commit 79930608f2f6c8235ca9a8982fee256cc4f030a0
Author: Ämin Baumeler <amin@indyfac.ch>
Date:   Fri May 30 20:39:19 2025 +0200

    initial commit

diff --git a/fzf-cal b/fzf-cal
new file mode 100755
index 0000000..5149fe3
--- /dev/null
+++ b/fzf-cal
@@ -0,0 +1,96 @@
+#!/bin/sh
+
+set -eu
+
+. "$HOME/.config/fzf-vcal/config"
+
+__load_weeks() {
+  # TODO: Make sensitive to failures. I don't want to miss appointments!
+  file_weeks=$(mktemp)
+  find "$ROOT" -type f -name '*.ics' -print0 |
+    xargs -0 -P0 \
+      awk -f "src/weeks.awk" >"$file_weeks"
+  dates=$(awk -F'|' '{ print $1; print $2 }' "$file_weeks")
+  file_dates=$(mktemp)
+  echo "$dates" | date --file="/dev/stdin" +"%s" >"$file_dates"
+  awk -f "src/merge.awk" "$file_dates" "$file_weeks"
+  rm "$file_weeks" "$file_dates"
+}
+
+if [ -z "${WEEKLY_DATA:-}" ]; then
+  WEEKLY_DATA=$(__load_weeks)
+  export WEEKLY_DATA
+fi
+
+__list() {
+  weeknr=$(date -d "$DISPLAY_DATE" +"%s")
+  weeknr=$(((weeknr - 259200) / 604800)) # shift, because epoch origin is a Thursday
+  files=$(echo "$WEEKLY_DATA" | grep "^$weeknr " | cut -d " " -f 2)
+  dayofweek=$(date -d "$DISPLAY_DATE" +"%u")
+  delta=$((1 - dayofweek))
+  startofweek=$(date -d "$DISPLAY_DATE -$delta days" +"%D")
+  # loop over files
+  sef=$({
+    IFS=';'
+    set -- $files
+    for file in "$@"; do
+      file="$ROOT/$file"
+      awk -f "src/parse.awk" "$file"
+    done
+  })
+  if [ -n "$sef" ]; then
+    sef=$(echo "$sef" | while IFS= read -r line; do
+      set -- $line
+      starttime="$1"
+      shift
+      endtime="$1"
+      shift
+      description="$*"
+      for i in $(seq 0 7); do
+        daystart=$(date -d "$startofweek +$i days 00:00:00" +"%s")
+        dayend=$(date -d "$startofweek +$i days 23:59:59" +"%s")
+        if [ "$starttime" -gt "$daystart" ] && [ "$starttime" -lt "$dayend" ]; then
+          s=$(date -d "@$starttime" +"%H:%M")
+          s="$s -"
+        elif [ "$starttime" -le "$daystart" ] && [ "$endtime" -gt "$daystart" ]; then
+          s="00:00 -"
+        else
+          continue
+        fi
+        if [ "$endtime" -gt "$daystart" ] && [ "$endtime" -lt "$dayend" ]; then
+          e=$(date -d "@$endtime" +"%H:%M")
+          e="- $e"
+        elif [ "$endtime" -ge "$dayend" ] && [ "$starttime" -lt "$dayend" ]; then
+          e="- 00:00"
+        else
+          continue
+        fi
+        echo "$i $s$e >$description"
+      done
+    done)
+  fi
+  sef=$({
+    echo "$sef"
+    seq 0 7
+  } | sort -n)
+  echo "$sef" | awk -v startofweek="$startofweek" -f "src/weekview.awk"
+  #seq -f "$startofweek +%g days" 0 6 |
+  #  LC_ALL=c xargs -I {} date -d "{}" +"%a %e %b %Y"
+}
+
+DISPLAY_DATE="today"
+if [ "${1:-}" = "--date" ]; then
+  DISPLAY_DATE="$2"
+  echo "Jumping to date $2!"
