Sublime Text 3 plugin to toggle and timestamp markdown todo checkboxes

MarkdownCheckboxes.py

# ~/.config/sublime-text-3/Packages/User/MarkdownCheckboxes.py

import sublime, sublime_plugin
import re
from time import strftime

def now():
  return strftime("%Y-%m-%dT%H:%M:%S")

timestampRegex = r"\s*\(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\)"

def toggleCheckbox(line):
  if "[ ]" in line:
    timestamp = " (" + now() + ")"
    return line.replace("[ ]", "[x]") + timestamp
  elif "[x]" in line:
    unchecked = line.replace("[x]", "[ ]")
    undated = re.sub(timestampRegex, "", unchecked)
    return undated
  else:
    return line

class ToggleMarkdownCheckboxCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    # self.view.insert(edit, 0, "hello world")
    for region in self.view.sel():
      # just look at lines with a cusor, not a selection
      if region.empty():
        line = self.view.line(region)
        lineContents = self.view.substr(line)
        newLineContents = toggleCheckbox(lineContents)
        self.view.replace(edit, line, newLineContents)

user.sublime-keymap

[
	{"keys": ["shift+enter"], "command": "toggle_markdown_checkbox"}
]

On a user-defined shortkey (I like shift+enter), toggle and timestamp a markdown checkbox between:

- [ ] buy coconut milk

and:

- [x] buy coconut milk (2020-06-03T16:40:47)