use git to manage esjs and k4d3 deps.

.bowerrc

@@ -1,3 +1,6 @@
 {
-  "directory": "./src/bower_components"
+  "directory": "./src/bower_components",
+  "scripts": {
+    "postinstall": "grunt update"
+  }
 }

Gruntfile.js

@@ -10,6 +10,13 @@ module.exports = function (grunt) {
       app: __dirname + '/src/kibana',
       unitTestDir: __dirname + '/test/unit',
       testUtilsDir: __dirname + '/test/utils',
+      bowerComponentsDir: __dirname + '/src/bower_components',
+
+      k4d3Repo: 'git@github.com:elasticsearch/K4D3.git',
+      k4d3Dir: '<%= bowerComponentsDir %>/K4D3',
+      esjsRepo: 'git@github.com:elasticsearch/elasticsearch-js.git',
+      esjsDir: '<%= bowerComponentsDir %>/elasticsearch',
+
       meta: {
         banner: '/*! <%= package.name %> - v<%= package.version %> - ' +
           '<%= grunt.template.today("yyyy-mm-dd") %>\n' +

package.json

@@ -23,8 +23,7 @@
   "scripts": {
     "test": "grunt test",
     "server": "grunt server",
-    "update": "bower update elasticsearch && bower update K4D3 && npm run rebuild-esjs",
-    "rebuild-esjs": "cd ./src/bower_components/elasticsearch && npm install && grunt browser_clients:build"
+    "postinstall": "grunt update"
   },
   "repository": {
     "type": "git",

tasks/update.js

@@ -0,0 +1,28 @@
+module.exports = function (grunt) {
+  var Promise = require('bluebird');
+  var spawn = require('./utils/spawn');
+  var installOrUpdateRepo = require('./utils/install_or_update_repo');
+
+  // bower update elasticsearch && bower update K4D3 && npm run rebuild-esjs"
+  grunt.registerTask('update', [
+    'update-esjs',
+    'update-k4d3'
+  ]);
+
+  grunt.registerTask('update-k4d3', function () {
+    var k4d3Dir = grunt.config('k4d3Dir');
+
+    installOrUpdateRepo(grunt.config('k4d3Repo'), k4d3Dir)
+      .then(spawn('grunt', ['production'], k4d3Dir))
+      .nodeify(this.async());
+  });
+
+  // cd ./src/bower_components/elasticsearch && npm install && grunt browser_clients:build
+  grunt.registerTask('update-esjs', function () {
+    var esjsDir = grunt.config('esjsDir');
+
+    installOrUpdateRepo(grunt.config('esjsRepo'), esjsDir)
+      .then(spawn('grunt', ['browser_clients:build'], esjsDir))
+      .nodeify(this.async());
+  });
+};

tasks/utils/install_or_update_repo.js

@@ -0,0 +1,20 @@
+var Promise = require('bluebird');
+var spawn = require('./spawn');
+var grunt = require('grunt');
+
+module.exports = function (repo, dir) {
+  return Promise.resolve()
+  .then(function () {
+    if (!grunt.file.isDir(dir + '/.git')) {
+      if (grunt.file.isDir(dir)) {
+        throw new Error(dir + ' needs to be removed so that we can replace it with a git-repo');
+      }
+
+      return spawn('git', ['clone', repo, dir])();
+    } else {
+      return spawn('git', ['fetch', 'origin', 'master'], dir)();
+    }
+  })
+  .then(spawn('git', ['reset', '--hard', 'origin/master'], dir))
+  .then(spawn('npm', ['install'], dir));
+};

tasks/utils/spawn.js

@@ -0,0 +1,45 @@
+var Promise = require('bluebird');
+var grunt = require('grunt');
+var estream = require('event-stream');
+var cp = require('child_process');
+
+// create a function that will spawn another process based on the args when called
+module.exports = function (cmd, args, cwd) {
+  return function () {
+    var defer = Promise.defer();
+    var opts = {
+      stdio: 'pipe',
+      cwd: cwd
+    };
+
+    var endsWithNlRE = /\n\r?$/;
+
+    grunt.log.writeln('$ ' + cmd + ' ' + args.join(' ') + (opts.cwd ? ' in ' + opts.cwd : ''));
+    var childProc = cp.spawn(cmd, args, opts);
+
+    // track when we are in a series of empty lines, and use this info to limit empty lines to one
+    var empty = 0;
+    var maxEmpty = 1;
+
+    ['stdout', 'stderr'].forEach(function (stream) {
+      childProc[stream]
+        .pipe(estream.split())
+        .pipe(
+          estream.map(function (line, cb) {
+            if (!line) { empty ++; if (empty > maxEmpty) return; }
+            else empty = 0;
+
+            cb(null, '  ' + line + '\n');
+          })
+        )
+        .pipe(process[stream]);
+    });
+
+    childProc.on('close', function (code) {
+      if (code > 0) defer.reject('Process exitted with non-zero code ' + code);
+      else defer.resolve();
+    });
+
+    return defer.promise;
+  };
+};