SublimeText 3 plugin for SemSem

semsem.py

import sublime, sublime_plugin

class SemSemListener(sublime_plugin.EventListener):
	def on_modified(self, view):
		if not view.settings().get('semsem_go'):
			return
		region = view.sel()[0]
		current = region.begin() - 1
		prev = region.begin() - 2
		sem = view.substr(current)
		semsem = view.substr(prev)
		if semsem == ';' and sem == ';':
			view.run_command('sem_sem')

class SemSemCommand(sublime_plugin.TextCommand):
	def run(self, edit):
		view = self.view
		region = self.view.sel()[0]
		line = view.line(region)
		if line.contains(region) and view.substr(line.end() - 1) != ';':
			view.insert(edit, line.end(), ';')
		if region.end() != line.end():
			erase = sublime.Region(region.begin() - 2, region.begin())
			view.erase(edit, erase)

download and copy to ~/Library/Application Support/Sublime Text 3/ Packages/User/semsem.py

Then in the syntax specific configuration add the following setting
"semsem_ho": true

To activate.

In case it wasn't clear, this is a plugin to allow typing semicolons at the end of any line by typing ;; anywhere on that line. Since there's no legitimate use-case for a double-sem and jumping to the end of the line uses different key combos on different platforms. if the cursor is already at the end of the line, you can type as many semicolons as you want.