Add cpplint plugin.

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

company.js

@@ -1,6 +1,9 @@
 var Plugin = require('../plugin');
 
-// config: None
+// [prerequisite]
+//
+// [config]
+//
 var plugin = new Plugin(100, 'company', '2017.07.25',
     'Plugin to query by company for free user.');
 

cpplint.js

@@ -0,0 +1,56 @@
+var cp = require('child_process');
+
+var log = require('../log');
+var Plugin = require('../plugin');
+
+// [prerequisite]
+//
+// Need install cpplint:
+//   https://raw.githubusercontent.com/google/styleguide/gh-pages/cpplint/cpplint.py
+//
+// [config]
+//
+// You can disable/enable some checks in "flags" section.
+//
+// "PLUGINS": {
+//   "cpplint": {
+//     "bin": "<path of cpplint script>",
+//     "flags": [
+//       "-whitespace/indent",
+//       <other flags>
+//     ]
+//   }
+// }
+var plugin = new Plugin(100, 'cpplint', '2017.07.25',
+    'Plugin to do static code check on c++ code.');
+
+var DEFAULT_FLAGS = [
+  '-legal/copyright',
+  '-build/include_what_you_use'
+];
+
+plugin.testProblem = function(problem, cb) {
+  var flags = DEFAULT_FLAGS.concat(plugin.config.flags || []);
+
+  var cmd = [
+    plugin.config.bin,
+    '--filter=' + flags.join(','),
+    problem.file
+  ].join(' ');
+
+  log.info('\nRunning cpplint ...');
+  log.debug(cmd);
+  log.info();
+
+  cp.exec(cmd, function(e, stdout, stderr) {
+    if (e) {
+      stderr.split('\n').forEach(function(line) {
+        if (line.length > 0) log.error(line);
+      });
+    } else {
+      plugin.next.testProblem(problem, cb);
+    }
+  });
+};
+
+module.exports = plugin;