walk_set_rg

#!/bin/bash

# Walk directories recursively, setting ReplayGain tags in FLAC files when not yet set.

BASEDIR=.

xxargs() {
	str=
	while read line; do
		str="${str} \"${line}\""
	done
	echo "$@${str}"
	sh -c "$@${str}"
}

find -L "$BASEDIR" -type d | sort | while read dir; do
	echo -n "$dir ... "
	flaclist="`find -L "$dir" -maxdepth 1 -type f -iname '*.flac' | sort`"
	if [ "x$flaclist" != "x" ]; then
		tempfile="`mktemp`"
		touch "$tempfile"
		echo "$flaclist" | while read flac; do
			if [ `metaflac --show-tag=REPLAYGAIN_TRACK_PEAK "$flac" | wc -l` -lt 1 ]; then
				rm "$tempfile"
				break
			fi
		done
		if [ -e "$tempfile" ]; then
			echo "Already calculated, skipping."
			rm -f "$tempfile"
		else
			echo "Calculating (`echo "$flaclist" | wc -l` files)..."
			echo "$flaclist" | xargs -d '\n' metaflac --add-replay-gain
		fi
	else
		echo "No FLACs, skipping."
	fi
done