feat(changelog): support splitting commits by lines

.github/fixtures/test-split-commits/cliff.toml

@@ -0,0 +1,31 @@
+[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://tera.netlify.app/docs/#introduction
+body = """
+{% if version %}\
+    ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{% 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
+"""
+# remove the leading and trailing whitespaces from the template
+trim = true
+# changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+
+[git]
+# process each line of a commit as an individual commit
+split_commits = true

.github/fixtures/test-split-commits/commit.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -e
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:08" git commit --allow-empty -m "Initial commit"
+GIT_COMMITTER_DATE="2022-04-06 01:25:09" git commit --allow-empty -m \
+"feat: add feature 1
+feat: add feature 2
+fix: fix feature 1"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:10" git commit --allow-empty -m \
+"chore: bump deps
+style: apply formatting
+fix: fix feature 2"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:11" git commit --allow-empty -m \
+"test: add initial tests
+test: add more tests
+test: update assert statements"
+
+git tag v0.1.0

.github/fixtures/test-split-commits/expected.md

@@ -0,0 +1,31 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.1.0] - 2022-04-05
+
+### Chore
+
+- Bump deps
+
+### Feat
+
+- Add feature 1
+- Add feature 2
+
+### Fix
+
+- Fix feature 1
+- Fix feature 2
+
+### Style
+
+- Apply formatting
+
+### Test
+
+- Add initial tests
+- Add more tests
+- Update assert statements
+
+<!-- generated by git-cliff -->

README.md

@@ -62,6 +62,7 @@
   - [git](#git)
     - [conventional_commits](#conventional_commits)
     - [filter_unconventional](#filter_unconventional)
+    - [split_commits](#split_commits)
     - [commit_preprocessors](#commit_preprocessors)
     - [commit_parsers](#commit_parsers)
     - [filter_commits](#filter_commits)
@@ -76,6 +77,7 @@
 - [Templating](#templating)
   - [Context](#context)
     - [Conventional Commits](#conventional-commits)
+      - [Footers](#footers)
       - [Breaking Changes](#breaking-changes)
     - [Non-Conventional Commits](#non-conventional-commits)
   - [Syntax](#syntax)
@@ -86,7 +88,7 @@
     - [Scoped (Sorted)](#scoped-sorted)
     - [Keep a Changelog](#keep-a-changelog)
     - [Unconventional](#unconventional)
-- [Similar Projects](#similar-projects)
+- [Similar/Related Projects](#similarrelated-projects)
 - [License](#license)
 - [Copyright](#copyright)
 
