add support to front-matter

browser/lib/findNoteTitle.js

@@ -3,6 +3,17 @@ export function findNoteTitle (value) {
   let title = null
   let isInsideCodeBlock = false
 
+  if (splitted[0] === '---') {
+    let line = 0
+    while (++line < splitted.length) {
+      if (splitted[line] === '---') {
+        splitted.splice(0, line + 1)
+
+        break
+      }
+    }
+  }
+
   splitted.some((line, index) => {
     const trimmedLine = line.trim()
     const trimmedNextLine = splitted[index + 1] === undefined ? '' : splitted[index + 1].trim()

browser/lib/markdown-it-frontmatter.js

@@ -0,0 +1,24 @@
+'use strict'
+
+module.exports = function frontMatterPlugin (md) {
+  function frontmatter (state, startLine, endLine, silent) {
+    if (startLine !== 0 || state.src.substr(startLine, state.eMarks[0]) !== '---') {
+      return false
+    }
+
+    let line = 0
+    while (++line < state.lineMax) {
+      if (state.src.substring(state.bMarks[line], state.eMarks[line]) === '---') {
+        state.line = line + 1
+
+        return true
+      }
+    }
+
+    return false
+  }
+
+  md.block.ruler.before('table', 'frontmatter', frontmatter, {
+    alt: [ 'paragraph', 'reference', 'blockquote', 'list' ]
+  })
+}

browser/lib/markdown.js

@@ -149,6 +149,7 @@ class Markdown {
     })
     this.md.use(require('markdown-it-kbd'))
     this.md.use(require('markdown-it-admonition'))
+    this.md.use(require('./markdown-it-frontmatter'))
 
     const deflate = require('markdown-it-plantuml/lib/deflate')
     this.md.use(require('markdown-it-plantuml'), '', {

tests/lib/find-title-test.js

@@ -14,7 +14,8 @@ test('findNoteTitle#find  should return a correct title (string)', t => {
     ['hoge\n====\nfuga', 'hoge'],
     ['====', '===='],
     ['```\n# hoge\n```', '```'],
-    ['hoge', 'hoge']
+    ['hoge', 'hoge'],
+    ['---\nlayout: test\n---\n # hoge', '# hoge']
   ]
 
   testCases.forEach(testCase => {