From 4ccda54a350ee2ce1e4bf1e6c2839aed84418715 Mon Sep 17 00:00:00 2001
From: Alexej Yaroshevich <alex@qfox.ru>
Date: Sat, 14 Feb 2015 23:31:29 +0400
Subject: [PATCH] runner: allow to pass grep via options or env

Fixes #61
Closes gh-62
---
 lib/plugin.js |  5 ++++-
 lib/runner.js | 16 +++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/lib/plugin.js b/lib/plugin.js
index c59ab5e..0110eee 100644
--- a/lib/plugin.js
+++ b/lib/plugin.js
@@ -83,7 +83,10 @@ module.exports = function (helper) {
                 referenceDirSuffixes: options.referenceDirSuffixes || ['tmpl-specs'],
                 saveHtml: (typeof process.env.BEM_TMPL_SPECS_SAVE_HTML === 'undefined' ?
                     options.saveHtml :
-                    process.env.BEM_TMPL_SPECS_SAVE_HTML) || false
+                    process.env.BEM_TMPL_SPECS_SAVE_HTML) || false,
+                grep: (typeof process.env.BEM_TMPL_SPECS_GREP === 'undefined' ?
+                    options.grep :
+                    process.env.BEM_TMPL_SPECS_GREP) || false
             };
         },
 
diff --git a/lib/runner.js b/lib/runner.js
index 261450b..27d2e49 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -10,7 +10,8 @@ exports.run = function (files, opts) {
     var defer = vow.defer(),
         mocha = new Mocha({
             ui: 'bdd',
-            reporter: runReporters
+            reporter: runReporters,
+            grep: parseRe(opts.grep)
         });
 
     mocha.files = files;
@@ -96,3 +97,16 @@ function saveCoverageReport(coverage, opts) {
     });
     return defer.promise();
 }
+
+var regexpRe = /^\/(.+)\/(i?)$/;
+function parseRe(str) {
+    if (typeof str !== 'string') {
+        return str;
+    }
+
+    var m = regexpRe.exec(str);
+    if (!m) {
+        return str;
+    }
+    return new RegExp(m[1], m[2]);
+}