feat(gulp): add gulp example

Author: azu

package.json

@@ -62,6 +62,8 @@
   "dependencies": {
     "esprima": "^2.5.0",
     "estraverse": "^4.1.0",
+    "gulp": "^3.9.0",
+    "gulp-util": "^3.0.6",
     "jquery": "^2.1.4"
   }
 }

src/gulp/gulpfile.babel.js

@@ -0,0 +1,33 @@
+// LICENSE : MIT
+"use strict";
+import gulp from "gulp";
+import {Transform} from "stream";
+let transformStream = new Transform({
+    writableObjectMode: true,
+    readableObjectMode: true,
+    transform: function (chunk, encoding, next) {
+        let str = Buffer.concat([Buffer("prefix"), chunk]);
+        this.push(str);
+        next();
+    }
+});
+
+let gulpTransform = new Transform({
+    writableObjectMode: true,
+    readableObjectMode: true,
+    transform: function (file, encoding, next) {
+        if (file.isStream()) {
+            file.contents = file.contents.pipe(transformStream);
+        }
+        this.push(file);
+        next();
+    }
+});
+gulp.task("default", function () {
+    return gulp.src("./*.js", {buffer: false})
+        .pipe(gulpTransform)
+        .pipe(gulp.dest("modified-files"))
+        .on("error", (error) => {
+            console.error(error);
+        });
+});

test/prh-rule.yaml

@@ -67,6 +67,7 @@ rules:
     specs:
       - from: connect
         to:   Connect
+  - expected: gulp
 
   - expected: プラグインアーキテクチャ
     pattern: