small bugfix and code cleanup

to_opus.sh

@@ -18,6 +18,7 @@ print_help() {
   printf "Help: not implemented yet"
 }
 
+delete="false"
 while getopts 'e:dh' flag; do
 	case "${flag}" in
 		e) extension+=("$OPTARG");;
@@ -28,10 +29,10 @@ while getopts 'e:dh' flag; do
 	esac
 done
 
+echo "$delete"
+
 # write array into string
 extension="${extension[*]}"
-# remove leading space
-extension="${extension##+([[:space:]])}"
 # change separator
 extension=${extension// /|}
 
@@ -60,10 +61,10 @@ for file in **/*.@($extension); do
 	is_video=$(ffprobe -v error -select_streams V -show_entries stream=codec_type "$file")
 	if [[ ${#channels[@]} -gt 1 || -n "$is_video" ]]; then
 		ffmpeg -i "$file" -map 0 -map -0:d -map -0:t -c copy -c:a libopus $bitrate_settings-v info -hide_banner "${file%.*}.mkv" &&
-		if [[ delete="true" ]]; then rm "$file"; fi
+		if [[ "$delete"=true ]]; then rm "$file"; fi
 	else
 		ffmpeg -i "$file" $bitrate_settings-v info -hide_banner "${file%.*}.opus" &&
-		if [[ delete="true" ]]; then rm "$file"; fi
+		if [[ "$delete"=true ]]; then rm "$file"; fi
 	fi
 done