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CI integration

After correctly setting up clj-kondo, you might want to leverage its powers during the test / build phase your project.

Using CI-specific configuration

Since clj-kondo merges configuration files and gives precedence to config files provided explicitly, a useful thing to do when integrating it with your CI workflow is to specify a custom configuration file, such as .clj-kondo/ci-config.edn with CI-specific overrides.

Then put in your pipeline the execution of the tool as

clj-kondo --lint src --config .clj-kondo/ci-config.edn

In this way, you can keep your configuration in the standard config.edn file and that will continue to work during development, with the overrides only be used during CI.

Pre-commit hook

You can use this pre-commit hook to run clj-kondo over files you changed before committing them. Save it into .git/hooks/pre-commit.

#!/bin/sh

# To enable this hook, rename this file to "pre-commit".

if git rev-parse --verify HEAD >/dev/null 2>&1
then
    against=HEAD
else
    # Initial commit: diff against an empty tree object
    against=$(git hash-object -t tree /dev/null)
fi

if !(git diff --cached --name-only --diff-filter=AM $against | grep -E '.clj[cs]?$' | xargs clj-kondo --lint)
then
    echo
    echo "Error: new clj-kondo errors found. Please fix them and retry the commit."
    exit 1
fi

exec git diff-index --check --cached $against --

Also check out these resources:

GitHub

A number of GitHub Actions that use clj-kondo are available:

Linter Output Integration

Github Actions can integrate with clj-kondo output using a custom output pattern. To enable this, set clj-kondo's config to:

{:output {:pattern "::{{level}} file={{filename}},line={{row}},col={{col}}::{{message}}"}}

Example configuration with action setup-clj-kondo:

on: push
name: Push / PR Builder
jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
    - name: Setup clj-kondo
      uses: DeLaGuardo/setup-clj-kondo@822352b8aa37d5c94135e67f7b4e2f46c08008a8
      with:
        version: '2020.04.05'

    - uses: actions/checkout@v2

    - name: Lint
      run: clj-kondo --lint src --config '{:output {:pattern "::{{level}} file={{filename}},line={{row}},col={{col}}::{{message}}"}}'

For more information on Github Action Commands, see Workflow Commands for Github Actions.

Other resources