Sublime Text 3 plugin for in-/decrementing a multi-selection or creating an ordered (incrementing) list (starting with the value of first selection) #sublimetext

inc-dec.py

import sublime, sublime_plugin

class IncrementSelectionCommand(sublime_plugin.TextCommand):
    # increments each selected number by one
    def run(self, edit):
        for region in self.view.sel():
            value = int(self.view.substr(region))
            self.view.replace(edit, region, str(value + 1))

class DecrementSelectionCommand(sublime_plugin.TextCommand):
    # decrements each selected number by one
    def run(self, edit):
        for region in self.view.sel():
            value = int(self.view.substr(region))
            self.view.replace(edit, region, str(value - 1))

class IncrementSelectionAsListCommand(sublime_plugin.TextCommand):
    # creates an ordered (incrementing) list starting with the value of first selection
    def run(self, edit):
        count = int(self.view.substr(self.view.sel()[0])) # get initial count from first selection
        for region in self.view.sel():
            self.view.replace(edit, region, str(count))
            count += 1

sublime-keymap.json

[
    {
        "keys": ["alt+up"],
        "command": "increment_selection"
    },
    {
        "keys": ["shift+alt+up"],
        "command": "increment_selection_as_list"
    },
    {
        "keys": ["alt+down"],
        "command": "decrement_selection"
    }
]