node-gs

NodeJS wrapper for gs (GhostScript).

Built upon node-gs by Nick Campbell and many others.

Installation

npm install --save node-gs

Usage

Sample usage:

    var gs = require( 'node-gs' );

    gs()
        .batch()
        .nopause()
        .option( '-r' + 50 * 2 )
        .option( '-dDownScaleFactor=2' )
        .device( 'png16m' )
        .input( '/tmp/' + fileName )
		.output( '/tmp/' + fileName + '-%d.png' )
        // optional:
        .executablePath( 'ghostscript/bin/./gs' )
        .exec( function ( error, stdout, stderr ) {
            if ( error ) {
                // ¯\_(ツ)_/¯
            } else {
                // ( ͡° ͜ʖ ͡°)
            }
        });

Usage with piping input and output (for use within the NodeJS app):

    var gs = require( 'node-gs' ),
        fs = require( 'fs' ),
        input = fs.readFileSync( '/tmp/' + fileName );

    if ( input ) {
        gs()
            .option( '-r' + 50 * 2 )
            .option( '-dDownScaleFactor=2' )
            .device( 'png16m' )
            .exec( input, function ( error, stdout, stderr ) {
                if ( error ) {
                    // ¯\_(ツ)_/¯
                } else {
                    // ( ͡° ͜ʖ ͡°)
                }
            });
    }

API

• batch - set batch option
• command - tell gs to interpret PostScript code
• currentDirectory / p - tell gs to use current directory for libraries first
• diskfonts - set diskfonts option
• define - set definition with value
• device - device - defaults to txtwrite
• executablePath - path to the Ghostscript executable files (example: ghostscript/bin/./gs)
• include - set path to gs_init.ps file (portable Ghostscript) array of include paths
• input - file or data for stdin (when invoked with gs( '-' ))
• nobind - set nobind option
• nocache - set nocache option
• nodisplay - set nodisplay option
• nopause - set nopause option
• option - add any option that is not provided through the methods
• output - file - defaults to - which represents stdout
• page - number - tell gs to process single page
• pagecount - return number of pages
• pages - numbers - tell gs to process page range
• papersize - set the paper size
• quiet / q - tell gs to be quiet
• reset - reset gs to initial state
• resolution / res / r - set device resolution
• safer - set gs to run in safe mode
• exec - callback

Events

    var gs = require( 'node-gs' );

    gs( inputFile )
        .output( outputFile )
        .on( 'pages', function ( from, to ) {
            console.debug( '[sg] Processing pages ' + from + '-' * to );
        })
        .on( 'page', function ( page ) {
            console.debug( '[sg] Processing page:', page );
        })
        .on( 'data', function ( data ) {
            console.log( '[sg] Data:', data.toString() );
        })
        .exec( function ( err, data ) {
            console.log( '[sg] Data:', data.toString() );
        });

License

MIT - http://miro.mit-license.org/