From a8544c7cb047596c5bd8bf378c5e2764054f08ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Brunner?= <stephane.brunner@camptocamp.com>
Date: Wed, 30 Oct 2024 10:07:12 +0100
Subject: [PATCH] Add regenerate example files mode

---
 .github/workflows/main.yaml |  9 ++++++++-
 Makefile                    |  3 ++-
 buildtools/check-example    | 11 +++++++++--
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 108253cf5dc8..39549aac7b13 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -34,6 +34,7 @@ jobs:
 
     env:
       PATH: /bin:/usr/bin:/usr/local/bin:/home/runner/.local/bin
+      REGENERATE_EXAMPLES: true
 
     steps:
       - name: GitHub event
@@ -115,7 +116,10 @@ jobs:
           NODE_OPTIONS: --openssl-legacy-provider
         if: github.event_name != 'pull_request_target'
       - run: make check-examples-checker
-        if: github.event_name != 'pull_request_target'
+        if: |
+          github.event_name != 'pull_request_target'
+          && env.REGENERATE_EXAMPLES == 'false'
+
         # Cypress tests
       - run: make serve-gmf-apps &
         if: github.event_name != 'pull_request_target'
@@ -154,6 +158,9 @@ jobs:
           if-no-files-found: ignore
           retention-days: 5
         if: always()
+      - run: find .build/examples-hosted ! -name *-ref.png -type f -exec rm {};
+        if: env.REGENERATE_EXAMPLES == 'true'
+      - run: '[ ${REGENERATE_EXAMPLES} == false ]'
       - uses: actions/upload-artifact@v4
         with:
           name: Examples hosted
diff --git a/Makefile b/Makefile
index 0e614efde42d..2c1bea81eef8 100644
--- a/Makefile
+++ b/Makefile
@@ -303,7 +303,8 @@ contribs/dist: .build/build-dll.timestamp
 	mkdir -p $(dir $@)
 	CI=true LANGUAGE=en_US buildtools/retry node buildtools/check-example.js \
 		.build/examples-hosted/error.html
-	! buildtools/check-example .build/examples-hosted/error.html.png examples/error-ref.png
+	# Only if REGENERATE_EXAMPLES is not true
+	! ( [ ${REGENERATE_EXAMPLES} != true ] && buildtools/check-example .build/examples-hosted/error.html.png examples/error-ref.png )
 	touch $@
 
 # Add --generate as argument to buildtools/check-example to regenerate the reference images
diff --git a/buildtools/check-example b/buildtools/check-example
index 3e34eb37be2d..3c115dbc136e 100755
--- a/buildtools/check-example
+++ b/buildtools/check-example
@@ -85,8 +85,15 @@ def main():
     )
     result = float(result.stdout.decode().splitlines()[-1].split()[1])
     if result > 0.01:
-        print(f"{result} > 0.01 => {diff}")
-        sys.exit(1)
+        if os.environ.get("REGENERATE_EXAMPLES") == "true":
+            shutil.copyfile(current, old_ref)
+            print(f"::error file={old_ref}:: Regenerate the ref image: {old_ref}")
+
+        else:
+            print(f"{result} > 0.01 => {diff}")
+            sys.exit(1)
+    elif os.environ.get("REGENERATE_EXAMPLES") == "true":
+        os.remove(old_ref)
 
 
 if __name__ == "__main__":