Improve linter with --format json

[maxim]

Hi!

I made a slightly improved erb linter, here's the py file:

import json
import re
from SublimeLinter.lint import util, Linter, LintMatch

class ERBLint(Linter):
    cmd = 'bundle exec erblint ${args} -f json ${temp_file}'
    regex = None
    multiline = True
    tempfile_suffix = 'erb'
    error_stream = util.STREAM_STDOUT
    defaults = {
        'selector': 'text.html.ruby, text.html.rails'
    }

    def get_code_and_message(self, s):
        return re.match(r'^(?:(?P<code>\w+\/\w+):\s)?(?P<message>.*)$', s)

    def find_errors(self, output):
        content = json.loads(output)

        for entry in content['files']:
            if not entry['offenses']:
                continue

            for offense in entry['offenses']:
                match = self.get_code_and_message(offense['message'])

                yield LintMatch(
                    match=offense,
                    line=offense['location']['start_line'] - 1,
                    col=offense['location']['start_column'],
                    end_line=offense['location']['last_line'] - 1,
                    end_col=offense['location']['last_column'],
                    error_type='warning',
                    code=match.group('code'),
                    message=match.group('message')
                )

This has the following improvements over the current linter:

1. More specific highlights within each line
2. Separates rubocop's prefixes as "code" from the message
3. Adds selector text.html.rails
4. Uses bundle exec (but probably should be made optional)

It's been working well for me so far, so decided to share.

If you want to use it, create a dir under your Sublime's "Packages" dir, like Packages/sublimelinter-custom-erblint, throw this file (name it linter.py), and if you have SublimeLinter installed, this should immediately start working.

Hopefully this will make its way into SublimeLinter-contrib-erblint eventually.

[kaste]

This looks interesting. Actually, --stdin is also supported. Maybe you want to make a PR against https://github.com/SublimeLinter/SublimeLinter-erblint

I think https://github.com/Shopify/erb_lint/blob/main/lib/erb_lint/reporters/json_reporter.rb#L59 what we call code (aka rule name) is here under the name linter.