Add replacements for Polar Bear markup language

src/bear-style-code-block.js

@@ -0,0 +1,21 @@
+export default function bearStyleCodeBlock (turndownService) {
+  turndownService.addRule('bearStyleCodeBlock', {
+    filter: function (node) {
+      let child = node.firstChild
+      return (
+        node.nodeName === 'PRE' &&
+        child &&
+        child.nodeName === 'CODE' &&
+          child.classList.contains('code-multiline')
+      )
+    },
+    replacement: function (content, node, options) {
+      let child = node.firstChild
+      return (
+        '\n```' + child.lang + '\n' +
+          child.textContent +
+        '\n' + '```\n'
+      )
+    }
+  })
+}

src/bear-style-todo.js

@@ -0,0 +1,33 @@
+function selectTodoCheckbox (node) {
+  return node.firstElementChild
+}
+
+function selectTodoText (node) {
+  return node.firstElementChild && node.firstElementChild.nextElementSibling
+}
+
+export default function todo (turndownService) {
+  turndownService.addRule('todo', {
+    filter: function (node) {
+      var todoCheckboxElement = selectTodoCheckbox(node)
+      var todoTextElement = selectTodoText(node)
+
+      return node.nodeName === 'LI' &&
+        todoCheckboxElement &&
+        todoTextElement &&
+        todoCheckboxElement.classList.contains('todo-checkbox') &&
+        todoTextElement.classList.contains('todo-text')
+    },
+    replacement: function (content, node) {
+      var checked = selectTodoCheckbox(node)
+        .classList
+        .contains('todo-checked')
+
+      return (
+        checked
+          ? '+ '
+          : '- '
+      ) + content
+    }
+  })
+}

src/bold.js

@@ -0,0 +1,8 @@
+export default function bold (turndownService) {
+  turndownService.addRule('bold', {
+    filter: ['b', 'strong'],
+    replacement: function (content) {
+      return '*' + content + '*'
+    }
+  })
+}

src/highlighted-code-block.js → src/github-style-code-block.js

@@ -1,7 +1,7 @@
 var highlightRegExp = /highlight-(?:text|source)-([a-z0-9]+)/
 
-export default function highlightedCodeBlock (turndownService) {
-  turndownService.addRule('highlightedCodeBlock', {
+export default function githubStyleCodeBlock (turndownService) {
+  turndownService.addRule('githubStyleCodeBlock', {
     filter: function (node) {
       var firstChild = node.firstChild
       return (
@@ -16,9 +16,9 @@ export default function highlightedCodeBlock (turndownService) {
       var language = (className.match(highlightRegExp) || [null, ''])[1]
 
       return (
-        '\n\n' + options.fence + language + '\n' +
-        node.firstChild.textContent +
-        '\n' + options.fence + '\n\n'
+        '\n```' + language + '\n' +
+          node.firstChild.textContent +
+        '\n' + '```\n'
       )
     }
   })

src/github-style-todo.js

@@ -0,0 +1,16 @@
+export default function todo (turndownService) {
+  turndownService.addRule('todo', {
+    filter: function (node) {
+      return node.nodeName === 'LI' &&
+        node.firstChild &&
+        node.firstChild.type === 'checkbox'
+    },
+    replacement: function (content, node) {
+      return (
+        node.firstChild.checked
+          ? '+ '
+          : '- '
+      ) + content
+    }
+  })
+}

src/italic.js

@@ -0,0 +1,8 @@
+export default function italic (turndownService) {
+  turndownService.addRule('italic', {
+    filter: ['i', 'em'],
+    replacement: function (content) {
+      return '/' + content + '/'
+    }
+  })
+}

src/line-separator.js

@@ -0,0 +1,8 @@
+export default function lineSeparator (turndownService) {
+  turndownService.addRule('lineSeparator', {
+    filter: ['hr'],
+    replacement: function () {
+      return '---'
+    }
+  })
+}

src/mark.js

@@ -0,0 +1,8 @@
+export default function mark (turndownService) {
+  turndownService.addRule('mark', {
+    filter: ['mark'],
+    replacement: function (content) {
+      return '::' + content + '::'
+    }
+  })
+}

src/polar-bear.js

@@ -0,0 +1,39 @@
+import bearStyleCodeBlock from './bear-style-code-block'
+import bearStyleTodo from './bear-style-todo'
+import bold from './bold'
+import githubStyleCodeBlock from './github-style-code-block'
+import githubStyleTodo from './github-style-todo'
+import lineSeparator from './line-separator'
+import italic from './italic'
+import mark from './mark'
+import strikethrough from './strikethrough'
+import underline from './underline'
+
+function bear (turndownService) {
+  turndownService.use([
+    bearStyleCodeBlock,
+    bearStyleTodo,
+    bold,
+    githubStyleCodeBlock,
+    githubStyleTodo,
+    italic,
+    lineSeparator,
+    mark,
+    strikethrough,
+    underline
+  ])
+}
+
+export {
+  bear,
+  bearStyleCodeBlock,
+  bearStyleTodo,
+  bold,
+  githubStyleCodeBlock,
+  githubStyleTodo,
+  italic,
+  lineSeparator,
+  mark,
+  strikethrough,
+  underline
+}

src/strikethrough.js

@@ -2,7 +2,7 @@ export default function strikethrough (turndownService) {
   turndownService.addRule('strikethrough', {
     filter: ['del', 's', 'strike'],
     replacement: function (content) {
-      return '~' + content + '~'
+      return '-' + content + '-'
     }
   })
 }

src/underline.js

@@ -0,0 +1,8 @@
+export default function underline (turndownService) {
+  turndownService.addRule('underline', {
+    filter: ['u'],
+    replacement: function (content) {
+      return '_' + content + '_'
+    }
+  })
+}