bin/ptgdp

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#! /bin/bash
#
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# ptgdp - Play the Goddamned Playlist
# Copyright (C) 2019 Vintage Salt <rehashedsalt@cock.li>
#
# Distributed under terms of the MIT license.
#
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# TODO:
# * Reorganize mpd integration into abstract functions
# Variables
_name="$(basename -- "$0")"
_tmpdir="${XDG_CACHE_HOME:-$HOME/.cache}/$_name"
_tmpfile="$_tmpdir/tmpfile-$(cat /dev/urandom | tr -cd 'a-f0-9' | head -c 12)"
_xdguserdirs="${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs"
[ -z "$XDG_MUSIC_DIR" ] && [ -f "$_xdguserdirs" ] && source "$_xdguserdirs"
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_musicdir="${XDG_MUSIC_DIR:-$HOME/Music}"
_ptgdpmusicdir="$_musicdir/${PTGDP_MUSIC_DIR:-PTGDP Songs}"
declare -a _queue
# Helper functions
log() {
[ -z "$1" ] && return 1 # Message body
printf "%s: %s\\n" \
"$_name" \
"$1"
}
error() {
[ -z "$1" ] && return 1 # Message body
# 2: Exit code
printf "%s: \\e[31m%s\\e[0m\\n" \
"$_name" \
"$1"
[ -n "$2" ] && exit "${2:-1}"
}
notify() {
[ -z "$_optrofi" ] && return 0
[ -z "$1" ] && return 1 # Title
[ -z "$2" ] && return 2 # Body
local urg="${3:-normal}" # Urgency
local icon="${4:-dialog-information}" # Icon
local timeout="${5:-3000}" # Timeout in milliseconds
notify-send \
-a "$_name" \
-i "$icon" \
-u "$urg" \
-t "$timeout" \
"$1" \
"$2" > /dev/null 2>&1
}
checkforsong() {
# $1: A song name to validate
[ -z "$1" ] && return 1
# Very rudimentary implementation
# TODO: Make this a lot more thorough, maybe ensure MIME is good
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for file in "$_ptgdpmusicdir/$1"*; do
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if [ -f "$file" ]; then
_return="$file"
return 0
fi
done
return 1
}
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cachesong() {
# $1: A song query to download
# $_return: The relative file path to song from XDG_MUSIC_DIR
# If in a dry run, $_return is the title of the video, if extracted
# Note that this will return 100 if the file is cached, so do not assume only 0 is success
[ -z "$1" ] && return 1
# Clean up tmpfile
rm "$_tmpfile"* > /dev/null 2>&1
sanitize "$1"
filename="$_ptgdpmusicdir/$_return"
if [ -z "$_optdryrun" ]; then
if ! checkforsong "$_return"; then
# We need to download the song
youtube-dl \
--add-metadata \
--audio-format "best" \
--geo-bypass \
--playlist-items 1 \
-x \
-o "$_tmpfile.%(ext)s" \
ytsearch:"$1" \
> /dev/null 2>&1 &
if wait $!; then
for file in "$_tmpfile"*; do
[ -f "$file" ] && local extension="$file"
break
done
extension="${extension##*/}"
extension="${extension##*.}"
filename="$filename.$extension"
mv "$_tmpfile"* "$filename"
_return="$filename"
return 0
else
return 1
fi
else
#_return is already an existing cached file, so just die
return 100
fi
else
output="$(
youtube-dl \
--get-title \
--geo-bypass \
--playlist-items 1 \
ytsearch:"$1" 2>&1
)"
exitcode="$?"
if [ $exitcode -gt 0 ]; then
return 1
fi
if ! [ "$output" = "${output#*WARNING}" ]; then
# Title could not be extracted
unset _return
else
# Title was found
_return="$output"
fi
return 0
fi
}
queuesong() {
# $1: A song query to queue
# returns 0 if successful, 100 if cached, 1 if error
# Adds a song to $_queue
[ -z "$1" ] && return 2
cachesong "$1"
local errorcode=$?
