Git history for a selected file (#864)

jupyterlab_git/git.py

@@ -432,16 +432,24 @@ async def status(self, path):
 
         return data
 
-    async def log(self, path, history_count=10):
+    async def log(self, path, history_count=10, follow_path=None):
         """
         Execute git log command & return the result.
         """
+        is_single_file = follow_path != None
         cmd = [
             "git",
             "log",
             "--pretty=format:%H%n%an%n%ar%n%s",
             ("-%d" % history_count),
         ]
+        if is_single_file:
+            cmd = cmd + [
+                "--numstat",
+                "--follow",
+                "--",
+                follow_path,
+            ]
         code, my_output, my_error = await execute(
             cmd,
             cwd=path,
@@ -450,30 +458,28 @@ async def log(self, path, history_count=10):
             return {"code": code, "command": " ".join(cmd), "message": my_error}
 
         result = []
+        if is_single_file:
+            # an extra newline get outputted when --numstat is used
+            my_output = my_output.replace("\n\n", "\n")
         line_array = my_output.splitlines()
         i = 0
-        PREVIOUS_COMMIT_OFFSET = 4
+        PREVIOUS_COMMIT_OFFSET = 5 if is_single_file else 4
         while i < len(line_array):
+            commit = {
+                "commit": line_array[i],
+                "author": line_array[i + 1],
+                "date": line_array[i + 2],
+                "commit_msg": line_array[i + 3],
+                "pre_commit": "",
+            }
+
+            if is_single_file:
+                commit["is_binary"] = line_array[i + 4].startswith("-\t-\t")
+
             if i + PREVIOUS_COMMIT_OFFSET < len(line_array):
-                result.append(
-                    {
-                        "commit": line_array[i],
-                        "author": line_array[i + 1],
-                        "date": line_array[i + 2],
-                        "commit_msg": line_array[i + 3],
-                        "pre_commit": line_array[i + PREVIOUS_COMMIT_OFFSET],
-                    }
-                )
-            else:
-                result.append(
-                    {
-                        "commit": line_array[i],
-                        "author": line_array[i + 1],
-                        "date": line_array[i + 2],
-                        "commit_msg": line_array[i + 3],
-                        "pre_commit": "",
-                    }
-                )
+                commit["pre_commit"] = line_array[i + PREVIOUS_COMMIT_OFFSET]
+
+            result.append(commit)
             i += PREVIOUS_COMMIT_OFFSET
         return {"code": code, "commits": result}
 

jupyterlab_git/handlers.py

@@ -196,7 +196,7 @@ async def post(self, path: str = ""):
 
 class GitLogHandler(GitHandler):
     """
-    Handler for 'git log --pretty=format:%H-%an-%ar-%s'.
+    Handler for 'git log'.
     Fetches Commit SHA, Author Name, Commit Date & Commit Message.
     """
 
@@ -208,7 +208,10 @@ async def post(self, path: str = ""):
         """
         body = self.get_json_body()
         history_count = body.get("history_count", 25)
-        result = await self.git.log(self.url2localpath(path), history_count)
+        follow_path = body.get("follow_path")
+        result = await self.git.log(
+            self.url2localpath(path), history_count, follow_path
+        )
 
         if result["code"] != 0:
             self.set_status(500)

jupyterlab_git/tests/test_handlers.py

@@ -281,7 +281,7 @@ async def test_log_handler(mock_git, jp_fetch, jp_root_dir):
     )
 
     # Then
-    mock_git.log.assert_called_with(str(local_path), 20)
+    mock_git.log.assert_called_with(str(local_path), 20, None)
 
     assert response.code == 200
     payload = json.loads(response.body)
@@ -301,7 +301,7 @@ async def test_log_handler_no_history_count(mock_git, jp_fetch, jp_root_dir):
     )
 
     # Then
-    mock_git.log.assert_called_with(str(local_path), 25)
+    mock_git.log.assert_called_with(str(local_path), 25, None)
 
     assert response.code == 200
     payload = json.loads(response.body)