spawn handlebars meta patterns if not found

part of pattern-lab/patternlab-node#611
pattern-lab · May 16, 2017 · 3dd846b · 3dd846b
1 parent 6bfb650
commit 3dd846b
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Showing 4 changed files with 54 additions and 3 deletions.
diff --git a/_meta/_00-head.hbs b/_meta/_00-head.hbs
@@ -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 }}}
+    <!-- End Pattern Lab -->
+
+  </head>
+  <body class="{{ bodyClass }}">
diff --git a/_meta/_01-foot.hbs b/_meta/_01-foot.hbs
@@ -0,0 +1,6 @@
+
+<!--DO NOT REMOVE-->
+{{{ patternLabFoot }}}
+
+</body>
+</html>
diff --git a/lib/engine_handlebars.js b/lib/engine_handlebars.js
@@ -1,3 +1,5 @@
+"use strict";
+
 /*
  * handlebars pattern engine for patternlab-node - v0.15.1 - 2015
  *
@@ -20,9 +22,9 @@
  *
  */
 
-"use strict";
-
-var Handlebars = require('handlebars');
+const fs = require('fs-extra');
+const path = require('path');
+const Handlebars = require('handlebars');
 
 // regexes, stored here so they're only compiled once
 const findPartialsRE = /{{#?>\s*([\w-\/.]+)(?:.|\s+)*?}}/g;
@@ -92,6 +94,32 @@ var engine_handlebars = {
   findPartial: function (partialString) {
     var partial = partialString.replace(findPartialsRE, '$1');
     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 localMetaFilePath = path.resolve(__dirname, '_meta/', fileName);
+      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.hbs');
+    this.spawnFile(config, '_01-foot.hbs');
   }
 };
 

diff --git a/package.json b/package.json
@@ -4,6 +4,7 @@
   "version": "1.0.2",
   "main": "lib/engine_handlebars.js",
   "dependencies": {
+    "fs-extra": "^0.30.0",
     "handlebars": "^4.0.5"
   },
   "devDependencies": {},