[mozlint] Add support for fixers

RESOLVED FIXED in Firefox 57


8 months ago
7 months ago


(Reporter: ahal, Assigned: ahal)



Firefox Tracking Flags

(firefox57 fixed)


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Many external linters (e.g eslint, clang-tidy) have the ability to fix the errors that they report. We could also implement a python fixer with the autopep8 module.

It would be nice if mozlint had a best effort --fix argument that could call into these various fixer functions. Linters could declare that they support fixing in their mozlint definitions. Linters that do not declare this would get skipped when running ./mach lint --fix.
I think it's better to copy eslint's behaviour here. So with --fix, anything that can be fixed is, and the rest is printed to stdout. This way there's no need for linters to declare that they have "fixing" capability or anything like that. They either make use of the "fix" config or they don't.

I have a further idea for --fix. I want to add an "edit" mode that will open failing files in an editor (one by one). Then there can be a "mixed" mode which will automatically fix what it can, and open the remaining files in an editor.
Comment hidden (mozreview-request)
Assignee: nobody → ahalberstadt
Blocks: 1387555

Comment 3

7 months ago
Comment on attachment 8893635 [details]
Bug 1379151 - Add --fix and --edit to mozlint,


Looks good. We might want some sort of re-lint after all edits done option, but I think as a starter this is an improvement, especially the official --fix option.
Attachment #8893635 - Flags: review?(standard8) → review+

Comment 4

7 months ago
We're sorry, Autoland could not rebase your commits for you automatically. Please manually rebase your commits and try again.

hg error in cmd: hg rebase -s 611fd94b45a0 -d 8e991e3b80f6: rebasing 412354:611fd94b45a0 "Bug 1379151 - Add --fix and --edit to mozlint, r=standard8" (tip)
merging python/mozlint/mozlint/cli.py
warning: conflicts while merging python/mozlint/mozlint/cli.py! (edit, then use 'hg resolve --mark')
unresolved conflicts (see hg resolve, then hg rebase --continue)

Comment 5

7 months ago
Comment on attachment 8893635 [details]
Bug 1379151 - Add --fix and --edit to mozlint,


Good idea, I'll add that in a follow-up, possibly bug 1387555
Severity: normal → enhancement
Priority: -- → P2
Comment hidden (mozreview-request)

Comment 7

7 months ago
Pushed by ahalberstadt@mozilla.com:
Add --fix and --edit to mozlint, r=standard8
Backed out for breaking Windows builds:


Push with failures: https://treeherder.mozilla.org/#/jobs?repo=autoland&revision=d24be9fbef9836204f401be62d8f4c00623a9b31&filter-resultStatus=testfailed&filter-resultStatus=busted&filter-resultStatus=exception&filter-resultStatus=retry&filter-resultStatus=runnable&filter-resultStatus=usercancel
Failure log: https://treeherder.mozilla.org/logviewer.html#?job_id=122282020&repo=autoland

14:21:15     INFO - ============================= test session starts =============================
14:21:15     INFO - platform win32 -- Python 2.7.11, pytest-3.1.3, py-1.4.34, pluggy-0.4.0 -- z:\build\build\src\obj-firefox\_virtualenv\Scripts\python.exe
14:21:15     INFO - cachedir: ..\python\mozlint\.cache
14:21:15     INFO - rootdir: z:\build\build\src\python\mozlint, inifile:
14:21:15     INFO - collecting ... collected 2 items
14:21:15     INFO - ..\python\mozlint\test\test_cli.py::test_cli_run_with_fix PASSED
14:21:15     INFO - ..\python\mozlint\test\test_cli.py::test_cli_run_with_edit FAILED
14:21:15     INFO - ================================== FAILURES ===================================
14:21:15     INFO - ___________________________ test_cli_run_with_edit ____________________________
14:21:15     INFO - run = <function inner at 0x03D4BBB0>
14:21:15     INFO - parser = MozlintParser(prog='test_cli.py', usage=None, description=None, version=None, ...lass=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)
14:21:15     INFO - capfd = <_pytest.capture.CaptureFixture instance at 0x03D53288>
14:21:15     INFO -     def test_cli_run_with_edit(run, parser, capfd):
14:21:15     INFO -         os.environ['EDITOR'] = 'echo'
14:21:15     INFO -         ret = run(['-f', 'json', '--edit', '--linter', 'external'])
14:21:15     INFO -         out, err = capfd.readouterr()
14:21:15     INFO -         assert ret == 0
14:21:15     INFO - >       assert out.endswith('foobar.js\n')
14:21:15     INFO - E       AssertionError: assert False
14:21:15     INFO - E        +  where False = <built-in method endswith of unicode object at 0x035190E0>('foobar.js\n')
14:21:15     INFO - E        +    where <built-in method endswith of unicode object at 0x035190E0> = 'z:\build\build\src\python\mozlint\test\files\foobar.js
14:21:15     INFO - \n'.endswith
14:21:15     INFO - ..\python\mozlint\test\test_cli.py:47: AssertionError
14:21:15     INFO - ===================== 1 failed, 1 passed in 20.01 seconds =====================
Flags: needinfo?(ahalberstadt)
Comment hidden (mozreview-request)
Sorry for the bustage, thought I had tested this on Windows, but turns out I had pushed it along with another patch and it was the other patch that was making this pass. Latest review push should fix this:
Flags: needinfo?(ahalberstadt)

Comment 11

7 months ago
Pushed by ahalberstadt@mozilla.com:
Add --fix and --edit to mozlint, r=standard8
Last Resolved: 7 months ago
status-firefox57: --- → fixed
Resolution: --- → FIXED
Target Milestone: --- → mozilla57
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