init

.gitignore

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+# Compiled source #
+###################
+*.com
+*.class
+*.dll
+*.exe
+*.o
+*.so
+
+# Packages #
+############
+# it's better to unpack these files and commit the raw source
+# git has its own built in compression methods
+*.7z
+*.dmg
+*.gz
+*.iso
+*.jar
+*.rar
+*.tar
+*.zip
+
+# Logs and databases #
+######################
+*.log
+*.sql
+*.sqlite
+
+# OS generated files #
+######################
+.DS_Store*
+ehthumbs.db
+Icon?
+Thumbs.db
+
+# Node.js #
+###########
+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+
+pids
+logs
+results
+
+node_modules
+npm-debug.log
+
+# Git #
+#######
+*.orig
+*.BASE.*
+*.BACKUP.*
+*.LOCAL.*
+*.REMOTE.*
+
+# Components #
+##############
+
+/build
+/components

.npmignore

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+test

.travis.yml

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+language: node_js
+node_js:
+- "0.11"

README.md

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+# Component Koa Middleware
+
+Middleware for Component to be used with Koa. This will rebuild the `.js` and `.css` build files on every request.
+
+This has the exact same usage as [component-middleware](https://github.com/component/middleware.js).
+
+## License
+
+(The MIT License)
+
+Copyright (c) 2014 segmentio <team@segment.io>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

index.js

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+
+var Build = require('component-build');
+var Resolve = require('component-resolver');
+
+module.exports = function (build, options) {
+  if (typeof build === 'object') {
+    options = build;
+    build = Build;
+  } else if (typeof build !== 'function') {
+    build = Build;
+  }
+
+  options = options || {};
+  // always install instead of erroring!
+  options.install = true;
+  // add require() by default
+  if (options.require == null) options.require = true;
+
+  var root = options.root || process.cwd();
+  var resolving = false;
+  var queue = [];
+  var path = options.path || '/build';
+  var re = new RegExp('^' + path + '.(js|css)$');
+
+  return function* componentMiddleware(next) {
+    var m = re.exec(this.request.path);
+    if (!m) return yield* next;
+
+    var tree = yield resolve;
+    var _build = build(tree, options);
+
+    switch (m[1]) {
+      case 'js':
+        this.response.body = yield _build.scripts.bind(_build);
+        this.response.set('Cache-Control', 'private, no-cache');
+        this.response.type = 'js';
+        return;
+      case 'css':
+        this.response.body = yield _build.styles.bind(_build);
+        this.response.set('Cache-Control', 'private, no-cache');
+        this.response.type = 'css';
+        return;
+    }
+  }
+
+  // this is so you don't resolve two times at the same time.
+  // overoptimization, but hey.
+  function resolve(done) {
+    if (resolving) return queue.push(done);
+    resolving = true;
+
+    Resolve(root, options, function (err, tree) {
+      resolving = false;
+      while (queue.length) queue.shift()(err, tree);
+      done(err, tree);
+    });
+  }
+}

package.json

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+{
+  "name": "component-koa",
+  "description": "component building middleware for koa",
+  "version": "1.0.0",
+  "author": {
+    "name": "Jonathan Ong",
+    "email": "me@jongleberry.com",
+    "url": "http://jongleberry.com",
+    "twitter": "https://twitter.com/jongleberry"
+  },
+  "license": "MIT",
+  "repository": "component/koa.js",
+  "dependencies": {
+    "component-resolver": "^1.0.0",
+    "component-build": "^1.0.0"
+  },
+  "devDependencies": {
+    "koa": "*",
+    "mocha": "*",
+    "supertest": "*"
+  },
+  "scripts": {
+    "test": "mocha --harmony-generators --reporter spec --timeout 10s --bail test/index.js"
+  }
+}

test/client.js

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+module.exports = require('emitter');

test/component.json

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+{
+  "name": "test",
+  "dependencies": {
+    "necolas/normalize.css": "*",
+    "component/emitter": "*"
+  },
+  "scripts": ["client.js"]
+}

test/index.js

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+
+var request = require('supertest');
+var koa = require('koa');
+var vm = require('vm');
+
+var serve = require('..')({
+  root: __dirname
+});
+
+var server = koa().use(serve).listen();
+
+it('should serve js', function (done) {
+  request(server)
+  .get('/build.js')
+  .expect('content-type', 'application/javascript')
+  .expect(200, function (err, res) {
+    if (err) return err;
+
+    var js = res.text;
+    var ctx = vm.createContext();
+    vm.runInContext(js, ctx);
+    done();
+  })
+})
+
+it('should serve css', function (done) {
+  request(server)
+  .get('/build.css')
+  .expect('content-type', 'text/css; charset=utf-8')
+  .expect(200, done);
+})
+
+it('should 404 otherwise', function (done) {
+  request(server)
+  .get('/kljalskdjfasdf')
+  .expect(404, done);
+})