOW="${KEYS_PLAYLIST_CLEAR_BELOW:-"D"}"
+  KEYS_PLAYLIST_SHUFFLE="${KEYS_PLAYLIST_SHUFFLE:-"s"}"
+  KEYS_PLAYLIST_UNSHUFFLE="${KEYS_PLAYLIST_UNSHUFFLE:-"S"}"
+  KEYS_PLAYLIST_GOTO_RELEASE="${KEYS_PLAYLIST_GOTO_RELEASE:-"ctrl-g"}"
+  KEYS_PLAYLIST_STORE="${KEYS_PLAYLIST_STORE:-"ctrl-s"}"
+  KEYS_PLAYLIST_LOAD="${KEYS_PLAYLIST_LOAD:-"ctrl-o"}"
+  export KEYS_PLAYLIST_RELOAD KEYS_PLAYLIST_REMOVE KEYS_PLAYLIST_UP \
+    KEYS_PLAYLIST_DOWN KEYS_PLAYLIST_CLEAR KEYS_PLAYLIST_CLEAR_ABOVE \
+    KEYS_PLAYLIST_CLEAR_BELOW KEYS_PLAYLIST_SHUFFLE KEYS_PLAYLIST_UNSHUFFLE \
+    KEYS_PLAYLIST_GOTO_RELEASE KEYS_PLAYLIST_STORE KEYS_PLAYLIST_LOAD
+
+  export KEYS_LOADED=1
+fi
+
+# Local method to print keybindin groups
+#
+# @argument $1: Group name
+# @argument $2: Keys for first item
+# @argument $3: Description of first item
+# @argument $4: Keys for second item (optional)
+# @argument $5: Description of second item (optional)
+# @argument ...
+#
+# This is a helper method for printing key-binding groups.
+__keybindinggroup_from_args() {
+  printf "$KBF_GROUP\n" "$1"
+  shift
+  {
+    while [ "$*" ]; do
+      printf "$KBF_KEY:\t$KBF_DESC\n" "$1" "${2:-"no description"}"
+      shift
+      shift
+    done
+  } | column -t -s "$(printf '\t')"
+  #} | column -t -s "$(printf '\t')" -c "$FZF_PREVIEW_COLUMNS" -W 2
+  printf "\n\n"
+}
+
+# Print view-dependent keybindings
+#
+# @argument $1: view
+#
+# This method pretty-prints the keybindings active at the given view.
+print_keybindings() {
+  view=$1
+  case "$view" in
+  "$VIEW_SELECT_ARTIST")
+    __keybindinggroup_from_args "Previews" \
+      "$KEYS_SCROLL_PREVIEW_DOWN" "Scroll preview down" \
+      "$KEYS_SCROLL_PREVIEW_UP" "Scroll preview up" \
+      "$KEYS_KEYBINDINGS" "Show these keybindings" \
+      "$KEYS_PREVIEW_OPEN" "Open preview window" \
+      "$KEYS_PREVIEW_CLOSE" "Close preview window"
+    __keybindinggroup_from_args "Navigation" \
+      "$KEYS_DOWN" "Down" \
+      "$KEYS_UP" "Up" \
+      "$KEYS_HALFPAGE_DOWN" "Down half a page" \
+      "$KEYS_HALFPAGE_UP" "Up half a page" \
+      "enter,$KEYS_IN" "Go to selected artist" \
+      "$KEYS_OUT,$KEYS_QUIT" "Return to previews view"
+    __keybindinggroup_from_args "Views" \
+      "$KEYS_LIST_ARTISTS" "Display artists in local database" \
+      "$KEYS_LIST_ALBUMS" "Display albums in local database" \
+      "$KEYS_SEARCH_ARTIST" "Show artist on MusicBrainz" \
+      "$KEYS_SEARCH_ALBUM" "Show album on MusicBrainz"
+    __keybindinggroup_from_args "Special operations" \
+      "$KEYS_SHOW_PLAYLIST" "Show playlist" \
+      "$KEYS_BROWSE" "Open artist in browser"
+    __keybindinggroup_from_args "Filtering" \
+      "$KEYS_FILTER_LOCAL" "Show only entries in local database"
+    ;;
+  "$VIEW_PLAYLIST")
+    __keybindinggroup_from_args "Previews" \
+      "$KEYS_SCROLL_PREVIEW_DOWN" "Scroll preview down" \
+      "$KEYS_SCROLL_PREVIEW_UP" "Scroll preview up" \
+      "$KEYS_KEYBINDINGS" "Show these keybindings" \
+      "$KEYS_PREVIEW_CLOSE" "Close preview window"
+    __keybindinggroup_from_args "Navigation" \
+      "$KEYS_DOWN,$KEYS_N_DOWN" "Down" \
+      "$KEYS_UP,$KEYS_N_UP" "Up" \
+      "$KEYS_HALFPAGE_DOWN" "Down half a page" \
+      "$KEYS_HALFPAGE_UP" "Up half a page" \
+      "$KEYS_N_TOP" "Go to first entry" \
+      "$KEYS_N_BOT" "Go to last entry" \
+      "$KEYS_OUT,$KEYS_N_OUT,$KEYS_QUIT,$KEYS_N_QUIT" "Leave playlist view" \
+      "$KEYS_SELECT_ARTIST" "Go to artist of selected item"
+    __keybindinggroup_from_args "Views" \
+      "$KEYS_LIST_ARTISTS" "Display artists in local database" \
+      "$KEYS_LIST_ALBUMS" "Display albums in local database" \
+      "$KEYS_SEARCH_ARTIST" "Show artist on MusicBrainz" \
+      "$KEYS_SEARCH_ALBUM" "Show album on MusicBrainz"
+    __keybindinggroup_from_args "Playlist" \
+      "$KEYS_PLAYLIST_RELOAD" "Reload playlist" \
+      "$KEYS_PLAYLIST_REMOVE" "Remove selected track" \
+      "$KEYS_PLAYLIST_UP" "Move track up" \
+      "$KEYS_PLAYLIST_DOWN" "Move track down" \
+      "$KEYS_PLAYLIST_CLEAR" "Clear playlist" \
+      "$KEYS_PLAYLIST_CLEAR_ABOVE" "Remove all tracks above" \
+      "$KEYS_PLAYLIST_CLEAR_BELOW" "Remove all tracks below" \
+      "$KEYS_PLAYLIST_SHUFFLE" "Shuffle" \
+      "$KEYS_PLAYLIST_UNSHUFFLE" "Undo shuffle" \
+      "$KEYS_PLAYLIST_GOTO_RELEASE" "Show release of selected track"
+    __keybindinggroup_from_args "Playback" \
+      "$KEYS_PLAY,$KEYS_N_PLAY" "Play selected item" \
+      "$KEYS_QUEUE,$KEYS_N_QUEUE" "Queue selected item" \
+      "$KEYS_QUEUE_NEXT,$KEYS_N_QUEUE_NEXT" "Play selected item next" \
+      "$KEYS_TOGGLE_PLAYBACK,$KEYS_N_TOGGLE_PLAYBACK" "Toggle playback" \
+      "$KEYS_PLAY_NEXT,$KEYS_N_PLAY_NEXT" "Play next track" \
+      "$KEYS_PLAY_PREV,$KEYS_N_PLAY_PREV" "Play previous track" \
+      "$KEYS_SEEK_FORWARD,$KEYS_N_SEEK_FORWARD" "Seek forward" \
+      "$KEYS_SEEK_BACKWARD,$KEYS_N_SEEK_BACKWARD" "Seek backward"
+    __keybindinggroup_from_args "Special operations" \
+      "$KEYS_BROWSE" "Open selected item in browser" \
+      "$KEYS_OPEN" "Open selected item in file manager" \
+      "$KEYS_N_YANK" "Copy MusicBrainz track ID" \
+      "$KEYS_YANK_CURRENT" "Copy MusicBrainz release ID"
+    ;;
+  *)
+    __keybindinggroup_from_args "Switch between modes" \
+      "$KEYS_I_NORMAL" "Swtich to normal mode (insert)" \
+      "$KEYS_N_INSERT" "Swtich to insert mode (normal)"
+    __keybindinggroup_from_args "Previews" \
+      "$KEYS_SCROLL_PREVIEW_DOWN" "Scroll preview down" \
+      "$KEYS_SCROLL_PREVIEW_UP" "Scroll preview up" \
+      "$KEYS_KEYBINDINGS" "Show these keybindings" \
+      "$KEYS_PREVIEW_OPEN" "Open preview window" \
+      "$KEYS_PREVIEW_CLOSE" "Close preview window"
+    __keybindinggroup_from_args "Navigation" \
+      "$KEYS_DOWN" "Down" \
+      "$KEYS_UP" "Up" \
+      "$KEYS_N_DOWN" "Down (normal)" \
+      "$KEYS_N_UP" "Up (normal)" \
+      "$KEYS_HALFPAGE_DOWN" "Down half a page" \
+      "$KEYS_HALFPAGE_UP" "Up half a page" \
+      "$KEYS_N_TOP" "Go to first entry (normal)" \
+      "$KEYS_N_BOT" "Go to last entry (normal)" \
+      "$KEYS_IN" "Open selected item" \
+      "$KEYS_N_IN" "Open selected item (normal)" \
+      "$KEYS_OUT" "Leave current item" \
+      "$KEYS_N_OUT" "Leave current item (normal)" \
+      "$KEYS_SELECT_ARTIST" "Go to artist of selected item"
+    __keybindinggroup_from_args "Views" \
+      "$KEYS_LIST_ARTISTS" "Display artists in local database" \
+      "$KEYS_LIST_ALBUMS" "Display albums in local database" \
+      "$KEYS_SEARCH_ARTIST" "Show artist on MusicBrainz" \
+      "$KEYS_SEARCH_ALBUM" "Show album on MusicBrainz" \
+      "$KEYS_SWITCH_ARTIST_ALBUM" "Swtich artist / album" \
+      "$KEYS_SWITCH_LOCAL_REMOTE" "Swtich local database / MusicBrainz"
+    __keybindinggroup_from_args "Filtering" \
+      "$KEYS_FILTER_LOCAL" "Show only entries in local database" \
+      "$KEYS_FILTER_0" "Clear filter" \
+      "$KEYS_FILTER_1" "Reset filter to default for current view" \
+      "$KEYS_FILTER_2" "Custom filter" \
+      "$KEYS_FILTER_3" "Custom filter" \
+      "$KEYS_FILTER_4" "Custom filter" \
+      "$KEYS_FILTER_5" "Custom filter" \
+      "$KEYS_FILTER_6" "Custom filter" \
+      "$KEYS_FILTER_7" "Custom filter" \
+      "$KEYS_FILTER_8" "Custom filter" \
+      "$KEYS_FILTER_9" "Custom filter"
+    __keybindinggroup_from_args "Playback" \
+      "$KEYS_PLAY" "Play selected item" \
+      "$KEYS_QUEUE" "Queue selected item" \
+      "$KEYS_QUEUE_NEXT" "Play selected item next" \
+      "$KEYS_TOGGLE_PLAYBACK" "Toggle playback" \
+      "$KEYS_PLAY_NEXT" "Play next track" \
+      "$KEYS_PLAY_PREV" "Play previous track" \
+      "$KEYS_SEEK_FORWARD" "Seek forward" \
+      "$KEYS_SEEK_BACKWARD" "Seek backward"
+    __keybindinggroup_from_args "Playback (normal)" \
+      "$KEYS_N_PLAY" "Play selected item" \
+      "$KEYS_N_QUEUE" "Queue selected item" \
+      "$KEYS_N_QUEUE_NEXT" "Play selected item next" \
+      "$KEYS_N_TOGGLE_PLAYBACK" "Toggle playback" \
+      "$KEYS_N_PLAY_NEXT" "Play next track" \
+      "$KEYS_N_PLAY_PREV" "Play previous track" \
+      "$KEYS_N_SEEK_FORWARD" "Seek forward" \
+      "$KEYS_N_SEEK_BACKWARD" "Seek backward"
+    __keybindinggroup_from_args "Special operations" \
+      "$KEYS_SHOW_PLAYLIST" "Show playlist" \
+      "$KEYS_BROWSE" "Open selected item in browser" \
+      "$KEYS_OPEN" "Open selected item in file manager" \
+      "$KEYS_N_YANK" "Copy selected MusicBrainz ID (normal)" \
+      "$KEYS_YANK_CURRENT" "Copy current MusicBrainz ID" \
+      "$KEYS_REFRESH" "Refresh current entry" \
+      "$KEYS_QUIT" "Quit applicaion" \
+      "$KEYS_N_QUIT" "First view or quit (normal)"
+    ;;
+  esac
+}

