use whitespace free paths only

.gitignore

@@ -0,0 +1 @@
+fzf-vjour

README.md

@@ -1,49 +1,45 @@
-A [fzf](https://github.com/junegunn/fzf)-based **journaling and notes** application with CalDav support.
+A [fzf](https://github.com/junegunn/fzf)-based **journaling, notes, and tasks** application with CalDav support.
 
 Description and Use Case
 ------------------------
-This application allows for a keyboard-controlled maneuvering of your notes and journal entries.
+This application allows for a keyboard-controlled maneuvering of your notes, journal entries, and tasks.
-A journal entry is nothing more than a note associated with a specific date.
+These entries are stored as [iCalendar](https://datatracker.ietf.org/doc/html/rfc5545) files of the type `VJOURNAL` and `VTODO`.
-These entries are stored as [iCalendar](https://datatracker.ietf.org/doc/html/rfc5545) files of the type `VJOURNAL`.
 
-For instance, you could use this application as a minimalistic terminal-based counterpart of [jtx Board](https://jtx.techbee.at/) in a setup
+For instance, you could use this application as a terminal-based counterpart of [jtx Board](https://jtx.techbee.at/) in a setup
 with a CalDav server, such as [Radicale](https://radicale.org/), and a synchronization tool like [vdirsyncer](http://vdirsyncer.pimutils.org/).
 
 Installation
 ------------
-Just copy the file to your preferred location, e.g., `~/.local/bin`, and make it executable.
+Download the file `fzf-vjour` from the [latest release](https://github.com/baumea/fzf-vjour/releases/latest), or run `./scripts/build.sh`, then
+copy `fzf-vjour` to your preferred location, e.g., `~/.local/bin`, and make it executable.
 
 ### Requirements
-This is a POSIX script with inline `python3` elements.
+This is a POSIX script with inline `awk` elements.
-Make sure you have [fzf](https://github.com/junegunn/fzf), [batcat](https://github.com/sharkdp/bat), and [yq](https://github.com/mikefarah/yq) installed.
+Make sure you have [fzf](https://github.com/junegunn/fzf) installed.
-For the `python3` code, we also require [icalendar](https://pypi.org/project/icalendar/).
+I also suggest to install [batcat](https://github.com/sharkdp/bat) for colorful previews.
 
 Configuration
 --------------
-This application is configured with a YAML file located at `$HOME/.config/fzf-vjour/config.yaml`.
+This application is configured with a file located at `$HOME/.config/fzf-vjour/config`.
-The entry `datadir` specifies the root directory of your journal and note entries.
+The entry `ROOT` specifies the root directory of your journal and note entries.
 This directory may contain several subfolders, called _collections_.
-The entry `collections` is a list, where each item specifies a subfolder, given by `name`, and a label, given by `label` (any string).
+The entry `COLLECTION_LABELS` is a `;`-delimited list, where each item specifies a subfolder and a label (see example below).
 In the application, the user sees the collection labels instead of the collection names.
 This is particularly useful, because some servers use randomly generated names.
-Finally, a third entry `sync_cmd` specifies the command to be executed for synchronizing. 
+Finally, a third entry `SYNC_CMD` specifies the command to be executed for synchronizing. 
 
 Consider the following example:
-```yaml
+```sh
-datadir: ~/.journal
+ROOT=~/.journal/
-sync_cmd: vdirsyncer sync journals
+COLLECTION_LABELS="745ae7a0-d723-4cd8-80c4-75f52f5b7d90=shared 👫🏼;12cacb18-d3e1-4ad4-a1d0-e5b209012e85=work   💼;"
-collections:
+SYNC_CMD="vdirsyncer sync journals"
-  - name: 12cacb18-d3e1-4ad4-a1d0-e5b209012e85
-    label: 💼
-  - name: 745ae7a0-d723-4cd8-80c4-75f52f5b7d90
-    label: 🏡
 ```
 
 
 Here the files are stored in
 `~/.journal/12cacb18-d3e1-4ad4-a1d0-e5b209012e85` (work-related entries)
 and
-`~/.journal/745ae7a0-d723-4cd8-80c4-75f52f5b7d90` (personal collection).
+`~/.journal/745ae7a0-d723-4cd8-80c4-75f52f5b7d90` (shared collection).
 
 This configuration will work well with a `vdirsyncer` configuration such as 
 ```confini
@@ -59,20 +55,30 @@ path = "~/.journal"
 
 [storage remote]
 type = "caldav"
-item_types = ["VJOURNAL"]
+item_types = ["VJOURNAL", "VTODO"]
 ...
 ```
 
 Usage
 -----
-Use the default `fzf` keys to navigate your notes. In addition, there are the following keybindings:
+Use the default `fzf` keys to navigate your notes, e.g., `ctrl-j` and `ctrl-k` for going down/up in the list.
+In addition, there are the following keybindings:
 | Key | Action |
 | --- | ------ |
-| enter | Open note/journal in your `$EDITOR` |
+| `enter` | Open note/journal/task in your `$EDITOR` |
-| ctrl-d | Delete the seleted entry |
+| `ctrl-alt-d` | Delete the seleted entry |
-| ctrl-n | Make a new entry |
+| `ctrl-n` | Make a new entry |
-| ctrl-r | Refresh the view |
+| `ctrl-r` | Refresh the view |
-| ctrl-s | Run the synchronization command |
+| `ctrl-s` | Run the synchronization command |
+| `ctrl-x` | Toggle task completion |
+| `alt-up` | Increase task priority |
+| `alt-down` | Decrease task priority |
+| `alt-0` | Default view: Journal, notes, and _open_ tasks |
+| `alt-1` | Display journal entries |
+| `alt-2` | Display notes |
+| `alt-3` | Display all tasks |
+
+You may also invoke the script with `--help` to see further command-line options. 
