Fast rubocop autocorrection alias

Parallel autocorrection is now possible and the default since Rubocop 1.32

https://github.com/rubocop/rubocop/releases/tag/v1.32.0

The rubocop binary has a few interesting flags:

rubocop (using the --parallel default ) scans the current repository for linting issues while using multiple CPU cores
rubocop -a (or --autocorrect) safely corrects most offenses while doing a sequential scan
rubocop -A (or --autocorrect-all) also tries to correct unsafe suggestions

Autocorrection takes significantly longer on large projects because of the sequential nature.
To speed things up, you can use the following alias. It first checks in parallel if any files need to be corrected, then passes them to the autocorrection command:

alias fixcops="bundle exec rubocop -p | grep -P \"\A[^:]+(?=:\d+:\d+: )\" --only-matching | xargs --no-run-if-empty bundle exec rubocop -a"

bundle exec rubocop -p quickly scans for issues, listing each affected file
grep -P \"\A[^:]+(?=:\d+:\d+: )\" --only-matching searches for those file names
xargs --no-run-if-empty bundle exec rubocop -a only runs autocorrection on selected files if there are any

Michael Leimstädtner

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Last edit

11 months ago

Florian Leinsinger

License

Source code in this card is licensed under the MIT License.

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Posted by Michael Leimstädtner to makandra dev (2023-06-19 08:49)

Fast rubocop autocorrection alias

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