+fi
+DISPLAY_DATE=$(date -d "$DISPLAY_DATE" +"%D")
+DISPLAY_DATE_PREV=$(date -d "$DISPLAY_DATE -1 week" +"%D")
+DISPLAY_DATE_NEXT=$(date -d "$DISPLAY_DATE +1 week" +"%D")
+
+__list |
+  fzf \
+    --tac \
+    --no-sort \
+    --ansi \
+    --bind="ctrl-p:become($0 --date '$DISPLAY_DATE_PREV')" \
+    --bind="ctrl-n:become($0 --date '$DISPLAY_DATE_NEXT')"
diff --git a/src/merge.awk b/src/merge.awk
new file mode 100644
index 0000000..de8a7a5
--- /dev/null
+++ b/src/merge.awk
@@ -0,0 +1,14 @@
+BEGIN { FS="|"; i=0; dlt = -259200; spw = 604800; }
+NR == FNR {
+  i = i + 1;
+  from[i] = int(($1 + dtl)/ spw);
+  getline;
+  to[i] = int(($1 + dlt) / spw);
+  next
+} # Load start and end week numbers from first file
+
+{ for(i=from[FNR]; i<=to[FNR]; i++) {
+    week[i] = week[i] ? week[i] ";" $3 : $3
+  }
+}
+END { for (i in week) print i, week[i]; }
diff --git a/src/parse.awk b/src/parse.awk
new file mode 100644
index 0000000..9502e12
--- /dev/null
+++ b/src/parse.awk
@@ -0,0 +1,58 @@
+function parse(    dt) {
+  # Get timezone information
+  dt = "";
+  for (i=2; i<NF-1; i+=2) {
+    if ($i == "TZID") {
+      dt = "TZ=\"" $(i+1) "\" ";
+      break;
+    }
+  }
+  # Get date/datetime
+  return length($NF) == 8 ?
+    dt $NF :
+    dt gensub(/^([0-9]{8})T([0-9]{2})([0-9]{2})([0-9]{2})(Z)?$/, "\\1 \\2:\\3:\\4\\5", "g", $NF);
+}
+
+function parse_duration(    dt, dta, i, n, a, seps) {
+  n = split($NF, a, /[PTWHMSD]/, seps);
+  delete dta;
+  for (i=2; i<=n; i++) {
+    if(seps[i] == "W") dta["weeks"]   = a[i];
+    if(seps[i] == "H") dta["hours"]   = a[i];
+    if(seps[i] == "M") dta["minutes"] = a[i];
+    if(seps[i] == "S") dta["seconds"] = a[i];
+    if(seps[i] == "D") dta["days"]    = a[i];
+  }
+  dt = a[1] ? a[1] : "+";
+  for (i in dta) {
+    dt = dt " " dta[i] " " i;
+  }
+  return dt;
+}
+
+function print_data(start, dur, end, summary,    cmd) {
+  summary = substr(summary, index(summary, ":") + 1);
+  #gsub("\\\\n",    "\n", summary); # one-liner
+  #gsub("\\\\N",    "\n", summary); # one-liner
+  gsub("\\\\,",    ",",  summary);
+  gsub("\\\\;",    ";",  summary);
+  gsub("\\\\\\\\", "\\", summary);
+  end = dur ? start " " end : end
+  cmd = "date -d '" start "' +\"%s\""
+  cmd | getline start
+  close(cmd)
+  cmd = "date -d '" end "' +\"%s\""
+  cmd | getline end
+  close(cmd)
+  print start, end, summary
+}
+
+BEGIN                 { FS="[:;=]"; }
+/^END:VEVENT/ && inside { print_data(start, dur, end, summary,    cmd); exit }
+/^DTSTART/ && inside  { start = parse(    dt) }
+/^DTEND/ && inside    { end = parse(    dt) }
+/^DURATION/ && inside { end = parse_duration(    dt, dta, i, n, a, seps); dur = 1 }
+/^[^ ]/ && rs { rs = 0 }
+/^ / && rs       { summary = summary substr($0, 2); }
+/^SUMMARY/ && inside  { rs = 1; summary = $0; }
+/^BEGIN:VEVENT/ { inside = 1 }
diff --git a/src/weeks.awk b/src/weeks.awk
new file mode 100644
index 0000000..ee55b88
--- /dev/null
+++ b/src/weeks.awk
@@ -0,0 +1,44 @@
+function parse(    dt) {
+  # Get timezone information
+  dt = "";
+  for (i=2; i<NF-1; i+=2) {
+    if ($i == "TZID") {
+      dt = "TZ=\"" $(i+1) "\" ";
+      break;
+    }
+  }
+  # Get date/datetime
+  return length($NF) == 8 ?
