Sublime command that replaces repeated lines with a single instance prefixed with a count (much like uniq -c).

count_consecutive_duplicate_lines.py

import sublime, sublime_plugin

class CountConsecutiveDuplicateLinesCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    # end and start mark the beginning and end of the current region to replace,
    # working backwards.
    start = end = self.view.size()

    # Preserve trailing newline if last line is empty.
    if self.view.line(end).empty():
      start = end = end - 1

    prevText = None
    count = 0

    # Once start hits -1, we've reached the beginning and are done.
    while start > -1:
      line = self.view.line(start - 1)
      text = self.view.substr(line)

      # Start a new section.
      if prevText is None:
        prevText = text
        start = line.begin()
        count += 1

      # End of section reached; replace text.
      elif text != prevText or start == 0:
        replaceRegion = sublime.Region(start, end)
        self.view.replace(edit, replaceRegion, str(count) + ' ' + prevText)
        start = end = start - 1
        prevText = None
        count = 0

      # Another occurrence. Expand replacement region and increment count.
      elif text == prevText:
        count += 1
        start = line.begin()