src/sh/lists.sh

@@ -0,0 +1,195 @@
+# These methods generate lists that are used as input to FZF.
+
+# List release groups of given artist
+#
+# argument $1: MusicBrainz artist ID
+list_releasegroups() {
+  name=$(mb_artist "$1" | $JQ '.name')
+  mb_artist_releasegroups "$1" |
+    $JQ '."release-groups"[] | [
+  .id,
+  ."primary-type",
+  (."secondary-types" // []|join(";")),
+  ."first-release-date",
+  .title,
+  (."artist-credit" | map(([.name, .joinphrase]|join(""))) | join(""))
+  ] | join("\t")' |
+    awk \
+      -F "\t" \
+      -v artist="$name" \
+      -v artistid="$1" \
+      -v file_local_releasegroups="${LOCALDATA_RELEASEGROUPS:-}" \
+      -v format_release="$RGV_RELEASE" \
+      -v format_release_w_artist="$RGV_RELEASE_W_ARTIST" \
+      -v format_year="$RGV_YEAR" \
+      -v format_album="$FORMAT_TYPE_ALBUM" \
+      -v format_single="$FORMAT_TYPE_SINGLE" \
+      -v format_ep="$FORMAT_TYPE_EP" \
+      -v format_broadcast="$FORMAT_TYPE_BROADCAST" \
+      -v format_other="$FORMAT_TYPE_OTHER" \
+      -v format_has_secondary="$FORMAT_TYPE_HAS_SECONDARY" \
+      -v format_secondary="$FORMAT_TYPE_SECONDARY" \
+      -v format_compilation="$FORMAT_TYPE_SECONDARY_COMPILATION" \
+      -v format_soundtrack="$FORMAT_TYPE_SECONDARY_SOUNDTRACK" \
+      -v format_spokenword="$FORMAT_TYPE_SECONDARY_SPOKENWORD" \
+      -v format_interview="$FORMAT_TYPE_SECONDARY_INTERVIEW" \
+      -v format_audiobook="$FORMAT_TYPE_SECONDARY_AUDIOBOOK" \
+      -v format_audiodrama="$FORMAT_TYPE_SECONDARY_AUDIODRAMA" \
+      -v format_live="$FORMAT_TYPE_SECONDARY_LIVE" \
+      -v format_remix="$FORMAT_TYPE_SECONDARY_REMIX" \
+      -v format_djmix="$FORMAT_TYPE_SECONDARY_DJMIX" \
+      -v format_mixtape="$FORMAT_TYPE_SECONDARY_MIXTAPE" \
+      -v format_demo="$FORMAT_TYPE_SECONDARY_DEMO" \
+      -v format_fieldrec="$FORMAT_TYPE_SECONDARY_FIELDREC" \
+      -v format_local="$FORMAT_LOCAL" \
+      "$AWK_RELEASEGROUPS" |
+    sort -n -r |
+    cut -d "$(printf '\t')" -f 2- |
+    column -t -s "$(printf '\t')" |
+    sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\)$|\t\1\t\2|'
+}
+
+# List releases in given relese group
+#
+# argument $1: MusicBrainz release-group ID
+list_releases() {
+  title="$(mb_releasegroup "$1" |
+    $JQ '.title')"
+  artist="$(mb_releasegroup "$1" |
+    $JQ '."artist-credit" | map(([.name, .joinphrase]|join(""))) | join("")')"
+  mb_releasegroup_releases "$1" |
+    $JQ '."releases"[] | [
+  .id,
+  .status,
+  .date,
+  ."cover-art-archive".count,
+  (."label-info" | map(.label.name) | unique | join(", ")),
+  (.media | map(."track-count") | add),
+  (.media | map(.format) | unique | join(", ")),
+  .country,
+  .title,
+  (."artist-credit" | map(([.name, .joinphrase]|join(""))) | join(""))
+  ] | join("\t")' |
+    awk \
+      -F "\t" \
+      -v file_local_releases="${LOCALDATA_RELEASES:-}" \
+      -v release_official="$FORMAT_STATUS_OFFICIAL" \
+      -v release_promotion="$FORMAT_STATUS_PROMO" \
+      -v release_bootleg="$FORMAT_STATUS_BOOTLEG" \
+      -v release_pseudo="$FORMAT_STATUS_PSEUDO" \
+      -v release_withdrawn="$FORMAT_STATUS_WITHDRAWN" \
+      -v release_expunged="$FORMAT_STATUS_EXPUNGED" \
+      -v release_cancelled="$FORMAT_STATUS_CANCELLED" \
+      -v format_release="$RV_FORMAT" \
+      -v format_release_title_artist="$RV_TITLE_ARTIST" \
+      -v format_release_title="$RV_TITLE" \
+      -v format_release_artist="$RV_ARTIST" \
+      -v rg_artist="$artist" \
+      -v rg_title="$title" \
+      -v rgid="$1" \
+      -v format_local="$FORMAT_LOCAL" \
+      "$AWK_RELEASES" |
+    sort -n -r |
+    cut -d "$(printf '\t')" -f 2- |
+    column -t -s "$(printf '\t')" |
+    sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\):\(.*$\)$|\t\1\t\2\t\3|'
+}
+
+# List recordings of given release
+#
+# argument $1: MusicBrainz release ID
+list_recordings() {
+  deco="$(grep "$1" "$LOCALDATA_RELEASES" | cut -d "$(printf '\t')" -f 2)"
+  if [ "$deco" ]; then
+    rectmp=$(mktemp)
+    $JQ '.tracks | keys | join("\n")' "$deco" >"$rectmp"
+  fi
+  mb_release "$1" |
+    $JQ \
+      --arg rid "$1" \
+      --arg deco "$deco" \
+      '.media[] |
+        .position as $pos |
+        .tracks[] | [
+          $rid,
+          .id,
+          $pos,
+          .number,
+          .length,
+          .recording.title,
+          (.recording."artist-credit" | map([.name, .joinphrase] | join("")) | join("")),
+          $deco
+        ] |
+        join("\t")' |
+    awk \
+      -F "\t" \
+      -v file_local_recordings="${rectmp:-}" \
+      -v format="$REC_FORMAT" \
+      -v format_local="$FORMAT_LOCAL" \
+      "$AWK_RECORDINGS" |
+    sort -k1,1n -k2,2g |
+    cut -d "$(printf '\t')" -f 2- |
+    column -t -s "$(printf '\t')" -R 3,4,7 |
+    sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\):\(.*$\)$|\t\1\t\2\t\3|'
+  if [ "${rectmp:-}" ] && [ -f "$rectmp" ]; then
+    rm -f "$rectmp"
+  fi
+}
+
+# List artists available locally
+list_local_artists() {
+  cat "$LOCALDATA_ARTISTS_VIEW" 2>/dev/null
+}
+
+# List release groups vailable locally
+list_local_releasegroups() {
+  cat "$LOCALDATA_RELEASEGROUPS_VIEW" 2>/dev/null
+}
+
+# List artist from input json data
+#
+# The input is read from stdin
+list_artists_from_json() {
+  cat |
+    $JQ 'map([.artist.id, .artist.type, .name] | join("\t")) | join("\n")' |
+    awk \
+      -F "\t" \
+      -v file_local_artists="${LOCALDATA_ARTISTS:-}" \
+      -v format_person="$AV_PERSON" \
+      -v format_group="$AV_GROUP" \
+      -v format_disambiguation="$AV_DISAMBIGUATION" \
+      -v format_local="$FORMAT_LOCAL" \
+      "$AWK_ARTISTS" |
+    column -t -s "$(printf '\t')" -l 2
+}
+
+# Print playlist currently loaded
+list_playlist() {
+  count=$(mpv_playlist_count)
+  [ "$count" -eq 0 ] && return 0
+  mpvquery=""
+  for i in $(seq 0 $((count - 1))); do
+    mpvquery="$mpvquery\${playlist/$i/current}\t\${playlist/$i/title}\n"
+  done
+  mpvtmp=$(mktemp)
+  # Get playlist information from mpv
+  __mpv_get "$mpvquery" | grep '.' >"$mpvtmp"
+  # Get MusicBrainz Track ID of current recording
+  current_id=$(grep "^yes" "$mpvtmp" | cut -d "$(printf '\t')" -f 3)
+  # Get file to be used in file_local_recordings
+  rectmp=$(mktemp)
+  cut -d "$(printf '\t')" -f 3 "$mpvtmp" >"$rectmp"
+  # Get list
+  cut -d "$(printf '\t')" -f 2- "$mpvtmp" |
+    awk \
+      -F "\t" \
+      -v file_local_recordings="${rectmp:-}" \
+      -v format="$REC_FORMAT_NO_NUMBER" \
+      -v format_current="$FORMAT_CURRENT" \
+      -v current_id="$current_id" \
+      "$AWK_RECORDINGS" |
+    cut -d "$(printf '\t')" -f 2- |
+    column -t -s "$(printf '\t')" -R 5 |
+    sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\):\(.*$\)$|\t\1\t\2\t\3|'
+  rm -f "$rectmp" "$mpvtmp"
+}

src/sh/local.sh

@@ -1,14 +1,51 @@
-gettags() {
+# Database functionality to support local music.
+#
+# All local data is stored in the directory `LOCALDATADIR`. In the future, we
+# will also use the methods here, and modifications thereof, to support
+# MusicBainz collections.
+if [ ! "${LOCAL_LOADED:-}" ]; then
+  LOCALDATADIR="$HOME/.cache/$APP_NAME/local"
+  LOCALDATA_ARTISTS="$LOCALDATADIR/artists"
+  LOCALDATA_RELEASEGROUPS="$LOCALDATADIR/releasegroups"
+  LOCALDATA_RELEASES="$LOCALDATADIR/releases"
+  LOCALDATA_ARTISTS_VIEW="$LOCALDATADIR/artists_view"
+  LOCALDATA_RELEASEGROUPS_VIEW="$LOCALDATADIR/releasegroups_view"
+  LOCALDATA_RELEASES_VIEW="$LOCALDATADIR/releases_view"
+  LOCALDATA_ARTISTS_LIST="$LOCALDATADIR/artists_list"
+  LOCALDATA_RELEASEGROUPS_LIST="$LOCALDATADIR/releasegroups_list"
+  LOCALDATA_RELEASES_LIST="$LOCALDATADIR/releases_list"
+  DECORATION_FILENAME=${DECORATION_FILENAME:-"mbid.json"}
+
+  export LOCALDATADIR LOCALDATA_ARTISTS LOCALDATA_RELEASEGROUPS \
+    LOCALDATA_RELEASES LOCALDATA_ARTISTS_VIEW LOCALDATA_RELEASEGROUPS_VIEW \
+    LOCALDATA_RELEASES_VIEW LOCALDATA_ARTISTS_LIST LOCALDATA_RELEASEGROUPS_LIST \
+    LOCALDATA_RELEASES_LIST DECORATION_FILENAME
+
+  export LOCAL_LOADED=1
+fi
+
+# Retrieve tags as json object from music file
+#
+# @argument $1: path to music file
+#
+# The tags retrieved are the MusicBrainz release ID and the MusicBrainz track
+# ID
+__gettags() {
   ffprobe -v error -show_entries format_tags -print_format json "$1" |
-    $JQ -r --compact-output '.format.tags | {
+    $JQ '.format.tags | {
       trackid: (."MusicBrainz Release Track Id" // ."MUSICBRAINZ_RELEASETRACKID" // ."MusicBrainz/Release Track Id" // ""),
       releaseid: (."MusicBrainz Album Id" // ."MUSICBRAINZ_ALBUMID" // ."MusicBrainz/Album Id" // "")
     }'
 }
 
