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perf: improve git history processing for changelog generation#972

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83 changes: 44 additions & 39 deletionssemantic_release/changelog/release_history.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -41,6 +41,13 @@ def from_git_history(
unreleased:dict[str,list[ParseResult]]=defaultdict(list)
released:dict[Version,Release]= {}

# Performance optimization: create a mapping of tag sha to version
# so we can quickly look up the version for a given commit based on sha
tag_sha_2_version_lookup= {
tag.commit.hexsha: (tag,version)
fortag,versioninall_git_tags_and_versions
}

# Strategy:
# Loop through commits in history, parsing as we go.
# Add these commits to `unreleased` as a key-value mapping
Expand All@@ -54,7 +61,7 @@ def from_git_history(
is_commit_released=False
the_version:Version|None=None

forcommitinrepo.iter_commits():
forcommitinrepo.iter_commits("HEAD",topo_order=True):
# mypy will be happy if we make this an explicit string
commit_message=str(commit.message)

Expand All@@ -64,46 +71,44 @@ def from_git_history(
)
log.debug("commit has type %s",commit_type)

fortag,versioninall_git_tags_and_versions:
iftag.commit==commit:
# we have found the latest commit introduced by this tag
# so we create a new Release entry
log.debug("found commit %s for tag %s",commit.hexsha,tag.name)
is_commit_released=True
the_version=version

# tag.object is a Commit if the tag is lightweight, otherwise
# it is a TagObject with additional metadata about the tag
ifisinstance(tag.object,TagObject):
tagger=tag.object.tagger
committer=tag.object.tagger.committer()
_tz=timezone(
timedelta(seconds=-1*tag.object.tagger_tz_offset)
)
tagged_date=datetime.fromtimestamp(
tag.object.tagged_date,tz=_tz
)
else:
# For some reason, sometimes tag.object is a Commit
tagger=tag.object.author
committer=tag.object.author
_tz=timezone(
timedelta(seconds=-1*tag.object.author_tz_offset)
)
tagged_date=datetime.fromtimestamp(
tag.object.committed_date,tz=_tz
)

release=Release(
tagger=tagger,
committer=committer,
tagged_date=tagged_date,
elements=defaultdict(list),
version=the_version,
log.debug("checking if commit %s matches any tags",commit.hexsha)
t_v=tag_sha_2_version_lookup.get(commit.hexsha,None)

ift_visNone:
log.debug("no tags correspond to commit %s",commit.hexsha)
else:
# Unpack the tuple (overriding the current version)
tag,the_version=t_v
# we have found the latest commit introduced by this tag
# so we create a new Release entry
log.debug("found commit %s for tag %s",commit.hexsha,tag.name)
is_commit_released=True

# tag.object is a Commit if the tag is lightweight, otherwise
# it is a TagObject with additional metadata about the tag
ifisinstance(tag.object,TagObject):
tagger=tag.object.tagger
committer=tag.object.tagger.committer()
_tz=timezone(timedelta(seconds=-1*tag.object.tagger_tz_offset))
tagged_date=datetime.fromtimestamp(tag.object.tagged_date,tz=_tz)
else:
# For some reason, sometimes tag.object is a Commit
tagger=tag.object.author
committer=tag.object.author
_tz=timezone(timedelta(seconds=-1*tag.object.author_tz_offset))
tagged_date=datetime.fromtimestamp(
tag.object.committed_date,tz=_tz
)

released.setdefault(the_version,release)
break
release=Release(
tagger=tagger,
committer=committer,
tagged_date=tagged_date,
elements=defaultdict(list),
version=the_version,
)

released.setdefault(the_version,release)

ifany(pat.match(commit_message)forpatinexclude_commit_patterns):
log.debug(
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