@@ -432,6 +434,7 @@ This section contains the parsing and git related configuration options.
 [git]
 conventional_commits = true
 filter_unconventional = true
+split_commits = false
 commit_parsers = [
     { message = "^feat", group = "Features"},
     { message = "^fix", group = "Bug Fixes"},
@@ -500,6 +503,27 @@ conventional_commits = false
 filter_unconventional = false
 ```
 
+#### split_commits
+
+> This flag violates "conventional commits". It should remain off by default if conventional commits is to be respected.
+
+If set to `true`, each line of a commit is processed individually, as if it were its own commit message. This may cause
+a commit to appear multiple times in a changelog, once for each match.
+
+```toml
+conventional_commits = true
+filter_unconventional = true
+split_commits = true
+commit_parsers = [
+    { message = "^feat", group = "Features"},
+]
+```
+
+With the configuration above, lines are parsed as conventional commits and unconventional lines are omitted.
+
+If `filter_unconventional = false`, every line will be processes as an unconventional commit, resulting in each line of
+a commit being treated as a changelog entry.
+
 #### commit_preprocessors
 
 An array of commit preprocessors for manipulating the commit messages before parsing/grouping them. These regex-based preprocessors can be used for removing or selecting certain parts of the commit message/body to be used in the following processes.

config/cliff.toml

@@ -33,6 +33,8 @@ footer = """
 conventional_commits = true
 # filter out the commits that are not conventional
 filter_unconventional = true
+# process each line of a commit as an individual commit
+split_commits = false
 # regex for preprocessing the commit messages
 commit_preprocessors = [
     { pattern = '\((\w+\s)?#([0-9]+)\)', replace = "([#${2}](https://github.com/orhun/git-cliff/issues/${2}))"},

examples/detailed.toml

@@ -42,6 +42,8 @@ footer = """
 conventional_commits = true
 # filter out the commits that are not conventional
 filter_unconventional = true
+# process each line of a commit as an individual commit
+split_commits = false
 # regex for parsing and grouping commits
 commit_parsers = [
     { message = "^feat", group = "Features"},

examples/keepachangelog.toml

@@ -36,6 +36,8 @@ footer = """
 conventional_commits = true
 # filter out the commits that are not conventional
 filter_unconventional = true
+# process each line of a commit as an individual commit
+split_commits = false
 # regex for parsing and grouping commits
 commit_parsers = [
     { message = "^.*: add", group = "Added"},

examples/scoped.toml

@@ -36,6 +36,8 @@ footer = """
 conventional_commits = true
 # filter out the commits that are not conventional
 filter_unconventional = true
+# process each line of a commit as an individual commit
+split_commits = false
 # regex for parsing and grouping commits
 commit_parsers = [
     { message = "^feat", group = "Features"},

examples/scopesorted.toml

@@ -48,6 +48,8 @@ footer = """
 conventional_commits = true
 # filter out the commits that are not conventional
 filter_unconventional = true
+# process each line of a commit as an individual commit
+split_commits = false
 # regex for parsing and grouping commits
 commit_parsers = [
     { message = "^feat", group = "Features"},

examples/unconventional.toml

@@ -33,6 +33,8 @@ footer = """
 conventional_commits = true
 # filter out the commits that are not conventional
 filter_unconventional = false
+# process each line of a commit as an individual commit
+split_commits = false
 # regex for parsing and grouping commits
 commit_parsers = [
     { message = "^feat", group = "Features"},

git-cliff-core/src/config.rs

@@ -42,26 +42,30 @@ pub struct GitConfig {
 	pub conventional_commits:  Option<bool>,
 	/// Whether to filter out unconventional commits.
 	pub filter_unconventional: Option<bool>,
+	/// Whether to split commits by line, processing each line as an individual
+	/// commit.
+	pub split_commits:         Option<bool>,
+
 	/// Git commit preprocessors.
-	pub commit_preprocessors:  Option<Vec<CommitPreprocessor>>,
+	pub commit_preprocessors: Option<Vec<CommitPreprocessor>>,
 	/// Git commit parsers.
-	pub commit_parsers:        Option<Vec<CommitParser>>,
+	pub commit_parsers:       Option<Vec<CommitParser>>,
 	/// Link parsers.
-	pub link_parsers:          Option<Vec<LinkParser>>,
+	pub link_parsers:         Option<Vec<LinkParser>>,
 	/// Whether to filter out commits.
-	pub filter_commits:        Option<bool>,
+	pub filter_commits:       Option<bool>,
 	/// Blob pattern for git tags.
-	pub tag_pattern:           Option<String>,
+	pub tag_pattern:          Option<String>,
 	#[serde(with = "serde_regex", default)]
 	/// Regex to skip matched tags.
-	pub skip_tags:             Option<Regex>,
+	pub skip_tags:            Option<Regex>,
 	#[serde(with = "serde_regex", default)]
 	/// Regex to ignore matched tags.
-	pub ignore_tags:           Option<Regex>,
+	pub ignore_tags:          Option<Regex>,
 	/// Whether to sort tags chronologically.
-	pub date_order:            Option<bool>,
+	pub date_order:           Option<bool>,
 	/// Sorting of the commits inside sections.
-	pub sort_commits:          Option<String>,
+	pub sort_commits:         Option<String>,
 }
 
 /// Parser for grouping commits.

git-cliff-core/tests/integration_test.rs

@@ -40,6 +40,7 @@ fn generate_changelog() -> Result<()> {
 	let git_config = GitConfig {
 		conventional_commits:  Some(true),
 		filter_unconventional: Some(true),
+		split_commits:         Some(false),
 		commit_preprocessors:  Some(vec![CommitPreprocessor {
 			pattern:         Regex::new(r#"\(fixes (#[1-9]+)\)"#).unwrap(),
 			replace:         Some(String::from("[closes Issue${1}]")),