Merge pull request uutils#5077 from starccy/ci-checkshell-workflow

ci: Add a new workflow to check and format shell scripts in `util` dir

.github/workflows/CheckScripts.yml

@@ -0,0 +1,74 @@
+name: CheckScripts
+
+# spell-checker:ignore ludeeus mfinelli
+
+env:
+  SCRIPT_DIR: 'util'
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'util/**/*.sh'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'util/**/*.sh'
+
+# End the current execution if there is a new changeset in the PR.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  shell_check:
+    name: ShellScript/Check
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ShellCheck
+        uses: ludeeus/action-shellcheck@master
+        env:
+          SHELLCHECK_OPTS: -s bash
+        with:
+          severity: warning
+          scandir: ${{ env.SCRIPT_DIR }}
+          format: tty
+
+  shell_fmt:
+    name: ShellScript/Format
+    # no need to run in pr events
+    # shfmt will be performed on main branch when the PR is merged
+    if: github.event_name != 'pull_request'
+    runs-on: ubuntu-latest
+    needs: [ shell_check ]
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup shfmt
+        uses: mfinelli/setup-shfmt@v2
+      - name: Run shfmt
+        shell: bash
+        run: |
+          # show differs first for every files that need to be formatted
+          # fmt options: bash syntax, 4 spaces indent, indent for switch-case
+          echo "## show the differences between formatted and original scripts..."
+          find ${{ env.SCRIPT_DIR }} -name "*.sh" -print0 | xargs -0 shfmt -ln=bash -i 4 -ci -d || true
+          # perform a shell format
+          echo "## perform a shell format..."
+          # ignore the error code because `-d` will always return false when the file has difference
+          find ${{ env.SCRIPT_DIR }} -name "*.sh" -print0 | xargs -0 shfmt -ln=bash -i 4 -ci -w
+      - name: Commit any changes
+        uses: EndBug/add-and-commit@v9
+        with:
+          default_author: github_actions
+          message: "style: auto format by CI (shfmt)"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+