feat(changelog): support generating changelog for different branches (#…

…808)

* feat: support generating change log for different branches

* check if the head commit is also a tag commit

* simplify implementation without requiring a branch

* remove unused import

* update test-topo-order fixture

* add comment for should_include_tag

* fix typo

* rename variable

* generate fixture considering timezone difference

* make --use-branch-tags optional for backward compatibility

* add missing field

* refactor: polish implementation

---------

Co-authored-by: Orhun Parmaksız <orhunparmaksiz@gmail.com>

git-cliff-core/src/changelog.rs

@@ -805,6 +805,7 @@ mod test {
 				skip_tags:                Regex::new("v3.*").ok(),
 				ignore_tags:              None,
 				count_tags:               None,
+				use_branch_tags:          Some(false),
 				topo_order:               Some(false),
 				sort_commits:             Some(String::from("oldest")),
 				link_parsers:             None,

git-cliff-core/src/config.rs

@@ -115,6 +115,8 @@ pub struct GitConfig {
 	/// Regex to count matched tags.
 	#[serde(with = "serde_regex", default)]
 	pub count_tags:               Option<Regex>,
+	/// Include only the tags that belong to the current branch.
+	pub use_branch_tags:          Option<bool>,
 	/// Whether to sort tags topologically.
 	pub topo_order:               Option<bool>,
 	/// Sorting of the commits inside sections.

git-cliff-core/src/repo.rs

@@ -310,16 +310,35 @@ impl Repository {
 		None
 	}
 
+	/// Decide whether to include tag
+	///
+	/// `head_commit` is the `latest` commit to generate changelog. It can be a
+	/// branch head or a detached head. `tag_commit` is a tagged commit. If the
+	/// commit is in the descendant graph of the head_commit or is the
+	/// head_commit itself, Changelog should include the tag.
+	fn should_include_tag(
+		&self,
+		head_commit: &Commit,
+		tag_commit: &Commit,
+	) -> Result<bool> {
+		Ok(self
+			.inner
+			.graph_descendant_of(head_commit.id(), tag_commit.id())? ||
+			head_commit.id() == tag_commit.id())
+	}
+
 	/// Parses and returns a commit-tag map.
 	///
 	/// It collects lightweight and annotated tags.
 	pub fn tags(
 		&self,
 		pattern: &Option<Regex>,
 		topo_order: bool,
+		use_branch_tags: bool,
 	) -> Result<IndexMap<String, Tag>> {
 		let mut tags: Vec<(Commit, Tag)> = Vec::new();
 		let tag_names = self.inner.tag_names(None)?;
+		let head_commit = self.inner.head()?.peel_to_commit()?;
 		for name in tag_names
 			.iter()
 			.flatten()
@@ -330,6 +349,12 @@ impl Repository {
 		{
 			let obj = self.inner.revparse_single(&name)?;
 			if let Ok(commit) = obj.clone().into_commit() {
+				if use_branch_tags &&
+					!self.should_include_tag(&head_commit, &commit)?
+				{
+					continue;
+				}
+
 				tags.push((commit, Tag {
 					name,
 					message: None,
@@ -340,6 +365,11 @@ impl Repository {
 					.ok()
 					.and_then(|target| target.into_commit().ok())
 				{
+					if use_branch_tags &&
+						!self.should_include_tag(&head_commit, &commit)?
+					{
+						continue;
+					}
 					tags.push((commit, Tag {
 						name:    tag.name().map(String::from).unwrap_or(name),
 						message: tag.message().map(|msg| {
@@ -468,15 +498,15 @@ mod test {
 	#[test]
 	fn get_latest_tag() -> Result<()> {
 		let repository = get_repository()?;
-		let tags = repository.tags(&None, false)?;
+		let tags = repository.tags(&None, false, false)?;
 		assert_eq!(get_last_tag()?, tags.last().expect("no tags found").1.name);
 		Ok(())
 	}
 
 	#[test]
 	fn git_tags() -> Result<()> {
 		let repository = get_repository()?;
-		let tags = repository.tags(&None, true)?;
+		let tags = repository.tags(&None, true, false)?;
 		assert_eq!(
 			tags.get("2b8b4d3535f29231e05c3572e919634b9af907b6")
 				.expect(
@@ -500,6 +530,7 @@ mod test {
 					.expect("the regex is not valid"),
 			),
 			true,
+			false,
 		)?;
 		assert_eq!(
 			tags.get("2b8b4d3535f29231e05c3572e919634b9af907b6")

git-cliff-core/tests/integration_test.rs

@@ -119,6 +119,7 @@ fn generate_changelog() -> Result<()> {
 		skip_tags:                None,
 		ignore_tags:              None,
 		count_tags:               None,
+		use_branch_tags:          None,
 		topo_order:               None,
 		sort_commits:             None,
 		link_parsers:             Some(vec![

git-cliff/src/args.rs

@@ -229,6 +229,9 @@ pub struct Opt {
 	/// Sorts the tags topologically.
 	#[arg(long, help_heading = Some("FLAGS"))]
 	pub topo_order:       bool,
+	/// Include only the tags that belong to the current branch.
+	#[arg(long, help_heading = Some("FLAGS"))]
+	pub use_branch_tags:  bool,
 	/// Disables the external command execution.
 	#[arg(long, help_heading = Some("FLAGS"))]
 	pub no_exec:          bool,

git-cliff/src/lib.rs

@@ -83,7 +83,11 @@ fn process_repository<'a>(
 	config: &mut Config,
 	args: &Opt,
 ) -> Result<Vec<Release<'a>>> {
-	let mut tags = repository.tags(&config.git.tag_pattern, args.topo_order)?;
+	let mut tags = repository.tags(
+		&config.git.tag_pattern,
+		args.topo_order,
+		args.use_branch_tags,
+	)?;
 	let skip_regex = config.git.skip_tags.as_ref();
 	let ignore_regex = config.git.ignore_tags.as_ref();
 	let count_tags = config.git.count_tags.as_ref();

website/docs/usage/args.md

@@ -11,16 +11,17 @@ git-cliff [FLAGS] [OPTIONS] [--] [RANGE]
 ## Flags
 
 ```
--h, --help            Prints help information
--V, --version         Prints version information
--v, --verbose...      Increases the logging verbosity
-    --bumped-version  Prints bumped version for unreleased changes
--l, --latest          Processes the commits starting from the latest tag
-    --current         Processes the commits that belong to the current tag
--u, --unreleased      Processes the commits that do not belong to a tag
-    --topo-order      Sorts the tags topologically
-    --no-exec         Disables the external command execution
--x, --context         Prints changelog context as JSON
+-h, --help             Prints help information
+-V, --version          Prints version information
+-v, --verbose...       Increases the logging verbosity
+    --bumped-version   Prints bumped version for unreleased changes
+-l, --latest           Processes the commits starting from the latest tag
+    --current          Processes the commits that belong to the current tag
+-u, --unreleased       Processes the commits that do not belong to a tag
+    --topo-order       Sorts the tags topologically
+    --use-branch-tags  Include only the tags that belong to the current branch
+    --no-exec          Disables the external command execution
+-x, --context          Prints changelog context as JSON
 ```
 
 ## Options

website/docs/usage/examples.md

@@ -45,6 +45,12 @@ git cliff v2.2.1..
 git cliff v0.1.0..HEAD
 ```
 
+Only include the tags from the current branch:
+
+```bash
+git cliff --use-branch-tags
+```
+
 Sort the commits inside sections:
 
 ```bash