ci: select Hurl examples by path

Author: lovasoa

.github/workflows/ci.yml

@@ -333,22 +333,85 @@ jobs:
           retention-days: 1
   hurl_examples:
     runs-on: ubuntu-latest
+    env:
+      DIFF_BASE: ${{ github.event.pull_request.base.sha || github.event.merge_group.base_sha || github.event.before }}
+      DIFF_HEAD: ${{ github.event.pull_request.head.sha || github.event.merge_group.head_sha || github.sha }}
     outputs:
       examples: ${{ steps.examples.outputs.examples }}
     steps:
       - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
       - id: examples
+        name: Select relevant Hurl examples
+        shell: bash
         run: |
-          examples="$(find examples -mindepth 2 -maxdepth 2 -name test.hurl -print | sed 's#/test.hurl$##' | sort | jq -R -s -c 'split("\n")[:-1]')"
+          set -euo pipefail
+          all_examples() {
+            find examples -mindepth 2 -maxdepth 2 -name test.hurl -print \
+              | sed 's#/test.hurl$##' \
+              | sort \
+              | jq -R -s -c 'split("\n")[:-1]'
+          }
+
+          if [[ "$GITHUB_REF_TYPE" == tag || -z "$DIFF_BASE" || -z "$DIFF_HEAD" || "$DIFF_BASE" =~ ^0+$ ]]; then
+            examples="$(all_examples)"
+          elif ! git cat-file -e "${DIFF_BASE}^{commit}" || ! git cat-file -e "${DIFF_HEAD}^{commit}"; then
+            echo "Could not resolve the event's diff range; running all Hurl examples."
+            examples="$(all_examples)"
+          elif ! changed_paths="$(git diff --name-only "${DIFF_BASE}...${DIFF_HEAD}")"; then
+            echo "Could not compare the event's commits; running all Hurl examples."
+            examples="$(all_examples)"
+          else
+            declare -A selected=()
+            run_all=false
+            while IFS= read -r path; do
+              case "$path" in
+                # Build, harness, or workflow changes can affect every example.
+                Dockerfile|.dockerignore|Cargo.toml|Cargo.lock|build.rs|\
+                .cargo/*|scripts/*|.github/workflows/ci.yml)
+                  run_all=true
+                  ;;
+                # These suites cover telemetry and SMTP integrations end to end.
+                src/telemetry.rs|src/main.rs|src/webserver/http.rs|\
+                src/webserver/database/execute_queries.rs)
+                  selected["examples/telemetry"]=1
+                  ;;
+                src/app_config.rs|src/webserver/database/sqlpage_functions/functions/send_mail.rs)
+                  selected["examples/sending emails"]=1
+                  ;;
+                # Example-local edits run that example's Hurl suite.
+                examples/*)
+                  relative_path="${path#examples/}"
+                  example="examples/${relative_path%%/*}"
+                  [[ -f "$example/test.hurl" ]] && selected["$example"]=1
+                  ;;
+              esac
+            done <<< "$changed_paths"
+
+            if [[ "$run_all" == true ]]; then
+              examples="$(all_examples)"
+            elif ((${#selected[@]} == 0)); then
+              examples='[]'
+            else
+              examples="$(printf '%s\n' "${!selected[@]}" | sort | jq -R -s -c 'split("\n")[:-1]')"
+            fi
+          fi
           echo "examples=$examples" >> "$GITHUB_OUTPUT"
+          if [[ "$examples" == '[]' ]]; then
+            echo 'No Hurl examples match these changes; Rust and Playwright checks still run.' >> "$GITHUB_STEP_SUMMARY"
+          else
+            echo "Selected Hurl examples: $examples" >> "$GITHUB_STEP_SUMMARY"
+          fi
       - name: Restore Hurl archive
         id: hurl-cache
+        if: steps.examples.outputs.examples != '[]'
         uses: actions/cache@v6
         with:
           path: .cache/hurl
           key: hurl-${{ runner.os }}-x86_64-unknown-linux-gnu-${{ env.HURL_VERSION }}
       - name: Download Hurl archive
-        if: steps.hurl-cache.outputs.cache-hit != 'true'
+        if: steps.examples.outputs.examples != '[]' && steps.hurl-cache.outputs.cache-hit != 'true'
         run: |
           set -euo pipefail
           archive="hurl-${HURL_VERSION}-x86_64-unknown-linux-gnu.tar.gz"
@@ -363,6 +426,7 @@ jobs:
             test "$expected_sha" = "$actual_sha"
           )
       - name: Upload Hurl archive
+        if: steps.examples.outputs.examples != '[]'
         uses: actions/upload-artifact@v7
         with:
           name: hurl-${{ env.HURL_VERSION }}-x86_64-unknown-linux-gnu
@@ -373,6 +437,7 @@ jobs:
   hurl:
     name: hurl (${{ matrix.example }})
     runs-on: ubuntu-latest
+    if: ${{ needs.hurl_examples.outputs.examples != '[]' }}
     timeout-minutes: 15
     needs:
       - docker_build