#!/bin/sh
#
# Create MP3 links with p2p-friendly names
#

mp3path=~/multimedia/sound/mp3
lnpath=~/mp3

usage()
{
    echo "usage: $(basename $0) [-d] [-r]" >&2
    exit 1
}

while getopts ":dr" c
do
    case "$c" in
    d)     mkdirs=1;;
    r)     rebuild=1;;
    :|'?') usage 1;;
    esac
done
if [ $OPTIND -le $# ]; then usage; fi

if [ -n "$rebuild" ]; then rm -rf "$lnpath" || exit 1; fi
if [ ! -d "$lnpath" ]; then mkdir -p "$lnpath" || exit 1; fi

find "$mp3path" -name '*.[Mm][Pp]3' -type f | \
    nawk -v mp3path="$mp3path" -v lnpath="$lnpath" -v mkdirs="$mkdirs" '
BEGIN {
    sub(/[^\/]$/, "&/", mp3path); sub(/[^\/]$/, "&/", lnpath)
    pathpat = "^" mp3path
}
{
    gsub(/["`$\\]/, "\\\\&"); name = $0
    sub(pathpat, "", name); dir = name; gsub(/\//, " - ", name)
    if (mkdirs)
	system("dir=\$(dirname \"" dir "\"); mkdir -p \"" lnpath "\$dir\"; " \
	    "ln -s \"" $0 "\" \"" lnpath "\$dir/" name "\"")
    else
	system("ln -s \"" $0 "\" \"" lnpath name "\"")
}'
.