From a20bbbe401de94f0f110cef677dc47da3d62033d Mon Sep 17 00:00:00 2001
From: Marko Cupic <71461781+cupicmarko@users.noreply.github.com>
Date: Mon, 11 Aug 2025 06:30:01 +0200
Subject: [PATCH 1/4] Update coverage.yml

Update coverage job to run on push
---
 .github/workflows/coverage.yml | 38 ++++++++++++++--------------------
 1 file changed, 15 insertions(+), 23 deletions(-)

diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 1071253..b0d7bf1 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -1,34 +1,26 @@
-name: Coverage
+name: Coverage (Push)
 
 on:
   push:
-    branches: [main]
-  pull_request:
-    types: [opened, synchronize, reopened]
-    
+    branches: ['**']  # all branches, including main
+
 permissions:
   contents: read
-  pull-requests: write
+  actions: write
 
 jobs:
-  coverage:
+  coverage-push:
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/checkout@v4
-
-    - name: Install cargo-llvm-cov
-      run: cargo install cargo-llvm-cov
-
-    - name: Install llvm-tools
-      run: rustup component add llvm-tools-preview
+      - uses: actions/checkout@v4
 
-    - name: Run code coverage
-      run: cargo llvm-cov --workspace --lcov --output-path lcov.info --ignore-filename-regex '^examples/'
+      - run: cargo install cargo-llvm-cov
+      - run: rustup component add llvm-tools-preview
+      - run: cargo llvm-cov --workspace --lcov --output-path lcov.info --ignore-filename-regex '^examples/'
 
-    - name: Comment PR with coverage
-      continue-on-error: true
-      uses: romeovs/lcov-reporter-action@v0.4.0
-      with:
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        lcov-file: lcov.info
+      - name: Upload branch coverage artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-lcov
+          path: lcov.info
+          retention-days: 21

From ca4d8d732e7116f38f57ba07c8fa40f1f39ac6f8 Mon Sep 17 00:00:00 2001
From: Marko Cupic <71461781+cupicmarko@users.noreply.github.com>
Date: Mon, 11 Aug 2025 06:32:20 +0200
Subject: [PATCH 2/4] Create coverage-pr.yml

Add job running coverage on PR
---
 .github/workflows/coverage-pr.yml | 148 ++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 .github/workflows/coverage-pr.yml

diff --git a/.github/workflows/coverage-pr.yml b/.github/workflows/coverage-pr.yml
new file mode 100644
index 0000000..c880154
--- /dev/null
+++ b/.github/workflows/coverage-pr.yml
@@ -0,0 +1,148 @@
+name: Coverage (PR)
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+  actions: read
+
+jobs:
+  cov-head:
+    runs-on: ubuntu-latest
+    container:
+      image: rust:1.88
+    outputs:
+      pct: ${{ steps.cov.outputs.coverage }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - run: cargo install cargo-llvm-cov
+      - run: rustup component add llvm-tools-preview
+      - run: cargo llvm-cov --workspace --lcov --output-path lcov.info --ignore-filename-regex '^examples/'
+
+      - name: Upload head coverage artifact (for stacked PRs)
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-lcov
+          path: lcov.info
+          retention-days: 21
+
+      - name: Extract total coverage % (head)
+        id: cov
+        shell: bash
+        run: |
+          pct=$(awk -F: '
+            /^LH:/ {lh += $2}
+            /^LF:/ {lf += $2}
+            END { if (lf>0) printf "%.2f", (lh/lf)*100; else print "0.00" }
+          ' lcov.info)
+          echo "coverage=$pct" >> "$GITHUB_OUTPUT"
+
+  compare-and-comment:
+    needs: cov-head
+    runs-on: ubuntu-latest
+    container:
+      image: rust:1.88
+    steps:
+      # 1) Try to download base artifact from the base branch
+      - name: Download base branch artifact (if present)
+        id: dl
+        uses: dawidd6/action-download-artifact@v6
+        with:
+          name: coverage-lcov
+          branch: ${{ github.event.pull_request.base.ref }}
+          if_no_artifact_found: ignore  # don't fail if missing
+
+      - name: Check if base artifact was found
+        id: base_art
+        shell: bash
+        run: |
+          if [ -f "coverage-lcov/lcov.info" ]; then
+            echo "found=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "found=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      # 2) Fallback: if no artifact, checkout base commit and compute base coverage here
+      - name: Checkout base
+        if: ${{ steps.base_art.outputs.found == 'false' }}
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.base.sha }}
+
+      - name: Install cargo-llvm-cov (fallback path)
+        if: ${{ steps.base_art.outputs.found == 'false' }}
+        run: cargo install cargo-llvm-cov
+
+      - name: Install llvm-tools (fallback path)
+        if: ${{ steps.base_art.outputs.found == 'false' }}
+        run: rustup component add llvm-tools-preview
+
+      - name: Run base coverage (fallback path)
+        if: ${{ steps.base_art.outputs.found == 'false' }}
+        run: cargo llvm-cov --workspace --lcov --output-path base.lcov.info --ignore-filename-regex '^examples/'
+
+      # 3) Extract base coverage (from artifact or from freshly computed fallback)
+      - name: Extract total coverage % (base)
+        id: basecov
+        shell: bash
+        run: |
+          file="coverage-lcov/lcov.info"
+          if [ "${{ steps.base_art.outputs.found }}" != "true" ]; then
+            file="base.lcov.info"
+          fi
+          pct=$(awk -F: '
+            /^LH:/ {lh += $2}
+            /^LF:/ {lf += $2}
+            END { if (lf>0) printf "%.2f", (lh/lf)*100; else print "0.00" }
+          ' "$file")
+          echo "coverage=$pct" >> "$GITHUB_OUTPUT"
+
+      - name: Find existing coverage comment
+        id: find_comment
+        uses: peter-evans/find-comment@v3
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: '<!-- coverage-bot -->'
+
+      - name: Comment only if head < base
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const base = parseFloat(`${{ steps.basecov.outputs.coverage }}`);
+            const head = parseFloat(`${{ needs.cov-head.outputs.pct }}`);
+            if (!(base >= 0) || !(head >= 0)) {
+              core.setFailed(`Bad coverage values. base=${base} head=${head}`);
+              return;
+            }
+            if (head >= base) {
+              core.info(`No drop (head ${head}% >= base ${base}%).`);
+              return;
+            }
+            const delta = (head - base).toFixed(2);
+            const body = `<!-- coverage-bot -->
+            **Coverage (base → head):** \`${base}% → ${head}%\`  ⬇️ ${Math.abs(delta)} pp
+            _Only posts when PR coverage is lower than the base branch's latest push (or freshly computed base)._
+            `;
+            const commentId = `${{ steps.find_comment.outputs.comment-id }}`;
+            if (commentId) {
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: parseInt(commentId, 10),
+                body
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body
+              });
+            }