 
 License
 -------

fzf-vjour

@@ -1,382 +0,0 @@
-#!/bin/sh
-
-set -eu
-
-# Read configuration
-CONFIGFILE="$HOME/.config/fzf-vjour/config.yaml"
-if [ ! -e "$CONFIGFILE" ]; then
-  echo "Config file '$CONFIGFILE' not found"
-  exit 1
-fi
-ROOT=$(yq '.datadir' <"$CONFIGFILE")
-ROOT=$(eval "echo $ROOT")
-if [ ! -d "$ROOT" ]; then
-  echo "Root directory not set or wrongly set"
-  exit 1
-fi
-SED_COLLECTIONNAMES_TO_LABELS=$(
-  printf "sed "
-  yq '.collections[] | "s|/*" + .name + "/*|:" + .label + "\ |"' <"$CONFIGFILE" |
-    xargs printf "-e \"%s\" "
-)
-SED_COLLECTIONLABELS_TO_NAMES=$(
-  printf "sed "
-  yq '.collections[] | "s|\ *" + .label + "\ *|/" + .name + "/|"' <"$CONFIGFILE" |
-    xargs printf "-e \"%s\" "
-)
-COLLECTION_LABEL_MAX_LEN=$(yq '[.collections[].label | length] | max' <"$CONFIGFILE")
-LABLES=$(yq '.collections[].label' <"$CONFIGFILE")
-SYNC_CMD=$(yq '.sync_cmd' <"$CONFIGFILE")
-
-__vjournalnew() {
-  python3 -c '
-import sys
-from datetime import date, datetime
-from icalendar.cal import Calendar, Journal
-
-if not len(sys.argv) == 2:
-    print("Pass uid as first argument!", file=sys.stderr)
-    sys.exit(1)
-
-UID = sys.argv[1]
-ical = Calendar()
-j = Journal()
-
-isnote = True
-line = sys.stdin.readline().strip()
-if line[:4] == "::: ":
-    isnote = False
-    line = sys.stdin.readline().strip()
-
-if not line[:2] == "# ":
-    print("Error: Summary line is corrupt!", file=sys.stderr)
-    sys.exit(1)
-summary = line[2:]
-
-line = sys.stdin.readline().strip()
-if not line[:2] == "> " and not line == ">":
-    print("Error: Categories line is corrupt!", file=sys.stderr)
-    sys.exit(1)
-categories = line[2:].split(",")
-
-line = sys.stdin.readline().strip()
-if not line == "":
-    print("Error: Missing separating line!", file=sys.stderr)
-    sys.exit(1)
-
-description = sys.stdin.read()
-
-# Create ical
-j["SUMMARY"] = summary
-j.categories = categories
-j["DESCRIPTION"] = description
-j.LAST_MODIFIED = datetime.utcnow()
-j.DTSTAMP = datetime.utcnow()
-j["UID"] = UID
-j["SEQUENCE"] = 1
-j["STATUS"] = "FINAL"
-if not isnote:
-    j.DTSTART = date.today()
-ical.add_component(j)
-ical["VERSION"] = "2.0"
-ical["PRODID"] = "vjournew/basic"
-
-# Print
-print(ical.to_ical().decode().replace("\r\n", "\n"))' "$@"
-}
-__vjournalupdate() {
-  python3 -c '
-import sys
-from datetime import datetime
-from icalendar.cal import Journal
-
-if not len(sys.argv) == 2:
-    print("Pass ical file as first argument!", file=sys.stderr)
-    sys.exit(1)
-
-with open(sys.argv[1], "r") as f:
-    try:
-        ical = Journal.from_ical(f.read())
-    except Exception as e:
-        print(f"Failed to read vjournal file: {e}", file=sys.stderr)
-        sys.exit(1)
-
-jlist = [component for component in ical.walk("VJOURNAL")]
-if len(jlist) == 0:
-    print("ical file is not a VJOURNAL", file=sys.stderr)
-    sys.exit(1)
-j = jlist[0]
-
-line = sys.stdin.readline().strip()
-if not line[:2] == "# ":
-    print("Error: Summary line is corrupt!", file=sys.stderr)
-    sys.exit(1)
-summary = line[2:]
-
-line = sys.stdin.readline().strip()
-if not line[:2] == "> " and not line == ">":
-    print("Error: Categories line is corrupt!", file=sys.stderr)
-    sys.exit(1)
-categories = line[2:].split(",")
-
-line = sys.stdin.readline().strip()
-if not line == "":
-    print("Error: Missing separating line!", file=sys.stderr)
-    sys.exit(1)
-
-description = sys.stdin.read()
-
-# Update ical
-j["SUMMARY"] = summary
-j.categories = categories
-j["DESCRIPTION"] = description
-j.LAST_MODIFIED = datetime.utcnow()
-
-# Print
-print(ical.to_ical().decode().replace("\r\n", "\n"))
-' "$@"
-}
-
-__vjournal2json() {
-  python3 -c '
-import sys
-import json
-from datetime import datetime
-from zoneinfo import ZoneInfo
-from icalendar.cal import Journal
-
-input_data = sys.stdin.read()
-try:
-    ical = Journal.from_ical(input_data)
-except Exception as e:
-    print(f"Failed to read vjournal file: {e}", file=sys.stderr)
-    sys.exit(1)
-
-jlist = [component for component in ical.walk("VJOURNAL")]
-if len(jlist) == 0:
-    sys.exit(0)
-
-j = jlist[0]
-
-local_tz = ZoneInfo("localtime")
-data = {
-    "summary": j.get("SUMMARY"),
-    "description": j.get("DESCRIPTION"),
-    "categories": j.categories,
-    "class": j.get("CLASS"),
-    "created": str(j.DTSTAMP.astimezone(local_tz)),
-    "last_modified": str(j.LAST_MODIFIED.astimezone(local_tz)),
-    "start": str(
-        j.DTSTART.astimezone(local_tz)
-        if isinstance(j.DTSTART, datetime)
-        else j.DTSTART or ""
-    ),
-}
-
-print(json.dumps(data))'
-}
-# Process each file
-# This function takes two arguments:
-#
