Automatic table of contents generation for Markdown

browser/lib/markdown-toc-generator.js

@@ -0,0 +1,100 @@
+/**
+ * @fileoverview Markdown table of contents generator
+ */
+
+import toc from 'markdown-toc'
+import diacritics from 'diacritics-map'
+import stripColor from 'strip-color'
+
+const EOL = require('os').EOL
+
+/**
+ * @caseSensitiveSlugify Custom slugify function
+ * Same implementation that the original used by markdown-toc (node_modules/markdown-toc/lib/utils.js),
+ * but keeps original case to properly handle https://github.com/BoostIO/Boostnote/issues/2067
+ */
+function caseSensitiveSlugify (str) {
+  function replaceDiacritics (str) {
+    return str.replace(/[À-ž]/g, function (ch) {
+      return diacritics[ch] || ch
+    })
+  }
+
+  function getTitle (str) {
+    if (/^\[[^\]]+\]\(/.test(str)) {
+      var m = /^\[([^\]]+)\]/.exec(str)
+      if (m) return m[1]
+    }
+    return str
+  }
+
+  str = getTitle(str)
+  str = stripColor(str)
+  // str = str.toLowerCase() //let's be case sensitive
+
+  // `.split()` is often (but not always) faster than `.replace()`
+  str = str.split(' ').join('-')
+  str = str.split(/\t/).join('--')
+  str = str.split(/<\/?[^>]+>/).join('')
+  str = str.split(/[|$&`~=\\\/@+*!?({[\]})<>=.,;:'"^]/).join('')
+  str = str.split(/[。？！，、；：“”【】（）〔〕［］﹃﹄“ ”‘’﹁﹂—…－～《》〈〉「」]/).join('')
+  str = replaceDiacritics(str)
+  return str
+}
+
+const TOC_MARKER_START = '<!-- toc -->'
+const TOC_MARKER_END = '<!-- tocstop -->'
+
+/**
+ * Takes care of proper updating given editor with TOC.
+ * If TOC doesn't exit in the editor, it's inserted at current caret position.
+ * Otherwise,TOC is updated in place.
+ * @param editor CodeMirror editor to be updated with TOC
+ */
+export function generateInEditor (editor) {
+  const tocRegex = new RegExp(`${TOC_MARKER_START}[\\s\\S]*?${TOC_MARKER_END}`)
+
+  function tocExistsInEditor () {
+    return tocRegex.test(editor.getValue())
+  }
+
+  function updateExistingToc () {
+    const toc = generate(editor.getValue())
+    const search = editor.getSearchCursor(tocRegex)
+    while (search.findNext()) {
+      search.replace(toc)
+    }
+  }
+
+  function addTocAtCursorPosition () {
+    const toc = generate(editor.getRange(editor.getCursor(), {line: Infinity}))
+    editor.replaceRange(wrapTocWithEol(toc, editor), editor.getCursor())
+  }
+
+  if (tocExistsInEditor()) {
+    updateExistingToc()
+  } else {
+    addTocAtCursorPosition()
+  }
+}
+
+/**
+ * Generates MD TOC based on MD document passed as string.
+ * @param markdownText MD document
+ * @returns generatedTOC String containing generated TOC
+ */
+export function generate (markdownText) {
+  const generatedToc = toc(markdownText, {slugify: caseSensitiveSlugify})
+  return TOC_MARKER_START + EOL + EOL + generatedToc.content + EOL + EOL + TOC_MARKER_END
+}
+
+function wrapTocWithEol (toc, editor) {
+  const leftWrap = editor.getCursor().ch === 0 ? '' : EOL
+  const rightWrap = editor.getLine(editor.getCursor().line).length === editor.getCursor().ch ? '' : EOL
+  return leftWrap + toc + rightWrap
+}
+
+export default {
+  generate,
+  generateInEditor
+}

browser/main/Detail/MarkdownNoteDetail.js

@@ -29,6 +29,7 @@ import { formatDate } from 'browser/lib/date-formatter'
 import { getTodoPercentageOfCompleted } from 'browser/lib/getTodoStatus'
 import striptags from 'striptags'
 import { confirmDeleteNote } from 'browser/lib/confirmDeleteNote'
+import markdownToc from 'browser/lib/markdown-toc-generator'
 
 class MarkdownNoteDetail extends React.Component {
   constructor (props) {
@@ -47,6 +48,7 @@ class MarkdownNoteDetail extends React.Component {
     this.dispatchTimer = null
 
     this.toggleLockButton = this.handleToggleLockButton.bind(this)
+    this.generateToc = () => this.handleGenerateToc()
   }
 
