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Fix up the commit trailers functionality#1576

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Merged
Byron merged 5 commits intogitpython-developers:mainfromitsluketwist:fix-trailers
Apr 23, 2023
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102 changes: 80 additions & 22 deletionsgit/objects/commit.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -26,6 +26,7 @@
import os
from io import BytesIO
import logging
from collections import defaultdict


# typing ------------------------------------------------------------------
Expand DownExpand Up@@ -335,8 +336,72 @@ def stats(self) -> Stats:
return Stats._list_from_string(self.repo, text)

@property
def trailers(self) -> Dict:
"""Get the trailers of the message as dictionary
def trailers(self) -> Dict[str, str]:
"""Get the trailers of the message as a dictionary

:note: This property is deprecated, please use either ``Commit.trailers_list`` or ``Commit.trailers_dict``.

:return:
Dictionary containing whitespace stripped trailer information.
Only contains the latest instance of each trailer key.
"""
return {
k: v[0] for k, v in self.trailers_dict.items()
}

@property
def trailers_list(self) -> List[Tuple[str, str]]:
"""Get the trailers of the message as a list

Git messages can contain trailer information that are similar to RFC 822
e-mail headers (see: https://git-scm.com/docs/git-interpret-trailers).

This functions calls ``git interpret-trailers --parse`` onto the message
to extract the trailer information, returns the raw trailer data as a list.

Valid message with trailer::

Subject line

some body information

another information

key1: value1.1
key1: value1.2
key2 : value 2 with inner spaces


Returned list will look like this::

[
("key1", "value1.1"),
("key1", "value1.2"),
("key2", "value 2 with inner spaces"),
]


:return:
List containing key-value tuples of whitespace stripped trailer information.
"""
cmd = ["git", "interpret-trailers", "--parse"]
proc: Git.AutoInterrupt = self.repo.git.execute(cmd, as_process=True, istream=PIPE) # type: ignore
trailer: str = proc.communicate(str(self.message).encode())[0].decode("utf8")
trailer = trailer.strip()

if not trailer:
return []

trailer_list = []
for t in trailer.split("\n"):
key, val = t.split(":", 1)
trailer_list.append((key.strip(), val.strip()))

return trailer_list

@property
def trailers_dict(self) -> Dict[str, List[str]]:
"""Get the trailers of the message as a dictionary

Git messages can contain trailer information that are similar to RFC 822
e-mail headers (see: https://git-scm.com/docs/git-interpret-trailers).
Expand All@@ -345,42 +410,35 @@ def trailers(self) -> Dict:
to extract the trailer information. The key value pairs are stripped of
leading and trailing whitespaces before they get saved into a dictionary.

Valid message with trailer:

.. code-block::
Valid message with trailer::

Subject line

some body information

another information

key1: value1
key1: value1.1
key1: value1.2
key2 : value 2 with inner spaces

dictionary will look like this:

.. code-block::
Returned dictionary will look like this::

{
"key1": "value1",
"key2": "value 2 with inner spaces"
"key1":["value1.1", "value1.2"],
"key2":["value 2 with inner spaces"],
}

:return: Dictionary containing whitespace stripped trailer information

:return:
Dictionary containing whitespace stripped trailer information.
Mapping trailer keys to a list of their corresponding values.
"""
d = {}
cmd = ["git", "interpret-trailers", "--parse"]
proc: Git.AutoInterrupt = self.repo.git.execute(cmd, as_process=True, istream=PIPE) # type: ignore
trailer: str = proc.communicate(str(self.message).encode())[0].decode()
if trailer.endswith("\n"):
trailer = trailer[0:-1]
if trailer != "":
for line in trailer.split("\n"):
key, value = line.split(":", 1)
d[key.strip()] = value.strip()
return d
d = defaultdict(list)
for key, val in self.trailers_list:
d[key].append(val)
return dict(d)

@classmethod
def _iter_from_process_or_stream(cls, repo: "Repo", proc_or_stream: Union[Popen, IO]) -> Iterator["Commit"]:
Expand Down
77 changes: 41 additions & 36 deletionstest/test_commit.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -494,52 +494,57 @@ def test_datetimes(self):

def test_trailers(self):
KEY_1 = "Hello"
VALUE_1 = "World"
VALUE_1_1 = "World"
VALUE_1_2 = "Another-World"
KEY_2 = "Key"
VALUE_2 = "Value with inner spaces"