-# @param string: Path to ics file
-# @param string: Maximum length of filenames (for padding purposes)
-__filepath_to_searchline() {
-  filepath="$1"
-  maxlen="$2"
-  totallen=$((maxlen + ${#ROOT}))
-  filepathpad=$(printf "%-${totallen}s" "$filepath")
-
-  # Color support
-  GREEN=$(printf '\033[1;32m')
-  WHITE=$(printf '\033[1;97m')
-  FAINT=$(printf '\033[2m')
-  OFF=$(printf '\033[m')
-
-  # Parse file
-  summary=""
-  categories=""
-  dtstamp=""
-  dtstart=""
-  while IFS= read -r line; do
-    case "$line" in
-    SUMMARY:*)
-      summary="${line#SUMMARY:}"
-      ;;
-    CATEGORIES:*)
-      categories="${line#CATEGORIES:}"
-      ;;
-    DTSTAMP:*)
-      dtstamp="${line#DTSTAMP:}"
-      ;;
-    DTSTART*:[0-9]*)
-      dtstart=$(echo "$line" | grep -oE '[0-9]{8}')
-      ;;
-    esac
-    if [ -n "$summary" ] && [ -n "$categories" ] && [ -n "$dtstamp" ] && [ -n "$dtstart" ]; then
-      break
-    fi
-  done <"$filepath"
-
-  # Parse date
-  if [ -n "$dtstart" ]; then
-    date_target=$(date -d "$dtstart" +%s)
-    date_today=$(date +%s)
-    date_delta=$(((date_target - date_today) / 86400))
-    date_expr=$date_delta
-    if [ "$date_delta" -eq 0 ]; then
-      date_expr="today"
-    elif [ "$date_delta" -eq -1 ]; then
-      date_expr="yesterday"
-    elif [ "$date_delta" -eq 1 ]; then
-      date_expr="tomorrow"
-    elif [ "$date_delta" -lt -1 ] && [ "$date_delta" -ge -7 ]; then
-      date_expr="last $(date -d "$dtstart" +%A)"
-    elif [ "$date_delta" -gt 1 ] && [ "$date_delta" -le 7 ]; then
-      date_expr="next $(date -d "$dtstart" +%A)"
-    else
-      date_expr=$(date -d "$dtstart" +%x)
-    fi
-    date_emoji="📘"
-  else
-    date_emoji="🗒️"
-    date_expr=""
-  fi
-  date_expr=$(printf "%12s" "$date_expr")
-
-  # Print line
-  echo "$dtstamp $filepath $WHITE$date_expr$OFF $date_emoji $GREEN$summary$OFF $FAINT$categories$OFF"
-}
-
-__lines() {
-  # Collect all files
-  FILES_TMP=$(mktemp)
-  trap 'rm -f "$FILES_TMP"' EXIT
-  find "$ROOT" -type f -name '*.ics' >"$FILES_TMP"
-
-  # Compute max length of basenames
-  maxlen=0
-  while IFS= read -r file; do
-    name=$(basename "$file")
-    [ ${#name} -gt "$maxlen" ] && maxlen=${#name}
-  done <"$FILES_TMP"
-
-  lines=$(while IFS= read -r file; do
-    __filepath_to_searchline "$file" "$maxlen"
-  done <"$FILES_TMP")
-
-  # Decorate
-  lines=$(echo "$lines" | eval "$SED_COLLECTIONNAMES_TO_LABELS")
-
-  # Sort and cut off irreleant part
-  lines=$(echo "$lines" | sort -g -r | cut -d ':' -f 2-)
-
-  echo "$lines"
-}
-
-__filepath_from_selection() {
-  selection=$(echo "$1" | cut -d " " -f 1,2 | eval "$SED_COLLECTIONLABELS_TO_NAMES" | sed "s|^|$ROOT/|")
-  echo "$selection"
-}
-
-# Program starts here
-
-# Command line arguments to be self-contained
-# Generate preview of file from selection
-if [ "${1:-}" = "--preview" ]; then
-  vjfile=$(__filepath_from_selection "$2")
-  __vjournal2json <"$vjfile" | jq -r ".description" | batcat --color=always --style=numbers --language=md
-  exit
-fi
-# Delete file from selection
-if [ "${1:-}" = "--delete" ]; then
-  vjfile=$(__filepath_from_selection "$2")
-  rm -v "$vjfile"
-fi
-# Generate new entry
-if [ "${1:-}" = "--new" ]; then
-  label_new=$(echo "$LABLES" | fzf \
-    --margin 20% \
-    --prompt="Select collection> ")
-  uuid_new=$(uuidgen)
-  vjfile_new=$(__filepath_from_selection "$label_new $uuid_new.ics")
-  if [ -f "$vjfile_new" ]; then
-    echo "Bad luck..."
-    return 1
-  fi
-  #
-  TMPFILE="$(mktemp).md"
-  SHAFILE="$TMPFILE.sha"
-  trap 'rm -f "$TMPFILE" "$SHAFILE"' EXIT
-  {
-    echo "::: Keep this line if you want to add a **JOURNAL** entry (associated to today), else we will add a **NOTE**"
-    echo "# <write summary here>"
-    echo "> <comma-separated list of categories>"
-    echo ""
-  } >"$TMPFILE"
-  sha1sum "$TMPFILE" >"$SHAFILE"
-
-  # Open in editor
-  $EDITOR "$TMPFILE" >/dev/tty
-
-  # Update if changes are detected
-  if ! sha1sum -c "$SHAFILE" >/dev/null 2>&1; then
-    vjfile_tmp="$TMPFILE.ics"
-    trap 'rm -f "$vjfile_tmp"' EXIT
-    __vjournalnew "$uuid_new" <"$TMPFILE" >"$vjfile_tmp" && mv "$vjfile_tmp" "$vjfile_new"
-  fi
-fi
-if [ "${1:-}" = "--reload" ]; then
-  __lines
-  exit
-fi
-
-selection=$(
-  __lines | fzf --ansi \
-    --preview="$0 --preview {}" \
-    --bind="ctrl-d:become($0 --delete {})" \
-    --bind="ctrl-n:become($0 --new)" \
-    --bind="ctrl-s:execute($SYNC_CMD)" \
-    --bind="ctrl-r:reload-sync($0 --reload)"
-)
-if [ -z "$selection" ]; then
-  return 0
-fi
-
-VJ_FILE=$(__filepath_from_selection "$selection")
-
-if [ ! -f "$VJ_FILE" ]; then
-  echo "ERROR: File '$VJ_FILE' does not exist!"