-# Read music files in specified directory and create json file that points to
+# Decorate locally available music
-# all relevant MusicBrainz IDs.
+#
 # @input $1: Path to directory with album
+#
+# This methods reads the music files in the specified directory and writes a
+# json file that points to all relevant MusicBrainz IDs. If the directory
+# contains untagged files, or files of different releases, then the decoration
+# process will fail, and an error is printed.
 decorate() {
   if [ -f "$1/$DECORATION_FILENAME" ]; then
     info "Directory $1 has already been decorated (skipping)"
@@ -16,11 +53,11 @@ decorate() {
   fi
   decoration=$($JQ -n '.tracks = {}')
   tmpf=$(mktemp)
-  (cd "$1" && find . -type f -iname '*.mp3' -o -iname '*.mp4' -o -iname '*.flac' -o -iname '*.m4a') >"$tmpf"
+  (cd "$1" && find . -type f -iname '*.mp3' -o -iname '*.mp4' -o -iname '*.flac' -o -iname '*.m4a' -o -iname '*.ogg') >"$tmpf"
   while IFS= read -r f; do
-    mbid=$(gettags "$1/$f")
+    mbid=$(__gettags "$1/$f")
-    rid=$(echo "$mbid" | $JQ -r '.releaseid')
+    rid=$(echo "$mbid" | $JQ '.releaseid')
-    tid=$(echo "$mbid" | $JQ -r '.trackid')
+    tid=$(echo "$mbid" | $JQ '.trackid')
     if [ ! "$rid" ] || [ ! "$tid" ]; then
       err "File $f: Seems not tagged"
       releaseid=""
@@ -40,106 +77,175 @@ decorate() {
   done <"$tmpf"
   rm -f "$tmpf"
   if [ "$releaseid" ]; then
-    echo "$decoration" | $JQ --compact-output ".releaseid = \"$releaseid\"" >"$1/$DECORATION_FILENAME"
+    echo "$decoration" | $JQ ".releaseid = \"$releaseid\"" >"$1/$DECORATION_FILENAME"
   else
     return 1
   fi
 }
 
+# Decorate locally available music with specified MusicBrainz release
+#
+# @input $1: Path to directory with album
+# @input $2: MusicBrainz release ID
+#
+# Similar as `decorate`, but the MusicBrainz IDs are not inferred from the
+# tags, but passed as argument.
+decorate_as() {
+  if [ -f "$1/$DECORATION_FILENAME" ]; then
+    rid="$($JQ '.releaseid' "$1/$DECORATION_FILENAME")"
+    title="$(mb_release "$rid" | $JQ '.title // ""')"
+    artist="$(mb_release "$rid" | $JQ '."artist-credit" | map([.name, .joinphrase] | join("")) | join("")')"
+    [ "$rid" = "$2" ] &&
+      info "Directory $1 has already been decorated as the release '$title' - '$artist' with the identical MusicBrainz release ID." ||
+      info "Directory $1 has already been decorated as the release '$title' - '$artist' with the MusicBrainz release ID $rid."
+    while true; do
+      infonn "Do you want to redecorate $1? (yes/no)"
+      read -r yn
+      case $yn in
+      "yes") break ;;
+      "no") return 0 ;;
+      *) info "Please answer \"yes\" or \"no\"." ;;
+      esac
+    done
+  fi
+  # Print info
+  title="$(mb_release "$2" | $JQ '.title // ""')"
+  artist="$(mb_release "$2" | $JQ '."artist-credit" | map([.name, .joinphrase] | join("")) | join("")')"
+  info "Decorating $1 as the release $title by $artist"
+  # Start decoration
+  decoration=$($JQ -n '.tracks = {}')
+  tmpf=$(mktemp)
+  (cd "$1" && find . -type f -iname '*.mp3' -o -iname '*.mp4' -o -iname '*.flac' -o -iname '*.m4a' -o -iname '*.ogg' | sort) >"$tmpf"
+  # Compare number of tracks with release
+  rcnt="$(mb_release "$2" | $JQ '.media | map(."track-count") | add')"
+  dcnt="$(wc -l "$tmpf" | cut -d ' ' -f 1)"
+  if [ ! "$rcnt" -eq "$dcnt" ]; then
+    err "Number of tracks in directory ($dcnt) does not match number of tracks in release ($rcnt)."
+    return 1
+  fi
+  #
+  tmpj=$(mktemp)
+  mb_release "$2" |
+    $JQ '.media[] |
+    .position as $pos |
+    .tracks |
+    map({
+      $pos,
+      "id": .id,
+      "n": .number,
+      "t": .title
+    }) |
+    map(if(.n | type == "string" and test("^[0-9]+$")) then .n |= tonumber else . end) |
+    sort_by([.pos, .n])[] |
+    [.t, .id] |
+    join("\t")' >"$tmpj"
+  assocfile=$(mktemp)
+  awk -F '\t' '
+BEGIN { OFS = "\t" }
+FNR == NR { title[FNR] = $1; id[FNR] = $2 }
+FNR != NR { fname[FNR] = $1 }
+END { for (i in id) print title[i], id[i], fname[i] }
+' "$tmpj" "$tmpf" >"$assocfile"
+  rm -f "$tmpj" "$tmpf"
+  # Ask user if this is ok
+  info "We discovered the following associatoin:"
+  while IFS= read -r line; do
+    t="$(echo "$line" | cut -d "$(printf '\t')" -f 1)"
+    f="$(echo "$line" | cut -d "$(printf '\t')" -f 3)"
+    printf "Track '%s'\tFile '%s'\n" "$t" "$f"
+  done <"$assocfile" | column -t -s "$(printf '\t')"
+  while true; do
+    infonn "Are the track correctly associated to the audio files? (yes/no)"
+    read -r yn
+    case $yn in
+    "yes") break ;;
+    "no") return 0 ;;
+    *) info "Please answer \"yes\" or \"no\"." ;;
+    esac
+  done
+  # Construct decoration
+  decoration=$($JQ -n '.tracks = {}')
+  while IFS= read -r line; do
+    i="$(echo "$line" | cut -d "$(printf '\t')" -f 2)"
+    f="$(echo "$line" | cut -d "$(printf '\t')" -f 3)"
+    decoration=$(echo "$decoration" | $JQ ".tracks += {\"$i\": \"$f\"}")
+  done <"$assocfile"
+  echo "$decoration" | $JQ ".releaseid = \"$2\"" >"$1/$DECORATION_FILENAME"
+  return 0
+}
+
 # Load missing cache entries (batch mode)
+#
 # argument $1: type
-# argument $2: File with one ID per line
+#
+# This method reads one MusicBrainz IDs of the specified type from stdin (one
+# per line), and fetches the missing items.
 __batch_load_missing() {
   tmpf=$(mktemp)
-  while IFS= read -r mbid; do
+  cat |
-    if ! in_cache "$1" "$mbid"; then
+    cache_get_file_batch "$1" |
-      echo "$mbid" >>"$tmpf"
+    xargs \
-    fi
+      sh -c 'for f; do [ -e "$f" ] || echo "$f"; done' _ |
-  done <"$2"
+    cache_mbid_from_path_batch >"$tmpf"
-  if [ -s "$tmpf" ]; then
   lines=$(wc -l "$tmpf" | cut -d ' ' -f 1)
   if [ "$lines" -gt 0 ]; then
     case "$1" in
-      "$TYPE_ARTIST")
+    "$TYPE_ARTIST") tt="artists" ;;
-        tt="artists"
+    "$TYPE_RELEASEGROUP") tt="release groups" ;;
-        ;;
+    "$TYPE_RELEASE") tt="releases" ;;
-      "$TYPE_RELEASEGROUP")
-        tt="release groups"
-        ;;
-      "$TYPE_RELEASE")
-        tt="releases"
-        ;;
     esac
-      info "Fetching $lines missing $tt"
+    info "Fetching missing $tt"
     cnt=0
     while IFS= read -r mbid; do
       case "$1" in
       "$TYPE_ARTIST")
-          name=$(mb_artist "$mbid" | $JQ -r ".name")
+        name=$(mb_artist "$mbid" | $JQ '.name')
-          ;;
-        "$TYPE_RELEASEGROUP")
-          name=$(mb_releasegroup "$mbid" | $JQ -r ".title")
-          ;;
-        "$TYPE_RELEASE")
-          name=$(mb_release "$mbid" | $JQ -r ".title")
         ;;
+      "$TYPE_RELEASEGROUP") name=$(mb_releasegroup "$mbid" | $JQ '.title') ;;
+      "$TYPE_RELEASE") name=$(mb_release "$mbid" | $JQ '.title') ;;
       esac
       cnt=$((cnt + 1))
-        printf "\033[2K\r%d/%d (%s: %s)" "$cnt" "$lines" "$mbid" "$name"
+      info "$(printf "%d/%d (%s: %s)" "$cnt" "$lines" "$mbid" "$name")"
       sleep 1
     done <"$tmpf"
-      printf "\n"
-    fi
   fi
   rm -f "$tmpf"
 }
 
