#!/bin/sh -x

# syntax: remove_obsolete.sh [-d <dirname> ]<filename> {...]

# dirname is the name of the output directory, defaults to out

# This script is invoked from a Makefile to remove the lilypond files
# that depend on files that have changed, but that lilypond-book
# doesn't know to rebuild.  So the arguments are the list of filenames
# that make considers to have changed, and the effect of running the
# script is that any file in out/*.ly that refers to any of those
# filenames is removed.  so if you're using the directory out to store
# anything valuable, this is a dangerous script, but if it's being
# used as intended to just be a working directory for lilypond-book,
# the worst that can happen is that lilypond-book might have to run
# lilypond on more stuff than it should have to.

FILES=$@

if [ "F$1" = "F-d" ]
then
    DIR=$2
else
    DIR="out"
fi
ls $DIR/*.ly >/dev/null
if [ "$?" != "0" ]
then
    exit
fi
for FILE in $FILES
do
    if [ "$FILE" = "allparts.lytex" ]
    then
	continue
    fi
    if [ "$FILE" = "-d" ]
    then
	continue
    fi
    grep -l "$FILE" $DIR/*.ly | xargs --verbose rm -f
done