Write previous and current coverage percentages

Author: olivier-lacroix

action.yml

@@ -118,6 +118,12 @@ outputs:
       you'll need to run the action in workflow_run mode to post it. If
       "false", no comment file was written (likely because the comment was
       already posted to the PR).
+  COVERAGE_PERCENTAGE:
+    description: >
+      The coverage percentage of the pull request.
+  REFERENCE_COVERAGE_PERCENTAGE:
+    description: >
+      The coverage percentage of the base branch.
 runs:
   using: docker
   image: Dockerfile

coverage_comment/github.py

@@ -7,6 +7,7 @@
 import re
 import sys
 import zipfile
+from typing import Any
 from urllib.parse import urlparse
 
 from coverage_comment import github_client, log
@@ -209,7 +210,7 @@ def post_comment(
             raise CannotPostComment from exc
 
 
-def set_output(github_output: pathlib.Path | None, **kwargs: bool) -> None:
+def set_output(github_output: pathlib.Path | None, **kwargs: Any) -> None:
     if github_output:
         with github_output.open("a") as f:
             for key, value in kwargs.items():

coverage_comment/main.py

@@ -268,6 +268,11 @@ def process_pr(
             ],
         )
 
+    outputs = {
+        "COVERAGE_PERCENTAGE": coverage.info.percent_covered,
+        "REFERENCE_COVERAGE_PERCENTAGE": previous_coverage_rate,
+    }
+
     try:
         if config.FORCE_WORKFLOW_RUN or not pr_number:
             raise github.CannotPostComment
@@ -292,14 +297,16 @@ def process_pr(
             filename=config.FINAL_COMMENT_FILENAME,
             content=comment,
         )
-        github.set_output(github_output=config.GITHUB_OUTPUT, COMMENT_FILE_WRITTEN=True)
+        outputs |= {"COMMENT_FILE_WRITTEN": True}
         log.debug("Comment stored locally on disk")
     else:
-        github.set_output(
-            github_output=config.GITHUB_OUTPUT, COMMENT_FILE_WRITTEN=False
-        )
+        outputs |= {"COMMENT_FILE_WRITTEN": False}
         log.debug("Comment not generated")
 
+    github.set_output(
+        github_output=config.GITHUB_OUTPUT,
+        **outputs,
+    )
     return 0