-LOCALDATADIR="$HOME/.cache/$APP_NAME/local"
+# Precompute lists
-LOCALDATA_ARTISTS="$LOCALDATADIR/artists"
+#
-LOCALDATA_RELEASEGROUPS="$LOCALDATADIR/releasegroups"
+# The main views (VIEW_ARTIST and TYPE_RELEASEGROUP) for locally available
-LOCALDATA_RELEASES="$LOCALDATADIR/releases"
+# music are theme dependent. These views are generated from the lists that are
-LOCALDATA_ARTISTS_VIEW="$LOCALDATADIR/artists_view"
+# produced with the present method. It contains all essential data, but in a
-LOCALDATA_RELEASEGROUPS_VIEW="$LOCALDATADIR/releasegroups_view"
+# theme-independent fashion. The lists are stored in the files
-LOCALDATA_RELEASES_VIEW="$LOCALDATADIR/releases_view"
+# `LOCALDATA_ARTISTS_LIST` and `LOCALDATA_RELEASEGROUPS_LIST`.
-DECORATION_FILENAME=${DECORATION_FILENAME:-"mbid.json"}
+__precompute_lists() {
-
+  cache_get_file_batch "$TYPE_ARTIST" <"$LOCALDATA_ARTISTS" | xargs \
-# Load local music
+    $JQ '[
-# argument $1: path to decorated music files
-load_local() {
-  [ -d "$LOCALDATADIR" ] || mkdir -p "$LOCALDATADIR"
-  tmpreleases=$(mktemp)
-  [ -f "$tmpreleases" ] || exit 1
-  info "Locating and parsing decoration files ($DECORATION_FILENAME)"
-  find "$1" -type f -name "$DECORATION_FILENAME" -print0 |
-    xargs -0 -P 4 $JQ -r '.releaseid+"\t"+input_filename' |
-    tee "$LOCALDATA_RELEASES" |
-    cut -d "$(printf '\t')" -f 1 >"$tmpreleases"
-  __batch_load_missing "$TYPE_RELEASE" "$tmpreleases"
-  # Get release groups and album artists
-  while IFS= read -r rid; do
-    mb=$(mb_release "$rid")
-    echo "$mb" | $JQ -r '."release-group".id' >>"$LOCALDATA_RELEASEGROUPS"
-    echo "$mb" | $JQ -r '."release-group"."artist-credit" | map(.artist.id) | join("\n")' >>"$LOCALDATA_ARTISTS"
-  done <"$tmpreleases"
-  tf=$(mktemp)
-  sort "$LOCALDATA_RELEASEGROUPS" | uniq >"$tf" && mv "$tf" "$LOCALDATA_RELEASEGROUPS"
-  sort "$LOCALDATA_ARTISTS" | uniq >"$tf" && mv "$tf" "$LOCALDATA_ARTISTS"
-  # Populate cache with missing data
-  __batch_load_missing "$TYPE_RELEASEGROUP" "$LOCALDATA_RELEASEGROUPS"
-  __batch_load_missing "$TYPE_ARTIST" "$LOCALDATA_ARTISTS"
-  rm -f "$tmpreleases"
-  # Precompute views
-  info "Precomputing artist view"
-  while IFS= read -r aid; do
-    mb_artist "$aid" | $JQ -r '[
       .id,
       .type,
       .name,
       .disambiguation,
       .["life-span"].begin,
       .["life-span"].end
-    ] | join("\t")'
+      ] | join("\t")' >"$LOCALDATA_ARTISTS_LIST"
-  done <"$LOCALDATA_ARTISTS" |
+  cache_get_file_batch "$TYPE_RELEASEGROUP" <"$LOCALDATA_RELEASEGROUPS" | xargs \
+    $JQ '[
+      .id,
+      ."primary-type",
+      (."secondary-types" // []|join(";")),
+      ."first-release-date",
+      .title,
+      (."artist-credit" | map(([.name, .joinphrase]|join(""))) | join(""))
+      ] | join("\t")' >"$LOCALDATA_RELEASEGROUPS_LIST"
+}
+
+# Precompute views
+#
+# This method injects the theme elements to the lists from `precompute_lists`.
+# The resulting views are stored in the files `LOCALDATA_ARTISTS_VIEW` and
+# `LOCALDATA_RELEASEGROUPS_VIEW`.
+precompute_views() {
   awk \
     -F "\t" \
     -v file_local_artists="${LOCALDATA_ARTISTS:-}" \
@@ -147,21 +253,11 @@ load_local() {
     -v format_group="$AV_GROUP" \
     -v format_disambiguation="$AV_DISAMBIGUATION" \
     -v format_local="$FORMAT_LOCAL" \
-      "$AWK_ARTISTS" |
+    "$AWK_ARTISTS" "$LOCALDATA_ARTISTS_LIST" |
     sort |
-    column -t -s "$(printf '\t')" |
+    column -t -s "$(printf '\t')" -l 2 >"$LOCALDATA_ARTISTS_VIEW"
-    sed 's| \+\([0-9a-f-]\+\)$|\t\1|' >"$LOCALDATA_ARTISTS_VIEW"
+  #column -t -s "$(printf '\t')" |
-  info "Precomputing releasegroup view"
+  #sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\)$|\t\1\t\2|' >"$LOCALDATA_ARTISTS_VIEW"
-  while IFS= read -r rgid; do
-    mb_releasegroup "$rgid" | $JQ -r '[
-    .id,
-    ."primary-type",
-    (."secondary-types" // []|join(";")),
-    ."first-release-date",
-    .title,
-    (."artist-credit" | map(([.name, .joinphrase]|join(""))) | join(""))
-    ] | join("\t")'
-  done <"$LOCALDATA_RELEASEGROUPS" |
   awk \
     -F "\t" \
     -v file_local_releasegroups="${LOCALDATA_RELEASEGROUPS:-}" \
@@ -188,60 +284,70 @@ load_local() {
     -v format_demo="$FORMAT_TYPE_SECONDARY_DEMO" \
     -v format_fieldrec="$FORMAT_TYPE_SECONDARY_FIELDREC" \
     -v format_local="$FORMAT_LOCAL" \
-      "$AWK_RELEASEGROUPS" |
+    "$AWK_RELEASEGROUPS" "$LOCALDATA_RELEASEGROUPS_LIST" | sort -n -r |
-    sort -n -r |
     cut -d "$(printf '\t')" -f 2- |
-    column -t -s "$(printf '\t')" |
+    column -t -s "$(printf '\t')" -l 5 >"$LOCALDATA_RELEASEGROUPS_VIEW"
-    sed 's| \+\([0-9a-f-]\+\)$|\t\1|' >"$LOCALDATA_RELEASEGROUPS_VIEW"
+  #column -t -s "$(printf '\t')" |
-  info "Precomputing release view"
+  #sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\)$|\t\1\t\2|' >"$LOCALDATA_RELEASEGROUPS_VIEW"
-  list_releases |
-    while IFS= read -r rid; do
-      mb_release "$rid" | $JQ -r '[
-      .id,
-      .status,
-      .date,
-      ."cover-art-archive".count,
-      (."label-info" | map(.label.name) | unique | join(", ")),
-      (.media | map(."track-count") | add),
-      (.media | map(.format) | unique | join(", ")),
-      .country,
-      .title,
-      (."artist-credit" | map(([.name, .joinphrase]|join(""))) | join(""))
-      ] | join("\t")'
-    done |
-    awk \
-      -F "\t" \
-      -v file_local_releases="${LOCALDATA_RELEASES:-}" \
-      -v release_official="$FORMAT_STATUS_OFFICIAL" \
-      -v release_promotion="$FORMAT_STATUS_PROMO" \
-      -v release_bootleg="$FORMAT_STATUS_BOOTLEG" \
-      -v release_pseudo="$FORMAT_STATUS_PSEUDO" \
-      -v release_withdrawn="$FORMAT_STATUS_WITHDRAWN" \
-      -v release_expunged="$FORMAT_STATUS_EXPUNGED" \
-      -v release_cancelled="$FORMAT_STATUS_CANCELLED" \
-      -v release_format="$RV_FORMAT" \
-      -v release_format_title_artist="$RV_TITLE_ARTIST" \
-      -v release_format_title="$RV_TITLE" \
-      -v release_format_artist="$RV_ARTIST" \
-      -v format_local="$FORMAT_LOCAL" \
-      "$AWK_RELEASES" |
-    sort -n -r |
-    cut -d "$(printf '\t')" -f 2- |
-    column -t -s "$(printf '\t')" |
-    sed 's| \+\([0-9a-f-]\+\):\(.*$\)$|\t\1\t\2|' >"$LOCALDATA_RELEASES_VIEW"
 }
 
-# List all releases
+# Load local music
-list_releases() {
+#
-  cut -d "$(printf '\t')" -f 1 "$LOCALDATA_RELEASES"
+# argument $1: path to decorated music files
+#
+# This method parses all decorations and generates a line-by-line database of
+# locally available artists, releases, and release groups. This data is stored
+# in the files `LOCALDATA_ARTISTS`, `LOCALDATA_RELEASES`, and
+# `LOCALDATA_RELEASEGROUPS`.
+reloaddb() {
+  rm -rf "$LOCALDATADIR"
+  mkdir -p "$LOCALDATADIR"
+  find "$1" -type f -name "$DECORATION_FILENAME" -print0 |
+    xargs -0 $JQ '.releaseid+"\t"+input_filename' >"$LOCALDATA_RELEASES"
+  # Get necessary metadata and setup lists
+  tmpreleases=$(mktemp)
+  cut -d "$(printf '\t')" -f 1 "$LOCALDATA_RELEASES" |
+    tee "$tmpreleases" |
+    __batch_load_missing "$TYPE_RELEASE"
+  tmpreleasefiles=$(mktemp)
+  cache_get_file_batch "$TYPE_RELEASE" <"$tmpreleases" >"$tmpreleasefiles"
+  xargs \
+    $JQ '."release-group".id' \
+    <"$tmpreleasefiles" >"$LOCALDATA_RELEASEGROUPS"
+  xargs \
+    $JQ '."release-group"."artist-credit" | map(.artist.id) | join("\n")' \
+    <"$tmpreleasefiles" >"$LOCALDATA_ARTISTS"
+  rm -f "$tmpreleases" "$tmpreleasefiles"
+  tf1=$(mktemp)
+  tf2=$(mktemp)
+  sort "$LOCALDATA_RELEASEGROUPS" | uniq >"$tf1"
+  mv "$tf1" "$LOCALDATA_RELEASEGROUPS"
+  sort "$LOCALDATA_ARTISTS" | uniq >"$tf2"
+  mv "$tf2" "$LOCALDATA_ARTISTS"
+  __batch_load_missing "$TYPE_RELEASEGROUP" <"$LOCALDATA_RELEASEGROUPS"
+  __batch_load_missing "$TYPE_ARTIST" <"$LOCALDATA_ARTISTS"
+  __precompute_lists
 }
 
-# List all release groups
+# Check if necessary cache files are present or not
-list_releasegroups() {
+#
-  cat "$LOCALDATA_RELEASEGROUPS"
+# This method returns a non-zero value if some cached file is required to exist
+# for the computation of the lists (and views). This does not include the
+# derivation of the MusicBrainz artist IDs and MusicBrainz release-group IDs
+# from the MusicBrainz releases (see the `reloaddb` method above).
+local_files_present() {
+  cache_get_file_batch "$TYPE_ARTIST" <"$LOCALDATA_ARTISTS" | xargs ls >/dev/null 2>&1 || return 1
+  cache_get_file_batch "$TYPE_RELEASEGROUP" <"$LOCALDATA_RELEASEGROUPS" | xargs ls >/dev/null 2>&1 || return 1
+  #cut -d "$(printf '\t')" -f 1 "$LOCALDATA_RELEASES" | cache_get_file_batch "$TYPE_RELEASE" | xargs ls >/dev/null 2>&1 || return 1
+  return 0
 }
 
-# List all album artists
+# Load missing files
-list_artists() {
+#
-  cat "$LOCALDATA_ARTISTS"
+# If missing files were detected with `local_files_present`, then these missing
+# files may be cached using the present method.
+load_missing_files() {
+  __batch_load_missing "$TYPE_ARTIST" <"$LOCALDATA_ARTISTS"
+  __batch_load_missing "$TYPE_RELEASEGROUP" <"$LOCALDATA_RELEASEGROUPS"
+  #cut -d "$(printf '\t')" -f 1 "$LOCALDATA_RELEASES" | __batch_load_missing "$TYPE_RELEASE"
 }

src/sh/log.sh

@@ -0,0 +1,32 @@
+# Logging methods
+#
+# The default log file is `LOGFILE`. In the future, this file may become
+# configurable.
+if [ ! "${LOG_LOADED:-}" ]; then
+  ERR="\033[38;5;196m"
+  INFO="\033[38;5;75m"
+  OFF="\033[m"
+  LOGDIR="$HOME/.local/state/$APP_NAME"
+  [ -d "$LOGDIR" ] || mkdir -p "$LOGDIR"
+  LOGFILE="$LOGDIR/log"
+  export ERR INFO OFF LOGFILE
+
+  export LOG_LOADED=1
+fi
+
+# Print an error message to stderr and log it incuding the time stamp and PID
+# to the log file.
+err() {
+  echo "$(date) [$$]>${ERR}ERROR:${OFF} ${1:-}" | tee -a "$LOGFILE" | cut -d ">" -f 2- >/dev/stderr
+}
+
+# Print information to stderr and log it incuding the time stamp and PID to the
+# log file.
+info() {
+  echo "$(date) [$$]>${INFO}Info:${OFF} ${1:-}" | tee -a "$LOGFILE" | cut -d ">" -f 2- >/dev/stderr
+}
+
+# Like `info` but without newlnes on stderr.
+infonn() {
+  echo "$(date) [$$]>${INFO}Info:${OFF} ${1:-}" | tee -a "$LOGFILE" | cut -d ">" -f 2- | tr '\n' ' ' >/dev/stderr
+}

src/sh/mb.sh

@@ -1,7 +1,13 @@
-# The only IDs uses here are MusicBrainz IDs
+# This files provides a high-level access to the MusicBrainz databse. The only
+# IDs used here are MusicBrainz IDs
 
-# Helper methods to retrieve from cache, if it exists, and otherwise populate
+# The following methods are local methods that combines the MusicBrainz API
-# cache and retrieve
+# with the caching methods.
+
+# Retrieve MusicBrainz data for artist from cache (if it exists), and otherwise
+# download it using the MusicBrainz API.
+#
+# @argument $1: MusicBrainz artist ID
 __mb_artist_cache_or_fetch() {
   if ! cache_get_artist "$1"; then
     api_mb_artist "$1" | cache_put_artist "$1"
@@ -9,6 +15,10 @@ __mb_artist_cache_or_fetch() {
   fi
 }
 
+# Retrieve MusicBrainz data for release group from cache (if it exists), and
+# otherwise download it using the MusicBrainz API.
+#
+# @argument $1: MusicBrainz release-group ID
 __mb_releasegroup_cache_or_fetch() {
   if ! cache_get_releasegroup "$1"; then
     api_mb_releasegroup "$1" | cache_put_releasegroup "$1"
@@ -16,6 +26,10 @@ __mb_releasegroup_cache_or_fetch() {
   fi
 }
 
+# Retrieve MusicBrainz data for release from cache (if it exists), and
+# otherwise download it using the MusicBrainz API.
+#
+# @argument $1: MusicBrainz release ID
 __mb_release_cache_or_fetch() {
   if ! cache_get_release "$1"; then
     api_mb_release "$1" | cache_put_release "$1"
@@ -23,11 +37,15 @@ __mb_release_cache_or_fetch() {
   fi
 }
 
