process snippet only once, fixes #25

.snippets/25.md

@@ -0,0 +1,8 @@
+## Process snippet only once
+<!--
+type: bugfix
+scope: all
+affected: all
+-->
+
+A snippet is now only added once to the changelog, even if it has been touched or modified again at a later point in the commit history timeline.

snippets2changelog/collector.py

@@ -101,6 +101,10 @@ def snippets(self) -> Iterator[Tuple[Commit, Path]]:
         # self._logger.debug(f"collected_snippets: {collected_snippets}, looking for {self.snippets_folder}")
         # collected_snippets: [PosixPath('.snippets/3.md')], looking for .snippets
 
+        # remember which snippets have already been visited to avoid processing
+        # it twice in case it has been touched or modified at a later point
+        processed_snippets = []
+
         # use reversed to have oldest commit as first element
         for idx, commit in reversed(list(enumerate(self.commits()))):
             for file in commit.stats.files.keys():
@@ -113,7 +117,8 @@ def snippets(self) -> Iterator[Tuple[Commit, Path]]:
                     self._logger.warning(f"file {self.snippets_folder / file} is a match")
                     yield (commit, self.snippets_folder / file)
                 """
-                if Path(file) in collected_snippets:
+                if Path(file) in collected_snippets and Path(file) not in processed_snippets:
                     # self._logger.debug(f"file {file} is a match")
                     # file .snippets/3.md is a match
+                    processed_snippets.append(Path(file))
                     yield (commit, Path(file))