justplaythegoddamnpart: Add a program to download really friggin barebones playlists

justplaythegoddamnpart

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+#! /bin/bash
+#
+# justplayit
+# Copyright (C) 2019 Vintage Salt <rehashedsalt@cock.li>
+#
+# Distributed under terms of the MIT license.
+#
+
+# Variables
+_name="$(basename -- "$0")"
+_tmpdir="${XDG_CACHE_HOME:-$HOME/.cache}/$_name"
+_tmpfile="$_tmpdir/tmpfile"
+_playlistdir="$_tmpdir"/playlist
+_debug=1
+
+# Helper functions
+debug() {
+	[ -z "$1" ] && return 1
+	[ -z "$_debug" ] && return 0
+	log "debug: $1"
+}
+log() {
+	[ -z "$1" ] && return 1
+	printf "%s: %s\\n" \
+		"$_name" \
+		"$1"
+}
+error() {
+	[ -z "$1" ] && return 1
+	[ -z "$2" ] && return 2
+	log "$1"
+	exit "${2:-1}"
+}
+validatedeps() {
+	for prog in "$@"; do
+		if ! command -v "$prog" > /dev/null 2>&1; then
+			_return="$prog"
+			return 1
+		fi
+	done
+	return 0
+}
+
+# Traps
+trapexit() {
+	kill $(jobs -p) > /dev/null 2>&1
+	#[ -n "$_tmpdir" ] && rm "$_tmpfile"* > /dev/null 2>&1
+}
+
+# Critical functions
+clearcache() {
+	[ -n "$_playlistdir" ] && rm "$_playlistdir"/* > /dev/null 2>&1
+	log "Cache has been emptied"
+}
+helptext() {
+	cat << EOF
+Usage: $_name [OPTION]
+Use youtube-dl and audacious to queue up a playlist given a file of only search
+queries.
+  -c			Clears the cache (which can become quite large)
+  -f <file>		The playlist file to load
+  -r <directory>	Start up rofi, if installed, and present a listing of
+			all .ytp files in the given directory
+  -s			Shuffle the playlist
+  -h			Print this help text
+
+Copyright (c) 2019 rehashedsalt@cock.li
+Licensed under the MIT license
+EOF
+}
+rofimenu() {
+	validatedeps rofi || error "$_return is not currently installed" 1
+	error "Not yet implemented" 1
+	return 0
+}
+playlist() {
+	[ -z "$1" ] && return 1
+	[ -f "$1" ] || error "Attempted to access non-file playlist \"$1\"" 50
+	[ -r "$1" ] || error "Cannot read playlist \"$1\"" 51
+	while read line; do
+		[ -z "$line" ] && continue
+		rm "$_tmpfile"* > /dev/null 2>&1
+		filename="$_playlistdir/${line//[^ a-zA-Z0-9\[\]|()_-]/}"
+		if ! [ -f "$filename" ]; then
+			log "Finding a song for \"$line\""
+			youtube-dl \
+				--add-metadata \
+				--audio-format "best" \
+				--geo-bypass \
+				--playlist-items 1 \
+				-x \
+				-o "$_tmpfile.%(ext)s" \
+				ytsearch:"$line" \
+				> /dev/null 2>&1 &
+			wait
+			mv "$_tmpfile"* "$filename"
+		fi
+		audacious -e "$filename"
+	done < <(if [ -n "$_optshuffle" ]; then shuf "$1"; else cat "$1"; fi)
+	log "Finished building queue"
+}
+
+# Main
+main() {
+	# Boostrapping and setup
+	validatedeps basename mktemp || error "Critical dependency $_return was not met" 1
+	mkdir -p "$_tmpdir"
+	mkdir -p "$_playlistdir"
+	trap trapexit EXIT
+
+	# Actual program stuff
+	while getopts ":cf:r:sh" opt; do
+		case $opt in
+			c)
+				clearcache
+				exit $?
+				;;
+			f)
+				_optfile="$OPTARG"
+				;;
+			r)
+				_optrofi=1
+				;;
+			s)
+				_optshuffle=1
+				;;
+			h)
+				helptext
+				exit $?
+				;;
+			:)
+				error "Option requires argument: -$OPTARG" 2
+				;;
+			*)
+				error "Invalid option: -$OPTARG" 2
+				;;
+		esac
+	done
+	debug "Temporary directory is \"$_tmpdir\""
+	debug "Playlist directory is \"$_playlistdir\""
+	debug "Temporary file is \"$_tmpfile\""
+	[ -n "$_optshuffle" ] && debug "Shuffling playlist"
+
+	if [ -n "$_optrofi" ]; then rofimenu; exit $?; fi
+	if [ -n "$_optfile" ]; then playlist "$_optfile"; exit $?; fi
+	error "Nothing to do" 0
+}
+
+main "$@"
+