From 17623597785ebb1e51dbeb63de760755d1af9462 Mon Sep 17 00:00:00 2001
From: Marko Cupic <marko@cupic.dev>
Date: Mon, 25 Aug 2025 14:41:37 +0200
Subject: [PATCH 3/4] Remove the pinned rust version from coverage-pr.yml

---
 .github/workflows/coverage-pr.yml | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/.github/workflows/coverage-pr.yml b/.github/workflows/coverage-pr.yml
index c880154..bdf3d0f 100644
--- a/.github/workflows/coverage-pr.yml
+++ b/.github/workflows/coverage-pr.yml
@@ -12,8 +12,6 @@ permissions:
 jobs:
   cov-head:
     runs-on: ubuntu-latest
-    container:
-      image: rust:1.88
     outputs:
       pct: ${{ steps.cov.outputs.coverage }}
     steps:
@@ -46,13 +44,11 @@ jobs:
   compare-and-comment:
     needs: cov-head
     runs-on: ubuntu-latest
-    container:
-      image: rust:1.88
     steps:
       # 1) Try to download base artifact from the base branch
       - name: Download base branch artifact (if present)
         id: dl
-        uses: dawidd6/action-download-artifact@v6
+        uses: dawidd6/action-download-artifact@ac66b43f0e6a346234dd65d4d0c8fbb31cb316e5
         with:
           name: coverage-lcov
           branch: ${{ github.event.pull_request.base.ref }}

From a5d56fd2c8f52f9f8fd0be7bd9b5d4c6072ffb6f Mon Sep 17 00:00:00 2001
From: Marko Cupic <marko@cupic.dev>
Date: Mon, 25 Aug 2025 14:51:48 +0200
Subject: [PATCH 4/4] Hardcode version for find-comment github-action

---
 .github/workflows/coverage-pr.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/coverage-pr.yml b/.github/workflows/coverage-pr.yml
index bdf3d0f..4a196aa 100644
--- a/.github/workflows/coverage-pr.yml
+++ b/.github/workflows/coverage-pr.yml
@@ -101,7 +101,7 @@ jobs:
 
       - name: Find existing coverage comment
         id: find_comment
-        uses: peter-evans/find-comment@v3
+        uses: peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e
         with:
           issue-number: ${{ github.event.pull_request.number }}
           comment-author: 'github-actions[bot]'