From bbb97b81c759aed5b6bd8c9dcc7ce958a3469cbd Mon Sep 17 00:00:00 2001
From: Hyperling <me@hyperling.com>
Date: Thu, 13 Mar 2025 05:57:16 -0700
Subject: [PATCH] Add system checks and folder creations. Make the conversion
 to mp3 more abstract.

---
 refactor_music_library.sh | 66 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 58 insertions(+), 8 deletions(-)

diff --git a/refactor_music_library.sh b/refactor_music_library.sh
index 21dc045..49fd7f7 100644
--- a/refactor_music_library.sh
+++ b/refactor_music_library.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # 2025 Hyperling
-# Clean up a music library.
+# Clean up a music library. Improved version of rename_music_files.sh.
 
 # Steps:
 # 0) Ensure an OLD folder exists, it is what will be refactored.
@@ -10,20 +10,70 @@
 #    - Name parent folder as "${YEAR} - ${ALBUM}" if both exist, otherwise just one or the other "${YEAR}${ALBUM}".
 #    - Name grandparent folder as "${ARTIST} - ${GENRE}" if both exist, otherwise "${ARTIST}${GENRE}".
 
-# TODO List
+# TODO list:
 # - Organize tracks by Artist + Album folders.
 # - Name parent folder as "$YEAR - $ALBUM" if both exist, otherwise just one or the other.
-# - Name grandparent folder as ARTIST if it exists, otherwise GENRE. 
+# - Name grandparent folder as ARTIST if it exists, otherwise GENRE.
 
-# If we are in OLD, go up one level.
+## Facts and Variables ##
+
+PROG="$(basename -- "${BASH_SOURCE[0]}")"
+
+FAIL=".$PROG.exit-error"
+
+OLD="`pwd`/OLD"
+NEW="`pwd`/NEW"
+INT="`pwd`/INTERIM"
+
+## Checks and Setup ##
+
+# System Packages #
+echo "- Checking if necessary tools are installed."
+function needed_progs {
+	cat <<- EOF
+		ffmpeg
+		exiftool
+	EOF
+}
+needed_progs | while read prog; do
+	if [[ -z "`which $prog`" ]]; then
+		echo "ERROR: $prog not found, please install."
+		touch .$PROG.exit-error
+	fi
+done
+if [[ -e .$PROG.exit-error ]]; then
+	rm -rf .$PROG.exit-error
+	exit 1
+fi
+echo "  - Tools are available."
+
+# Old Directory #
+echo "- Checking whether OLD directory exists."
 if [[ "`pwd`"== */OLD ]]; then
+	echo "  - We are in the folder, moving up a directory."
   cd ..
 fi
-
 if [[ ! -d OLD ]]; then
-  echo "ERROR: Could not find a folder named 'OLD', please create it and add your library there."
+	echo "ERROR: Could not find a folder named 'OLD'."
+	echo "       Please create it and add your library there."
 fi
+echo "  - Folder exists appropriately."
+
+# Other Directories #
+echo "- Ensuring working directories NEW and INTERIM exist."
+mkdir -pv $NEW $INT
+
+## Convert Media ##
+
+echo "- Convert all files to mp3."
+find "$OLD" ! -name "*".mp3 | while read file; do
+	ffmpeg -nostdin -hide_banner -loglevel quiet -i "$file" "$file".converted.mp3
+done
+echo "  - Done creating mp3s."
+
+## Transform Media ##
+
+echo "- Moving INTERIM files to NEW."
 
 
-echo "Convert m4a's to mp3's."
-ls *.m4a | while read m4a; do ffmpeg -nostdin -hide_banner -loglevel quiet -i "$m4a" "$m4a".mp3; done
+echo "- Copying OLD files to NEW."