feat(changelog): support parsing commits by footer

.github/fixtures/test-footer-filter/cliff.toml

@@ -0,0 +1,39 @@
+[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") }}] - {{ 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 %}
+        - {{ 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]
+# regex for parsing and grouping commits
+commit_parsers = [
+    { message = "^feat", group = "Features", default_scope = "app" },
+    { message = "^fix", group = "Bug Fixes", scope = "cli" },
+    # Accept both separators, ": " and ":".
+    # Conventional commits require the separator to be ": ", but the reference implementation of the
+    # conventional commits parser currently does not adhere to the specification. See also:
+    # https://github.com/conventional-commits/parser/issues/47
+    { footer = "^changelog: ?ignore", skip = true },
+]

.github/fixtures/test-footer-filter/commit.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -e
+
+GIT_COMMITTER_DATE="2022-04-06 00:00:00" git commit --allow-empty -m "Initial commit"
+GIT_COMMITTER_DATE="2022-04-06 00:10:00" git commit --allow-empty -m "feat: add feature 1"
+git tag v0.1.0
+GIT_COMMITTER_DATE="2022-04-06 01:00:00" git commit --allow-empty -m "refactor: change feature 1" -m "BREAKING CHANGE: feature 1 is now different"
+GIT_COMMITTER_DATE="2022-04-06 01:10:00" git commit --allow-empty -m "chore: upgrade dependencies" -m "changelog: ignore"
+git tag v0.2.0
+GIT_COMMITTER_DATE="2022-04-06 02:00:00" git commit --allow-empty -m "test: add tests" -m "footer: some more info"
+GIT_COMMITTER_DATE="2022-04-06 02:10:00" git commit --allow-empty -m "test: add more tests" -m "changelog: ignore"

.github/fixtures/test-footer-filter/expected.md

@@ -0,0 +1,23 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [unreleased]
+
+### Test
+
+- Add tests
+
+## [0.2.0] - 2022-04-06
+
+### Refactor
+
+- Change feature 1
+
+## [0.1.0] - 2022-04-06
+
+### Features
+
+- Add feature 1
+
+<!-- generated by git-cliff -->

git-cliff-core/src/changelog.rs

@@ -632,6 +632,7 @@ mod test {
 						sha:           Some(String::from("tea")),
 						message:       None,
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("I love tea")),
 						default_scope: None,
 						scope:         None,
@@ -643,6 +644,7 @@ mod test {
 						sha:           Some(String::from("coffee")),
 						message:       None,
 						body:          None,
+						footer:        None,
 						group:         None,
 						default_scope: None,
 						scope:         None,
@@ -654,6 +656,7 @@ mod test {
 						sha:           Some(String::from("coffee2")),
 						message:       None,
 						body:          None,
+						footer:        None,
 						group:         None,
 						default_scope: None,
 						scope:         None,
@@ -665,6 +668,7 @@ mod test {
 						sha:           None,
 						message:       Regex::new(r".*merge.*").ok(),
 						body:          None,
+						footer:        None,
 						group:         None,
 						default_scope: None,
 						scope:         None,
@@ -676,6 +680,7 @@ mod test {
 						sha:           None,
 						message:       Regex::new("feat*").ok(),
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("New features")),
 						default_scope: Some(String::from("other")),
 						scope:         None,
@@ -687,6 +692,7 @@ mod test {
 						sha:           None,
 						message:       Regex::new("^fix*").ok(),
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("Bug Fixes")),
 						default_scope: None,
 						scope:         None,
@@ -698,6 +704,7 @@ mod test {
 						sha:           None,
 						message:       Regex::new("doc:").ok(),
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("Documentation")),
 						default_scope: None,
 						scope:         Some(String::from("documentation")),
@@ -709,6 +716,7 @@ mod test {
 						sha:           None,
 						message:       Regex::new("docs:").ok(),
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("Documentation")),
 						default_scope: None,
 						scope:         Some(String::from("documentation")),
@@ -720,17 +728,31 @@ mod test {
 						sha:           None,
 						message:       Regex::new(r"match\((.*)\):.*").ok(),
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("Matched ($1)")),
 						default_scope: None,
 						scope:         None,
 						skip:          None,
 						field:         None,
 						pattern:       None,
 					},
+					CommitParser {
+						sha:           None,
+						message:       None,
+						body:          None,
+						footer:        Regex::new("Footer:.*").ok(),
+						group:         Some(String::from("Footer")),
+						default_scope: None,
+						scope:         Some(String::from("footer")),
+						skip:          None,
+						field:         None,
+						pattern:       None,
+					},
 					CommitParser {
 						sha:           None,
 						message:       Regex::new(".*").ok(),
 						body:          None,
+						footer:        None,
 						group:         Some(String::from("Other")),
 						default_scope: Some(String::from("other")),
 						scope:         None,
@@ -832,6 +854,10 @@ mod test {
 					String::from("coffee"),
 					String::from("revert(app): skip this commit"),
 				),
+				Commit::new(
+					String::from("footer"),
+					String::from("misc: use footer\n\nFooter: footer text"),
+				),
 			],
 			commit_id: Some(String::from("0bc123")),
 			timestamp: 50000000,
@@ -957,6 +983,10 @@ mod test {
 			- update docs
 			- add some documentation
 
