fix: fix previous release references

.github/fixtures/test-keep-a-changelog-links/cliff.toml

@@ -0,0 +1,79 @@
+# configuration file for git-cliff (0.1.0)
+
+[changelog]
+# changelog header
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).\n
+"""
+# template for the changelog body
+# https://tera.netlify.app/docs/#introduction
+body = """
+{% if version %}\
+    {% if previous %}\
+      {% if previous.version %}\
+          ## [{{ version | trim_start_matches(pat="v") }}](https://github.com/dummy/dummy/compare/{{ previous.version }}...{{ version }}) - {{ timestamp | date(format="%Y-%m-%d") }}
+      {% else %}\
+          ## [{{ version | trim_start_matches(pat="v") }}](https://github.com/dummy/dummy/releases/tag/{{ version }}) - {{ timestamp | date(format="%Y-%m-%d") }}
+      {% endif %}\
+    {% endif %}\
+{% else %}\
+    {% if previous %}\
+      {% if previous.version %}\
+          ## [Unreleased](https://github.com/dummy/dummy/compare/{{ previous.version }}...HEAD)
+      {% else %}\
+          ## [Unreleased]
+      {% endif %}\
+    {% else %}\
+        ## [Unreleased]
+    {% endif %}\
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | upper_first }}
+    {% for commit in commits %}
+        - {{ commit.message | upper_first }}\
+    {% endfor %}
+{% endfor %}\n
+"""
+# remove the leading and trailing whitespace from the template
+trim = true
+# changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+
+[git]
+# parse the commits based on https://www.conventionalcommits.org
+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"},
+    { message = "^.*: support", group = "Added"},
+    { message = "^.*: remove", group = "Removed"},
+    { message = "^.*: delete", group = "Removed"},
+    { message = "^test", group = "Fixed"},
+    { message = "^fix", group = "Fixed"},
+    { message = "^.*: fix", group = "Fixed"},
+    { message = "^.*", group = "Changed"},
+]
+# protect breaking changes from being skipped due to matching a skipping commit_parser
+protect_breaking_commits = false
+# filter out the commits that are not matched by commit parsers
+filter_commits = true
+# glob pattern for matching git tags
+tag_pattern = "v[0-9]*"
+# regex for skipping tags
+skip_tags = "v0.1.0-beta.1"
+# regex for ignoring tags
+ignore_tags = ""
+# sort the tags topologically
+topo_order = false
+# sort the commits inside sections by oldest/newest order
+sort_commits = "oldest"

.github/fixtures/test-keep-a-changelog-links/commit.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -e
+
+GIT_COMMITTER_DATE="2021-01-23 01:23:45" git commit --allow-empty -m "feat: add feature 1"
+git tag v0.1.0
+
+GIT_COMMITTER_DATE="2021-01-24 01:23:46" git commit --allow-empty -m "feat: add feature 2"
+git tag v0.2.0
+
+GIT_COMMITTER_DATE="2021-01-25 01:23:47" git commit --allow-empty -m "fix: fix feature 1"

.github/fixtures/test-keep-a-changelog-links/expected.md

@@ -0,0 +1,26 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased](https://github.com/dummy/dummy/compare/v0.2.0...develop)
+
+### Fixed
+
+- Fix feature 1
+
+## [v0.2.0](https://github.com/dummy/dummy/compare/v0.1.0...v0.2.0) - 2021-01-24
+
+### Added
+
+- Add feature 2
+
+## [v0.1.0](https://https://github.com/dummy/dummy/releases/tag/v0.1.0) - 2021-01-23
+
+### Added
+
+- Add feature 1
+
+<!-- generated by git-cliff -->

.github/workflows/test-fixtures.yml

@@ -31,6 +31,7 @@ jobs:
           - fixtures-name: test-limit-commits
           - fixtures-name: test-skip-breaking-changes
           - fixtures-name: test-split-commits
+          - fixtures-name: test-keep-a-changelog-links
     steps:
       - name: Checkout
         uses: actions/checkout@v3

git-cliff/src/lib.rs

@@ -196,6 +196,11 @@ fn process_repository<'a>(
 		}
 	}
 
+    if release_index > 1 {
+        previous_release.previous = None;
+        releases[release_index].previous = Some(Box::new(previous_release));
+    }
+
 	// Add custom commit messages to the latest release.
 	if let Some(custom_commits) = &args.with_commit {
 		if let Some(latest_release) = releases.iter_mut().last() {
@@ -209,8 +214,9 @@ fn process_repository<'a>(
 
 	// Set the previous release if needed.
 	if args.latest || args.unreleased {
+        let sub = if args.latest { 2 } else { 1 };
 		if let Some((commit_id, version)) =
-			tags.len().checked_sub(2).and_then(|v| tags.get_index(v))
+			tags.len().checked_sub(sub).and_then(|v| tags.get_index(v))
 		{
 			let previous_release = Release {
 				commit_id: Some(commit_id.to_string()),