ci: move fmt/clippy into dedicated code-quality workflow

.github/workflows/ci.yml

@@ -19,11 +19,6 @@ jobs:
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
-        with:
-          components: rustfmt, clippy
-
-      - name: Check formatting
-        run: cargo fmt --all -- --check
 
       - name: Build
         run: cargo build --verbose
@@ -31,9 +26,6 @@ jobs:
       - name: Run tests
         run: cargo test --verbose
 
-      - name: Clippy
-        run: cargo clippy --all-targets --all-features -- -D warnings
-
   coverage:
     name: Code coverage (${{ matrix.os }})
     runs-on: ${{ matrix.os }}

.github/workflows/code-quality.yml

@@ -0,0 +1,76 @@
+name: Code Quality
+
+# spell-checker:ignore TERMUX reactivecircus Swatinem  noaudio pkill swiftshader dtolnay juliangruber
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+env:
+  # * style job configuration
+  STYLE_FAIL_ON_FAULT: true ## (bool) fail the build if a style job contains a fault (error or warning); may be overridden on a per-job basis
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+# 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:
+  fmt:
+    name: cargo fmt --all -- --check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - run: rustup component add rustfmt
+      - run: cargo fmt --all -- --check
+
+  style_lint:
+    name: Style/lint
+    runs-on: ${{ matrix.job.os }}
+    env:
+      SCCACHE_GHA_ENABLED: "true"
+      RUSTC_WRAPPER: "sccache"
+    strategy:
+      fail-fast: false
+      matrix:
+        job:
+          - { os: ubuntu-latest }
+          - { os: macos-latest }
+          - { os: windows-latest }
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: stable
+          components: clippy
+      - uses: Swatinem/rust-cache@v2
+      - name: Run sccache-cache
+        uses: mozilla-actions/sccache-action@v0.0.10
+      - name: Initialize workflow variables
+        id: vars
+        shell: bash
+        run: |
+          ## VARs setup
+          outputs() { step_id="${{ github.action }}"; for var in "$@" ; do echo steps.${step_id}.outputs.${var}="${!var}"; echo "${var}=${!var}" >> $GITHUB_OUTPUT; done; }
+          # failure mode
+          unset FAIL_ON_FAULT ; case '${{ env.STYLE_FAIL_ON_FAULT }}' in
+            ''|0|f|false|n|no|off) FAULT_TYPE=warning ;;
+            *) FAIL_ON_FAULT=true ; FAULT_TYPE=error ;;
+          esac;
+          outputs FAIL_ON_FAULT FAULT_TYPE
+      - name: "`cargo clippy` lint testing"
+        shell: bash
+        run: |
+          ## `cargo clippy` lint testing
+          unset fault
+          fault_type="${{ steps.vars.outputs.FAULT_TYPE }}"
+          fault_prefix=$(echo "$fault_type" | tr '[:lower:]' '[:upper:]')
+          # * convert any warnings to GHA UI annotations; ref: <https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-a-warning-message>
+          S=$(cargo clippy --all-targets --workspace -puu_grep -- -D warnings 2>&1) && printf "%s\n" "$S" || { printf "%s\n" "$S" ; printf "%s" "$S" | sed -E -n -e '/^error:/{' -e "N; s/^error:[[:space:]]+(.*)\\n[[:space:]]+-->[[:space:]]+(.*):([0-9]+):([0-9]+).*$/::${fault_type} file=\2,line=\3,col=\4::${fault_prefix}: \`cargo clippy\`: \1 (file:'\2', line:\3)/p;" -e '}' ; fault=true ; }
+          if [ -n "${{ steps.vars.outputs.FAIL_ON_FAULT }}" ] && [ -n "$fault" ]; then exit 1 ; fi