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Add check for pull requests (GitHub action) #892

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Add check for pull requests (GitHub action) #892

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43 changes: 43 additions & 0 deletions .github/workflows/pr_check.yml
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# Check pull requests.

name: Check pull request

# https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows
on:
# Trigger workflow on pull request.
pull_request:
# branches: [ ci ]

jobs:
check_pull_request:
runs-on: ubuntu-latest

steps:
- uses: actions/checkout@v4
- name: Fetching base and head commit (pull_request)
# Source for this step: https://github.com/JensDll/should-run
if: github.event_name == 'pull_request'
run: |
git fetch --no-tags --prune --no-recurse-submodules --depth=$((${{ github.event.pull_request.commits }} + 1)) origin ${{ github.event.pull_request.head.sha }}
git fetch --no-tags --prune --no-recurse-submodules --depth=10 origin ${{ github.event.pull_request.base.sha }}
git checkout --progress --force ${{ github.event.pull_request.head.sha }}

while [[ -n $(git rev-list shallow ^${{ github.event.pull_request.base.sha }}) ]]
do
git fetch --no-tags --prune --no-recurse-submodules --deepen=10 origin ${{ github.event.pull_request.base.sha }}
done

base=$(git rev-list ${{ github.event.pull_request.head.sha }} ^${{ github.event.pull_request.base.sha }} | tail --lines 1 | xargs -I {} git rev-parse {}~1)

echo "BASE=$base" >> $GITHUB_ENV
echo "HEAD=${{ github.event.pull_request.head.sha }}" >> $GITHUB_ENV
- name: Check for whitespace issues.
run: |
if git log --check ${{ env.BASE }}...${{ env.HEAD }} | grep "^[^:+]*:[0-9]*:"; then
echo "Found whitespace issues in pull request"
false
else
echo "No whitespace issues in pull request"
true
fi
# TODO: Add more checks here (codespell, ...).
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