feature(config): improve support for backwards compatability

.github/actions/run-fixtures-test/action.yml

@@ -1,54 +1,74 @@
-name: Run a fixtures test
-description: Run a fixtures test
-
-inputs:
-  fixtures-dir:
-    description: Path to the fixtures directory
-    required: true
-  command:
-    description: The git-cliff command to run
-    required: false
-    default: ""
-  date-format:
-    description: The date format to use
-    required: false
-    default: "%Y-%m-%d"
-
-runs:
-  using: composite
-  steps:
-    - name: Install toolchain
-      uses: dtolnay/rust-toolchain@nightly
-
-    - name: Install git-cliff
-      run: cargo install --path git-cliff/
-      shell: bash
-
-    - name: Set git config
-      run: |
-        git config --global user.name "github-actions[bot]"
-        git config --global user.email "github-actions[bot]@users.noreply.github.com"
-      shell: bash
-
-    - name: Create commits and tags
-      working-directory: ${{ inputs.fixtures-dir }}
-      run: |
-        git init
-        ./commit.sh
-      shell: bash
-
-    - name: Generate a changelog
-      working-directory: ${{ inputs.fixtures-dir }}
-      run: git cliff --config cliff.toml ${{ inputs.command }} > output.md
-      shell: bash
-
-    - name: Compare the output with the expected output
-      working-directory: ${{ inputs.fixtures-dir }}
-      env:
-        IN_DATE_FORMAT: ${{ inputs.date-format }}
-      run: |
-        cat output.md
-        current_date=$(date +"$IN_DATE_FORMAT")
-        sed -i "s/<<DATE>>/$current_date/g" expected.md
-        diff --strip-trailing-cr output.md expected.md
-      shell: bash
+name: Run a fixtures test
+description: Run a fixtures test
+
+inputs:
+  fixtures-dir:
+    description: Path to the fixtures directory
+    required: true
+  command:
+    description: The git-cliff command to run
+    required: false
+    default: ""
+  date-format:
+    description: The date format to use
+    required: false
+    default: "%Y-%m-%d"
+
+runs:
+  using: composite
+  steps:
+    - name: Install toolchain
+      uses: dtolnay/rust-toolchain@nightly
+
+    - name: Install git-cliff
+      run: cargo install --path git-cliff/
+      shell: bash
+
+    - name: Set git config
+      run: |
+        git config --global user.name "github-actions[bot]"
+        git config --global user.email "github-actions[bot]@users.noreply.github.com"
+      shell: bash
+
+    - name: Create commits and tags
+      working-directory: ${{ inputs.fixtures-dir }}
+      run: |
+        git init
+        ./commit.sh
+      shell: bash
+
+    - name: Generate a changelog
+      working-directory: ${{ inputs.fixtures-dir }}
+      run: git cliff --config cliff.toml ${{ inputs.command }} > output.md
+      shell: bash
+
+    - name: Compare the output with the expected output
+      working-directory: ${{ inputs.fixtures-dir }}
+      env:
+        IN_DATE_FORMAT: ${{ inputs.date-format }}
+      run: |
+        cat output.md
+        current_date=$(date +"$IN_DATE_FORMAT")
+        sed -i "s/<<DATE>>/$current_date/g" expected.md
+        diff --strip-trailing-cr output.md expected.md
+      shell: bash
+
+    # test backwards compatibility using v1 confiuration
+
+    - name: Generate a chanlog using v1 configuration
+      if: ${{ hashFiles(format('{0}/cliff.v1.toml', inputs.fixtures-dir)) }}
+      working-directory: ${{ inputs.fixtures-dir }}
+      run: git-cliff --config cliff.v1.toml --config-version 1 ${{ inputs.command }} > output.md
+      shell: bash
+
+    - name: Compare the v1 configuration output with the expected output
+      if: ${{ hashFiles(format('{0}/cliff.v1.toml', inputs.fixtures-dir)) }}
+      working-directory: ${{ inputs.fixtures-dir }}
+      env:
+        IN_DATE_FORMAT: ${{ inputs.date-format }}
+      run: |
+        cat output.md
+        current_date=$(date +"$IN_DATE_FORMAT")
+        sed -i "s/<<DATE>>/$current_date/g" expected.md
+        diff --strip-trailing-cr output.md expected.md
+      shell: bash

