Add gfm plugins

README.md

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+# turndown-plugin-gfm
+
+A [Turndown](https://github.com/domchristie/turndown) plugin which adds GitHub Flavored Markdown extensions.
+
+## Installation
+
+npm:
+
+```
+npm install turndown-plugin-gfm
+```
+
+Browser:
+
+```html
+<script src="https://unpkg.com/turndown/dist/turndown.js"></script>
+<script src="https://unpkg.com/turndown/dist/turndown-plugin-gfm.js"></script>
+```
+
+## Usage
+
+```js
+// For Node.js
+var TurndownService = require('turndown')
+var turndownPluginGfm = require('turndown-plugin-gfm')
+
+var gfm = turndownPluginGfm.gfm
+var turndownService = new TurndownService()
+turndownService.use(gfm)
+var markdown = turndownService.turndown('<strike>Hello world!</strike>')
+```
+
+turndown-plugin-gfm is a suite of plugins which can be applied individually. The available plugins are as follows:
+
+- `strikethrough` (for converting `<strike>`, `<s>`, and `<del>` elements)
+- `tables`
+- `taskListItems`
+- `gfm` (which applies all of the above)
+
+So for example, if you only wish to convert tables:
+
+```js
+var tables = require('turndown-plugin-gfm').tables
+var turndownService = new TurndownService()
+turndownService.use(tables)
+```
+
+## License
+
+turndown-plugin-gfm is copyright © 2017+ Dom Christie and released under the MIT license.

config/rollup.config.browser.cjs.js

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+import config from './rollup.config'
+
+export default config({
+  output: {
+    format: 'cjs',
+    file: 'lib/turndown-plugin-gfm.browser.cjs.js'
+  }
+})

config/rollup.config.browser.es.js

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+import config from './rollup.config'
+
+export default config({
+  output: {
+    format: 'es',
+    file: 'lib/turndown-plugin-gfm.browser.es.js'
+  }
+})

config/rollup.config.cjs.js

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+import config from './rollup.config'
+
+export default config({
+  output: {
+    format: 'cjs',
+    file: 'lib/turndown-plugin-gfm.cjs.js'
+  }
+})

config/rollup.config.es.js

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+import config from './rollup.config'
+
+export default config({
+  output: {
+    format: 'es',
+    file: 'lib/turndown-plugin-gfm.es.js'
+  }
+})

config/rollup.config.iife.js

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+import config from './rollup.config'
+
+export default config({
+  output: {
+    format: 'iife',
+    file: 'dist/turndown-plugin-gfm.js'
+  }
+})

config/rollup.config.js

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+export default function (config) {
+  return {
+    name: 'turndownPluginGfm',
+    input: 'src/gfm.js',
+    output: config.output
+  }
+}

package.json

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+{
+  "name": "turndown-plugin-gfm",
+  "description": "Turndown plugin to add GitHub Flavored Markdown extensions.",
+  "version": "0.0.1",
+  "author": "Dom Christie",
+  "devDependencies": {
+    "browserify": "^14.5.0",
+    "rollup": "^0.50.0",
+    "standard": "^10.0.3",
+    "turndown": "0.0.8",
+    "turndown-attendant": "0.0.2"
+  },
+  "files": [
+    "lib",
+    "dist"
+  ],
+  "jsnext:main": "lib/turndown-plugin-gfm.es.js",
+  "keywords": [
+    "turndown",
+    "turndown-plugin",
+    "html-to-markdown",
+    "html",
+    "markdown",
+    "github-flavored-markdown",
+    "gfm"
+  ],
+  "license": "MIT",
+  "main": "lib/turndown-plugin-gfm.cjs.js",
+  "module": "lib/turndown-plugin-gfm.es.js",
+  "scripts": {
+    "build": "npm run build-cjs && npm run build-es && npm run build-iife",
+    "build-cjs": "rollup -c config/rollup.config.cjs.js && rollup -c config/rollup.config.browser.cjs.js",
+    "build-es": "rollup -c config/rollup.config.es.js && rollup -c config/rollup.config.browser.es.js",
+    "build-iife": "rollup -c config/rollup.config.iife.js",
+    "build-test": "browserify test/turndown-plugin-gfm-test.js --outfile test/turndown-plugin-gfm-test.browser.js",
+    "prepublish": "npm run build",
+    "test": "npm run build && standard ./src/**/*.js && node test/turndown-plugin-gfm-test.js"
+  }
+}

