skip incremental review if no file changed since last review

pr_agent/git_providers/github_provider.py

@@ -38,6 +38,7 @@ def __init__(self, pr_url: Optional[str] = None, incremental=IncrementalPR(False
             self.set_pr(pr_url)
             self.pr_commits = list(self.pr.get_commits())
             if self.incremental.is_incremental:
+                self.file_set = dict()
                 self.get_incremental_commits()
             self.last_commit_id = self.pr_commits[-1]
             self.pr_url = self.get_pr_url() # pr_url for github actions can be as api.github.com, so we need to get the url from the pr object
@@ -62,7 +63,7 @@ def get_incremental_commits(self):
         if self.previous_review:
             self.incremental.commits_range = self.get_commit_range()
             # Get all files changed during the commit range
-            self.file_set = dict()
+
             for commit in self.incremental.commits_range:
                 if commit.commit.message.startswith(f"Merge branch '{self._get_repo().default_branch}'"):
                     get_logger().info(f"Skipping merge commit {commit.commit.message}")

pr_agent/tools/pr_reviewer.py

@@ -107,6 +107,15 @@ async def run(self) -> None:
             relevant_configs = {'pr_reviewer': dict(get_settings().pr_reviewer),
                                 'config': dict(get_settings().config)}
             get_logger().debug("Relevant configs", artifacts=relevant_configs)
+
+            if self.incremental.is_incremental and hasattr(self.git_provider, "file_set") and not self.git_provider.file_set:
+                get_logger().info(f"Incremental review is enabled for {self.pr_url} but there are no new files")
+                if hasattr(self.git_provider, "previous_review"):
+                    previous_review_url = self.git_provider.previous_review.html_url
+                if get_settings().config.publish_output:
+                    self.git_provider.publish_comment(f"Incremental Review Skipped\nNo files were changed since the [previous PR Review]({previous_review_url})",  is_temporary=True)
+                return None
+
             if get_settings().config.publish_output:
                 self.git_provider.publish_comment("Preparing review...", is_temporary=True)
 
@@ -212,11 +221,7 @@ def _prepare_pr_review(self) -> str:
         if self.incremental.is_incremental:
             last_commit_url = f"{self.git_provider.get_pr_url()}/commits/" \
                               f"{self.git_provider.incremental.first_new_commit_sha}"
-            last_commit_msg = self.incremental.commits_range[0].commit.message if self.incremental.commits_range else ""
             incremental_review_markdown_text = f"Starting from commit {last_commit_url}"
-            if last_commit_msg:
-                replacement = last_commit_msg.splitlines(keepends=False)[0].replace('_', r'\_')
-                incremental_review_markdown_text += f"  \n_({replacement})_"
 
         markdown_text = convert_to_markdown(data, self.git_provider.is_supported("gfm_markdown"),
                                             incremental_review_markdown_text)