+			### Footer
+			#### footer
+			- use footer
+
 			### I love tea
 			#### app
 			- damn right
@@ -998,6 +1028,13 @@ mod test {
 		config.git.split_commits = Some(true);
 		config.git.filter_unconventional = Some(false);
 		config.git.protect_breaking_commits = Some(true);
+
+		if let Some(parsers) = config.git.commit_parsers.as_mut() {
+			for parser in parsers.iter_mut().filter(|p| p.footer.is_some()) {
+				parser.skip = Some(true)
+			}
+		}
+
 		releases[0].commits.push(Commit::new(
 			String::from("0bc123"),
 			String::from(
@@ -1164,6 +1201,10 @@ chore(deps): fix broken deps
     - update docs
     - add some documentation
 
+    ### Footer
+    #### footer
+    - use footer
+
     ### I love tea
     #### app
     - damn right

git-cliff-core/src/commit.rs

@@ -277,6 +277,13 @@ impl Commit<'_> {
 			if let Some(body_regex) = parser.body.as_ref() {
 				regex_checks.push((body_regex, body.clone().unwrap_or_default()))
 			}
+			if let (Some(footer_regex), Some(footers)) = (
+				parser.footer.as_ref(),
+				self.conv.as_ref().map(|v| v.footers()),
+			) {
+				regex_checks
+					.extend(footers.iter().map(|f| (footer_regex, f.to_string())));
+			}
 			if let (Some(field_name), Some(pattern_regex)) =
 				(parser.field.as_ref(), parser.pattern.as_ref())
 			{
@@ -483,6 +490,7 @@ mod test {
 				sha:           None,
 				message:       Regex::new("test*").ok(),
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("test_group")),
 				default_scope: Some(String::from("test_scope")),
 				scope:         None,
@@ -656,6 +664,7 @@ mod test {
 				sha:           None,
 				message:       None,
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("Test group")),
 				default_scope: None,
 				scope:         None,
@@ -684,6 +693,7 @@ mod test {
 				)),
 				message:       None,
 				body:          None,
+				footer:        None,
 				group:         None,
 				default_scope: None,
 				scope:         None,
@@ -703,6 +713,7 @@ mod test {
 				)),
 				message:       None,
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("Test group")),
 				default_scope: None,
 				scope:         None,

git-cliff-core/src/config.rs

@@ -213,6 +213,9 @@ pub struct CommitParser {
 	/// Regex for matching the commit body.
 	#[serde(with = "serde_regex", default)]
 	pub body:          Option<Regex>,
+	/// Regex for matching the commit footer.
+	#[serde(with = "serde_regex", default)]
+	pub footer:        Option<Regex>,
 	/// Group of the commit.
 	pub group:         Option<String>,
 	/// Default scope of the commit.

git-cliff-core/tests/integration_test.rs

@@ -56,6 +56,7 @@ fn generate_changelog() -> Result<()> {
 				sha:           Some(String::from("coffee")),
 				message:       None,
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("I love coffee")),
 				default_scope: None,
 				scope:         None,
@@ -67,6 +68,7 @@ fn generate_changelog() -> Result<()> {
 				sha:           None,
 				message:       Regex::new("^feat").ok(),
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("shiny features")),
 				default_scope: None,
 				scope:         None,
@@ -78,6 +80,7 @@ fn generate_changelog() -> Result<()> {
 				sha:           None,
 				message:       Regex::new("^fix").ok(),
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("fix bugs")),
 				default_scope: None,
 				scope:         None,
@@ -89,6 +92,7 @@ fn generate_changelog() -> Result<()> {
 				sha:           None,
 				message:       Regex::new("^test").ok(),
 				body:          None,
+				footer:        None,
 				group:         None,
 				default_scope: None,
 				scope:         Some(String::from("tests")),
@@ -100,6 +104,7 @@ fn generate_changelog() -> Result<()> {
 				sha:           None,
 				message:       None,
 				body:          None,
+				footer:        None,
 				group:         Some(String::from("docs")),
 				default_scope: None,
 				scope:         None,

website/docs/configuration/git.md

@@ -146,6 +146,10 @@ Examples:
   - Group the commit as "Features" if the commit message (description) starts with "feat".
 - `{ body = ".*security", group = "Security" }`
   - Group the commit as "Security" if the commit body contains "security".
+    <!-- Conventional commits parser is out of sync with spec, parsing only separator ":", not ": "; see: -->
+    <!-- https://github.com/conventional-commits/parser/issues/47 -->
+- `{ footer = "^changelog: ?ignore", skip = true }`
+  - Skip processing the commit if the commit footer contains "changelog: ignore".
 - `{ message = '^fix\((.*)\)', group = 'Fix (${1})' }`
   - Use the matched scope value from the commit message in the group name.
 - `{ message = ".*deprecated", body = ".*deprecated", group = "Deprecation" }`