-  return 1
-fi
-
-# Parse vjournal file and save as json
-TMPJSON="$(mktemp).json"
-trap 'rm -f "$TMPJSON"' EXIT
-__vjournal2json <"$VJ_FILE" >"$TMPJSON"
-
-# Prepare file to be edited
-TMPFILE="$(mktemp).md"
-SHAFILE="$TMPFILE.sha"
-trap 'rm -f "$TMPFILE" "$SHAFILE"' EXIT
-SUMMARY=$(jq -r '.summary' "$TMPJSON")
-CATEGORIES=$(jq -r '.categories | join(",")' "$TMPJSON")
-{
-  echo "# $SUMMARY"
-  echo "> $CATEGORIES"
-  echo ""
-  jq -r '.description' "$TMPJSON"
-} >"$TMPFILE"
-sha1sum "$TMPFILE" >"$SHAFILE"
-
-# Open in editor
-$EDITOR "$TMPFILE"
-
-# Update only if changes are detected
-if ! sha1sum -c "$SHAFILE" >/dev/null 2>&1; then
-  echo "Uh... chages detected!"
-  vj_file_new="$TMPFILE.ics"
-  trap 'rm -f "$vj_file_new"' EXIT
-  __vjournalupdate "$VJ_FILE" <"$TMPFILE" >"$vj_file_new" && mv "$vj_file_new" "$VJ_FILE"
-fi
-
-exec "$0"

scripts/build.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+BOLD="\033[1m"
+GREEN="\033[0;32m"
+OFF="\033[m"
+NAME="fzf-vjour"
+SRC="./src/main.sh"
+echo "🐔 ${GREEN}Building${OFF} ${BOLD}$NAME${OFF}"
+sed -E 's|@@include (.+)$|cat \1|e' "$SRC" >"$NAME"
+chmod +x "$NAME"
+echo "🥚 ${GREEN}Done${OFF}"

src/awk/altertodo.awk

@@ -0,0 +1,41 @@
+# Increase/decrease priority, or toggle completed status
+#
+# If `delta` is specified using `-v`, then the priority value is increased by
+# `delta.` If `delta` is unspecified (or equal to 0), then the completeness
+# status is toggled.
+BEGIN { 
+  FS=":";
+  zulu = strftime("%Y%m%dT%H%M%SZ", systime(), 1);
+  delta = delta + 0; # cast as integer
+}
+/^END:VTODO/ && inside     { 
+  # Print sequence and last-modified, if not yet printed
+  if (!seq) print "SEQUENCE:1";
+  if (!lm) print "LAST-MODIFIED:" zulu;
+
+  # Print priority
+  prio = prio ? prio + delta : 0 + delta;
+  prio = prio < 0 ? 0 : prio;
+  prio = prio > 9 ? 9 : prio;
+  print "PRIORITY:" prio;
+
+  # Print status (toggle if needed)
+  bit_status = status == "COMPLETED" ? 1 : 0;
+  bit_toggle = delta ? 0 : 1;
+  percent = xor(bit_status, bit_toggle) ? 100 : 0;
+  status = xor(bit_status, bit_toggle) ? "COMPLETED" : "NEEDS-ACTION";
+  print "STATUS:" status
+  print "PERCENT-COMPLETE:" percent
+
+  # print rest
+  inside = ""; 
+  print $0;
+  next
+}
+/^BEGIN:VTODO/                { inside = 1;    print;                       next }
+/^SEQUENCE/ && inside         { seq = 1;       print "SEQUENCE:" $2+1;      next }
+/^LAST-MODIFIED/ && inside    { lm = 1;        print "LAST-MODIFIED:" zulu; next }
+/^PRIORITY:/ && inside        { prio = $2;                                  next }
+/^STATUS/ && inside           { status = $2;                                next }
+/^PERCENT-COMPLETE/ && inside {                                             next } # ignore, we take STATUS:COMPLETED as reference
+{ print }

src/awk/export.awk

@@ -0,0 +1,39 @@
+function getcontent(content_line, prop)
+{
+  return substr(content_line[prop], index(content_line[prop], ":") + 1);
+}
+
+function storetext_line(content_line, c, prop)
+{
+  c[prop] = getcontent(content_line, prop);
+  gsub("\\\\n",    "\n", c[prop]);
+  gsub("\\\\N",    "\n", c[prop]);
+  gsub("\\\\,",    ",",  c[prop]);
+  gsub("\\\\;",    ";",  c[prop]);
+  gsub("\\\\\\\\", "\\", c[prop]);
+}
+
+BEGIN                                   { FS = "[:;]"; }
+/^BEGIN:(VJOURNAL|VTODO)/               { type = $2 }
+/^END:/ && $2 == type                   { exit }
+/^(CATEGORIES|DESCRIPTION|SUMMARY|DUE)/ { prop = $1; content_line[prop] = $0;                               next; }
+/^[^ ]/ && prop                         { prop = "";                                                        next; }
+/^ / && prop                            {            content_line[prop] = content_line[prop] substr($0, 2); next; }
+
+END {
+  if (!type) {
+    exit
+  }
+  # Process content lines
+  storetext_line(content_line, c, "CATEGORIES" );
+  storetext_line(content_line, c, "DESCRIPTION");
+  storetext_line(content_line, c, "SUMMARY"    );
+  storetext_line(content_line, c, "DUE"        );
+  # Print
+  if (c["DUE"])
+    print "::: <| " substr(c["DUE"], 1, 4) "-" substr(c["DUE"], 5, 2) "-" substr(c["DUE"], 7, 2);
+  print "# " c["SUMMARY"];
+  print "> " c["CATEGORIES"];
+  print "";
+  print c["DESCRIPTION"];
+}

src/awk/get.awk

@@ -0,0 +1,18 @@
+# print content of field `field`
+BEGIN                     { FS = ":"; regex = "^" field; }
+/^BEGIN:(VJOURNAL|VTODO)/ { type = $2 }
+/^END:/ && $2 == type     { exit }
+$0 ~ field                { content = $0;                    next; }
+/^ / && content           { content = content substr($0, 2); next; }
+/^[^ ]/ && content        { exit }
+END {
+  if (!type) { exit }
+  # Process content line
+  content = substr(content, index(content, ":") + 1);
+  gsub("\\\\n",    "\n", content);
+  gsub("\\\\N",    "\n", content);
+  gsub("\\\\,",    ",",  content);
+  gsub("\\\\;",    ";",  content);
+  gsub("\\\\\\\\", "\\", content);
+  print content;