+# Retrieve MusicBrainz data for release groups of given artist from cache (if
+# it exists), and otherwise download it using the MusicBrainz API.
+#
+# @argument $1: MusicBrainz artist ID
 __mb_artist_cache_or_fetch_releasegroups() {
   if ! cache_get_artist_releasegroups "$1"; then
     api_mb_browse_artist_releasegroups "$1" | cache_put_artist_releasegroups "$1"
     rg="$(cache_get_artist_releasegroups "$1")"
-    total=$(printf "%s" "$rg" | $JQ -r '."release-group-count"')
+    total=$(printf "%s" "$rg" | $JQ '."release-group-count"')
     seen=$MB_BROWSE_STEPS
     while [ "$total" -gt "$seen" ]; do
       # Fetch remaning release groups, and append to cache
@@ -39,11 +57,15 @@ __mb_artist_cache_or_fetch_releasegroups() {
   fi
 }
 
+# Retrieve MusicBrainz data for releases of given release group from cache (if
+# it exists), and otherwise download it using the MusicBrainz API.
+#
+# @argument $1: MusicBrainz release-group ID
 __mb_releasegroup_cache_or_fetch_releases() {
   if ! cache_get_releasegroup_releases "$1"; then
     api_mb_browse_releasegroup_releases "$1" | cache_put_releasegroup_releases "$1"
     releases="$(cache_get_releasegroup_releases "$1")"
-    total=$(printf "%s" "$releases" | $JQ -r '."release-count"')
+    total=$(printf "%s" "$releases" | $JQ '."release-count"')
     seen=$MB_BROWSE_STEPS
     while [ "$total" -gt "$seen" ]; do
       # Fetch remaning releases, and append to cache
@@ -55,18 +77,22 @@ __mb_releasegroup_cache_or_fetch_releases() {
   fi
 }
 
-# Get MusicBrainz json for artist
+# The following methods provide the external interface
-# @argument $1: MusicBrainz Artist ID
+
+# Retrieve MusicBrainz data for artist
+#
+# @argument $1: MusicBrainz artist ID
 mb_artist() {
   __mb_artist_cache_or_fetch "$1"
 }
 
-# Get Wikidata json for artist
+# Retrieve Wikidata data for artist
-# @argument $1: MusicBrainz Artist ID
+#
+# @argument $1: MusicBrainz artist ID
 mb_artist_wikidata() {
   if ! cache_get_artist_wikidata "$1"; then
     wikidataid=$(mb_artist "$1" |
-      $JQ -r '.relations |
+      $JQ '.relations |
       map(select(.type=="wikidata")) |
       .[0].url.resource // ""' |
       awk -F "/" '{print $NF}')
@@ -76,8 +102,9 @@ mb_artist_wikidata() {
   fi
 }
 
-# Get Wikipedia (English) summary json for artist
+# Retrieve Wikipedia (English) summary json for artist
-# @argument $1: MusicBrainz Artist ID
+#
+# @argument $1: MusicBrainz artist ID
 mb_artist_enwikipedia() {
   if ! cache_get_artist_enwikipedia "$1"; then
     # To fetch the wikipedia data, we need the wikipedia URL
@@ -89,7 +116,7 @@ mb_artist_enwikipedia() {
     # take the second route.
     wikidata=$(mb_artist_wikidata "$1" || true)
     wikiid=$(printf "%s" "$wikidata" |
-      $JQ -r '.enwiki.url // ""' |
+      $JQ '.enwiki.url // ""' |
       awk -F "/" '{print $NF}')
     [ ! "$wikiid" ] && return
     api_wikipedia_en_summary "$wikiid" | cache_put_artist_enwikipedia "$1"
@@ -97,12 +124,13 @@ mb_artist_enwikipedia() {
   fi
 }
 
-# Get Discogs json for artist
+# Retrieve  Discogs json for artist
-# @argument $1: MusicBrainz Artist ID
+#
+# @argument $1: MusicBrainz artist ID
 mb_artist_discogs() {
   if ! cache_get_artist_discogs "$1"; then
     discogsid=$(mb_artist "$1" |
-      $JQ -r '.relations |
+      $JQ '.relations |
       map(select(.type=="discogs")) |
       .[0].url.resource // ""' |
       awk -F "/" '{print $NF}')
@@ -112,22 +140,131 @@ mb_artist_discogs() {
   fi
 }
 
-# Get release-groups json for artist
+# Retrieve release groups for artist
-# @argument $1: MusicBrainz Artist ID
+#
+# @argument $1: MusicBrainz artist ID
 mb_artist_releasegroups() {
   __mb_artist_cache_or_fetch_releasegroups "$1"
 }
 
-# Get MusicBrainz json for release group
+# Retrieve MusicBrainz release group
-# @argument $1: MusicBrainz Release-Group ID
+#
+# @argument $1: MusicBrainz release-group ID
 mb_releasegroup() {
   __mb_releasegroup_cache_or_fetch "$1"
 }
 
+# Retrieve MusicBrainz releases of release group
+#
+# @argument $1: MusicBrainz release-group ID
 mb_releasegroup_releases() {
   __mb_releasegroup_cache_or_fetch_releases "$1"
 }
 
+# Retrieve MusicBrainz release
+#
+# @argument $1: MusicBrainz release ID
 mb_release() {
   __mb_release_cache_or_fetch "$1"
 }
+
+# Reload hook that is used after a change in the query (when searching
+# MusicBrainz).
+#
+# This method waits for the search to complete, then it parses the search
+# results and prints them.
+mb_results_async() {
+  # Wait for async. process to terminate
+  sleep 1
+  while [ -f "$LOCKFILE" ]; do
+    sleep 1
+  done
+  # Show results
+  column -t -s "$(printf '\t')" "$RESULTS" |
+    sed 's| \+\([0-9a-f-]\+\) \+\([0-9a-f-]\+\)$|\t\1\t\2|'
+}
+
+# Initiate search on MusicBrainz
+#
+# @argument $1: view
+#
+# This methods initiates an asynchronous search for both views
+# (VIEW_SEARCH_ARTIST and VIEW_SEARCH_ALBUM). If a running query is detected,
+# that one is killed first. The search results are then stored and become
+# retrievable using `mb_results_async`.
+mb_search_async() {
+  view="$1"
+  # Kill any running search
+  if [ -f "$PIDFILE" ]; then
+    pid=$(cat "$PIDFILE")
+    rm -f "$PIDFILE"
+    kill -9 "$pid" >/dev/null 2>&1 || true
+  fi
+  # Stop, if no search string is given
+  [ "$FZF_QUERY" ] || exit 0
+  # Store PID of current process
+  echo "$$" >"$PIDFILE"
+  touch "$LOCKFILE"
+  sleep 1
+  if [ "$view" = "$VIEW_SEARCH_ARTIST" ]; then
+    api_mb_search_artist "$FZF_QUERY" |
+      $JQ '.artists[] | [
+    .id,
+    .type,
+    .name,
+    .disambiguation,
+    .["life-span"].begin,
+    .["life-span"].end
+    ] | join("\t")' |
+      awk \
+        -F "\t" \
+        -v file_local_artists="${LOCALDATA_ARTISTS:-}" \
+        -v format_person="$AV_PERSON" \
+        -v format_group="$AV_GROUP" \
+        -v format_disambiguation="$AV_DISAMBIGUATION" \
+        -v format_local="$FORMAT_LOCAL" \
+        "$AWK_ARTISTS" >"$RESULTS" ||
+      true
+  else
+    api_mb_search_releasegroup "$FZF_QUERY" |
+      $JQ '."release-groups"[] | [
+    .id,
+    ."primary-type",
+    (."secondary-types" // []|join(";")),
+    ."first-release-date",
+    .title,
+    (."artist-credit" | map(([.name, .joinphrase]|join(""))) | join(""))
+    ] | join("\t")' |
+      awk \
+        -F "\t" \
+        -v file_local_releasegroups="${LOCALDATA_RELEASEGROUPS:-}" \
+        -v format_release="$RGV_RELEASE" \
+        -v format_release_w_artist="$RGV_RELEASE_W_ARTIST" \
+        -v format_year="$RGV_YEAR" \
+        -v format_album="$FORMAT_TYPE_ALBUM" \
+        -v format_single="$FORMAT_TYPE_SINGLE" \
+        -v format_ep="$FORMAT_TYPE_EP" \
+        -v format_broadcast="$FORMAT_TYPE_BROADCAST" \
+        -v format_other="$FORMAT_TYPE_OTHER" \
+        -v format_has_secondary="$FORMAT_TYPE_HAS_SECONDARY" \
+        -v format_secondary="$FORMAT_TYPE_SECONDARY" \
+        -v format_compilation="$FORMAT_TYPE_SECONDARY_COMPILATION" \
+        -v format_soundtrack="$FORMAT_TYPE_SECONDARY_SOUNDTRACK" \
+        -v format_spokenword="$FORMAT_TYPE_SECONDARY_SPOKENWORD" \
+        -v format_interview="$FORMAT_TYPE_SECONDARY_INTERVIEW" \
+        -v format_audiobook="$FORMAT_TYPE_SECONDARY_AUDIOBOOK" \
+        -v format_audiodrama="$FORMAT_TYPE_SECONDARY_AUDIODRAMA" \
+        -v format_live="$FORMAT_TYPE_SECONDARY_LIVE" \
+        -v format_remix="$FORMAT_TYPE_SECONDARY_REMIX" \
+        -v format_djmix="$FORMAT_TYPE_SECONDARY_DJMIX" \
+        -v format_mixtape="$FORMAT_TYPE_SECONDARY_MIXTAPE" \
+        -v format_demo="$FORMAT_TYPE_SECONDARY_DEMO" \
+        -v format_fieldrec="$FORMAT_TYPE_SECONDARY_FIELDREC" \
+        -v format_local="$FORMAT_LOCAL" \
+        "$AWK_RELEASEGROUPS" |
+      cut -d "$(printf '\t')" -f 2- >"$RESULTS" ||
+      true
+  fi
+  # Process ends now: Display and quit
+  rm -f "$LOCKFILE" "$PIDFILE"
+}

