Sublime reason format on save

ReasonFormatOnSave.py

# https://stackoverflow.com/questions/42233292/sublimetext-typescript-format-on-save
import sublime
import sublime_plugin
import subprocess

class FormatReasonOnSave(sublime_plugin.EventListener):
    def on_pre_save(self, view):
        if "Reason" in view.settings().get("syntax"):
            subprocess.Popen(['refmt', '--in-place', view.file_name()],
                               stdout=subprocess.PIPE)