+}

src/awk/list.awk

@@ -0,0 +1,225 @@
+# awk script to generate summary line for iCalendar VJOURNAL and VTODO entries
+#
+# See https://datatracker.ietf.org/doc/html/rfc5545 for the RFC 5545 that
+# describes iCalendar, and its syntax
+
+function getcontent(content_line, prop)
+{
+  return substr(content_line[prop], index(content_line[prop], ":") + 1);
+}
+
+function storetext_line(content_line, c, prop)
+{
+  c[prop] = getcontent(content_line, prop);
+  gsub("\\\\n",    " ",  c[prop]);
+  gsub("\\\\N",    " ",  c[prop]);
+  gsub("\\\\,",    ",",  c[prop]);
+  gsub("\\\\;",    ";",  c[prop]);
+  gsub("\\\\\\\\", "\\", c[prop]);
+  #gsub(" ",    "_",  c[prop]);
+}
+
+function storeinteger(content_line, c, prop)
+{
+  c[prop] = getcontent(content_line, prop);
+  c[prop] = c[prop] ? c[prop] : 0;
+}
+
+function storedatetime(content_line, c, prop)
+{
+  c[prop] = getcontent(content_line, prop);
+}
+
+function storedate(content_line, c, prop)
+{
+  c[prop] = substr(getcontent(content_line, prop), 1, 8);
+}
+
+function formatdate(date, today, todaystamp,       ts, ts_y, ts_m, ts_d, delta)
+{
+  ts_y = substr(date, 1, 4);
+  ts_m = substr(date, 5, 2);
+  ts_d = substr(date, 7);
+  ts = mktime(ts_y " " ts_m " " ts_d " 00 00 00");
+  delta = (ts - todaystamp) / 86400;
+  if (delta >= 0 && delta < 1) {
+    return "         today";
+  }
+  if (delta >= 1 && delta < 2) {
+    return "      tomorrow";
+  }
+  if (delta >= 2 && delta < 3) {
+    return "   in two days";
+  }
+  if (delta >= 3 && delta < 4) {
+    return " in three days";
+  }
+  if (delta < 0 && delta >= -1) {
+    return "     yesterday";
+  }
+  if (delta < -1 && delta >= -2) {
+    return "  two days ago";
+  }
+  if (delta < -2 && delta >= -3) {
+    return "three days ago";
+  }
+  return "    " substr(date, 1, 4) "-" substr(date, 5, 2) "-" substr(date, 7);
+}
+
+BEGIN {
+  # We require the following variables to be set using -v
+  # collection_lables: ;-delimited collection=label strings
+  # flag_open:      symbol for open to-dos
+  # flag_completed: symbol for completed to-dos
+  # flag_journal:   symbol for journal entries
+  # flag_note:      symbol for note entries
+
+  FS = "[:;]";
+  # Collections
+  split(collection_labels, mapping, ";");
+  for (map in mapping)
+  {
+    split(mapping[map], m, "=");
+    collection2label[m[1]] = m[2];
+  }
+  # Colors
+  GREEN = "\033[1;32m";
+  RED = "\033[1;31m";
+  WHITE = "\033[1;97m";
+  CYAN = "\033[1;36m";
+  FAINT = "\033[2m";
+  OFF = "\033[m";
+
+  # For date comparision
+  today = strftime("%Y%m%d");
+  todaystamp = mktime(substr(today, 1, 4) " " substr(today, 5, 2) " " substr(today, 7) " 00 00 00");
+}
+
+# Reset variables
+BEGINFILE {
+  type = "";
+  prop = "";
+  delete content_line;
+  delete c;
+
+}
+
+/^BEGIN:(VJOURNAL|VTODO)/ {
+  type = $2
+}
+
+/^END:/ && $2 == type {
+  nextfile
+}
+
+/^(CATEGORIES|DESCRIPTION|PRIORITY|STATUS|SUMMARY|COMPLETED|DUE|DTSTART|DURATION|CREATED|DTSTAMP|LAST-MODIFIED)/ {
+  prop = $1;
+  content_line[prop] = $0;
+  next;
+}
+/^[^ ]/ && prop {
+  prop = "";
+  next;
+}
+/^ / && prop {
+  content_line[prop] = content_line[prop] substr($0, 2); 
+  next; 
+}
+
+ENDFILE {
+  if (!type) {
+    exit
+  }
+  # Construct path, and check for validity
+  depth = split(FILENAME, path, "/");
+  fpath = path[depth-1] "/" path[depth]
+  if (index(fpath, " "))
+  {
+    print 10,
+          "-",
+          "-",
+          RED "ERROR: file '" fpath "' contains whitespaces!" OFF
+    exit
+  }
+  # Collection name
+  collection = path[depth-1]
+  collection = collection in collection2label ? collection2label[collection] : collection;
+
+  # Process content lines
+  storetext_line(content_line, c, "CATEGORIES"   );
+  storetext_line(content_line, c, "DESCRIPTION"  );
+  storeinteger(  content_line, c, "PRIORITY"     );
+  storetext_line(content_line, c, "STATUS"       );
+  storetext_line(content_line, c, "SUMMARY"      );
+  storedatetime( content_line, c, "COMPLETED"    );
+  storedate(     content_line, c, "DUE"          );
+  storedate(     content_line, c, "DTSTART"      );
+  storedatetime( content_line, c, "DURATION"     );
+  storedatetime( content_line, c, "CREATED"      );
+  storedatetime( content_line, c, "DTSTAMP"      );
+  storedatetime( content_line, c, "LAST-MODIFIED");
+
+  # Priority field, primarly used for sorting
+  priotext = "";
+  prio = 0;
+  if (c["PRIORITY"] > 0)
+  {
+    priotext = "❗(" c["PRIORITY"] ") ";
+    prio = 10 - c["PRIORITY"];
+  }
+
+  # Last modification/creation time stamp, used for sorting
+  # LAST-MODIFIED: Optional field for VTODO and VJOURNAL entries, date-time in
+  #                UTC time format
+  # DTSTAMP:       mandatory field in VTODO and VJOURNAL, date-time in UTC time
+  #                format
+  mod = c["LAST-MODIFIED"] ? c["LAST-MODIFIED"] : c["DTSTAMP"];
+
+  # Date field. For VTODO entries, we show the due date, for journal entries,
+  # the associated date.
