CI: Add Github runner for Cygwin

Vim can be built for Cygwin with the Unix Makefile, but nothing covers it.
The Windows runner builds with MSVC and MinGW only, and the Cirrus CI job
that was removed in 0abffbff ran FreeBSD alone.

Add a GitHub Actions workflow that configures and builds under Cygwin.  It
runs once per day instead of per push, and skips the run when nothing was
committed since the previous one, because the Cygwin runner is slow.  Only
the tiny test suite, the unit tests and the libvterm tests are run: the
script tests need sockets, PowerShell, network access and POSIX file
permissions, which do not behave the same under Cygwin.

closes: #20970

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/.github/workflows/ci-cygwin.yml b/.github/workflows/ci-cygwin.yml
new file mode 100644 (file)
index 0000000..e473796
--- /dev/null
+++ b/.github/workflows/ci-cygwin.yml
@@ -0,0 +1,118 @@
+name: CI for Cygwin
+
+on:
+  schedule:
+    - cron: '30 23 * * *'  # Run once per day, Cygwin runners are slow
+  workflow_dispatch:
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+jobs:
+  # Skip the run when nothing was committed since the previous one.
+  check:
+    runs-on: ubuntu-24.04
+
+    outputs:
+      changed: ${{ steps.check.outputs.changed }}
+
+    steps:
+      - name: Look for commits in the last day
+        id: check
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          date=$(gh api "repos/${{ github.repository }}/commits?sha=${{ github.ref_name }}" \
+            --jq '.[0].commit.committer.date')
+          if [ "$(date -d "${date}" +%s)" -gt "$(date -d '25 hours ago' +%s)" ]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          fi
+
+  cygwin:
+    needs: check
+    if: needs.check.outputs.changed == 'true' || github.event_name == 'workflow_dispatch'
+
+    runs-on: windows-2022
+
+    env:
+      # Keep Cygwin out of the Windows PATH: the post-checkout cleanup would
+      # run Cygwin's git on a Windows path and fail.  A login shell sets up
+      # the Cygwin PATH, CHERE_INVOKING keeps it in the workspace.
+      CHERE_INVOKING: 1
+      CYGWIN_NOWINPATH: 1
+      SRCDIR: ./src
+      TERM: xterm
+
+    defaults:
+      run:
+        shell: C:\cygwin\bin\bash.exe --login -eo pipefail -o igncr '{0}'
+
+    strategy:
+      fail-fast: false
+      matrix:
+        features: [tiny, normal, huge]
+
+    steps:
+      # Cygwin cannot run shell scripts checked out with CRLF line endings.
+      - name: Set up git
+        shell: pwsh
+        run: git config --global core.autocrlf input
+
+      - name: Checkout repository from GitHub
+        uses: actions/checkout@v7.0.1
+
+      - name: Install Cygwin
+        uses: cygwin/cygwin-install-action@v6
+        with:
+          add-to-path: false
+          packages: >-
+            diffutils
+            gcc-core
+            gettext-devel
+            libiconv-devel
+            libncurses-devel
+            libtool
+            make
+
+      - name: Set up environment
+        run: |
+          (
+          echo "NPROC=$(getconf _NPROCESSORS_ONLN)"
+          # The script tests need sockets, PowerShell, network access and
+          # POSIX file permissions, which do not work the same under Cygwin.
+          case "${{ matrix.features }}" in
+          tiny)
+            echo "TEST=testtiny"
+            ;;
+          *)
+            echo "TEST=unittests test_libvterm"
+            ;;
+          esac
+          ) >> "${GITHUB_ENV}"
+
+      - name: Configure
+        run: |
+          ./configure --with-features=${{ matrix.features }} --disable-gui
+
+      - name: Build
+        timeout-minutes: 20
+        run: |
+          make -j"${NPROC}"
+
+      - name: Check version
+        run: |
+          "${SRCDIR}"/vim --version
+
+      # Run the tests from the src directory: the top level Makefile also runs
+      # the indent and syntax tests, which the Linux runner already covers.
+      - name: Test
+        timeout-minutes: 40
+        run: |
+          cd "${SRCDIR}"
+          make ${TEST}
+
+      - name: Upload failed test artifacts
+        if: ${{ !cancelled() }}
+        uses: ./.github/actions/test_artifacts

diff --git a/Filelist b/Filelist
index 945c87e031c8768efb6c9faa0caf677de927d120..ca9e8a7b992fee34d0876e9c1e8c45e4d8927f68 100644 (file)
--- a/Filelist
+++ b/Filelist
@@ -8,6 +8,7 @@ SRC_ALL =       \
                .github/MAINTAINERS \
                .github/ISSUE_TEMPLATE/bug_report.yml \
                .github/ISSUE_TEMPLATE/feature_request.md \
+               .github/workflows/ci-cygwin.yml \
                .github/workflows/ci-linux.yml \
                .github/workflows/ci-linux_asan.yml \
                .github/workflows/ci-macos.yml \