general-formatting-checks.yml

name: General Formatting Checks

on:
  - pull_request
  - push

jobs:
  blank-first-line:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for files starting with a blank line
        run: find . -path './.git' -prune -or -type f -print0 | xargs -0 -L1 bash -c 'head -1 "$0" | grep --binary-files=without-match --regexp="^$"; if [[ "$?" == "0" ]]; then echo "Blank line found at start of $0."; false; fi'

  tabs:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for unnecessary use of true tabs
        run: find . -path './.git' -prune -or \( -not -name 'keywords.txt' -and -type f \) -exec grep --with-filename --line-number --binary-files=without-match --regexp=$'\t' '{}' \; -exec echo 'Tab found.' \; -exec false '{}' +

  trailing:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for trailing whitespace
        run: find . -path './.git' -prune -or -type f -exec grep --with-filename --line-number --binary-files=without-match --regexp='[[:blank:]]$' '{}' \; -exec echo 'Trailing whitespace found.' \; -exec false '{}' +

  line-endings:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for non-Unix line endings
        run: find . -path './.git' -prune -or -type f -exec grep --files-with-matches --binary-files=without-match --regexp=$'\r$' '{}' \; -exec echo 'Non-Unix EOL detected.' \; -exec false '{}' +

  blank-last-line:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for blank lines at end of files
        run: find . -path './.git' -prune -or -type f -print0 | xargs -0 -L1 bash -c 'tail -1 "$0" | grep --binary-files=without-match --regexp="^$"; if [[ "$?" == "0" ]]; then echo "Blank line found at end of $0."; false; fi'

  no-last-newline:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for files that don't end in a newline
        # https://stackoverflow.com/a/25686825
        run: find . -path './.git' -prune -or -type f -print0 | xargs -0 -L1 bash -c 'if test "$(grep --files-with-matches --binary-files=without-match --max-count=1 --regexp='.*' "$0")" && test "$(tail --bytes=1 "$0")"; then echo "No new line at end of $0."; false; fi'