.github/fixtures/test-bump-version/cliff.v1.toml

@@ -0,0 +1,27 @@
+[changelog]
+# changelog header
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file.\n
+"""
+# template for the changelog body
+# https://keats.github.io/tera/docs/#introduction
+body = """
+{% if version %}\
+    ## [{{ version | trim_start_matches(pat="v") }}]
+{% else %}\
+    ## [unreleased]
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | upper_first }}
+    {% for commit in commits %}
+        - {% if commit.breaking %}[**breaking**] {% endif %}{{ commit.message | upper_first }}\
+    {% endfor %}
+{% endfor %}\n
+"""
+# template for the changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+# remove the leading and trailing whitespace from the templates
+trim = true

git-cliff-core/src/changelog.rs

@@ -1,5 +1,9 @@
 use crate::commit::Commit;
-use crate::config::models_v2::Config;
+use crate::config::models_v2::{
+	ChangelogConfig,
+	CommitConfig,
+	Config,
+};
 use crate::error::Result;
 #[cfg(feature = "github")]
 use crate::github::{
@@ -60,9 +64,10 @@ impl<'a> Changelog<'a> {
 	/// Processes a single commit and returns/logs the result.
 	fn process_commit(
 		commit: Commit<'a>,
-		git_config: &GitConfig,
+		changelog_config: &ChangelogConfig,
+		commit_config: &CommitConfig,
 	) -> Option<Commit<'a>> {
-		match commit.process(git_config) {
+		match commit.process(changelog_config, commit_config) {
 			Ok(commit) => Some(commit),
 			Err(e) => {
 				trace!(
@@ -85,7 +90,13 @@ impl<'a> Changelog<'a> {
 				.commits
 				.iter()
 				.cloned()
-				.filter_map(|commit| Self::process_commit(commit, &self.config.git))
+				.filter_map(|commit| {
+					Self::process_commit(
+						commit,
+						&self.config.changelog,
+						&self.config.commit,
+					)
+				})
 				.flat_map(|commit| {
 					if self.config.commit.split_by_newline.unwrap_or(false) {
 						commit
@@ -94,7 +105,11 @@ impl<'a> Changelog<'a> {
 							.flat_map(|line| {
 								let mut c = commit.clone();
 								c.message = line.to_string();
-								Self::process_commit(c, &self.config.git)
+								Self::process_commit(
+									c,
+									&self.config.changelog,
+									&self.config.commit,
+								)
 							})
 							.collect()
 					} else {

git-cliff-core/src/commit.rs

@@ -190,9 +190,9 @@ impl Commit<'_> {
 		if let Some(preprocessors) = &commit_config.message_preprocessors {
 			commit = commit.preprocess(preprocessors)?;
 		}
-		if config.parse_conventional_commits.unwrap_or(true) {
-			if config.exclude_unconventional_commits.unwrap_or(true) &&
-				!config.split_commits.unwrap_or(false)
+		if commit_config.parse_conventional_commits.unwrap_or(true) {
+			if commit_config.exclude_unconventional_commits.unwrap_or(true) &&
+				!commit_config.split_by_newline.unwrap_or(false)
 			{
 				commit = commit.into_conventional()?;
 			} else if let Ok(conv_commit) = commit.clone().into_conventional() {

