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POGrunt: Watch multiple files, Compile only Changed
 

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    <p>I'm new to Grunt, and so far I'm enjoying it very much. I want Grunt to compile only the changed files when running <code>grunt watch</code></p> <p>In my Grunfile.coffee I currently have (relevant parts).<br> <em>Note: assets/javascript/app.coffee and assets/javascript/app.js are directories</em> </p> <pre><code> coffee: default: expand: true cwd: "assets/javascript/app.coffee" src: ["*.coffee"] dest: "assets/javascript/app.js" ext: ".js" uglify: dev: options: beautify: true compress: false mangle: false preserveComments: 'all' files: "js/app.js": "assets/javascript/app.js/*.js" "js/libs.js": "assets/javascript/libs/*.js" watch: coffeescript: files: 'assets/javascript/**/*.coffee' tasks: ["coffee"] javascript: files: "assets/**/*.js" tasks: ["uglify:dev"] livereload: files: ["Gruntfile.coffee", "js/*.js", "*.php", "css/*.css", "images/**/*.{png,jpg,jpeg,gif,webp,svg}", "js/*.js", ] options: livereload: true </code></pre> <p>There is probably a shorter way around, but I'm compiling app.coffee to app.js first, so that after I distribute my work, people who aren't comfortable with Coffeescript can browse the code in somewhat reasonable manner.</p> <p>The problem with all this is that now that I save a Coffeescript file, I get too many steps ( I think ):</p> <pre><code>&gt;&gt; File "assets/javascript/app.coffee/browse.coffee" changed. Running "coffee:default" (coffee) task File assets/javascript/app.js/browse.js created. File assets/javascript/app.js/filters.js created. Done, without errors. Completed in 0.837s at Tue May 28 2013 12:30:18 GMT+0300 (EEST) - Waiting... OK &gt;&gt; File "assets/javascript/app.js/browse.js" changed. &gt;&gt; File "assets/javascript/app.js/filters.js" changed. Running "uglify:dev" (uglify) task File "js/app.js" created. File "js/libs.js" created. Done, without errors. Completed in 0.831s at Tue May 28 2013 12:30:19 GMT+0300 (EEST) - Waiting... OK &gt;&gt; File "js/app.js" changed. &gt;&gt; File "js/libs.js" changed. Completed in 0.000s at Tue May 28 2013 12:30:19 GMT+0300 (EEST) - Waiting... </code></pre> <p>Currently I'm just setting up my project, but I will have a lot more Coffeescript files, and I don't want Coffeescript to recompile all of the files, on each file change.</p> <p>Furthermore, libs.js has no part in all of this at all, but I guess it is still compiled, because it also matches the "assets/*<em>/</em>.js" pattern.</p> <p>Is there a way to make Grunt compile only the files that have changed ?</p>
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    1. COpossible duplicate of [How do you watch multiple files, but only run task on changed file, in Grunt.js?](http://stackoverflow.com/questions/12063266/how-do-you-watch-multiple-files-but-only-run-task-on-changed-file-in-grunt-js)
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