Add new Grunt build

tasks/examples.js

@@ -0,0 +1,49 @@
+var path = require('path');
+var _ = require('lodash');
+
+function pathToArray(parts) {
+  var part = parts.shift();
+  if (parts.length > 0) {
+    var obj = {};
+    obj[part] = pathToArray(parts);
+    return obj;
+  } else {
+    return part;
+  }
+}
+
+module.exports = function(grunt) {
+  grunt.registerMultiTask('examples', 'Build examples site.', function() {
+    var options = this.options({
+      base: '',
+      excludes: []
+    });
+
+    this.files.forEach(function(f) {
+      var results = {};
+      f.src.filter(function(filepath) {
+        if (!grunt.file.exists(filepath)) {
+          grunt.log.warn('Source file "' + filepath + '" not found.');
+          return false;
+        } else {
+          filepath = path.relative(options.base, filepath);
+          return options.excludes.every(function(dir) {
+            return filepath.indexOf(dir + '/') < 0;
+          });
+        }
+      }).map(function(filepath) {
+        return pathToArray(path.relative(options.base, filepath).split('/'));
+      }).forEach(function(parts) {
+        _.merge(results, parts, function(a, b) {
+          var example = {
+            file: encodeURIComponent(b).replace(/%20/g, '+'),
+            title: b.substr(0, b.length - 3)
+          };
+          return _.isArray(a) ? a.concat(example) : [example];
+        });
+      });
+
+      grunt.file.write(f.dest, JSON.stringify(results, null, '  '));
+    });
+  });
+};