if [ -z "$_optdryrun" ]; then
case $errorcode in
0)
# Downloaded
log "Downloaded song \"$1\""
;;
100)
# Cached
log "Using cached song \"$1\""
;;
*)
# Failed
dlfailure+=1
notify "Could not download song" \
"youtube-dl did not download a song for \"$1\"" \
normal dialog-error 3000
error "Could not download song \"$1\""
continue
;;
esac
_queue+=("$_return")
else
case $errorcode in
0)
# Success
if [ -n "$_return" ]; then
log "$1 - \"$output\""
else
log "$1 parsed, but title could not be extracted"
fi
;;
*)
# Failure
error "Could not find song \"$1\""
;;
esac
fi
return $errorcode
}
execqueue() {
# Plays all songs in _queue
mpc update --wait > /dev/null 2>&1
for file in "${_queue[@]}"; do
file=${file##$_musicdir/}
mpc add "$file" > /dev/null 2>&1 || error "Could not add file: \"$file\""
done
if [ -n "$_optautoplay" ]; then
mpc play > /dev/null 2>&1
unset _optautoplay
fi
}
validatedeps() {
# $@: Dependencies to validate
for prog in "$@"; do
if ! command -v "$prog" > /dev/null 2>&1; then
_return="$prog"
return 1
fi
done
return 0
}
validateline() {
# $1: A line to check for comments or whitespace
# Strictly speaking, this removes all whitespace from the line
# While not *exactly* what I'm looking for, it's sufficient for trimming whitespace lines
local linenows=${1//[[:space:]]}
if ! [ "${1#\#}" = "$1" ] || [ -z "$linenows" ]; then
return 1
fi
return 0
}
validateplaylistenv() {
[ -z "$1" ] && return 1
[ -e "$1" ] || error "Playlist \"$1\" does not exist" 50
[ -f "$1" ] || error "Playlist \"$1\" is not a file" 50
[ -r "$1" ] || error "Cannot read playlist \"$1\"" 51
if [ -z "$_optdownloadonly" ] && ! mpc status > /dev/null 2>&1; then
notify "Could not communicate with MPD" \
"MPD connection was refused. Ensure your configuration is correct and the daemon is currently running." \
normal dialog-error 3000
error "Failed to communicate with MPD" 52
fi
}
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sanitize() {
[ -z "$1" ] && return 1 # String to strip special chars from
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_return="${1//[^ a-zA-Z0-9\[\]|()_-]/}"
}
# Traps
trapexit() {
kill $(jobs -p) > /dev/null 2>&1
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[ -n "$_tmpdir" ] && rm "$_tmpfile"* > /dev/null 2>&1
}
# Critical functions
clearcache() {
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[ -n "$_ptgdpmusicdir" ] && rm "$_ptgdpmusicdir"/* > /dev/null 2>&1
log "Cache has been emptied"
}
helptext() {
cat << EOF
Usage: $_name [OPTION]
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Use youtube-dl and mpc to queue up a playlist given a file of only search
queries. The first result found is the one that will be downloaded. Downloaded
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files are cached in your Music folder under "PTGDP Songs" for offline use.
-f <file> The playlist file to load. The file should be plaintext
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containing a YouTube search query on each line.
Comments are supported and prepended with #
-c Clears the cache (which can become quite large)
-d Download only; don't queue anything up
Conflicts with -p
-D Dry run; parse out all songs, downloaded or not, and
print out the resolved names. Useful for testing, as
YouTube searches can sometimes be finicky.
-p Play the playlist after it is enqueued.
Conflicts with -d
-s Shuffle the playlist
-r <directory> Start up rofi, if installed, and present a listing of
all .gdp files in the given directory. If notify-send
is installed, this will also send notifications
pertaining to playlist status.
-R <directory|file> As above, but also parse out the selected playlist and
present a listing of individual songs. The argument can
be a file in this mode
-h Print this help text
Environment Variables
In addition to XDG-spec variables (XDG_CACHE_HOME, user-dirs.dirs, etc.), ptgdp
also respects an additional variable:
PTGDP_MUSIC_DIR The subdirectory in XDG_MUSIC_DIR to save music to
Copyright (c) 2019 rehashedsalt@cock.li
Licensed under the MIT license
EOF
}
rofimenu() {
validatedeps rofi || error "$_return is not currently installed" 1
if ! [ -d "$_optrofi" ]; then
if [ -z "$_optrofisong" ]; then
error "Could not open directory \"$_optrofi\"" 2
else
[ -f "$_optrofi" ] || error "Could not open file \"$_optrofi\"" 2
rofiplaysong "$_optrofi"
return $?
fi
fi
files=$(find "$_optrofi" -type f -name \*.gdp)
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if [ -n "$files" ]; then
# Strip file suffixes for a cleaner menu
playlists=""
while read file; do
filebase="$(basename -- "$file")"
filebase="${filebase%.gdp}"
[ -n "$playlists" ] && playlists+=$'\n'
playlists+="$filebase"
done <<< "$files"
else
notify "No playlists found" \
"No playlists could be found in directory \"$_optrofi\"." \
normal dialog-error 5000
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error "No playlists found" 61
fi
prompt="$_name list"
[ -n "$_optautplay" ] && prompt="$prompt ap"
choice="$(rofi -dmenu -i -p "$prompt" <<< "$playlists" 2>/dev/null)"
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[ -z "$choice" ] && error "User aborted at selection" 62
if [ -z "$_optrofisong" ]; then
playlist "$_optrofi"/"$choice".gdp
else
rofiplaysong "$_optrofi"/"$choice".gdp
fi
return 0
}
rofiplaysong() {
validateplaylistenv "$1" || return $?
