install-pngcrush.js

/*global require:true*/
/*global console:true*/
/*global process:true*/
(function(){
  "use strict";

  var os = require( 'os' );

  var which = require( 'which' ),
  pngc, pci, data, url, isWin, isWin64;

  // Credit to Obvious Corp for finding this fix.
  var originalPath = process.env.PATH;
  // NPM adds bin directories to the path, which will cause `which` to find the
  // bin for this package not the actual pngcrush bin.
  process.env.PATH = originalPath.replace(/:[^:]*node_modules[^:]*/g, '');

  isWin = os.platform() === "win32";
  isWin64 = isWin && (os.arch() === "x64");

 // try {
//    pngc = which.sync( "pngcrush" );
 //   if( pngc ){
  //    console.log( "PNGCrush already installed!" );
   //   process.exit();
   // }
  //} catch( e ){
    pci = require( "./lib/pngcrush-installer" );

    var install = function(isWin, isWin64, archived){
      url = pci.getFileURL( isWin, isWin64, archived );

      pci.downloadAndSave( url )
        .then( pci.build )
        .then( pci.move )
        .then( pci.deleteTemp )
        .then( function( _null , err ){
          if( err ){
            console.log( err );
            process.exit(1);
          }
          process.exit(0);
        }).on( 'error' , function( err ) {
          if ( err.detail == '404 - File not found' && !archived ) {
            install( isWin, isWin64, true );
          } else {
            console.log("An error occurred: " + err.detail);
            process.exit(1);
          }
        });
    };

    install( isWin, isWin64, false );

  //}

}());