diffkit/.github/workflows/ci.yml at main · umer-78/diffkit · GitHub

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name: CI

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        # The oldest version go.mod claims to support, and a current one. The
        # first cut of this used testing.B.Loop, which is Go 1.24 only: it built
        # on the newer toolchain in development and failed CI on 1.22. A module
        # that declares 1.22 has to build on 1.22.
        go-version: ['1.22', '1.24']
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version: ${{ matrix.go-version }}
      - name: Formatting
        run: test -z "$(gofmt -l .)"
      - name: Vet
        run: go vet ./...
      - name: Test with the race detector
        run: go test -race -cover ./...
      - name: Build
        run: go build -trimpath -o /tmp/diffkit ./cmd/diffkit

      - name: Diff, and check the output against GNU diff
        run: |
          /tmp/diffkit diff testdata/config-old.txt testdata/config-new.txt || true
          /tmp/diffkit stat testdata/config-old.txt testdata/config-new.txt || true
          /tmp/diffkit diff testdata/config-old.txt testdata/config-new.txt > /tmp/ours.diff || true
          diff -U3 testdata/config-old.txt testdata/config-new.txt > /tmp/gnu.diff || true
          tail -n +3 /tmp/ours.diff > /tmp/ours.body
          tail -n +3 /tmp/gnu.diff  > /tmp/gnu.body
          diff /tmp/ours.body /tmp/gnu.body
          echo "hunks match GNU diff"

      - name: The patch it emits is the patch it reads
        run: |
          /tmp/diffkit apply testdata/config-old.txt /tmp/ours.diff > /tmp/applied.txt
          diff /tmp/applied.txt testdata/config-new.txt
          echo "round trip clean"

      - name: A patch that does not match is refused
        run: |
          if /tmp/diffkit apply testdata/merge-base.txt /tmp/ours.diff; then
            echo "a mismatched patch was applied, which it must not be"
            exit 1
          fi

      - name: Merge, cleanly and with conflicts
        run: |
          /tmp/diffkit merge testdata/merge-base.txt testdata/merge-ours.txt testdata/merge-theirs.txt
          if /tmp/diffkit merge testdata/merge-base.txt testdata/conflict-ours.txt testdata/conflict-theirs.txt; then
            echo "a conflicting merge must not exit zero"
            exit 1
          fi

      - name: What each algorithm costs on 4,000 lines
        run: |
          python3 - <<'PY'
          import random
          random.seed(5)
          lines = [f"line {i}: {random.choice(['alpha','beta','gamma','delta'])} value={i*7%1000}" for i in range(4000)]
          open('/tmp/big_a.txt','w').write("\n".join(lines)+"\n")
          b = list(lines)
          for i in (100, 900, 1800, 2500, 3300):
              b[i] = b[i].replace("value=", "VALUE=")
          b.insert(2000, "an inserted line")
          open('/tmp/big_b.txt','w').write("\n".join(b)+"\n")
          PY
          /tmp/diffkit compare /tmp/big_a.txt /tmp/big_b.txt

      - name: Benchmarks
        run: go test ./internal/diff/ -run XXX -bench . -benchtime 20x

  docker:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Build the image
        run: docker build -t diffkit:ci .
      - name: Run it
        run: docker run --rm diffkit:ci --help