[cliplumber] Implement conditional feature loading

bin/cliplumber

@@ -9,7 +9,9 @@ die() {
 }
 
 check_exists() {
-    which "$1" > /dev/null 2>&1 || die "$1 doesn't appear to be installed"
+    for c in $@; do
+        which "$c" > /dev/null 2>&1 || return 1
+    done
 }
 
 if ! which wl-paste > /dev/null && [ ! -z "$WAYLAND_DISPLAY" ]; then
@@ -25,36 +27,43 @@ else
 fi
 
 urls="$(echo $clip | grep -o 'https\?://[a-zA-Z0-9~#%&_+=,.?/-]\+')"
-opts="qr
+
-audio search"
+# Check the requirements for every option
-if [ -n "$urls" ]; then
+opts=""
-    opts="$(printf '%s\ndownload\nplay' "$opts")"
+check_exists "$TERM_EMU" "mpv" "youtube-dl" &&
+    opts="$(printf "audio-search\n%s" "$opts")"
+check_exists "dragon" &&
+    opts="$(printf "drag-n-drop\n%s" "$opts")"
+# TODO: check requirements
+if [ -n "$urls" ] && check_exists "youtube-dl"; then
+    check_exists "mpv" &&
+        opts="$(printf "play\n%s" "$opts")"
+    opts="$(printf "download\n%s" "$opts")"
 fi
+check_exists "qrencode" "feh" &&
+    opts="$(printf "qr\n%s" "$opts")"
 
 choice="$(printf "%s" "$opts" | dmenu -p "$(printf "%s" "$clip" | cut -c 1-48)")"
 case "$choice" in
     "qr")
-        check_exists "qrencode"
-        check_exists "feh"
         printf "%s" "$clip" | qrencode -o - | feh -. -Z --force-aliasing --geometry 400x400 -
         ;;
     # Download supports optional folder target
     "download"*)
-        check_exists "youtube-dl"
         path="$HOME/mus/$(printf "%s" "$choice" | cut -d " " -f 2-)"
         [ -d "$path" ] || mkdir -p "$path"
         cd "$path" || exit
         youtube-dl -x --audio-format mp3 --no-playlist -o "%(title)s.%(ext)s" "$clip" 2>&1 | grep 'ERROR:' | xargs -n1 -d "\n" notify-send
             #notify-send "Error while downloading: $clip"
         ;;
+    "drag-n-drop"*)
+        dragon -x "$clip"
+        ;;
     "play")
-        check_exists "mpv"
         mpv --ytdl-format='bestvideo[height<=?720]+bestaudio/best' "$clip" 2>&1 | grep 'ERROR:' | xargs -n1 -d "\n" notify-send
 
         ;;
-    "audio search")
+    "audio-search")
-        check_exists "mpv"
-        check_exists "$TERM_EMU"
         "$TERM_EMU" --single-instance mpv --ytdl-format=bestaudio ytdl://ytsearch:"$clip"
         ;;
     *)