+  datecolor = CYAN;
+  summarycolor = GREEN;
+
+  if (type == "VTODO")
+  {
+    # Either DUE or DURATION may appear. If DURATION appears, then also DTSTART
+    d = c["DUE"] ? c["DUE"] : 
+      (c["DURATION"] ? c["DTSTART"] " for " c["DURATION"] : "");
+    if (d && d <= today && c["STATUS"] != "COMPLETED")
+    {
+      datecolor = RED;
+      summarycolor = RED;
+    }
+  } else {
+    d = c["DTSTART"];
+  }
+  d = d ? formatdate(d, today, todaystamp       ts, ts_y, ts_m, ts_d, delta) : "              ";
+
+  # flag: - "journal"   for VJOURNAL with DTSTART
+  #       - "note"      for VJOURNAL without DTSTART
+  #       - "completed" for VTODO with c["STATUS"] == COMPLETED
+  #       - "open"      for VTODO with c["STATUS"] != COMPLETED
+  if (type == "VTODO")
+    flag = c["STATUS"] == "COMPLETED" ? flag_completed : flag_open;
+  else
+    flag = c["DTSTART"] ? flag_journal : flag_note;
+  
+  # summary
+  # c["SUMMARY"]
+  summary = c["SUMMARY"] ? c["SUMMARY"] : " "
+
+  # categories
+  categories = c["CATEGORIES"] ? c["CATEGORIES"] : " "
+
+  # filename
+  # FILENAME
+
+  print prio,
+        mod,
+        fpath,
+        collection,
+        datecolor d OFF,
+        flag,
+        priotext summarycolor summary OFF,
+        WHITE categories OFF;
+}

src/awk/new.awk

@@ -0,0 +1,96 @@
+function escape_categories(str)
+{
+  gsub("\\\\", "\\\\", str);
+  gsub(";",  "\\\\;",    str);
+}
+
+function escape(str)
+{
+  escape_categories(str)
+  gsub(",",  "\\\\,",    str);
+}
+
+function print_fold(nameparam, content,    i, s)
+{
+  i = 74 - length(nameparam);
+  s = substr(content, 1, i);
+  print nameparam s;
+  s = substr(content, i+1, 73);
+  i = i + 73;
+  while (s)
+  {
+    print " " s;
+    s = substr(content, i+1, 73);
+    i = i + 73;
+  }
+}
+
+BEGIN { 
+  FS=":"; 
+  type = "VJOURNAL"; 
+  zulu = strftime("%Y%m%dT%H%M%SZ", systime(), 1);
+}
+desc { desc = desc "\\n" $0; next; }
+{
+  if (substr($0, 1, 6) == "::: |>")
+  {
+    start = substr(zulu, 1, 8);
+    getline;
+  }
+  if (substr($0, 1, 6) == "::: <|")
+  {
+    type = "VTODO"
+    due = substr($0, 8);
+    getline;
+  }
+  summary = substr($0, 1, 2) != "# " ? "" : substr($0, 3);
+  getline;
+  categories = substr($0, 1, 1) != ">" ? "" : substr($0, 3);
+  getline; # This line should be empty
+  getline; # First line of description
+  desc = $0;
+  next;
+}
+END {
+  # Sanitize input
+  if (due) {
+    # Use command line `date` for parsing
+    cmd = "date -d \"" due "\" +\"%Y%m%d\"";
+    cmd | getline res
+    due = res ? res : ""
+  }
+  escape(summary);
+  escape(desc);
+  escape_categories(categories);
+
+  # print ical
+  print "BEGIN:VCALENDAR";
+  print "VERSION:2.0";
+  print "CALSCALE:GREGORIAN";
+  print "PRODID:-//fab//awk//EN";
+  print "BEGIN:" type;
+  print "DTSTAMP:" zulu;
+  print "UID:" uid;
+  print "CLASS:PRIVATE";
+  print "CREATED:" zulu;
+  print "SEQUENCE:1";
+  print "LAST-MODIFIED:" zulu;
+  if (type == "VTODO")
+  {
+    print "STATUS:NEEDS-ACTION";
+    print "PERCENT-COMPLETE:0";
+    if (due)
+      print "DUE;VALUE=DATE:" due; 
+  }
+  else
+  {
+    print "STATUS:FINAL";
+    if (start)
+      print "DTSTART;VALUE=DATE:" start;
+  }
+  if (summary)    print_fold("SUMMARY:",     summary,       i, s);
+  if (categories) print_fold("CATEGORIES:",  categories,    i, s);
+  if (desc)       print_fold("DESCRIPTION:", desc,          i, s);
+  print "END:" type;
+  print "END:VCALENDAR"
+}

src/awk/update.awk

@@ -0,0 +1,85 @@
+function getcontent(content_line, prop)
+{
+  return substr(content_line[prop], index(content_line[prop], ":") + 1);
+}
+
+function escape_categories(str)
+{
+  gsub("\\\\", "\\\\", str);
+  gsub(";",  "\\\\;",    str);
+}
+
+function escape(str)
+{
+  escape_categories(str)
+  gsub(",",  "\\\\,",    str);
+}
+
+function print_fold(nameparam, content,    i, s)
+{
+  i = 74 - length(nameparam);
+  s = substr(content, 1, i);
+  print nameparam s;
+  s = substr(content, i+1, 73);
+  i = i + 73;
+  while (s)
+  {
+    print " " s;
+    s = substr(content, i+1, 73);
+    i = i + 73;
+  }
+}
+
+BEGIN { 
+  FS=":";
+  zulu = strftime("%Y%m%dT%H%M%SZ", systime(), 1);
+}
+
+ENDFILE { 
+  if (NR == FNR)
+  {
+    # Sanitize input
+    if (due) {
+      # Use command line `date` for parsing
+      cmd = "date -d \"" due "\" +\"%Y%m%d\"";
