#!/bin/bash
#
# ly2ps
#
# Copyright 2002
#
# D. Michael McIntyre <dmmcintyr@users.sourceforge.net> 
#
# A utility to make quicker work of rendering Lilypond files in .ps format

# edit this string to specify the viewer you wish to use to view/print .ps
# files:
psviewer="kghostview"

if ! (which $psviewer > /dev/null); then
    echo "Could not execute $psviewer...  Please specify a valid .ps viewer."
    line=$(grep -n "psviewer=" `which ly2ps`|cut -d : -f 1)
    script=$(which $0)
    for c in $line;do
        echo "Please edit line $c of this script:"
        echo "    $script"
        exit 1
    done
fi

if [ $# -eq 0 ]; then
    echo "usage:  ly2ps [filename]"
    echo "(.ly extension is assumed, and may be omitted)"
    exit 1
fi

logfile="/tmp/$(basename $1).lilypond.errors"

wd=$(dirname $1)
[ "$wd" == "." ]&&wd=$PWD||cd $wd
if [ "$PWD" != "$wd" ]; then
    echo "Unable to change into directory $wd...  Aborting..."
    exit 1
fi

random="$RANDOM.$RANDOM.$RANDOM"
touch $random > /dev/null 2>&1
if ! [ -f "$random" ]; then
    echo "You do not have write permissions in $wd...  Aborting..."
    exit 1
fi
rm -f $random > /dev/null 2>&1

[ -f "$1" ]       &&  filename=$1
[ -f "$1.ly" ]    &&  filename="$1.ly"
filename=$(basename $filename)

if [ -z "$filename" ]; then
    echo "Input file $filename doesn't exit..."
    exit 1
fi

base=$(echo $filename|cut -d \. -f 1)

echo "Rendering $filename into $base.ps..."
rm -f $base.ps > /dev/null 2>&1

if (ly2dvi -P $base > $logfile 2>&1)&&[ -f "$base.ps" ]; then
    rm -f  $base.tex $base.dvi
    $psviewer $base.ps
    echo "Success."
else
    echo "Fatal errors encountered!"
    cat $logfile
#    rm -fq $logfile
    echo "Error log saved to $logfile..."
fi