   focus () {
@@ -59,6 +61,7 @@ class MarkdownNoteDetail extends React.Component {
       const reversedType = this.state.editorType === 'SPLIT' ? 'EDITOR_PREVIEW' : 'SPLIT'
       this.handleSwitchMode(reversedType)
     })
+    ee.on('code:generate-toc', this.generateToc)
   }
 
   componentWillReceiveProps (nextProps) {
@@ -75,6 +78,7 @@ class MarkdownNoteDetail extends React.Component {
 
   componentWillUnmount () {
     ee.off('topbar:togglelockbutton', this.toggleLockButton)
+    ee.off('code:generate-toc', this.generateToc)
     if (this.saveQueue != null) this.saveNow()
   }
 
@@ -262,6 +266,11 @@ class MarkdownNoteDetail extends React.Component {
     }
   }
 
+  handleGenerateToc () {
+    const editor = this.refs.content.refs.code.editor
+    markdownToc.generateInEditor(editor)
+  }
+
   handleFocus (e) {
     this.focus()
   }

browser/main/Detail/SnippetNoteDetail.js

@@ -29,6 +29,7 @@ import InfoPanelTrashed from './InfoPanelTrashed'
 import { formatDate } from 'browser/lib/date-formatter'
 import i18n from 'browser/lib/i18n'
 import { confirmDeleteNote } from 'browser/lib/confirmDeleteNote'
+import markdownToc from 'browser/lib/markdown-toc-generator'
 
 const electron = require('electron')
 const { remote } = electron
@@ -52,6 +53,7 @@ class SnippetNoteDetail extends React.Component {
     }
 
     this.scrollToNextTabThreshold = 0.7
+    this.generateToc = () => this.handleGenerateToc()
   }
 
   componentDidMount () {
@@ -65,6 +67,7 @@ class SnippetNoteDetail extends React.Component {
         enableLeftArrow: allTabs.offsetLeft !== 0
       })
     }
+    ee.on('code:generate-toc', this.generateToc)
   }
 
   componentWillReceiveProps (nextProps) {
@@ -91,6 +94,15 @@ class SnippetNoteDetail extends React.Component {
 
   componentWillUnmount () {
     if (this.saveQueue != null) this.saveNow()
+    ee.off('code:generate-toc', this.generateToc)
+  }
+
+  handleGenerateToc () {
+    const currentMode = this.state.note.snippets[this.state.snippetIndex].mode
+    if (currentMode.includes('Markdown')) {
+      const currentEditor = this.refs['code-' + this.state.snippetIndex].refs.code.editor
+      markdownToc.generateInEditor(currentEditor)
+    }
   }
 
   handleChange (e) {
@@ -441,7 +453,7 @@ class SnippetNoteDetail extends React.Component {
           const isSuper = global.process.platform === 'darwin'
             ? e.metaKey
             : e.ctrlKey
-          if (isSuper && !e.shiftKey) {
+          if (isSuper && !e.shiftKey && !e.altKey) {
             e.preventDefault()
             this.addSnippet()
           }

lib/main-menu.js

@@ -145,6 +145,16 @@ const file = {
     {
       type: 'separator'
     },
+    {
+      label: 'Generate/Update Markdown TOC',
+      accelerator: 'Shift+Ctrl+T',
+      click () {
+        mainWindow.webContents.send('code:generate-toc')
+      }
+    },
+    {
+      type: 'separator'
+    },
     {
       label: 'Print',
       accelerator: 'CommandOrControl+P',

package.json

@@ -82,6 +82,7 @@
     "markdown-it-named-headers": "^0.0.4",
     "markdown-it-plantuml": "^1.1.0",
     "markdown-it-smartarrows": "^1.0.1",
+    "markdown-toc": "^1.2.0",
     "mdurl": "^1.0.1",
     "mermaid": "^8.0.0-rc.8",
     "moment": "^2.10.3",

tests/helpers/setup-browser-env.js

@@ -1,5 +1,23 @@
 import browserEnv from 'browser-env'
-browserEnv(['window', 'document'])
+browserEnv(['window', 'document', 'navigator'])
+
+// for CodeMirror mockup
+document.body.createTextRange = function () {
+  return {
+    setEnd: function () {},
+    setStart: function () {},
+    getBoundingClientRect: function () {
+      return {right: 0}
+    },
+    getClientRects: function () {
+      return {
+        length: 0,
+        left: 0,
+        right: 0
+      }
+    }
+  }
+}
 
 window.localStorage = {
   // polyfill