Added a grunt task to build js files from xml

Gruntfile.js

@@ -105,6 +105,16 @@ module.exports = function(grunt) {
                 src: 'challenges/html/*.html',
                 dest: 'challenges/pdf/'
             }
+        },
+
+        jsChallenge: {
+            options: {
+
+            },
+            files: {
+                src: 'challenges/xml/*.xml',
+                dest: 'challenges/js/'
+            }
         }
     });
 
@@ -118,8 +128,64 @@ module.exports = function(grunt) {
     grunt.registerTask('phonegap:ios', ['phonegap:login', 'phonegap:build:ios', 'phonegap:logout']);
     grunt.registerTask('phonegap:android', ['phonegap:login', 'phonegap:build:android', 'phonegap:logout']);
     grunt.registerTask('html', ['saxon']);
+    grunt.registerTask('js', ['jsChallenge']);
     grunt.registerTask('pdf', ['saxon','http-server', 'phantomJSScreenShot']);
 
+    grunt.registerMultiTask('jsChallenge', function() {
+        var options = this.options();
+        var npath = require('path');
+        var nfs = require('fs');
+        var Q = require('q');
+        var done = this.async();
+        var exec = require('child_process').exec;
+
+        function process(filepath,dest) {
+            return Q.promise(function(resolve,reject) {
+                var base = npath.basename(filepath, '.html');
+
+                var cmd = [
+                    'node',
+                    '"tools/buildchallenge.js"',
+                    '"' + filepath + '"',
+                    '>',
+                    '"' + dest + '"'
+                ].join(' ');
+
+                // console.log(cmd);
+                // resolve()
+                exec(cmd, function(error, stdout, stderr) {
+                    if (error !== null) {
+                        console.log('exec error: ' + error);
+                        reject(error);
+                    }
+                    resolve();
+                });
+            });
+        }
+
+        this.files.forEach(function(f) {
+            f.src.filter(function(filepath) {
+                // Warn on and remove invalid source files (if nonull was set).
+                if (!grunt.file.exists(filepath)) {
+                    grunt.log.warn('Source file "' + filepath + '" not found.');
+                    return false;
+                } else {
+                    return true;
+                }
+            }).map(function(filepath) {
+                return function() {
+                    var base = npath.basename(filepath, '.xml');
+                    var dest = npath.resolve(f.dest, base) + '.js';
+                    // console.log(filepath);
+                    // console.log(dest);
+                    return process(filepath,dest);
+                };
+            }).reduce(function(pending,promise) {
+                return pending.then(promise);
+            },Q()).then(done,done);
+        });
+    });
+
     grunt.registerMultiTask('saxon', function() {
         var options = this.options();
         var saxonPath = options.saxonPath;

readme.md

@@ -66,9 +66,16 @@ For the phonegap build, copy `pgbuildconfig.example.json` to `pgbuildconfig.json
 
 For iOS, see [Building for iOS](https://github.com/FirstLegoLeague/fllscoring/wiki/Building-for-iOS)
 
-To build js challenge files from the xml description files, use
+(Only) when XML definition files have changed:
+-----------------------------
+
+- run `grunt html`
+- run `grunt pdf`
+- run `grunt js`
+
+This will rebuild html, pdf and js versions of the challenge.
 
-     node tools\buildchallenge.js challenges\xml\2014.xml > challenges\js\2014.js
+These files are also included in the repo: `challenges/html`, `challenges/pdf`, `challenges/js`
 
 Documentation
 -------------
@@ -79,14 +86,6 @@ Documentation
 - [interface](docs/user_interface/readme.md)
 - [internationalization](docs/i18n/readme.md)
 
-Generating HTML and PDF scoresheets
------------------------------
-
-- run `grunt html`
-- run `grunt pdf`
-
-These files are also included in the repo: `challenges/html` and `challenges/pdf`
-
 TODO's
 --------