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|
#!/usr/bin/env bash
# terminal application launcher for sway, using fzf
# Based on: https://gitlab.com/FlyingWombat/my-scripts/blob/master/sway-launcher
# https://gist.github.com/Biont/40ef59652acf3673520c7a03c9f22d2a
shopt -s nullglob globstar
set -o pipefail
# shellcheck disable=SC2154
trap 's=$?; echo "$0: Error on line "$LINENO": $BASH_COMMAND"; exit $s' ERR
IFS=$'\n\t'
# Defaulting terminal to urxvt, but feel free to either change
# this or override with an environment variable in your sway config
# It would be good to move this to a config file eventually
TERMINAL_COMMAND="${TERMINAL_COMMAND:="urxvt -e"}"
GLYPH_COMMAND=" "
GLYPH_DESKTOP=" "
HIST_FILE="${XDG_CACHE_HOME:-$HOME/.cache}/${0##*/}-history.txt"
# Get locations of desktop application folders according to spec
# https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
IFS=':' read -ra DIRS <<< "${XDG_DATA_HOME-${HOME}/.local/share}:${XDG_DATA_DIRS-/usr/local/share:/usr/share}"
function describe() {
if [[ $2 == 'command' ]]; then
title=$1
readarray arr < <(whatis -l "$1" 2>/dev/null)
description="${arr[0]}"
description="${description%*-}"
else
title=$(sed -ne '/^Name=/{s/^Name=//;p;q}' "$1")
description=$(sed -ne '/^Comment=/{s/^Comment=//;p;q}' "$1")
fi
echo -e "\033[33m$title\033[0m"
echo "${description:-No description}"
}
function entries() {
# shellcheck disable=SC2068
awk -v pre="$GLYPH_DESKTOP" -F= '
function desktopFileID(filename){
sub("^.*applications/", "", filename);
sub("/", "-", filename);
return filename
}
BEGINFILE{
id=desktopFileID(FILENAME)
if(id in fileIds){
exit;
}else{
fileIds[id]=0
}
application=0;
block="";
a=0
}
/^\[Desktop Entry\]/{block="entry"}
/^Type=Application/{application=1}
/^\[Desktop Action/{
sub("^\\[Desktop Action ", "");
sub("\\]$", "");
block="action";
a++;
actions[a,"key"]=$0
}
/^Name=/{
if(block=="action") {
actions[a,"name"]=$2;
} else {
name=$2
}
}
ENDFILE{
if (application){
print FILENAME "\034desktop\034\033[33m" pre name "\033[0m";
if (a>0)
for (i=1; i<=a; i++)
print FILENAME "\034desktop\034\033[33m" pre name "\033[0m (" actions[i, "name"] ")\034" actions[i, "key"]
}
}' \
$@ </dev/null
# the empty stdin is needed in case no *.desktop files
}
function generate-command() {
# Define the search pattern that specifies the block to search for within the .desktop file
PATTERN="^\\\\[Desktop Entry\\\\]"
if [[ -n $2 ]]; then
PATTERN="^\\\\[Desktop Action ${2%?}\\\\]"
fi
# 1. We see a line starting [Desktop, but we're already searching: deactivate search again
# 2. We see the specified pattern: start search
# 3. We see an Exec= line during search: remove field codes and set variable
# 3. We see a Path= line during search: set variable
# 4. Finally, build command line
awk -v pattern="${PATTERN}" -v terminal_command="${TERMINAL_COMMAND}" -F= '
BEGIN{a=0;exec=0;path=0}
/^\[Desktop/{
if(a){
a=0
}
}
$0 ~ pattern{
a=1
}
/^Terminal=/{
sub("^Terminal=", "");
if ($0 == "true") {
terminal=1
}
}
/^Exec=/{
if(a && !exec){
sub("^Exec=", "");
gsub(" ?%[cDdFfikmNnUuv]", "");
exec=$0;
}
}
/^Path=/{
if(a && !path){
path=$2
}
}
END{
if(path){
printf "cd " path " && "
}
if (terminal){
printf terminal_command " "
}
print exec
}' "$1"
}
case "$1" in
describe | entries | generate-command)
"$@"
exit
;;
esac
touch "$HIST_FILE"
readarray HIST_LINES <"$HIST_FILE"
FZFPIPE=$(mktemp)
PIDFILE=$(mktemp)
trap 'rm "$FZFPIPE" "$PIDFILE"' EXIT INT
# Append Launcher History, removing usage count
(printf '%s' "${HIST_LINES[@]#* }" >>"$FZFPIPE") &
# Load and append Desktop entries
(
for i in "${!DIRS[@]}"; do
if [[ ! -d "${DIRS[i]}" ]]; then
unset -v 'DIRS[$i]'
else
DIRS[$i]="${DIRS[i]}/applications/**/*.desktop"
fi
done
# shellcheck disable=SC2068
entries ${DIRS[@]} >>"$FZFPIPE"
) &
# Load and append command list
(
IFS=:
read -ra path <<<"$PATH"
for dir in "${path[@]}"; do
printf '%s\n' "$dir/"* |
awk -F / -v pre="$GLYPH_COMMAND" '{print $NF "\034command\034\033[31m" pre "\033[0m" $NF;}'
done | sort -u >>"$FZFPIPE"
) &
COMMAND_STR=$(
(
tail -n +0 -f "$FZFPIPE" &
echo $! >"$PIDFILE"
) |
fzf +s -x -d '\034' --nth ..3 --with-nth 3 \
--preview "$0 describe {1} {2}" \
--preview-window=up:3:wrap --ansi
kill -9 "$(<"$PIDFILE")" | tail -n1
) || exit 1
[ -z "$COMMAND_STR" ] && exit 1
# update history
for i in "${!HIST_LINES[@]}"; do
if [[ "${HIST_LINES[i]}" == *" $COMMAND_STR"$'\n' ]]; then
HIST_COUNT=${HIST_LINES[i]%% *}
HIST_LINES[$i]="$((HIST_COUNT + 1)) $COMMAND_STR"$'\n'
match=1
break
fi
done
if ! ((match)); then
HIST_LINES+=("1 $COMMAND_STR"$'\n')
fi
printf '%s' "${HIST_LINES[@]}" | sort -nr >"$HIST_FILE"
command='echo "nope"'
# shellcheck disable=SC2086
readarray -d $'\034' -t PARAMS <<<${COMMAND_STR}
# COMMAND_STR is "<string>\034<type>"
case ${PARAMS[1]} in
desktop)
command=$(generate-command "${PARAMS[0]}" "${PARAMS[3]}")
;;
command)
command="$TERMINAL_COMMAND ${PARAMS[0]}"
;;
esac
swaymsg exec "'$command'"
|