src/gfm.js

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+import strikethrough from './strikethrough'
+import tables from './tables'
+import taskListItems from './task-list-items'
+
+function gfm (turndownService) {
+  turndownService.use([strikethrough, tables, taskListItems])
+}
+
+export { gfm, strikethrough, tables, taskListItems }

src/strikethrough.js

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+export default function strikethrough (turndownService) {
+  turndownService.addRule('strikethrough', {
+    filter: ['del', 's', 'strike'],
+    replacement: function (content) {
+      return '~' + content + '~'
+    }
+  })
+}

src/tables.js

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+var rules = {}
+
+rules.tableCell = {
+  filter: ['th', 'td'],
+  replacement: function (content, node) {
+    return cell(content, node)
+  }
+}
+
+rules.tableRow = {
+  filter: 'tr',
+  replacement: function (content, node) {
+    var borderCells = ''
+    var alignMap = { left: ':--', right: '--:', center: ':-:' }
+
+    if (node.parentNode.nodeName === 'THEAD') {
+      for (var i = 0; i < node.childNodes.length; i++) {
+        var align = node.childNodes[i].attributes.align
+        var border = '---'
+
+        if (align) border = alignMap[align.value] || border
+
+        borderCells += cell(border, node.childNodes[i])
+      }
+    }
+    return '\n' + content + (borderCells ? '\n' + borderCells : '')
+  }
+}
+
+rules.table = {
+  filter: 'table',
+  replacement: function (content) {
+    // Ensure there are no blank lines
+    content = content.replace('\n\n', '\n')
+    return '\n\n' + content + '\n\n'
+  }
+}
+
+rules.tableSection = {
+  filter: ['thead', 'tbody', 'tfoot'],
+  replacement: function (content) {
+    return content
+  }
+}
+
+function cell (content, node) {
+  var index = Array.prototype.indexOf.call(node.parentNode.childNodes, node)
+  var prefix = ' '
+  if (index === 0) prefix = '| '
+  return prefix + content + ' |'
+}
+
+export default function tables (turndownService) {
+  for (var key in rules) turndownService.addRule(key, rules[key])
+}

src/task-list-items.js

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+export default function taskListItems (turndownService) {
+  turndownService.addRule('taskListItems', {
+    filter: function (node) {
+      return node.type === 'checkbox' && node.parentNode.nodeName === 'LI'
+    },
+    replacement: function (content, node) {
+      return (node.checked ? '[x]' : '[ ]') + ' '
+    }
+  })
+}

