From eec0c109324655b56df0525998141afff62dc7c8 Mon Sep 17 00:00:00 2001
From: Samuel Moelius <sam@moeli.us>
Date: Wed, 1 Nov 2023 12:58:44 -0400
Subject: [PATCH] Compute coverage in CI

---
 .github/workflows/ci.yml       | 35 --------------------
 .github/workflows/coverage.yml | 58 ++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 35 deletions(-)
 create mode 100644 .github/workflows/coverage.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 328e05e23..45fc45bbc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -182,38 +182,3 @@ jobs:
 
     steps:
       - run: true
-
-  coverage:
-    # smoelius: Disable coverage until the following issue is resolved:
-    # https://github.com/taiki-e/cargo-llvm-cov/issues/128
-    if: ${{ false }}
-
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install dylint-link
-        run: cargo install --path ./dylint-link
-
-      - name: Install cargo-llvm-cov
-        run: cargo install cargo-llvm-cov
-
-      - name: Install llvm-tools-preview
-        run: rustup +nightly component add llvm-tools-preview
-
-      - name: Coverage
-        run: cargo llvm-cov --failure-mode all --lcov --output-path workspace.lcov
-        env:
-          RUSTUP_TOOLCHAIN: nightly
-
-      - name: Install lcov
-        run: sudo apt install lcov
-
-      - name: Generate html
-        run: genhtml --output-directory artifacts/html workspace.lcov
-
-      - uses: actions/upload-artifact@v3
-        with:
-          name: Coverage
-          path: artifacts
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
new file mode 100644
index 000000000..6a447a3ee
--- /dev/null
+++ b/.github/workflows/coverage.yml
@@ -0,0 +1,58 @@
+name: Coverage
+
+on:
+  schedule:
+    - cron: "0 3 * * 2" # 2 = Tuesday
+  workflow_dispatch:
+
+concurrency:
+  group: coverage-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ssh-key: ${{ secrets.PR_SSH_KEY }}
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            ~/.dylint_drivers/
+            ~/.rustup/toolchains/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Install dylint-link
+        run: cargo install --path ./dylint-link
+
+      - name: Install cargo-llvm-cov
+        run: cargo install cargo-llvm-cov
+
+      - name: Coverage
+        run: |
+          for X in . driver utils/linting; do
+            pushd "$X"
+            cargo llvm-cov --failure-mode all --lcov --output-path coverage.lcov
+            popd
+          done
+
+      - name: Install lcov
+        run: sudo apt install lcov
+
+      - name: Generate html
+        run: find . -name coverage.lcov -print0 | xargs -0 genhtml --output-directory coverage coverage.lcov
+
+      - name: Push to gh-pages branch
+        run: |
+          git commit coverage -m Coverage
+          git push origin ${{ github.ref }}:gh-pages --force