--copmletion option support

Closes gulpjs#57

bin/gulp.js

@@ -13,6 +13,9 @@ var tasks = argv._;
 var cliPkg = require('../package.json');
 
 var localBaseDir = process.cwd();
+var completion = require('../lib/completion');
+
+if (argv.completion) { return completion.print(argv.completion); }
 
 loadRequires(argv.require, localBaseDir);
 

completion/README.md

@@ -0,0 +1,12 @@
+# Completion for gulp
+> Thanks to grunt team and Tyler Kellen
+
+To enable tasks auto-completion in shell you should add `eval "$(gulp --completion=shell)"` in your `.shellrc` file.
+
+## Bash
+
+Add `eval "$(gulp --completion=bash)"` to `~/.bashrc`.
+
+## Zsh
+
+Add `eval "$(gulp --completion=zsh)"` to `~/.zshrc`.

index.js

@@ -1,6 +1,6 @@
 /*jshint node:true */
 
-"use strict";
+'use strict';
 
 var util = require('util');
 var Orchestrator = require('orchestrator');

lib/completion.js

@@ -0,0 +1,32 @@
+/*
+ * Borrowed from grunt-cli
+ * http://gruntjs.com/
+ *
+ * Copyright (c) 2012 Tyler Kellen, contributors
+ * Licensed under the MIT license.
+ * https://github.com/gruntjs/grunt-init/blob/master/LICENSE-MIT
+ */
+
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+
+exports.print = function(name) {
+    var code = 0;
+    var filepath = path.join(__dirname, '../completion', name);
+    var output;
+    try {
+        output = String(fs.readFileSync(filepath));
+    } catch (err) {
+        code = 5;
+        output = 'echo "Specified gulp shell auto-completion rules ';
+        if (name && name !== 'true') {
+            output += 'for \'' + name + '\' ';
+        }
+        output += 'not found."';
+    }
+
+    console.log(output);
+    process.exit(code);
+};