local songs=""
while read line; do
validateline "$line" || continue
if [ -z "$songs" ]; then
songs="$line"
else
songs="$songs"$'\n'"$line"
fi
done < "$1"
IFS=$'\n'
prompt="$_name song"
[ -n "$_optautplay" ] && prompt="$prompt ap"
choice="$(rofi -dmenu -i -p "$prompt" <<< "$songs" 2>/dev/null)"
if [ -z "$choice" ]; then
# Assume user is looking for another list
# Kick him back to the main menu, unless he picked a file
if ! [ "$_optrofi" = "$1" ]; then
rofimenu
else
error "User aborted at selection" 62
fi
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fi
queuesong "$choice"
[ "$?" = "1" ] && return 62
execqueue
return 0
}
playlist() {
validateplaylistenv "$1" || return $?
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[ -z "$_optdryrun" ] && local -a queue # An array of songs to later enqueue into mpd
local -i dlexist=0
local -i dlsuccess=0
local -i dlfailure=0
local -i maxlines=0
while read line; do
validateline "$line" || continue
maxlines+=1
done < "$1"
log "Parsed playlist \"$1\" with $maxlines songs"
while read line; do
[ -z "$line" ] && continue
validateline "$line" || continue
rm "$_tmpfile"* > /dev/null 2>&1
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# Do the do
queuesong "$line"
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# What did we do?
local errorcode=$?
case $errorcode in
0)
dlsuccess+=1
;;
100)
dlexist+=1
;;
*)
dlfailure+=1
;;
esac
done < <(if [ -n "$_optshuffle" ]; then shuf "$1"; else cat "$1"; fi)
if [ "$dlexist" = "0" ] && [ "$dlsuccess" = "0" ] && [ -z "$_optdryrun" ]; then
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notify "Failed to download playlist" \
"The playlist in its entirety could not be downloaded. Ensure that youtube-dl is up to date, you have a valid internet connection, and your search queries pull up results" \
normal dialog-error 10000
elif [ -z "$_optdryrun" ]; then
if ! [ "$dlfailure" = "0" ]; then
error "Some songs failed to download" 0
fi
if [ -z "$_optdownloadonly" ]; then
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notify "Finished downloading playlist" \
"The playlist has been downloaded and will be added to mpd shortly"
log "Finished downloading: $dlexist cached, $dlsuccess downloaded, $dlfailure failed"
execqueue
else
notify "Finished precaching" \
"Your songs have been cached and are ready for offline playback"
log "Finished downloading: $dlexist cached, $dlsuccess downloaded, $dlfailure failed"
fi
else
log "Finished dry run: $dlsuccess succeeded, $dlfailure failed"
fi
}
# Main
main() {
# Boostrapping and setup
validatedeps youtube-dl basename || error "Critical dependency $_return was not met" 1
mkdir -p "$_tmpdir"
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mkdir -p "$_ptgdpmusicdir"
trap trapexit EXIT
# Actual program stuff
while getopts ":cdDf:pr:R:sh" opt; do
case $opt in
c)
clearcache
exit $?
;;
d)
_optdownloadonly=1
;;
D)
_optdryrun=1
;;
f)
_optfile="$OPTARG"
;;
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p)
_optautoplay=1
;;
r)
_optrofi="$OPTARG"
;;
R)
_optrofi="$OPTARG"
_optrofisong=1
;;
s)
_optshuffle=1
;;
h)
helptext
exit $?
;;
:)
error "Option requires argument: -$OPTARG" 2
;;
*)
error "Invalid option: -$OPTARG" 2
;;
esac
done
[ -z "$_optdownloadonly" ] && [ -z "$_optdryrun" ] && ! validatedeps mpc && error "$_return is required outside of dry- and download-only runs"
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[ -n "$_optfile" ] && [ -n "$_optrofi" ] && error "Flags -f and -r conflict" 2
[ -n "$_optdownloadonly" ] && [ -n "$_optautoplay" ] && error "Flags -d and -p conflict" 2
if [ -n "$_optrofi" ]; then rofimenu; exit $?; fi
if [ -n "$_optfile" ]; then playlist "$_optfile"; exit $?; fi
error "Nothing to do" 0
}
main "$@"