feat(config): support placing configuration inside pyproject.toml (#147)

README.md

@@ -76,6 +76,7 @@
     - [link_parsers](#link_parsers)
 - [Project Integration](#project-integration)
   - [Rust](#rust)
+  - [Python](#python)
 - [Templating](#templating)
   - [Context](#context)
     - [Conventional Commits](#conventional-commits)
@@ -721,6 +722,28 @@ filter_commits = false
 
 For Cargo workspaces, [`workspace.metadata`](https://doc.rust-lang.org/cargo/reference/workspaces.html#the-workspacemetadata-table) table can be used. (e.g. `[workspace.metadata.git-cliff.<section>]`)
 
+### Python
+
+For Python projects, **git-cliff** can be configured in `pyproject.toml` via the [tool table](https://peps.python.org/pep-0518/#tool-table). To do this, simply replace the available configuration sections with `[tool.git-cliff.<section>]` and place them inside `pyproject.toml`. For example:
+
+```toml
+name = "..."
+
+[project]
+dependencies = []
+
+[tool.git-cliff.changelog]
+header = "All notable changes to this project will be documented in this file."
+body = "..."
+footer = "<!-- generated by git-cliff -->"
+# see [changelog] section for more keys
+[tool.git-cliff.git]
+conventional_commits = true
+commit_parsers = []
+filter_commits = false
+# see [git] section for more keys
+```
+
 ## Templating
 
 A template is a text where variables and expressions get replaced with values when it is rendered.

git-cliff-core/src/config.rs

@@ -11,6 +11,9 @@ use std::path::Path;
 const CARGO_METADATA_REGEX: &str =
 	r"^\[(?:workspace|package)\.metadata\.git\-cliff\.";
 
+/// Regex for matching the metadata in pyproject.toml
+const PYPROJECT_METADATA_REGEX: &str = r"^\[(?:tool)\.git\-cliff\.";
+
 /// Configuration values.
 #[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
 pub struct Config {
@@ -119,11 +122,19 @@ pub struct LinkParser {
 impl Config {
 	/// Parses the config file and returns the values.
 	pub fn parse(path: &Path) -> Result<Config> {
-		let config_builder = if path.file_name() == Some(OsStr::new("Cargo.toml")) {
+		let config_builder = if path.file_name() == Some(OsStr::new("Cargo.toml")) ||
+			path.file_name() == Some(OsStr::new("pyproject.toml"))
+		{
 			let contents = fs::read_to_string(path)?;
-			let metadata_regex = RegexBuilder::new(CARGO_METADATA_REGEX)
-				.multi_line(true)
-				.build()?;
+			let metadata_regex = RegexBuilder::new(
+				if path.file_name() == Some(OsStr::new("Cargo.toml")) {
+					CARGO_METADATA_REGEX
+				} else {
+					PYPROJECT_METADATA_REGEX
+				},
+			)
+			.multi_line(true)
+			.build()?;
 			let contents = metadata_regex.replace_all(&contents, "[");
 			config::Config::builder().add_source(config::File::from_str(
 				&contents,