elm_format.py

from __future__ import print_function

import subprocess
import os, os.path
import re
import sublime, sublime_plugin


class ElmFormatCommand(sublime_plugin.TextCommand):
    def run(self, edit):

        # Hide the console window on Windows
        shell = False
        path_separator = ':'
        if os.name == "nt":
            shell = True
            path_separator = ';'

        settings = sublime.load_settings('Elm Language Support.sublime-settings')
        binary = settings.get('elm_format_binary', 'elm-format')
        path = settings.get('elm_paths', '')
        if path:
            old_path = os.environ['PATH']
            os.environ['PATH'] = os.path.expandvars(path + path_separator + '$PATH')

        command = [binary, self.view.file_name(), '--yes']
        p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=shell)

        if path:
            os.environ['PATH'] = old_path

        output, errors = p.communicate()

        if errors.strip():
            # If there is a error while running it. It should show the syntax errors
            panel_view = self.view.window().create_output_panel("elm_format")
            panel_view.set_read_only(False)
            panel_view.run_command('erase_view')

            # elm-format should have a --no-color option https://github.com/avh4/elm-format/issues/372
            errors = re.sub('\x1b\[\d{1,2}m', '', errors.strip().decode())

            panel_view.run_command('append', {'characters': errors})
            panel_view.set_read_only(True)
            self.view.window().run_command("show_panel", {"panel": "output.elm_format"})
        else:
            self.view.window().run_command("hide_panel", {"panel": "output.elm_format"})


        if settings.get('debug', False):
            string_settings = sublime.load_settings('Elm User Strings.sublime-settings')
            print(string_settings.get('logging.prefix', '') + '(' + binary + ') ' + str(output.strip()), '\nerrors: ' + str(errors.strip()))
            if str(errors.strip()):
                print('Your PATH is: ', os.environ['PATH'])


class ElmFormatOnSave(sublime_plugin.EventListener):
    def on_post_save(self, view):
        sel = view.sel()[0]
        region = view.word(sel)
        scope = view.scope_name(region.b)
        if scope.find('source.elm') != -1:
            settings = sublime.load_settings('Elm Language Support.sublime-settings')
            if settings.get('elm_format_on_save', True):
                regex = settings.get('elm_format_filename_filter', '')
                if not (len(regex) > 0 and re.search(regex, view.file_name()) is not None):
                    view.run_command('elm_format')