test/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>turndown test runner</title>
+  <link rel="stylesheet" href="../node_modules/turndown-attendant/dist/styles.css">
+</head>
+<body>
+
+<!-- TEST CASES -->
+
+<div class="case" data-name="strike">
+  <div class="input"><strike>Lorem ipsum</strike></div>
+  <pre class="expected">~Lorem ipsum~</pre>
+</div>
+
+<div class="case" data-name="s">
+  <div class="input"><s>Lorem ipsum</s></div>
+  <pre class="expected">~Lorem ipsum~</pre>
+</div>
+
+<div class="case" data-name="del">
+  <div class="input"><del>Lorem ipsum</del></div>
+  <pre class="expected">~Lorem ipsum~</pre>
+</div>
+
+<div class="case" data-name="unchecked inputs">
+  <div class="input"><ul><li><input type=checkbox>Check Me!</li></ul></div>
+  <pre class="expected">*   [ ] Check Me!</pre>
+</div>
+
+<div class="case" data-name="checked inputs">
+  <div class="input"><ul><li><input type=checkbox checked>Checked!</li></ul></div>
+  <pre class="expected">*   [x] Checked!</pre>
+</div>
+
+<div class="case" data-name="basic table">
+  <div class="input">
+    <table>
+      <thead>
+        <tr>
+          <th>Column 1</th>
+          <th>Column 2</th>
+        </tr>
+      </thead>
+      <tbody>
+        <tr>
+          <td>Row 1, Column 1</td>
+          <td>Row 1, Column 2</td>
+        </tr>
+        <tr>
+          <td>Row 2, Column 1</td>
+          <td>Row 2, Column 2</td>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+  <pre class="expected">| Column 1 | Column 2 |
+| --- | --- |
+| Row 1, Column 1 | Row 1, Column 2 |
+| Row 2, Column 1 | Row 2, Column 2 |</pre>
+</div>
+
+<div class="case" data-name="cell alignment">
+  <div class="input">
+    <table>
+      <thead>
+        <tr>
+          <th align="left">Column 1</th>
+          <th align="center">Column 2</th>
+          <th align="right">Column 3</th>
+          <th align="foo">Column 4</th>
+        </tr>
+      </thead>
+      <tbody>
+        <tr>
+          <td>Row 1, Column 1</td>
+          <td>Row 1, Column 2</td>
+          <td>Row 1, Column 3</td>
+          <td>Row 1, Column 4</td>
+        </tr>
+        <tr>
+          <td>Row 2, Column 1</td>
+          <td>Row 2, Column 2</td>
+          <td>Row 2, Column 3</td>
+          <td>Row 2, Column 4</td>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+  <pre class="expected">| Column 1 | Column 2 | Column 3 | Column 4 |
+| :-- | :-: | --: | --- |
+| Row 1, Column 1 | Row 1, Column 2 | Row 1, Column 3 | Row 1, Column 4 |
+| Row 2, Column 1 | Row 2, Column 2 | Row 2, Column 3 | Row 2, Column 4 |</pre>
+</div>
+
+<div class="case" data-name="empty cells">
+  <div class="input">
+    <table>
+      <thead>
+        <tr>
+          <th align="left">Column 1</th>
+          <th align="center">Column 2</th>
+          <th align="right">Column 3</th>
+          <th align="foo">Column 4</th>
+        </tr>
+      </thead>
+      <tbody>
+        <tr>
+          <td></td>
+          <td>Row 1, Column 2</td>
+          <td>Row 1, Column 3</td>
+          <td>Row 1, Column 4</td>
+        </tr>
+        <tr>
+          <td>Row 2, Column 1</td>
+          <td></td>
+          <td>Row 2, Column 3</td>
+          <td>Row 2, Column 4</td>
+        </tr>
+        <tr>
+          <td>Row 3, Column 1</td>
+          <td>Row 3, Column 2</td>
+          <td></td>
+          <td>Row 3, Column 4</td>
+        </tr>
+        <tr>
+          <td>Row 4, Column 1</td>
+          <td>Row 4, Column 2</td>
+          <td>Row 4, Column 3</td>
+          <td></td>
+        </tr>
+        <tr>
+          <td></td>
+          <td></td>
+          <td></td>
+          <td>Row 5, Column 4</td>
+        </tr>
+      </tbody>
+    </table>
+</div>
+<pre class="expected">| Column 1 | Column 2 | Column 3 | Column 4 |
+| :-- | :-: | --: | --- |
+|  | Row 1, Column 2 | Row 1, Column 3 | Row 1, Column 4 |
+| Row 2, Column 1 |  | Row 2, Column 3 | Row 2, Column 4 |
+| Row 3, Column 1 | Row 3, Column 2 |  | Row 3, Column 4 |
+| Row 4, Column 1 | Row 4, Column 2 | Row 4, Column 3 |  |
+|  |  |  | Row 5, Column 4 |</pre>
+</div>
+
+<div class="case" data-name="empty rows">
+  <div class="input">
+    <table>
+      <tbody>
+        <tr>
+          <td>Row 1</td>
+          <td>Row 1</td>
+        </tr>
+        <tr>
+          <td></td>
+          <td></td>
+        </tr>
+        <tr>
+          <td>Row 3</td>
+          <td>Row 3</td>
+        </tr>
+      </tbody>
+    </table>
+</div>
+<pre class="expected">| Row 1 | Row 1 |
+| Row 3 | Row 3 |</pre>
+</div>
+
+<!-- /TEST CASES -->
+
+<script src="turndown-plugin-gfm-test.browser.js"></script>
+</body>
+</html>

test/turndown-plugin-gfm-test.js

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+var Attendant = require('turndown-attendant')
+var TurndownService = require('../../to-markdown/lib/turndown.cjs')
+var gfm = require('../lib/turndown-plugin-gfm.cjs').gfm
+
+var attendant = new Attendant({
+  file: __dirname + '/index.html',
+  TurndownService: TurndownService,
+  beforeEach: function (turndownService) {
+    turndownService.use(gfm)
+  }
+})
+
+attendant.run()