src/sh/mpv.sh

@@ -0,0 +1,162 @@
+# Interface to the mpv music player. This interface communicates to an mpv
+# instance through the socket `MPV_SOCKET`.
+
+# Internal helper method to send a command without arguments to mpv
+#
+# @argument $1: command
+__mpv_command() {
+  printf "{ \"command\": [\"%s\"] }\n" "$1" | $SOCAT - "$MPV_SOCKET"
+}
+
+# Internal helper method to send a command with a single argument to mpv
+#
+# @argument $1: command
+# @argument $2: argument
+__mpv_command_with_arg() {
+  printf "{ \"command\": [\"%s\", \"%s\"] }\n" "$1" "$2" | $SOCAT - "$MPV_SOCKET"
+}
+
+# Internal helper method to send a command with two arguments to mpv
+#
+# @argument $1: command
+# @argument $2: argument 1
+# @argument $3: argument 2
+__mpv_command_with_args2() {
+  printf "{ \"command\": [\"%s\", \"%s\", \"%s\"] }\n" "$1" "$2" "$3" | $SOCAT - "$MPV_SOCKET"
+}
+
+# Internal helper method to resolve mpv variables
+#
+# @argument $1: mpv expression
+__mpv_get() {
+  __mpv_command_with_arg "expand-text" "$1" | $JQ '.data'
+}
+
+# Get the total number of tracks in the playlist
+mpv_playlist_count() {
+  __mpv_get '${playlist-count}'
+}
+
+# Get the position of the current track in the playlist (0 based)
+mpv_playlist_position() {
+  __mpv_get '${playlist-pos}'
+}
+
+# Move track on playlist
+#
+# @argument $1: track index 1
+# @argument $2: track index 2
+#
+# Moves the track at the first index to the position of the track of the second
+# index. Also here, indices are 0 based.
+mpv_playlist_move() {
+  __mpv_command_with_args2 "playlist-move" "$1" "$2" >>/tmp/foo
+}
+
+# Remove all tracks from the playlist
+mpv_playlist_clear() {
+  __mpv_command "playlist-clear"
+}
+
+# Randomly shuffle the order of the tracks in the playlist
+mpv_playlist_shuffle() {
+  __mpv_command "playlist-shuffle"
+}
+
+# Revert a previously shuffle command
+#
+# This method works only for a first shuffle.
+mpv_playlist_unshuffle() {
+  __mpv_command "playlist-unshuffle"
+}
+
+# Quit the mpv instance bound to the socket `MPV_SOCKET`
+mpv_quit() {
+  __mpv_command "quit"
+}
+
+# Start an mpv instance and bind it to the socket `MPV_SOCKET`
+mpv_start() {
+  MPV_SOCKET="$(mktemp --suffix=.sock)"
+  trap 'mpv_quit >/dev/null; rm -f "$MPV_SOCKET"' EXIT INT
+  $MPV --no-config --no-terminal --input-ipc-server="$MPV_SOCKET" --idle --no-osc --no-input-default-bindings &
+}
+
+# Play the track at the specified index in the playlist
+#
+# @argument $1: index (0 based)
+mpv_play_index() {
+  __mpv_command_with_arg "playlist-play-index" "$1"
+}
+
+# Remove the track at the specified index from the playlist
+#
+# @argument $1: index (0 based)
+mpv_rm_index() {
+  __mpv_command_with_arg "playlist-remove" "$1"
+}
+
+# Load the playlist with the specified list, and start playing
+#
+# This method reads from stdin a playlist file, e.g., a .m3u file.
+mpv_play_list() {
+  t=$(mktemp)
+  cat >"$t"
+  __mpv_command_with_arg "loadlist" "$t"
+  rm -f "$t"
+}
+
+# Append the playlist with the specified list, and start playing
+#
+# This method reads from stdin a playlist file, e.g., a .m3u file.
+mpv_queue_list() {
+  t=$(mktemp)
+  cat >"$t"
+  __mpv_command_with_args2 "loadlist" "$t" "append-play"
+  rm -f "$t"
+}
+
+# Insert the playlist with the specified list as the next item, and start
+# playing
+#
+# This method reads from stdin a playlist file, e.g., a .m3u file.
+mpv_queue_next_list() {
+  t=$(mktemp)
+  cat >"$t"
+  pos=$(mpv_playlist_position)
+  cnt1=$(mpv_playlist_count)
+  __mpv_command_with_args2 "loadlist" "$t" "append-play"
+  rm -f "$t"
+  cnt2=$(mpv_playlist_count)
+  diff=$((cnt2 - cnt1))
+  [ "$diff" -gt 0 ] || return
+  # Move added items right after current item (numbers are 0 based)
+  for i in $(seq "$diff"); do
+    mpv_playlist_move $((cnt1 + i - 1)) $((pos + i))
+  done
+}
+
+# Play next track on playlist
+mpv_next() {
+  __mpv_command "playlist-next"
+}
+
+# Play previous track on playlist
+mpv_prev() {
+  __mpv_command "playlist-prev"
+}
+
+# Seek forward by 10 seconds
+mpv_seek_forward() {
+  __mpv_command_with_arg "seek" "10"
+}
+
+# Seek backward by 10 seconds
+mpv_seek_backward() {
+  __mpv_command_with_arg "seek" "-10"
+}
+
+# Pause if mpv plays, and play if it is paused
+mpv_toggle_pause() {
+  __mpv_command_with_arg "cycle" "pause"
+}

src/sh/playback.sh

@@ -0,0 +1,138 @@
+# Playback tools and helper
+#
+# The methods to control the mpv instance are in `src/sh/mpv.sh`. Here,
+# a higher-level playback functionality is provided.
+
+# Available playback commands
+if [ ! "${PLAYBACK_LOADED:-}" ]; then
+  PLAYBACK_CMD_PLAY="play"
+  PLAYBACK_CMD_QUEUE="queue"
+  PLAYBACK_CMD_QUEUE_NEXT="queue-next"
+  PLAYBACK_CMD_TOGGLE_PLAYBACK="toggle"
+  PLAYBACK_CMD_PLAY_NEXT="next"
+  PLAYBACK_CMD_PLAY_PREV="prev"
+  PLAYBACK_CMD_SEEK_FORWARD="seekf"
+  PLAYBACK_CMD_SEEK_BACKWARD="seekb"
+  export PLAYBACK_CMD_PLAY PLAYBACK_CMD_QUEUE PLAYBACK_CMD_QUEUE_NEXT \
+    PLAYBACK_CMD_TOGGLE_PLAYBACK PLAYBACK_CMD_PLAY_NEXT \
+    PLAYBACK_CMD_PLAY_PREV PLAYBACK_CMD_SEEK_FORWARD PLAYBACK_CMD_SEEK_BACKWARD
+
+  export PLAYBACK_LOADED=1
+fi
+
+# Obtain playback command from key press
+#
+# @argument $1: key
+__playback_cmd_from_key() {
+  key=$1
+  case ",$KEYS_PLAY," in *",$key,"*) echo "$PLAYBACK_CMD_PLAY" && return ;; esac
+  case ",$KEYS_N_PLAY," in *",$key,"*) echo "$PLAYBACK_CMD_PLAY" && return ;; esac
+  case ",$KEYS_QUEUE," in *",$key,"*) echo "$PLAYBACK_CMD_QUEUE" && return ;; esac
+  case ",$KEYS_N_QUEUE," in *",$key,"*) echo "$PLAYBACK_CMD_QUEUE" && return ;; esac
+  case ",$KEYS_QUEUE_NEXT," in *",$key,"*) echo "$PLAYBACK_CMD_QUEUE_NEXT" && return ;; esac
+  case ",$KEYS_N_QUEUE_NEXT," in *",$key,"*) echo "$PLAYBACK_CMD_QUEUE_NEXT" && return ;; esac
+  case ",$KEYS_TOGGLE_PLAYBACK," in *",$key,"*) echo "$PLAYBACK_CMD_TOGGLE_PLAYBACK" && return ;; esac
+  case ",$KEYS_N_TOGGLE_PLAYBACK," in *",$key,"*) echo "$PLAYBACK_CMD_TOGGLE_PLAYBACK" && return ;; esac
+  case ",$KEYS_PLAY_NEXT," in *",$key,"*) echo "$PLAYBACK_CMD_PLAY_NEXT" && return ;; esac
+  case ",$KEYS_N_PLAY_NEXT," in *",$key,"*) echo "$PLAYBACK_CMD_PLAY_NEXT" && return ;; esac
+  case ",$KEYS_PLAY_PREV," in *",$key,"*) echo "$PLAYBACK_CMD_PLAY_PREV" && return ;; esac
+  case ",$KEYS_N_PLAY_PREV," in *",$key,"*) echo "$PLAYBACK_CMD_PLAY_PREV" && return ;; esac
+  case ",$KEYS_SEEK_FORWARD," in *",$key,"*) echo "$PLAYBACK_CMD_SEEK_FORWARD" && return ;; esac
+  case ",$KEYS_N_SEEK_FORWARD," in *",$key,"*) echo "$PLAYBACK_CMD_SEEK_FORWARD" && return ;; esac
+  case ",$KEYS_SEEK_BACKWARD," in *",$key,"*) echo "$PLAYBACK_CMD_SEEK_BACKWARD" && return ;; esac
+  case ",$KEYS_N_SEEK_BACKWARD," in *",$key,"*) echo "$PLAYBACK_CMD_SEEK_BACKWARD" && return ;; esac
+}
+
+# Generate playlist from MB release ID and path to decoration
+#
+# @argument $1: MusicBrainz release ID
+# @argument $2: Path to decoration file
+# @argument $3: MusicBrainz track ID to select (optional)
+__generate_playlist() {
+  printf "#EXTM3U\n"
+  dir="$(dirname "$2")"
+  mb_release "$1" |
+    $JQ \
+      --slurpfile decofile "$2" \
+      --arg base "$dir" \
+      --arg deco "$2" \
+      --arg tid "${3:-}" \
+      '$decofile[].tracks as $filenames |
+        . |
+        .id as $rid |
+        .media[] |
+        .position as $pos |
+        .tracks |
+        if ($tid == "") then . else map(select(.id == $tid)) end |
+        map({
+          t: [
+          $rid,
+          .id,
+          $pos,
+          .number,
+          .length,
+          .title,
+          (."artist-credit" | map([.name, .joinphrase] | join("")) | join("")),
+          $deco
+          ] | join("\t"),
+          length: (.length // 0 / 1000 | round | tostring),
+          $pos,
+          number: .number,
+          file: $filenames[.id]
+        }) |
+        map(if(.number | type == "string" and test("^[0-9]+$")) then .number |= tonumber else . end) |
+        sort_by([.pos, .number]) |
+        map("#EXTINF:" + .length + "," + .t + "\n" + $base + "/" + .file)[]'
+}
+
+# Main playback method
+#
+# @argument $1: view
+# @argument $2: MusicBrainz ID of current object
+# @argument $3: MusicBrainz ID of selected object
+# @argument $4: Path to decoration file
+#
+# This option controls the mpv instance via a key pressed in fzf. The key
+# pressed is stored in the environment variable FZF_KEY and is resolved to
+# the playback command through the method `__playback_cmd_from_key`.
+playback() {
+  view=${1:-}
+  mbid_current="${2:-}"
+  mbid="${3:-}"
+  path="${4:-}"
+  pbcmd=$(__playback_cmd_from_key "$FZF_KEY")
+  case "$pbcmd" in
+  "$PLAYBACK_CMD_PLAY")
+    [ "$path" ] || exit 0
+    case "$view" in
+    "$VIEW_ARTIST" | "$VIEW_SEARCH_ARTIST" | "$VIEW_SEARCH_ALBUM" | "$VIEW_LIST_ARTISTS" | "$VIEW_LIST_ALBUMS") info "not implemented" ;;
+    "$VIEW_RELEASEGROUP") __generate_playlist "$mbid" "$path" | mpv_play_list >/dev/null ;;
+    "$VIEW_RELEASE") __generate_playlist "$mbid_current" "$path" "$mbid" | mpv_play_list >/dev/null ;;
+    "$VIEW_PLAYLIST") mpv_play_index $((FZF_POS - 1)) >/dev/null ;;
+    esac
+    ;;
+  "$PLAYBACK_CMD_QUEUE")
+    [ "$path" ] || exit 0
+    case "$view" in
+    "$VIEW_ARTIST" | "$VIEW_SEARCH_ARTIST" | "$VIEW_SEARCH_ALBUM" | "$VIEW_LIST_ARTISTS" | "$VIEW_LIST_ALBUMS") info "not implemented" ;;
+    "$VIEW_RELEASEGROUP") __generate_playlist "$mbid" "$path" | mpv_queue_list >/dev/null ;;
+    "$VIEW_RELEASE") __generate_playlist "$mbid_current" "$path" "$mbid" | mpv_queue_list >/dev/null ;;
+    "$VIEW_PLAYLIST") __generate_playlist "$mbid_current" "$path" "$mbid" | mpv_queue_list >/dev/null ;;
+    esac
+    ;;
+  "$PLAYBACK_CMD_QUEUE_NEXT")
+    [ "$path" ] || exit 0
+    case "$view" in
+    "$VIEW_ARTIST" | "$VIEW_SEARCH_ARTIST" | "$VIEW_SEARCH_ALBUM" | "$VIEW_LIST_ARTISTS" | "$VIEW_LIST_ALBUMS") info "not implemented" ;;
+    "$VIEW_RELEASEGROUP") __generate_playlist "$mbid" "$path" | mpv_queue_next_list >/dev/null ;;
+    "$VIEW_RELEASE") __generate_playlist "$mbid_current" "$path" "$mbid" | mpv_queue_next_list >/dev/null ;;
+    "$VIEW_PLAYLIST") __generate_playlist "$mbid_current" "$path" "$mbid" | mpv_queue_next_list >/dev/null ;;
+    esac
+    ;;
+  "$PLAYBACK_CMD_TOGGLE_PLAYBACK") mpv_toggle_pause ;;
+  "$PLAYBACK_CMD_PLAY_NEXT") mpv_next ;;
+  "$PLAYBACK_CMD_PLAY_PREV") mpv_prev ;;
+  "$PLAYBACK_CMD_SEEK_FORWARD") mpv_seek_forward ;;
+  "$PLAYBACK_CMD_SEEK_BACKWARD") mpv_seek_backward ;;
+  esac
+}