+    dt $NF :
+    dt gensub(/^([0-9]{8})T([0-9]{2})([0-9]{2})([0-9]{2})(Z)?$/, "\\1 \\2:\\3:\\4\\5", "g", $NF);
+}
+
+function parse_duration(    dt, dta, i, n, a, seps) {
+  n = split($NF, a, /[PTWHMSD]/, seps);
+  delete dta;
+  for (i=2; i<=n; i++) {
+    if(seps[i] == "W") dta["weeks"]   = a[i];
+    if(seps[i] == "H") dta["hours"]   = a[i];
+    if(seps[i] == "M") dta["minutes"] = a[i];
+    if(seps[i] == "S") dta["seconds"] = a[i];
+    if(seps[i] == "D") dta["days"]    = a[i];
+  }
+  dt = a[1] ? a[1] : "+";
+  for (i in dta) {
+    dt = dt " " dta[i] " " i;
+  }
+  return dt;
+}
+
+function fn(path,    n, a) {
+  n = split(path, a, "/");
+  return a[n-1] "/" a[n];
+}
+
+BEGIN                 { FS="[:;=]"; OFS="|" }
+BEGINFILE             { inside = 0; dur = 0; start = "ERROR"; end = "ERROR" }
+/^END:VEVENT/         { print start, dur ? start " " end : end, fn(FILENAME,    n, a); nextfile }
+/^DTSTART/ && inside  { start = parse(    dt) }
+/^DTEND/ && inside    { end = parse(    dt) }
+/^DURATION/ && inside { end = parse_duration(    dt, dta, i, n, a, seps); dur = 1 }
+/^BEGIN:VEVENT/       { inside = 1 }
diff --git a/src/weekview.awk b/src/weekview.awk
new file mode 100644
index 0000000..baac960
--- /dev/null
+++ b/src/weekview.awk
@@ -0,0 +1,22 @@
+function c() {
+  return substr($0, index($0, ">") + 1) "  " RED "/" OFF
+}
+BEGIN {
+  GREEN = "\033[1;32m";
+  RED = "\033[1;31m";
+  WHITE = "\033[1;97m";
+  CYAN = "\033[1;36m";
+  FAINT = "\033[2m";
+  OFF = "\033[m";
+}
+/^[0-7] 00:00 -- 00:00/ { dayline = dayline " " c(); next }
+/^[0-7] 00:00 -- / { dayline = dayline " <-|" $4 " " c(); next }
+/^[0-7] [0-9]{2}:[0-9]{2} -- 00:00/ { dayline = dayline " " $2 "|-> " c(); next }
+/^[0-7] [0-9]{2}:[0-9]{2} -- [0-9]{2}:[0-9]{2}/ { dayline = dayline " " $2 " - " $4 " " c(); next }
+/^[0-7]$/ && dayline { print dayline; }
+/^[0-7]$/ {
+  cmd = "date -d '" startofweek " +" $0 " days' +\"%a %e %b %Y\"";
+  cmd | getline dayline;
+  close(cmd);
+  dayline = GREEN dayline ":   " OFF
+}