#2648 - Fix issue when build/watch tasks are imported without sub-tasks defined

tasks/README.md

@@ -10,6 +10,8 @@
 These tasks can be imported into your own gulpfile allowing you to avoid using Semantic's build tools
 
 ```javascript
-var watch = require('path/to/semantic/tasks/watch');
-gulp.task('watch ui', 'Watch Semantic UI', watch);
+var
+  watch = require('path/to/semantic/tasks/watch')
+;
+gulp.task('watch ui', watch);
 ```

tasks/build.js

@@ -8,9 +8,14 @@ var
   // config
   config       = require('./config/user'),
   install      = require('./config/project/install')
-
 ;
 
+// add sub-tasks
+if(config.rtl) {
+  require('./collections/rtl')(gulp);
+}
+require('./collections/build')(gulp);
+
 module.exports = function(callback) {
 
   console.info('Building Semantic');

tasks/collections/build.js

@@ -0,0 +1,19 @@
+/*******************************
+        Define Sub-Tasks
+*******************************/
+
+module.exports = function(gulp) {
+
+  var
+    // build sub-tasks
+    buildJS      = require('./../build/javascript'),
+    buildCSS     = require('./../build/css'),
+    buildAssets  = require('./../build/assets')
+  ;
+
+  // in case these tasks are undefined during import, less make sure these are available in scope
+  gulp.task('build-javascript', 'Builds all javascript from source', buildJS);
+  gulp.task('build-css', 'Builds all css from source', buildCSS);
+  gulp.task('build-assets', 'Copies all assets from source', buildAssets);
+
+};

tasks/collections/rtl.js

@@ -0,0 +1,16 @@
+/*******************************
+        Define Sub-Tasks
+*******************************/
+
+module.exports = function(gulp) {
+
+  var
+    // rtl
+    buildRTL     = require('./../rtl/build'),
+    watchRTL     = require('./../rtl/watch')
+  ;
+
+  gulp.task('watch-rtl', 'Build all files as RTL', watchRTL);
+  gulp.task('build-rtl', 'Watch files as RTL ', buildRTL);
+
+};

tasks/watch.js

@@ -44,7 +44,10 @@ var
 
 ;
 
-// add tasks that shouldn't be exposed to end-user
+// add tasks referenced using gulp.run (sub-tasks)
+if(config.rtl) {
+  require('./collections/rtl')(gulp);
+}
 require('./collections/internal')(gulp);