src/sh/playlist.sh

@@ -0,0 +1,47 @@
+# Playlist manipulation
+#
+# This files provides an interface to manipulate the playlist. The available
+# commands are defined in the following variables.
+if [ ! "${PLAYLIST_LOADED:-}" ]; then
+  PLAYLIST_CMD_REMOVE="rm"
+  PLAYLIST_CMD_UP="up"
+  PLAYLIST_CMD_DOWN="down"
+  PLAYLIST_CMD_CLEAR="clear"
+  PLAYLIST_CMD_CLEAR_ABOVE="clear-above"
+  PLAYLIST_CMD_CLEAR_BELOW="clear-below"
+  PLAYLIST_CMD_SHUFFLE="shuffle"
+  PLAYLIST_CMD_UNSHUFFLE="unshuffle"
+  export PLAYLIST_CMD_REMOVE PLAYLIST_CMD_UP PLAYLIST_CMD_DOWN \
+    PLAYLIST_CMD_CLEAR PLAYLIST_CMD_CLEAR_ABOVE PLAYLIST_CMD_CLEAR_BELOW \
+    PLAYLIST_CMD_SHUFFLE PLAYLIST_CMD_UNSHUFFLE
+
+  export PLAYLIST_LOADED=1
+fi
+
+# Run playback commands
+#
+# @argument $1: playlist command
+#
+# This is a wrapper to execute mpv commands.
+playlist() {
+  case "$1" in
+  "$PLAYLIST_CMD_REMOVE") mpv_rm_index $((FZF_POS - 1)) ;;
+  "$PLAYLIST_CMD_UP") mpv_playlist_move $((FZF_POS - 1)) $((FZF_POS - 2)) ;;
+  "$PLAYLIST_CMD_DOWN") mpv_playlist_move $((FZF_POS - 0)) $((FZF_POS - 1)) ;;
+  "$PLAYLIST_CMD_CLEAR") mpv_playlist_clear ;;
+  "$PLAYLIST_CMD_CLEAR_ABOVE")
+    for _ in $(seq "$FZF_POS"); do
+      mpv_rm_index 0
+    done
+    ;;
+  "$PLAYLIST_CMD_CLEAR_BELOW")
+    cnt=$(mpv_playlist_count)
+    rem=$((cnt - FZF_POS + 1))
+    for _ in $(seq "$rem"); do
+      mpv_rm_index $((FZF_POS - 1))
+    done
+    ;;
+  "$PLAYLIST_CMD_SHUFFLE") mpv_playlist_shuffle ;;
+  "$PLAYLIST_CMD_UNSHUFFLE") mpv_playlist_unshuffle ;;
+  esac
+}

src/sh/preview.sh

@@ -1,18 +1,27 @@
+# Preview methods
+#
+# For now, only artist previews are supported.
+
+# This internal method reshapes the text to be shown in the preview. This
+# creates a border on both horizontal ends.
+#
+# The text is read from stdin.
 __shape() {
   cat | tr -d '\r' | fold -s -w "$((FZF_PREVIEW_COLUMNS - 4))" | awk '{print "  "$0"  "}'
 }
 
 # Print preview of artist
-# @input $1: MusicBrainz Artist ID
+#
-__preview_artist() {
+# @input $1: MusicBrainz artist ID
-  desc=$(mb_artist_enwikipedia "$1" | $JQ -r '.extract' | __shape)
+preview_artist() {
-  [ "$desc" ] || desc=$(mb_artist_discogs "$1" | $JQ -r '.profile' | sed 's/\[a=\([^]]*\)\]/\1/g' | __shape)
+  desc=$(mb_artist_enwikipedia "$1" | $JQ '.extract' | __shape)
-  if [ "$(mb_artist "$1" | $JQ -r '.type')" = "Person" ]; then
+  [ "$desc" ] || desc=$(mb_artist_discogs "$1" | $JQ '.profile' | sed 's/\[a=\([^]]*\)\]/\1/g' | __shape)
+  if [ "$(mb_artist "$1" | $JQ '.type')" = "Person" ]; then
     # Show birth place and death place of person
-    lsb=$(mb_artist "$1" | $JQ -r '."life-span".begin // ""' | head -c 4)
+    lsb=$(mb_artist "$1" | $JQ '."life-span".begin // ""' | head -c 4)
-    lse=$(mb_artist "$1" | $JQ -r '."life-span".end // ""' | head -c 4)
+    lse=$(mb_artist "$1" | $JQ '."life-span".end // ""' | head -c 4)
-    ab=$(mb_artist "$1" | $JQ -r '."begin-area".name // ""')
+    ab=$(mb_artist "$1" | $JQ '."begin-area".name // ""')
-    ae=$(mb_artist "$1" | $JQ -r '."end-area".name // ""')
+    ae=$(mb_artist "$1" | $JQ '."end-area".name // ""')
     if [ "$lsb" ] && [ "$ab" ]; then
       begin=$(printf "$APV_DATEPLACE" "$lsb" "$ab")
     elif [ "$lsb" ]; then
@@ -37,3 +46,8 @@ __preview_artist() {
   #link=$(printf "More info:\033]8;;%s\033\\ %s\033]8;;\033\\" "https://musicbrainz.org/" "[MusicBrainz]")
   printf "$APV_FORMAT" "$desc" "${lifespan:-}"
 }
+
+# Print message if there is nothing to be shown
+preview_nothing() {
+  echo "No preview available."
+}

src/sh/query.sh

@@ -0,0 +1,160 @@
+# The default queries depend on the current view, and are usually derived from
+# the theme. Nevertheless, they may be overwritten with the configuration file.
+# Note that filters are not used in the views VIEW_SEARCH_ARTIST and
+# VIEW_SEARCH_ALBUM. The reason for this is that in those modes, changing the
+# query string triggers a search on the MusicBrainz website (the input is not a
+# filter, but a query).
+#
+# The keybinding KEYS_FILTER_LOCAL triggers a filter of QUERY_LOCAL in the
+# views VIEW_ARTIST, VIEW_RELEASEGROUP, and VIEW_RELEASE only. Here, it is only
+# possible to adjust QUERY_LOCAL via the configuration. The keybinding KEYS_FILTER_0
+# resets the query. F_1_.. filters are the default filters when the respective
+# view is entered. For all other keys, the filters are individually
+# configurable, by specifying e.g., F_3_VIEW_LIST_ALBUMS.
+#
+# Derived queries
+# To derive the queries from the theme, we must perform some steps: 1) remove
+# colors, and 2) escape white spaces. This is implemented in the method
+# `__clean_filter`.
+#
+# List of derived queries:
+# - QUERY_LOCAL: Hide items that are not locally available
+# - q_has_secondary: Release groups with secondary types
+# - q_album: Release group is of type Album
+# - q_ep: Release group is of type EP
+# - q_single: Release group is of type single
+# - q_official: Release is official
+
+# Clean a filter string
+#
+# This method reads from stdin a string and removes all colors and escapes
+# white spaces.
+__clean_filter() {
+  cat | sed "s/${ESC}\[[0-9;]*[mK]//g" | sed "s/ /\\\ /g"
+}
+
+# Determine preset query
+#
+# @argument $1: Current view
+# @argument $2: Key pressed (optional)
+#
+# If the key is not given, then the F_1_.. query is used for the respective
+# view, i.e, its as if a key from KEYS_FILTER_1 has been pressed.
+default_query() {
+  view=$1
+  key="${2:-"$(echo "$KEYS_FILTER_1" | cut -d ',' -f 1)"}"
+  case ",$KEYS_FILTER_LOCAL," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST" | "$VIEW_RELEASEGROUP" | "$VIEW_RELEASE") echo "$QUERY_LOCAL" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_1," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_1_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_1_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_1_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_1_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_1_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_2," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_2_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_2_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_2_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_2_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_2_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_3," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_3_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_3_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_3_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_3_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_3_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_4," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_4_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_4_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_4_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_4_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_4_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_5," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_5_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_5_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_5_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_5_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_5_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_6," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_6_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_6_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_6_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_6_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_6_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_7," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_7_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_7_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_7_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_7_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_7_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_8," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_8_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_8_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_8_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_8_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_8_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  case ",$KEYS_FILTER_9," in
+  *",$key,"*)
+    case "$view" in
+    "$VIEW_ARTIST") echo "$F_9_VIEW_ARTIST" ;;
+    "$VIEW_RELEASEGROUP") echo "$F_9_VIEW_RELEASEGROUP" ;;
+    "$VIEW_RELEASE") echo "$F_9_VIEW_RELEASE" ;;
+    "$VIEW_LIST_ARTISTS") echo "$F_9_LIST_ARTISTS" ;;
+    "$VIEW_LIST_ALBUMS") echo "$F_9_LIST_ALBUMS" ;;
+    esac
+    ;;
+  esac
+  # Doing nothing is the same as this last block:
+  # case ",$KEYS_FILTER_0," in
+  # *",$key,"*)
+  #   case "$view" in
+  #   "$VIEW_ARTIST" | "$VIEW_RELEASEGROUP" | "$VIEW_RELEASE" | "$VIEW_LIST_ARTISTS" | "$VIEW_LIST_ALBUMS") echo "" ;;
+  #   esac
+  #   ;;
+  # esac
+}

src/sh/theme.sh

@@ -1,40 +1,90 @@
-# Colors (local)
+# Theme file (default theme)
-FAINT="\033[2m"
+# This file specifies the main theme of the visual representation. All
-CARTIST="\033[38;5;209m"
+# specifications provided here may be altered using the configuration file.
-CTITLE="\033[38;5;229m"
+#
-CYEAR="\033[38;5;179m"
+# This theme requires fonts that support utf-8, colors, and emojis.
-CDISAMB="$FAINT\033[38;5;172m"
-CNOTE="\033[38;5;242m"
-CXXX="\033[38;5;109m"
-CDESC="\033[38;5;254m"
-CLIFE="\033[38;5;251m"
-OFF="\033[m"
 
+# Colors (internal only)
+ESC=$(printf '\033')
+BOLD="${ESC}[1m"
+FAINT="${ESC}[2m"
+UNDERLINE="${ESC}[4m"
+CARTIST="${ESC}[38;5;209m"
+CTITLE="${ESC}[38;5;229m"
+CRELINFO="${ESC}[38;5;179m"
+CYEAR="${ESC}[38;5;179m"
+CDISAMB="$FAINT${ESC}[38;5;172m"
+CNOTE="${ESC}[38;5;242m"
+CXXX="${ESC}[38;5;109m"
+CDESC="${ESC}[38;5;254m"
+CLIFE="${ESC}[38;5;251m"
+CKB="${ESC}[38;5;224m"
+OFF="${ESC}[m"
+
+# Pointers
+# ========
+# Sign that indicates the existence of audio files
 FORMAT_LOCAL="${FORMAT_LOCAL:-"🔆"}"
+# Pointer to the track currently playing (playlist)
+FORMAT_CURRENT="${FORMAT_CURRENT:-"👉"}"
+export FORMAT_LOCAL FORMAT_CURRENT
 
-# Prompts
+# Input prompt
+# =============
+# Search prompt
 SEARCH_PROMPT=${SEARCH_PROMPT:-"🔎 〉"}
-ARTIST_PROMPT="${ARTIST_PROMPT:-"🎤 ${CARTIST}%s$OFF 〉"}"
+export SEARCH_PROMPT
-FULL_PROMPT="${FULL_PROMPT:-"🎤 ${CARTIST}%s$OFF 》${CTITLE}%s$OFF 〉"}"
+
+# Headers
+# =======
+# Header that displays artist's name
+HEADER_ARTIST="${HEADER_ARTIST:-"🎤 ${CARTIST}%s$OFF 〉"}"
+# Header that displays the release-group name after artist's
+HEADER_ARTIST_RELEASEGROUP="${HEADER_ARTIST_RELEASEGROUP:-"🎤 ${CARTIST}%s$OFF 》${CTITLE}%s$OFF 〉"}"
+# Header that in addition to `HEADER_ARTIST_RELEASEGROUP` also shows some
+# release information
+HEADER_RELEASE="${HEADER_RELEASE:-"🎤 ${CARTIST}%s$OFF 》${CTITLE}%s$OFF 〉%s"}"
+# The release information is formatted as follows (placeholders implicit):
+HEADER_RELEASE_FORMAT="${HEADER_RELEASE_FORMAT:-"${CRELINFO}<<tracks>> tx <<media>> $OFF|$CRELINFO <<label>> <<country>> <<year>>$OFF"}"
+export HEADER_ARTIST HEADER_ARTIST_RELEASEGROUP HEADER_RELEASE HEADER_RELEASE_FORMAT
 
