Generate a coverage report in CI

.github/workflows/checkdiff.yml

@@ -1,4 +1,4 @@
-name: Code coverage checking
+name: Diff completeness check
 on: pull_request
 
 jobs:

.github/workflows/checkformat.yml

@@ -9,4 +9,4 @@ jobs:
         uses: actions/checkout@v4
       - name: Check format
         run: |
-          ./contrib/checkformat.bash
+          contrib/checkformat.bash

.github/workflows/coverage.yml

@@ -0,0 +1,30 @@
+name: Code coverage report
+on:
+  - push
+  - pull_request
+
+jobs:
+  coverage:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+      - name: Install deps
+        shell: bash
+        run: |
+          ./.github/scripts/install_deps.sh ubuntu
+      - name: Install LCOV
+        run: |
+          sudo apt-get install lcov
+      - name: Install test dependency dependencies
+        shell: bash
+        run: |
+          test/fetch-test-deps.sh --get-deps ubuntu
+      - name: Generate coverage report
+        run: |
+          contrib/coverage.bash false
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage

contrib/coverage.bash

@@ -2,7 +2,6 @@
 set -e
 
 # Build RGBDS with gcov support
-
 make coverage -j
 
 # Run the tests
@@ -15,13 +14,20 @@ popd
 gcov src/**/*.cpp
 mkdir -p coverage
 
-# Generate coverage report
-lcov -c --no-external -d . -o coverage/coverage.info --ignore-errors format,inconsistent,unsupported
-genhtml -f -s -o coverage/ coverage/coverage.info --ignore-errors category,corrupt,inconsistent
+# Check whether running from coverage.yml workflow
+if [ "$1" != "false" ]; then
+  # Generate coverage report
+  lcov -c --no-external -d . -o coverage/coverage.info --ignore-errors format,inconsistent,unsupported
+  genhtml -f -s -o coverage/ coverage/coverage.info --ignore-errors category,corrupt,inconsistent
 
-# Open report in web browser
-if [ "$(uname)" == "Darwin" ]; then
-  open coverage/index.html
+  # Open report in web browser
+  if [ "$(uname)" == "Darwin" ]; then
+    open coverage/index.html
+  else
+    xdg-open coverage/index.html
+  fi
 else
-  xdg-open coverage/index.html
+  # Generate coverage report
+  lcov -c --no-external -d . -o coverage/coverage.info
+  genhtml -f -s -o coverage/ coverage/coverage.info
 fi