#!/bin/bash

#*****************************************************#
# Script for making image files from lilypond source  #
# suitable for use as musical examples to insert in a #
# document or web page.                               #
#*****************************************************#

# get filename from first argument
srcfile="`basename $1`"	

# get filename without .ly extension
STEM="`basename $1 .ly`"

# determine output directory
OUTDIR="`dirname $1`"

# ask for output resolution 
echo -n "Enter output resolution in DPI (72, 100, 300, 600, etc.): "
# gather resolution input
read RES
echo "Resolution is set to $RES"

echo -n "Would you like a transparent background? (y/N): "
read TRANSPARENCY

if [[ ( "$TRANSPARENCY" == "yes" ) || ( "$TRANSPARENCY" == "y" ) || ( "$TRANSPARENCY" == "Y" )]]
  then
    echo "Background is set to transparent"
    echo -n "Enter desired output format (png or gif): "
    read TRANSFORMAT
    echo "Output format is set to $TRANSFORMAT"
    cd $OUTDIR
    lilypond --format=png -dresolution=$RES $srcfile
    pngtopnm $STEM.png > $STEM.pnm
    pnmcrop -white $STEM.pnm > $STEM-cropped.pnm
      if [ "$TRANSFORMAT" == "png" ]
        then
          pnmto$TRANSFORMAT -transparent '#ffffff' $STEM-cropped.pnm > $STEM.$TRANSFORMAT
        else
          ppmto$TRANSFORMAT -transparent '#ffffff' $STEM-cropped.pnm > $STEM.$TRANSFORMAT
      fi

    eog $STEM.$TRANSFORMAT &

  else
    
    # ask for desired final output format
    echo -n "Enter desired output format (jpeg, png, tiff, gif, pcx, bmp, pgm): "
    # gather format input
    read FORMAT
    echo "Output format is set to $FORMAT"
    cd $OUTDIR
    lilypond --format=png -dresolution=$RES $srcfile
    pngtopnm $STEM.png > $STEM.pnm
    pnmcrop -white $STEM.pnm > $STEM-cropped.pnm
      if [[ ( "$FORMAT" == "tiff" ) || ( "$FORMAT" == "png" ) ]]
        then
          pnmto$FORMAT $STEM-cropped.pnm > $STEM.$FORMAT
        else
          ppmto$FORMAT $STEM-cropped.pnm > $STEM.$FORMAT
      fi
    # open final image as background process in "Eye of Gnome" Image Viewer
    eog $STEM.$FORMAT &
fi

# removes pnm and ps files
rm *.pnm $STEM.ps