Implement playlist and download mode

Playlist mode makes the program print the URLs of all songs by the
selected artists. Download mode downloads them in the current directory.

README.md

@@ -16,11 +16,14 @@ Tested on `GNU/Linux`, expected to work on every system with a `POSIX` Shell and
 ## Usage
 After launching the script, if the connection with the music library succeeds a menu with a list of artists will appear.
 Select the artists you want to listen to (with the spacebar) and then press enter.
-`mpv` will fetch the music and reproduce it.
-
+If no option is provided to `vaporget`, `mpv` will fetch the music and reproduce it.
 To pass options (both long and short) directly to `mpv`, use `-m "[mpv_option_1],[mpv_option_2],..."`.
 For example to pass `mpv` options `--shuffle`, `--start=50%` and `-v` use:
 ```
 vaporget -m "shuffle,start=50%,v"
 ```
+If the program is called with `-p`, the list of URLs of the songs by the selected artists will be printed to standard output.
+If the program is called with `-d`, all the songs by the selected artists will be downloaded in the current directory.
+If a combination of `-p` and `-d` is used, only the operation corresponding to the last option written will be executed.
+
 See `MPV(1)` for command line options and interactive use of the music player.

vaporget

@@ -17,6 +17,8 @@
 
 # Global Variables
 WEBSITE="https://vaporwave.ivan.moe/list/"
+USAGE="Usage: $0 [-pdh] [-m \"mpv_option_1[, mpv_option_2, mpv_option_3 ...]]\""
+MODE="play"
 
 ###############################################################################
 # USEFUL FUNCTIONS                                                            #
@@ -78,13 +80,24 @@ handle_term()
 ###############################################################################
 # MAIN SECTION                                                                #
 ###############################################################################
-
 # Parse command line
-while getopts m: f; do
+while getopts pdm:h f; do
 	case $f in
+		p)
+			MODE="playlist"
+		;;
+		d)
+			MODE="download"
+		;;
 		m)
 			MPV_CMDLINE=$(echo "${OPTARG}" | sed -e 's/[[:space:]]//g' -e 's/[^,]\{2,\}/--& /g' -e 's/\(^\|,\)[[:alnum:]]\($\|,\)/ -& /g' -e 's/,//g')
 		;;
+		h)
+			echo "${USAGE}" && exit 0
+		;;
+		\?)
+			echo "${USAGE}" && exit 1
+		;;
 	esac
 done
 shift $(( $OPTIND - 1 ))
@@ -102,4 +115,14 @@ if [ -z "${CHOICES}" ]; then	# User didn't select any artist
 fi
 
 # Play the music
-prepare_playlist "${CHOICES}" | play_music
+case $MODE in
+	"play")
+		prepare_playlist "${CHOICES}" | play_music
+	;;
+	"playlist")
+		prepare_playlist "${CHOICES}" 2>/dev/null
+	;;
+	"download")
+		prepare_playlist "${CHOICES}" | wget -i -
+	;;
+esac