 # Artist view
+# ===========
+# Artist string for persons
 AV_PERSON="${AV_PERSON:-"🧑‍🎤 $CARTIST<<name>>$OFF"}"
+# Artist string for groups
 AV_GROUP="${AV_GROUP:-"🧑‍🤝‍🧑 $CARTIST<<name>>$OFF"}"
+# Artist disambiguation string
 AV_DISAMBIGUATION="${AV_DISAMBIGUATION:-"$CDISAMB(<<disambiguation>>)$OFF"}"
+export AV_PERSON AV_GROUP AV_DISAMBIGUATION
 
-# Release group view
+# Release-group view
+# ==================
+# Default release group string
 RGV_RELEASE="${RGV_RELEASE:-"${CTITLE}<<title>>$OFF"}"
+# Release group string if the artist name differs from the current artist
 RGV_RELEASE_W_ARTIST="${RGV_RELEASE_W_ARTIST:-"${CTITLE}<<title>>$OFF — ${CARTIST}<<artist>>$OFF"}"
+# Year of the release group
 RGV_YEAR="${RGV_YEAR:-"${CYEAR}(<<year>>)$OFF"}"
+export RGV_RELEASE RGV_RELEASE_W_ARTIST RGV_YEAR
 
-# Types
+# Release-group types
+# ===================
+# Album
 FORMAT_TYPE_ALBUM="${FORMAT_TYPE_ALBUM:-"LP 💽"}"
+# EP
 FORMAT_TYPE_EP="${FORMAT_TYPE_EP:-"EP 📀"}"
+# Single
 FORMAT_TYPE_SINGLE="${FORMAT_TYPE_SINGLE:-"SI 🎶"}"
+# Broadcast
 FORMAT_TYPE_BROADCAST="${FORMAT_TYPE_BROADCAST:-"BR 📻"}"
+# Other
 FORMAT_TYPE_OTHER="${FORMAT_TYPE_OTHER:-"OT ❔"}"
+# Flag to indicate that the given release group has associated secondary types.
 FORMAT_TYPE_HAS_SECONDARY="${FORMAT_TYPE_HAS_SECONDARY:-"%s☼"}"
+# Style to represent secondary types (takes one %s placeholder)
 FORMAT_TYPE_SECONDARY="${FORMAT_TYPE_SECONDARY:-"${CNOTE}[☼: %s]$OFF"}"
+# Secondary types
 FORMAT_TYPE_SECONDARY_COMPILATION="${FORMAT_TYPE_SECONDARY_COMPILATION:-"🧩 compilation"}"
 FORMAT_TYPE_SECONDARY_SOUNDTRACK="${FORMAT_TYPE_SECONDARY_SOUNDTRACK:-"🎬 soundtrack"}"
 FORMAT_TYPE_SECONDARY_SPOKENWORD="${FORMAT_TYPE_SECONDARY_SPOKENWORD:-"📖 spokenword"}"
@@ -47,29 +97,72 @@ FORMAT_TYPE_SECONDARY_DJMIX="${FORMAT_TYPE_SECONDARY_DJMIX:-"🪩 DJ-mix"}"
 FORMAT_TYPE_SECONDARY_MIXTAPE="${FORMAT_TYPE_SECONDARY_MIXTAPE:-"📼 mixtape"}"
 FORMAT_TYPE_SECONDARY_DEMO="${FORMAT_TYPE_SECONDARY_DEMO:-"🧪 demo"}"
 FORMAT_TYPE_SECONDARY_FIELDREC="${FORMAT_TYPE_SECONDARY_FIELDREC:-"🌿 field recording"}"
+export FORMAT_TYPE_ALBUM FORMAT_TYPE_EP FORMAT_TYPE_SINGLE \
+  FORMAT_TYPE_BROADCAST FORMAT_TYPE_OTHER FORMAT_TYPE_HAS_SECONDARY \
+  FORMAT_TYPE_SECONDARY FORMAT_TYPE_SECONDARY_COMPILATION \
+  FORMAT_TYPE_SECONDARY_SOUNDTRACK FORMAT_TYPE_SECONDARY_SPOKENWORD \
+  FORMAT_TYPE_SECONDARY_INTERVIEW FORMAT_TYPE_SECONDARY_AUDIOBOOK \
+  FORMAT_TYPE_SECONDARY_AUDIODRAMA FORMAT_TYPE_SECONDARY_LIVE \
+  FORMAT_TYPE_SECONDARY_REMIX FORMAT_TYPE_SECONDARY_DJMIX \
+  FORMAT_TYPE_SECONDARY_MIXTAPE FORMAT_TYPE_SECONDARY_DEMO \
+  FORMAT_TYPE_SECONDARY_FIELDREC
 
 # Artist Preview
+# ==============
+# Main preview format. Takes two %s placeholder. The first is for the artist
+# biography. The second for the life span.
 APV_FORMAT="${APV_FORMAT:-"\n\n${CDESC}%s${OFF}\n\n${CLIFE}%s${OFF}"}"
+# Specification of a date
 APV_DATE="${APV_DATE:-"%s"}"
+# Specification of a place
 APV_PLACE="${APV_PLACE:-"%s"}"
+# Specification of a date and a place (in that order)
 APV_DATEPLACE="${APV_DATEPLACE:-"$APV_DATE, $APV_PLACE"}"
+# String to represent when/where a person is born
 APV_BORN="${APV_BORN:-"🍼 Born: %s"}"
+# String to represent when/where a person died
 APV_DIED="${APV_DIED:-"🕯️ Died: %s"}"
-
+export APV_FORMAT APV_DATE APV_PLACE APV_DATEPLACE APV_BORN APV_DIED
-# Status
-FORMAT_STATUS_OFFICIAL="${FORMAT_STATUS_OFFICIAL:-"🟢 official"}"
-FORMAT_STATUS_PROMO="${FORMAT_STATUS_PROMO:-"📣 promo"}"
-FORMAT_STATUS_BOOTLEG="${FORMAT_STATUS_BOOTLEG:-"💣 bootleg"}"
-FORMAT_STATUS_PSEUDO="${FORMAT_STATUS_PSEUDO:-"🌀 pseudo"}"
-FORMAT_STATUS_WITHDRAWN="${FORMAT_STATUS_WITHDRAWN:-"🔙 withdrawn"}"
-FORMAT_STATUS_EXPUNGED="${FORMAT_STATUS_EXPUNGED:-"🧹 expunged"}"
-FORMAT_STATUS_CANCELLED="${FORMAT_STATUS_CANCELLED:-"❌ cancelled"}"
 
 # Release view
-RV_FORMAT="<<status>>\t${CXXX}<<tracks>> tracks\t<<media>>$OFF\t${CYEAR}<<year>>\t<<country>>$OFF\t${CARTIST}<<label>>$OFF"
+# ============
-RV_TITLE_ARTIST="${FAINT}as ${CTITLE}<<title>>$OFF by ${FAINT}${CARTIST}<<artist>>$OFF"
+# Format of a string that represents a release.
-RV_TITLE="${FAINT}as ${CTITLE}<<title>>$OFF"
+RV_FORMAT="${RV_FORMAT:-"<<status>>\t${CXXX}<<tracks>> tracks\t<<media>>$OFF\t${CYEAR}<<year>>\t<<country>>$OFF\t${CARTIST}<<label>>$OFF"}"
-RV_ARTIST="${FAINT}by ${CARTIST}<<artist>>$OFF"
+# Additional string to display the release title and artist name
+RV_TITLE_ARTIST="${RV_TITLE_ARTIST:-"${FAINT}as ${CTITLE}<<title>>$OFF by ${FAINT}${CARTIST}<<artist>>$OFF"}"
+# Additional string to display the release title
+RV_TITLE="${RV_TITLE:-"${FAINT}as ${CTITLE}<<title>>$OFF"}"
+# Additional string to display the artist
+RV_ARTIST="${RV_ARTIST:-"${FAINT}by ${CARTIST}<<artist>>$OFF"}"
+export RV_FORMAT RV_TITLE_ARTIST RV_TITLE RV_ARTIST
+
+# Release Status
+# ==============
+FORMAT_STATUS_OFFICIAL="${FORMAT_STATUS_OFFICIAL:-"🟢"}"
+FORMAT_STATUS_PROMO="${FORMAT_STATUS_PROMO:-"📣"}"
+FORMAT_STATUS_BOOTLEG="${FORMAT_STATUS_BOOTLEG:-"💣"}"
+FORMAT_STATUS_PSEUDO="${FORMAT_STATUS_PSEUDO:-"🌀"}"
+FORMAT_STATUS_WITHDRAWN="${FORMAT_STATUS_WITHDRAWN:-"🔙"}"
+FORMAT_STATUS_EXPUNGED="${FORMAT_STATUS_EXPUNGED:-"🧹"}"
+FORMAT_STATUS_CANCELLED="${FORMAT_STATUS_CANCELLED:-"❌"}"
+export FORMAT_STATUS_OFFICIAL FORMAT_STATUS_PROMO FORMAT_STATUS_BOOTLEG \
+  FORMAT_STATUS_PSEUDO FORMAT_STATUS_WITHDRAWN FORMAT_STATUS_EXPUNGED \
+  FORMAT_STATUS_CANCELLED
 
 # Recording view
-REC_FORMAT="${CNOTE}${FAINT}<<med>>\t${CNOTE}<<nr>>$OFF\t${CTITLE}<<title>>\t${CARTIST}<<artist>>\t${CXXX}<<duration>>$OFF"
+# ==============
+# Format of a track in a release
+REC_FORMAT="${REC_FORMAT:-"${CNOTE}${FAINT}<<med>>\t${CNOTE}<<nr>>$OFF\t${CTITLE}<<title>>\t${CARTIST}<<artist>>\t${CXXX}<<duration>>$OFF"}"
+# Format of a track in the playlist
+REC_FORMAT_NO_NUMBER="${REC_FORMAT_NO_NUMBER:-"${CTITLE}<<title>>\t${CARTIST}<<artist>>\t${CXXX}<<duration>>$OFF"}"
+export REC_FORMAT REC_FORMAT_NO_NUMBER
+
+# Keybinding themes
+# =================
+# Format keybinding group
+KBF_GROUP="${KBF_GROUP:-"${UNDERLINE}${CKB}%s$OFF"}"
+# Format key
+KBF_KEY="${KBF_KEY:-"${BOLD}${CKB}%s$OFF"}"
+# Format description
+KBF_DESC="${KBF_DESC:-"${CKB}%s$OFF"}"
+export KBF_GROUP KBF_KEY KBF_DESC

src/sh/tools.sh

@@ -1,5 +1,16 @@
+# Load the tools required for this application. The tools are preset with
+# default command-line arguments.
+#
+# List of tools:
+# - fzf:   in order to display, search, and navigate lists
+# - curl:  for API access
+# - jq:    to parse json files
+# - mpv:   music player
+# - socat: to communicate with the socket mpv is bound to
+# - xsel:  to copy content to the clipboard (not necessary)
+if [ ! "${TOOLS_LOADED:-}" ]; then
   if command -v "fzf" >/dev/null; then
-  FZF="fzf --black"
+    FZF="fzf --black --ansi --cycle --tiebreak=chunk,index"
   else
     err "Did not find the command-line fuzzy finder fzf."
     exit 1
@@ -15,7 +26,7 @@ fi
   export CURL
 
   if command -v "jq" >/dev/null; then
-  JQ="jq"
+    JQ="jq -r --compact-output"
   else
     err "Did not find jq."
     exit 1
@@ -37,3 +48,9 @@ else
     exit 1
   fi
   export SOCAT
+
+  command -v "xsel" >/dev/null && CLIP="xsel" || CLIP="true"
+  export CLIP
+
+  export TOOLS_LOADED=1
+fi