git-cliff-core/src/config/embed.rs

@@ -0,0 +1,103 @@
+use super::DEFAULT_CONFIG_FILENAME;
+use crate::error::{
+	Error,
+	Result,
+};
+use regex::{
+	Regex,
+	RegexBuilder,
+};
+use rust_embed::RustEmbed;
+use std::fs;
+use std::{
+	path::PathBuf,
+	str,
+};
+
+/// Manifest file information and regex for matching contents.
+#[derive(Debug)]
+struct ManifestInfo {
+	/// Path of the manifest.
+	path:  PathBuf,
+	/// Regular expression for matching metadata in the manifest.
+	regex: Regex,
+}
+
+lazy_static::lazy_static! {
+	/// Array containing manifest information for Rust and Python projects.
+	static ref MANIFEST_INFO: Vec<ManifestInfo> = vec![
+		ManifestInfo {
+			path: PathBuf::from("Cargo.toml"),
+			regex: RegexBuilder::new(
+				r"^\[(?:workspace|package)\.metadata\.git\-cliff\.",
+			)
+			.multi_line(true)
+			.build()
+			.expect("failed to build regex"),
+		},
+		ManifestInfo {
+			path: PathBuf::from("pyproject.toml"),
+			regex: RegexBuilder::new(r"^\[(?:tool)\.git\-cliff\.")
+				.multi_line(true)
+				.build()
+				.expect("failed to build regex"),
+		},
+	];
+
+}
+
+/// Reads the config file contents from project manifest (e.g. Cargo.toml,
+/// pyproject.toml)
+pub fn read_from_manifest() -> Result<Option<String>> {
+	for info in (*MANIFEST_INFO).iter() {
+		if info.path.exists() {
+			let contents = fs::read_to_string(&info.path)?;
+			if info.regex.is_match(&contents) {
+				return Ok(Some(info.regex.replace_all(&contents, "[").to_string()));
+			}
+		}
+	}
+	Ok(None)
+}
+
+/// Default configuration file embedder/extractor.
+///
+/// Embeds `config/`[`DEFAULT_CONFIG`] into the binary.
+///
+/// [`DEFAULT_CONFIG`]: crate::DEFAULT_CONFIG
+#[derive(Debug, RustEmbed)]
+#[folder = "../config/"]
+pub struct EmbeddedConfig;
+
+impl EmbeddedConfig {
+	/// Extracts the embedded content.
+	pub fn get_config_str() -> Result<String> {
+		match Self::get(DEFAULT_CONFIG_FILENAME) {
+			Some(v) => Ok(str::from_utf8(&v.data)?.to_string()),
+			None => Err(Error::EmbeddedError(String::from(
+				"Embedded config not found",
+			))),
+		}
+	}
+}
+
+/// Built-in configuration file embedder/extractor.
+///
+/// Embeds the files under `/examples/` into the binary.
+#[derive(RustEmbed)]
+#[folder = "../examples/"]
+pub struct BuiltinConfig;
+
+impl BuiltinConfig {
+	/// Extracts the embedded content.
+	pub fn get_config_str(mut name: String) -> Result<(String, String)> {
+		if !name.ends_with(".toml") {
+			name = format!("{name}.toml");
+		}
+		let contents = match Self::get(&name) {
+			Some(v) => Ok(str::from_utf8(&v.data)?.to_string()),
+			None => Err(Error::EmbeddedError(format!("config {} not found", name,))),
+		}?;
+		Ok((contents, name))
+	}
+}

git-cliff-core/src/config/mod.rs

@@ -1,5 +1,9 @@
+/// Embedded file handler.
+pub mod embed;
 /// Provide a command to migrate from old to new configuration.
 pub mod migrate;
+/// Base confih models for git-cliff.
+pub mod models_base;
 /// Deprecated Config models for git-cliff.
 pub mod models_v1;
 /// Current Config models for git-cliff.
@@ -9,3 +13,8 @@ pub mod parsing;
 /// Tests for git-cliff Config.
 #[cfg(test)]
 pub mod test;
+
+/// Default configuration file.
+pub const DEFAULT_CONFIG_FILENAME: &str = "cliff.toml";
+/// Default configuration version.
+pub const DEFAULT_CONFIG_VERSION: i64 = 2;

git-cliff-core/src/config/models_base.rs

@@ -0,0 +1,11 @@
+use serde::{
+	Deserialize,
+	Serialize,
+};
+
+/// Meta section of the configuration file.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct MetaConfig {
+	/// The version of the config schema.
+	pub version: Option<i64>,
+}

git-cliff-core/src/config/test.rs

@@ -2,7 +2,10 @@ use super::models_v2::{
 	Config,
 	Remote,
 };
-use crate::config::parsing;
+use crate::config::{
+	parsing,
+	DEFAULT_CONFIG_FILENAME,
+};
 use crate::error::Result;
 use std::env;
 use std::path::PathBuf;
@@ -14,7 +17,7 @@ fn parse_config() -> Result<()> {
 		.expect("parent directory not found")
 		.to_path_buf()
 		.join("config")
-		.join(crate::DEFAULT_CONFIG_FILENAME);
+		.join(DEFAULT_CONFIG_FILENAME);
 
 	const FOOTER_VALUE: &str = "test";
 	const RELEASE_TAGS_PATTERN_VALUE: &str = ".*[0-9].*";