From da9ff90d3e1b1348c43cd378c0806e159a700810 Mon Sep 17 00:00:00 2001
From: Alan Pearce
Date: Sun, 18 Jun 2017 12:24:24 +0200
Subject: feat: Parse front matter as metadata

---
 src/index.js            |  7 ++++++-
 src/modules/metadata.js | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 src/views/index.html    |  4 ++++
 3 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 src/modules/metadata.js

(limited to 'src')

diff --git a/src/index.js b/src/index.js
index 630ac08..c16d952 100644
--- a/src/index.js
+++ b/src/index.js
@@ -10,10 +10,15 @@ const router = new Router()
 
 const view = require('koa-nunjucks-next')
 
+const metadata = require('./modules/metadata.js')
+const postMetadata = metadata.getFolderMetadata(process.env.POST_DIR)
+
 app.use(view(`${__dirname}/views`))
 
 router.get('/', async function (ctx, next) {
-  await ctx.render('index')
+  await ctx.render('index', {
+    posts: postMetadata
+  })
 })
 
 app.use(router.routes()).use(router.allowedMethods())
diff --git a/src/modules/metadata.js b/src/modules/metadata.js
new file mode 100644
index 0000000..9f24d8e
--- /dev/null
+++ b/src/modules/metadata.js
@@ -0,0 +1,46 @@
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const matter = require('gray-matter')
+
+const options = {
+  lang: 'toml',
+  delims: '+++'
+}
+
+function* lowercaseKeys (iterator) {
+  for (let [k, v] of iterator) {
+    yield [String(k).toLowerCase(), v]
+  }
+}
+
+function canonicaliseMetadata (meta) {
+  if (meta.data) {
+    meta.data = new Map(lowercaseKeys(Object.entries(meta.data)))
+  } else {
+    meta.data = new Map()
+  }
+  return meta
+}
+
+function readFileMetadata (filename) {
+  return canonicaliseMetadata(matter.read(filename, options))
+}
+
+function getFileMetadata (filename) {
+  const result = readFileMetadata(filename)
+  return result && result.data
+}
+
+function getFolderMetadata (folder) {
+  return fs
+    .readdirSync(folder)
+    .map(f => path.resolve(folder, f))
+    .map(readFileMetadata)
+}
+
+module.exports = {
+  getFileMetadata,
+  getFolderMetadata
+}
diff --git a/src/views/index.html b/src/views/index.html
index 3b18e51..0e900e6 100644
--- a/src/views/index.html
+++ b/src/views/index.html
@@ -1 +1,5 @@
 hello world
+
+{% for post in posts %}
+  {{ post.data.get('title') }}
+{% endfor %}
-- 
cgit 1.4.1