spawn twig meta files if not found

bmuenzenmeyer · geoffp · commit b44ec0b8993f · 2018-02-23T14:26:08.000-06:00
part of #611
diff --git a/packages/patternengine-node-twig/_meta/_00-head.twig b/packages/patternengine-node-twig/_meta/_00-head.twig
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html class="{{ htmlClass }}">
+  <head>
+    <title>{{ title }}</title>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width" />
+
+    <link rel="stylesheet" href="../../css/style.css?{{ cacheBuster }}" media="all" />
+    <link rel="stylesheet" href="../../css/pattern-scaffolding.css?{{ cacheBuster }}" media="all" />
+
+    <!-- Begin Pattern Lab (Required for Pattern Lab to run properly) -->
+    {{ patternLabHead | raw }}
+    <!-- End Pattern Lab -->
+
+  </head>
+  <body class="{{ bodyClass }}">
diff --git a/packages/patternengine-node-twig/_meta/_01-foot.twig b/packages/patternengine-node-twig/_meta/_01-foot.twig
@@ -0,0 +1,6 @@
+
+<!--DO NOT REMOVE-->
+{{ patternLabFoot | raw }}
+
+</body>
+</html>
diff --git a/packages/patternengine-node-twig/lib/engine_twig.js b/packages/patternengine-node-twig/lib/engine_twig.js
@@ -1,3 +1,5 @@
+"use strict";
+
 /*
  * twig pattern engine for patternlab-node - v0.15.1 - 2015
  *
@@ -18,10 +20,10 @@
  *
  */
 
-"use strict";
-
-var Twig = require('twig');
-var twig = Twig.twig;
+const fs = require('fs-extra');
+const path = require('path');
+const Twig = require('twig');
+const twig = Twig.twig;
 
 var engine_twig = {
   engine: Twig,
@@ -76,7 +78,33 @@ var engine_twig = {
     partial = partial.replace(/"/g, '');
 
     return partial;
+  },
+
+  spawnFile: function (config, fileName) {
+    const paths = config.paths;
+    const metaFilePath = path.resolve(paths.source.meta, fileName);
+    try {
+      fs.statSync(metaFilePath);
+    } catch (err) {
+
+      //not a file, so spawn it from the included file
+      const metaFileContent = fs.readFileSync(path.resolve(__dirname, '..', '_meta/', fileName), 'utf8');
+      fs.outputFileSync(metaFilePath, metaFileContent);
+    }
+  },
+
+  /**
+  * Checks to see if the _meta directory has engine-specific head and foot files,
+  * spawning them if not found.
+  *
+  * @param {object} config - the global config object from core, since we won't
+  * assume it's already present
+  */
+  spawnMeta: function (config) {
+    this.spawnFile(config, '_00-head.twig');
+    this.spawnFile(config, '_01-foot.twig');
   }
+
 };
 
 module.exports = engine_twig;
diff --git a/packages/patternengine-node-twig/package.json b/packages/patternengine-node-twig/package.json
@@ -4,6 +4,7 @@
   "version": "0.1.0",
   "main": "lib/engine_twig.js",
   "dependencies": {
+    "fs-extra": "^0.30.0",
     "twig": "^0.9.5"
   },
   "devDependencies": {},
