scan

#!/bin/sh
#
# Take a pathname as an argument and output a playlist to standard
# output and errors to standard error.
#
# The output format is repeated sequences of:
#
#   <pathname>\t<artist>\t<title>\n
#
# If the tab (\t) or newline (\n) characters appear in a filename,
# unexpected things will happen.

PATHNAME="$1"
# FILTER="-iname *.ogg -o -iname *.aac -o -iname *.cdaudio -o -iname *.mp3 -o -iname *.flac -o -iname *.wav"

if [ -d "$PATHNAME" ]; then
	find -L "$PATHNAME" $FILTER -type f
else
	cat "$PATHNAME"
fi | sed -n '
{
# /[<num>[.]] <artist> - <title>.ext
s:/\([0-9]\+.\? \+\)\?\([^/]*\) \+- \+\([^/]*\)\.[a-zA-Z0-9]*$:\0\t\2\t\3:p
t

# /<artist> - <album>[/Disc <n>.*]/[<num>[.]] <title>.ext
s:/\([^/]*\) \+- \+\([^/]*\)\(/Disc [0-9][^/]*\)\?/\([0-9]\+.\? \+\)\?\([^/]*\)\.[a-zA-Z0-9]*$:\0\t\1\t\5:p
t

# /[<num>[.]] <name>.ext
s:/\([0-9]\+.\? \+\)\?\([^/]*\)\.[a-zA-Z0-9]*$:\0\t\t\2:p
}
'