Add system checks and folder creations. Make the conversion to mp3 more abstract.
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		@@ -1,6 +1,6 @@
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#!/usr/bin/env bash
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# 2025 Hyperling
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# Clean up a music library.
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# Clean up a music library. Improved version of rename_music_files.sh.
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# Steps:
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# 0) Ensure an OLD folder exists, it is what will be refactored.
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@@ -10,20 +10,70 @@
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#    - Name parent folder as "${YEAR} - ${ALBUM}" if both exist, otherwise just one or the other "${YEAR}${ALBUM}".
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#    - Name grandparent folder as "${ARTIST} - ${GENRE}" if both exist, otherwise "${ARTIST}${GENRE}".
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# TODO List
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# TODO list:
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# - Organize tracks by Artist + Album folders.
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# - Name parent folder as "$YEAR - $ALBUM" if both exist, otherwise just one or the other.
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# - Name grandparent folder as ARTIST if it exists, otherwise GENRE. 
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# - Name grandparent folder as ARTIST if it exists, otherwise GENRE.
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# If we are in OLD, go up one level.
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## Facts and Variables ##
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PROG="$(basename -- "${BASH_SOURCE[0]}")"
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FAIL=".$PROG.exit-error"
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OLD="`pwd`/OLD"
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NEW="`pwd`/NEW"
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INT="`pwd`/INTERIM"
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## Checks and Setup ##
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# System Packages #
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echo "- Checking if necessary tools are installed."
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function needed_progs {
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	cat <<- EOF
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		ffmpeg
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		exiftool
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	EOF
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}
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needed_progs | while read prog; do
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	if [[ -z "`which $prog`" ]]; then
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		echo "ERROR: $prog not found, please install."
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		touch .$PROG.exit-error
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	fi
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done
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if [[ -e .$PROG.exit-error ]]; then
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	rm -rf .$PROG.exit-error
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	exit 1
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fi
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echo "  - Tools are available."
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# Old Directory #
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echo "- Checking whether OLD directory exists."
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if [[ "`pwd`"== */OLD ]]; then
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	echo "  - We are in the folder, moving up a directory."
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  cd ..
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fi
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if [[ ! -d OLD ]]; then
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  echo "ERROR: Could not find a folder named 'OLD', please create it and add your library there."
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	echo "ERROR: Could not find a folder named 'OLD'."
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	echo "       Please create it and add your library there."
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fi
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echo "  - Folder exists appropriately."
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# Other Directories #
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echo "- Ensuring working directories NEW and INTERIM exist."
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mkdir -pv $NEW $INT
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## Convert Media ##
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echo "- Convert all files to mp3."
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find "$OLD" ! -name "*".mp3 | while read file; do
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	ffmpeg -nostdin -hide_banner -loglevel quiet -i "$file" "$file".converted.mp3
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done
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echo "  - Done creating mp3s."
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## Transform Media ##
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echo "- Moving INTERIM files to NEW."
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echo "Convert m4a's to mp3's."
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ls *.m4a | while read m4a; do ffmpeg -nostdin -hide_banner -loglevel quiet -i "$m4a" "$m4a".mp3; done
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echo "- Copying OLD files to NEW."
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