Fix parsing multiline entries in git config

RELEASE_NOTES.md

@@ -2,6 +2,8 @@
 
 ## New in git-machete 3.26.2
 
+- fixed: parsing of multiline git config keys (reported by @saveman71)
+
 ## New in git-machete 3.26.1
 
 - fixed: readability of autogenerated PR/MR descriptions

docs/man/git-machete.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "GIT-MACHETE" "1" "Jul 01, 2024" "" "git-machete"
+.TH "GIT-MACHETE" "1" "Jul 03, 2024" "" "git-machete"
 .SH NAME
 git-machete \- git-machete 3.26.2
 .sp

git_machete/git_operations.py

@@ -303,13 +303,15 @@ def get_git_timespec_parsed_to_unix_timestamp(self, date: str) -> int:
     def __ensure_config_loaded(self) -> None:
         if self.__config_cached is None:
             self.__config_cached = {}
-            for config_line in utils.get_non_empty_lines(self._popen_git("config", "--list").stdout):
-                k_v = config_line.split("=", 1)
-                if len(k_v) == 2:
-                    k, v = k_v
-                    self.__config_cached[k.lower()] = v
+            git_config_stdout = self._popen_git("config", "--list", "--null").stdout
+            for config_entry in filter(None, git_config_stdout.split("\0")):
+                # Apparently, even on Windows, this command uses just \n (and not \r\n) to separate config key from value.
+                key_and_value_lines = config_entry.split('\n', 1)
+                if len(key_and_value_lines) == 2:
+                    key, value_lines = key_and_value_lines
+                    self.__config_cached[key.lower()] = value_lines
                 else:
-                    raise UnexpectedMacheteException(f"Cannot parse config line: {config_line}.")
+                    raise UnexpectedMacheteException(f"Cannot parse config entry: {config_entry}.")
 
     def get_config_attr_or_none(self, key: str) -> Optional[str]:
         self.__ensure_config_loaded()

tests/test_git_operations.py

@@ -164,3 +164,8 @@ def test_is_equivalent_tree_or_patch_reachable_when_no_common_ancestor(self) ->
 
         assert git.is_equivalent_tree_reachable(equivalent_to=feature, reachable_from=master) is False
         assert git.is_equivalent_patch_reachable(equivalent_to=feature, reachable_from=master) is False
+
+    def test_git_config_with_newlines(self) -> None:
+        self.repo_sandbox.write_to_file(".git/config", '[foo]\n  bar = "hello\\nworld"')
+        git = GitContext()
+        assert git.get_config_attr_or_none("foo.bar") == "hello\nworld"