1 files changed, 79 insertions, 0 deletions
diff --git a/app/assets/javascripts/lib/text_utility.js.coffee b/app/assets/javascripts/lib/text_utility.js.coffee
new file mode 100644
index 00000000000..bb2772dfed2
--- /dev/null
+++ b/app/assets/javascripts/lib/text_utility.js.coffee
@@ -0,0 +1,79 @@
+((w) ->
+  w.gl ?= {}
+  w.gl.text ?= {}
+
+  gl.text.randomString = -> Math.random().toString(36).substring(7)
+
+  gl.text.replaceRange = (s, start, end, substitute) ->
+    s.substring(0, start) + substitute + s.substring(end);
+
+  gl.text.selectedText = (text, textarea) ->
+    text.substring(textarea.selectionStart, textarea.selectionEnd)
+
+  gl.text.insertText = (textArea, text, tag, selected, wrap) ->
+    selectedSplit = selected.split('\n')
+    startChar = if not wrap and textArea.selectionStart > 0 then '\n' else ''
+
+    if selectedSplit.length > 1 and not wrap
+      insertText = selectedSplit.map((val) ->
+        if val.indexOf(tag) is 0
+          "#{val.replace(tag, '')}"
+        else
+          "#{tag}#{val}"
+      ).join('\n')
+    else
+      insertText = "#{startChar}#{tag}#{selected}#{if wrap then tag else ' '}"
+
+    if document.queryCommandSupported('insertText')
+      document.execCommand 'insertText', false, insertText
+    else
+      try
+        document.execCommand("ms-beginUndoUnit")
+
+      textArea.value = @replaceRange(
+          text,
+          textArea.selectionStart,
+          textArea.selectionEnd,
+          insertText)
+      try
+        document.execCommand("ms-endUndoUnit")
+
+    @moveCursor(textArea, tag, wrap)
+
+  gl.text.moveCursor = (textArea, tag, wrapped) ->
+    return unless textArea.setSelectionRange
+
+    if textArea.selectionStart is textArea.selectionEnd
+      if wrapped
+        pos = textArea.selectionStart - tag.length
+      else
+        pos = textArea.selectionStart
+
+      textArea.setSelectionRange pos, pos
+
+  gl.text.updateText = (textArea, tag, wrap) ->
+    $textArea = $(textArea)
+    oldVal = $textArea.val()
+    textArea = $textArea.get(0)
+    text = $textArea.val()
+    selected = @selectedText(text, textArea)
+    $textArea.focus()
+
+    @insertText(textArea, text, tag, selected, wrap)
+
+  gl.text.init = (form) ->
+    self = @
+    $('.js-md', form)
+      .off 'click'
+      .on 'click', ->
+        $this = $(@)
+        self.updateText(
+          $this.closest('.md-area').find('textarea'),
+          $this.data('md-tag'),
+          not $this.data('md-prepend')
+        )
+
+  gl.text.removeListeners = (form) ->
+    $('.js-md', form).off()
+
+) window