# Check if KEY 1 & 2 with Value 1 & 2 is extracted from multiple msg variations
msgs = []
msgs.append(f"Subject\n\n{KEY_1}: {VALUE_1}\n{KEY_2}: {VALUE_2}\n")
msgs.append(f"Subject\n \nSome body of a function\n \n{KEY_1}: {VALUE_1}\n{KEY_2}: {VALUE_2}\n")
msgs.append(
f"Subject\n \nSome body of a function\n\nnon-key: non-value\n\n{KEY_1}: {VALUE_1}\n{KEY_2}: {VALUE_2}\n"
)
msgs.append(
f"Subject\n \nSome multiline\n body of a function\n\nnon-key: non-value\n\n{KEY_1}: {VALUE_1}\n{KEY_2} : {VALUE_2}\n"
)

# Check the following trailer example is extracted from multiple msg variations
TRAILER = f"{KEY_1}: {VALUE_1_1}\n{KEY_2}: {VALUE_2}\n{KEY_1}: {VALUE_1_2}"
msgs = [
f"Subject\n\n{TRAILER}\n",
f"Subject\n \nSome body of a function\n \n{TRAILER}\n",
f"Subject\n \nSome body of a function\n\nnon-key: non-value\n\n{TRAILER}\n",
(
# check when trailer has inconsistent whitespace
f"Subject\n \nSome multiline\n body of a function\n\nnon-key: non-value\n\n"
f"{KEY_1}:{VALUE_1_1}\n{KEY_2} : {VALUE_2}\n{KEY_1}: {VALUE_1_2}\n"
),
]
for msg in msgs:
commit = self.rorepo.commit("master")
commit = copy.copy(commit)
commit = copy.copy(self.rorepo.commit("master"))
commit.message = msg
assert KEY_1 in commit.trailers.keys()
assert KEY_2 in commit.trailers.keys()
assert commit.trailers[KEY_1] == VALUE_1
assert commit.trailers[KEY_2] == VALUE_2

# Check that trailer stays empty for multiple msg combinations
msgs = []
msgs.append(f"Subject\n")
msgs.append(f"Subject\n\nBody with some\nText\n")
msgs.append(f"Subject\n\nBody with\nText\n\nContinuation but\n doesn't contain colon\n")
msgs.append(f"Subject\n\nBody with\nText\n\nContinuation but\n only contains one :\n")
msgs.append(f"Subject\n\nBody with\nText\n\nKey: Value\nLine without colon\n")
msgs.append(f"Subject\n\nBody with\nText\n\nLine without colon\nKey: Value\n")
assert commit.trailers_list == [
(KEY_1, VALUE_1_1),
(KEY_2, VALUE_2),
(KEY_1, VALUE_1_2),
]
assert commit.trailers_dict == {
KEY_1: [VALUE_1_1, VALUE_1_2],
KEY_2: [VALUE_2],
}

# check that trailer stays empty for multiple msg combinations
msgs = [
f"Subject\n",
f"Subject\n\nBody with some\nText\n",
f"Subject\n\nBody with\nText\n\nContinuation but\n doesn't contain colon\n",
f"Subject\n\nBody with\nText\n\nContinuation but\n only contains one :\n",
f"Subject\n\nBody with\nText\n\nKey: Value\nLine without colon\n",
f"Subject\n\nBody with\nText\n\nLine without colon\nKey: Value\n",
]

for msg in msgs:
commit = self.rorepo.commit("master")
commit = copy.copy(commit)
commit = copy.copy(self.rorepo.commit("master"))
commit.message = msg
assert len(commit.trailers.keys()) == 0
assert commit.trailers_list == []
assert commit.trailers_dict == {}

# check that only the last key value paragraph is evaluated
commit = self.rorepo.commit("master")
commit = copy.copy(commit)
commit.message = f"Subject\n\nMultiline\nBody\n\n{KEY_1}: {VALUE_1}\n\n{KEY_2}: {VALUE_2}\n"
assert KEY_1 not in commit.trailers.keys()
assert KEY_2 in commit.trailers.keys()
assert commit.trailers[KEY_2] == VALUE_2
commit = copy.copy(self.rorepo.commit("master"))
commit.message = f"Subject\n\nMultiline\nBody\n\n{KEY_1}: {VALUE_1_1}\n\n{KEY_2}: {VALUE_2}\n"
assert commit.trailers_list == [(KEY_2, VALUE_2)]
assert commit.trailers_dict == {KEY_2: [VALUE_2]}

def test_commit_co_authors(self):
commit = copy.copy(self.rorepo.commit("4251bd5"))
Expand Down
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