+      cmd | getline res
+      due = res ? res : ""
+    }
+    escape(summary);
+    escape(desc);
+    escape_categories(categories);
+  }
+}
+
+NR == FNR && desc { desc = desc "\\n" $0; next; }
+NR == FNR {
+  if (substr($0, 1, 6) == "::: <|")
+  {
+    due = substr($0, 8);
+    getline;
+  }
+  summary = substr($0, 1, 2) != "# " ? "" : substr($0, 3);
+  getline;
+  categories = substr($0, 1, 1) != ">" ? "" : substr($0, 3);
+  getline; # This line should be empty
+  getline; # First line of description
+  desc = $0;
+  next;
+}
+
+/^BEGIN:(VJOURNAL|VTODO)/                                     { type = $2; print; next }
+/^X-ALT-DESC/ && type                                         { next } # drop this alternative description
+/^ / && type                                                  { next } # drop this folded line (the only content with folded lines will be updated)
+/^(DUE|SUMMARY|CATEGORIES|DESCRIPTION|LAST-MODIFIED)/ && type { next } # skip for now, we will write updated fields at the end
+/^SEQUENCE/ && type                                           { seq = $2; next } # store sequence number and skip
+/^END:/ && type == $2 {
+  seq = seq ? seq + 1 : 1;
+  print "SEQUENCE:" seq;
+  print "LAST-MODIFIED:" zulu;
+  if (due) print "DUE;VALUE=DATE:" due;
+  print_fold("SUMMARY:",     summary,       i, s);
+  print_fold("CATEGORIES:",  categories,    i, s);
+  print_fold("DESCRIPTION:", desc,          i, s);
+  type = "";
+}
+{ print }

src/main.sh

@@ -0,0 +1,302 @@
+#!/bin/sh
+
+set -eu
+
+err() {
+  echo "❌ $1" >/dev/tty
+}
+
+if [ -z "${FZF_VJOUR_USE_EXPORTED:-}" ]; then
+  # Read configuration
+  CONFIGFILE="$HOME/.config/fzf-vjour/config"
+  if [ ! -f "$CONFIGFILE" ]; then
+    err "Configuration '$CONFIGFILE' not found."
+    exit 1
+  fi
+  # shellcheck source=/dev/null
+  . "$CONFIGFILE"
+  if [ -z "${ROOT:-}" ] || [ -z "${SYNC_CMD:-}" ] || [ -z "${COLLECTION_LABELS:-}" ]; then
+    err "Configuration is incomplete."
+    exit 1
+  fi
+  export ROOT
+  export SYNC_CMD
+  export COLLECTION_LABELS
+
+  # Tools
+  if command -v "fzf" >/dev/null; then
+    FZF="fzf"
+  else
+    err "Did not find the command-line fuzzy finder fzf."
+    exit 1
+  fi
+  export FZF
+
+  if command -v "uuidgen" >/dev/null; then
+    UUIDGEN="uuidgen"
+  else
+    err "Did not find the uuidgen command."
+    exit 1
+  fi
+  export UUIDGEN
+
+  if command -v "bat" >/dev/null; then
+    CAT="bat"
+  elif command -v "batcat" >/dev/null; then
+    CAT="batcat"
+  fi
+  CAT=${CAT:+$CAT --color=always --style=numbers --language=md}
+  CAT=${CAT:-cat}
+  export CAT
+
+  ### AWK SCRIPTS
+  AWK_ALTERTODO=$(
+    cat <<'EOF'
+@@include src/awk/altertodo.awk
+EOF
+  )
+  export AWK_ALTERTODO
+
+  AWK_EXPORT=$(
+    cat <<'EOF'
+@@include src/awk/export.awk
+EOF
+  )
+  export AWK_EXPORT
+
+  AWK_GET=$(
+    cat <<'EOF'
+@@include src/awk/get.awk
+EOF
+  )
+  export AWK_GET
+
+  AWK_LIST=$(
+    cat <<'EOF'
+@@include src/awk/list.awk
+EOF
+  )
+  export AWK_LIST
+
+  AWK_NEW=$(
+    cat <<'EOF'
+@@include src/awk/new.awk
+EOF
+  )
+  export AWK_NEW
+
+  AWK_UPDATE=$(
+    cat <<'EOF'
+@@include src/awk/update.awk
+EOF
+  )
+  export AWK_UPDATE
+  ### END OF AWK SCRIPTS
+  FZF_VJOUR_USE_EXPORTED="yes"
+  export FZF_VJOUR_USE_EXPORTED
+fi
+
+__lines() {
+  find "$ROOT" -type f -name '*.ics' -print0 | xargs -0 -P 0 \
+    awk \
+    -v collection_labels="$COLLECTION_LABELS" \
+    -v flag_open="🔲" \
+    -v flag_completed="✅" \
+    -v flag_journal="📘" \
+    -v flag_note="🗒️" \
+    "$AWK_LIST" |
+    sort -g -r
+}
+
+# Program starts here
+if [ "${1:-}" = "--help" ]; then
+  echo "Usage: $0 [OPTION]"
+  echo ""
+  echo "You may specify at most one option."
+  echo "  --help                 Show this help and exit"
+  echo "  --tasks                Show tasks only"
+  echo "  --no-tasks             Ignore tasks"
+  echo "  --notes                Show notes only"
+  echo "  --no-notes             Ignore notes"
+  echo "  --journal              Show journal only"
+  echo "  --no-journal           Ignore journal"
+  echo "  --completed            Show completed tasks only"
+  echo "  --no-completed         Ignore completed tasks"
+  echo "  --new                  Create new entry"
+  echo ""
+  echo "The following options are for internal use."
