#!/bin/bash

#************************************************************#
# This script runs lilypond on a specified file, keeping all #
# output files in the same directory as the source file      #
#************************************************************#
# Usage: This script allows for the use of the "showLastLength"
# function of Lilypond, where it only runs the last x number of
# measures instead of the whole thing.  To take advantage of this,
# YOU MUST PUT THE FOLLOWING LINE NEAR THE TOP OF YOUR SOURCE FILE:
#
# 	\include "showlast.ly"
#
# Then use the -l flag with an argument in the following format:
#
#   lily -l=R1*12 filename.ly	(12 whole-rest bars)
#   lily -l=R2.*12 filename.ly	(12 dotted-half-rest bars)
#
# Without the -l option, the file should run as usual.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# getopt_simple - Orig by Chris Morgan, stolen from
# the ABS Guide and modified a bit
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
getopt_simple()
{
    until [ -z "$1" ] ; do
	if [ ${1:0:1} = '-' ] ; then
	    tmp=${1:1}               # Strip off leading '-' . . .
	    if [ ${tmp:0:1} = '-' ] ; then
		tmp=${tmp:1}	     # Allow double -
	    fi
	    parameter=${tmp%%=*}     # Extract name.
	    value=${tmp##*=}         # Extract value.
	    eval $parameter=$value
	else
	    filename="$1"
	fi
	shift
    done
}

length='no'
l='no'

quiet='no'
q='no'

getopt_simple "$@"

if [ $q != 'no' ] ; then
    quiet=$q
fi
if [ $quiet != 'no' ] ; then
    quiet='Y'
    exec >& /dev/null
fi

# determine whether the flag is there.  If not then dump
# a % into the showlast.ly file.  If so, then dump the
# showLastLength variable into it.

if [ "$l" == "no" ] ; then
    echo "%" > ~/showlast.ly
  elif [ "$value" != "no" ] ; then
    LENGTH=$value
    echo "showLastLength=$LENGTH" > ~/showlast.ly 
fi

#*********************************#
# Get all the filename info here  #
#*********************************#

# determines the source filename
srcfile=$(basename "$filename")

# removes the extension from source filename
STEM=$(basename "$filename" .ly)

# determines directory
OUTDIR=$(dirname "$filename")

# determines whether running Mac or Linux
OS=$(uname)

# If viewer is open, close it
if [ "$OS" == "Darwin" ]
  then 
    killall Preview
  else
    wmctrl -c "Adobe Reader"
fi

# set Lilypond PATH if OS is Darwin

if [ "$OS" == "Darwin" ] ; then
   export PATH="$PATH:/Applications/LilyPond.app/Contents/Resources/bin/"
fi 

# changes to correct directory
cd "$OUTDIR"

# run lilypond on source file
# add the option to include $HOME b/c that's where the temporary
# showlast.ly is stored.

lilypond --include=$HOME "$srcfile"

# opens pdf and returns to command prompt
if [ "$OS" == "Darwin" ]
  then 
    open "$STEM".pdf
  else
    acroread "$STEM".pdf &
fi
# removes .ps file
rm "$STEM".ps
# removes showlast.ly file
rm ~/showlast.ly