text: # NOTE(kaste): Take from https://github.com/randy3k/AlignTab
  
  # Copyright (c) 2015 Randy Lai <randy.cs.lai@gmail.com>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  
  import sublime
  import sublime_plugin
  
  
  class History:
      hist = []
      index = None
  
      def insert(self, user_input):
          if not self.hist or (user_input != self.last() and user_input != "last_regex"):
              self.hist.append(user_input)
              self.index = None
  
      def roll(self, backwards=False):
          if self.index is None:
              self.index = -1 if backwards else 0
          else:
              self.index += -1 if backwards else 1
  
          if self.index == len(self.hist) or self.index < -len(self.hist):
                  self.index = -1 if backwards else 0
  
      def last(self):
          return self.hist[-1] if self.hist else None
  
      def get(self, index=None):
          if not index:
              index = self.index
          return self.hist[index] if self.hist else None
  
      def reset_index(self):
          self.index = None
  
  if 'history' not in globals():
      history = History()
  
  
  class ShellCommandHistory(sublime_plugin.TextCommand):
      def run(self, edit, backwards=False):
          history.roll(backwards)
          self.view.erase(edit, sublime.Region(0, self.view.size()))
          self.view.insert(edit, 0, history.get())
  