+  echo "  --reload                            Reload list"
+  echo "  --preview <selection>               Generate preview"
+  echo "  --delete <selection>                Delete selected entry"
+  echo "  --decrease-priority <selection>     Decrease priority of selected task"
+  echo "  --increase-priority <selection>     Increase priority of selected task"
+  echo "  --toggle-completed <selection>      Toggle completion flag of task"
+  exit
+fi
+
+# Command line arguments to be self-contained
+# Generate preview of file from selection
+if [ "${1:-}" = "--preview" ]; then
+  name=$(echo "$2" | cut -d ' ' -f 3)
+  file="$ROOT/$name"
+  awk -v field="DESCRIPTION" "$AWK_GET" "$file" |
+    $CAT
+  exit
+fi
+# Delete file from selection
+if [ "${1:-}" = "--delete" ]; then
+  name=$(echo "$2" | cut -d ' ' -f 3)
+  file="$ROOT/$name"
+  summary=$(awk -v field="SUMMARY" "$AWK_GET" "$file")
+  while true; do
+    printf "Do you want to delete the entry with the title \"%s\"? (yes/no): " "$summary" >/dev/tty
+    read -r yn
+    case $yn in
+    "yes")
+      rm -v "$file"
+      break
+      ;;
+    "no")
+      break
+      ;;
+    *)
+      echo "Please answer \"yes\" or \"no\"." >/dev/tty
+      ;;
+    esac
+  done
+fi
+# Generate new entry
+if [ "${1:-}" = "--new" ]; then
+  collection=$(echo "$COLLECTION_LABELS" | tr ';' '\n' | fzf --delimiter='=' --with-nth=2 --accept-nth=1)
+  file=""
+  while [ -f "$file" ] || [ -z "$file" ]; do
+    uuid=$($UUIDGEN)
+    file="$ROOT/$collection/$uuid.ics"
+  done
+  tmpmd=$(mktemp --suffix='.md')
+  {
+    echo "::: |> <!-- keep this line to associate the entry to _today_ -->"
+    echo "::: <| <!-- specify the due date for to-dos, can be empty, a date string, or even \"next Sunday\" -->"
+    echo "# <!-- write summary here -->"
+    echo "> <!-- comma-separated list of categories -->"
+    echo ""
+  } >"$tmpmd"
+  checksum=$(cksum "$tmpmd")
+
+  # Open in editor
+  $EDITOR "$tmpmd" >/dev/tty
+
+  # Update if changes are detected
+  if [ "$checksum" != "$(cksum "$tmpmd")" ]; then
+    tmpfile="$tmpmd.ics"
+    awk -v uid="$uuid" "$AWK_NEW" "$tmpmd" >"$tmpfile"
+    mv "$tmpfile" "$file"
+  fi
+  rm "$tmpmd"
+fi
+# Toggle completed flag
+if [ "${1:-}" = "--toggle-completed" ]; then
+  name=$(echo "$2" | cut -d ' ' -f 3)
+  file="$ROOT/$name"
+  tmpfile=$(mktemp)
+  awk "$AWK_ALTERTODO" "$file" >"$tmpfile"
+  mv "$tmpfile" "$file"
+fi
+# Increase priority
+if [ "${1:-}" = "--increase-priority" ]; then
+  name=$(echo "$2" | cut -d ' ' -f 3)
+  file="$ROOT/$name"
+  tmpfile=$(mktemp)
+  awk -v delta="1" "$AWK_ALTERTODO" "$file" >"$tmpfile"
+  mv "$tmpfile" "$file"
+fi
+# Decrease priority
+if [ "${1:-}" = "--decrease-priority" ]; then
+  name=$(echo "$2" | cut -d ' ' -f 3)
+  file="$ROOT/$name"
+  tmpfile=$(mktemp)
+  awk -v delta="-1" "$AWK_ALTERTODO" "$file" >"$tmpfile"
+  mv "$tmpfile" "$file"
+fi
+if [ "${1:-}" = "--reload" ]; then
+  __lines
+  exit
+fi
+
+query="${FZF_QUERY:-}"
+if [ "${1:-}" = "--no-completed" ]; then
+  query="!✅"
+fi
+if [ "${1:-}" = "--completed" ]; then
+  query="✅"
+fi
+if [ "${1:-}" = "--tasks" ]; then
+  query="✅ | 🔲"
+fi
+if [ "${1:-}" = "--no-tasks" ]; then
+  query="!✅ !🔲"
+fi
+if [ "${1:-}" = "--notes" ]; then
+  query="🗒️"
+fi
+if [ "${1:-}" = "--no-notes" ]; then
+  query="!🗒️"
+fi
+if [ "${1:-}" = "--journal" ]; then
+  query="📘"
+fi
+if [ "${1:-}" = "--no-journal" ]; then
+  query="!📘"
+fi
+query=${query:-!✅}
+query=$(echo "$query" | xargs)
+
+selection=$(
+  __lines | $FZF --ansi \
+    --query="$query " \
+    --no-sort \
+    --no-hscroll \
+    --ellipsis='' \
+    --with-nth=4.. \
+    --accept-nth=3 \
+    --preview="$0 --preview {}" \
+    --bind="ctrl-r:reload-sync($0 --reload)" \
+    --bind="ctrl-alt-d:become($0 --delete {})" \
+    --bind="ctrl-x:become($0 --toggle-completed {})" \
+    --bind="alt-up:become($0 --increase-priority {})" \
+    --bind="alt-down:become($0 --decrease-priority {})" \
+    --bind="ctrl-n:become($0 --new)" \
+    --bind="alt-0:change-query(!✅)" \
+    --bind="alt-1:change-query(📘)" \
+    --bind="alt-2:change-query(🗒️)" \
+    --bind="alt-3:change-query(✅ | 🔲)" \
+    --bind="ctrl-s:execute($SYNC_CMD ; printf 'Press <enter> to continue.'; read -r tmp)"
+)
+if [ -z "$selection" ]; then
+  return 0
+fi
+
+file="$ROOT/$selection"
+
+if [ ! -f "$file" ]; then
+  echo "ERROR: File '$file' does not exist!" >/dev/tty
+  return 1
+fi
+
+# Prepare file to be edited
+filetmp=$(mktemp --suffix='.md')
+awk "$AWK_EXPORT" "$file" >"$filetmp"
+checksum=$(cksum "$filetmp")
+
+# Open in editor
+$EDITOR "$filetmp" >/dev/tty
+
+# Update only if changes are detected
+if [ "$checksum" != "$(cksum "$filetmp")" ]; then
+  file_new="$filetmp.ics"
+  awk "$AWK_UPDATE" "$filetmp" "$file" >"$file_new"
+  mv "$file_new" "$file"
+fi
+rm "$filetmp"
+
+exec "$0"