refactor(config): initialize config structs with default values (#1090)

* refactor: default to embeded config

* docs: add comment about config source order

* fix(fixtures): adapt existing fixtures for new default configuration

* refactor(config): remove redundant default configuration values from fixtures

---------

Co-authored-by: Orhun Parmaksız <[email protected]>

Author: Cyclonit

.github/fixtures/new-fixture-template/cliff.toml

@@ -2,12 +2,6 @@
 # https://git-cliff.org/docs/configuration
 
 [changelog]
-# A Tera template to be rendered as the changelog's header.
-# See https://keats.github.io/tera/docs/#introduction
-header = """
-# Changelog\n
-All notable changes to this project will be documented in this file.\n
-"""
 # A Tera template to be rendered for each release in the changelog.
 # See https://keats.github.io/tera/docs/#introduction
 body = """
@@ -23,13 +17,6 @@ body = """
     {% endfor %}
 {% endfor %}\n
 """
-# A Tera template to be rendered as the changelog's footer.
-# See https://keats.github.io/tera/docs/#introduction
-footer = """
-<!-- generated by git-cliff -->
-"""
-# Remove leading and trailing whitespaces from the changelog's body.
-trim = true
 
 [git]
 # An array of regex based parsers for extracting data from the commit message.

.github/fixtures/test-always-render-unreleased/cliff.toml

@@ -1,9 +1,4 @@
 [changelog]
-# template for the changelog footer
-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 = """
@@ -23,11 +18,6 @@ No significant changes.
 {% endfor %}
 {%- endif %}
 """
-# template for the changelog footer
-footer = """
-<!-- generated by git-cliff -->
-"""
-# remove the leading and trailing whitespace from the templates
-trim = true
+
 # render body even when there are no releases to process
 render_always = true

.github/fixtures/test-always-render/cliff.toml

@@ -1,9 +1,4 @@
 [changelog]
-# template for the changelog footer
-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 = """
@@ -23,11 +18,5 @@ No significant changes.
 {% endfor %}
 {%- endif %}
 """
-# template for the changelog footer
-footer = """
-<!-- generated by git-cliff -->
-"""
-# remove the leading and trailing whitespace from the templates
-trim = true
 # render body even when there are no releases to process
 render_always = true

.github/fixtures/test-bitbucket-integration/cliff.toml

@@ -36,26 +36,15 @@ body = """
 {%- endfor -%}
 {% raw %}\n\n{% endraw -%}
 """
-# Remove leading and trailing whitespaces from the changelog's body.
-trim = true
-# A Tera template to be rendered as the changelog's footer.
-# See https://keats.github.io/tera/docs/#introduction
-footer = """
-<!-- generated by -cliff -->
-"""
 
 [git]
 # Parse commits according to the conventional commits specification.
 # See https://www.conventionalcommits.org
 conventional_commits = false
 # Exclude commits that do not match the conventional commits specification.
 filter_unconventional = true
-# Split commits on newlines, treating each line as an individual commit.
-split_commits = false
 # An array of regex based parsers to modify commit messages prior to further processing.
 commit_preprocessors = [
   # Remove issue numbers.
   { pattern = '\((\w+\s)?#([0-9]+)\)', replace = "" },
 ]
-# Prevent commits that are breaking from being excluded by commit parsers.
-protect_breaking_commits = false

.github/fixtures/test-bitbucket-integration/expected.md

@@ -1,3 +1,7 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
 ## What's Changed
 * feat(config): support multiple file formats by @orhun <[email protected]>
 * feat(cache): use cache while fetching pages by @orhun <[email protected]>
@@ -17,4 +21,4 @@
 ### New Contributors
 * @orhun <[email protected]> made their first contribution
 
-<!-- generated by -cliff -->
+<!-- generated by git-cliff -->

.github/fixtures/test-bump-initial-tag-cli-arg/cliff.toml

@@ -2,12 +2,6 @@
 # https://git-cliff.org/docs/configuration
 
 [changelog]
-# A Tera template to be rendered as the changelog's header.
-# See https://keats.github.io/tera/docs/#introduction
-header = """
-# Changelog\n
-All notable changes to this project will be documented in this file.\n
-"""
 # A Tera template to be rendered for each release in the changelog.
 # See https://keats.github.io/tera/docs/#introduction
 body = """
@@ -23,13 +17,6 @@ body = """
     {% endfor %}
 {% endfor %}\n
 """
-# A Tera template to be rendered as the changelog's footer.
-# See https://keats.github.io/tera/docs/#introduction
-footer = """
-<!-- generated by git-cliff -->
-"""
-# Remove leading and trailing whitespaces from the changelog's body.
-trim = true
 
 [git]
 # An array of regex based parsers for extracting data from the commit message.

.github/fixtures/test-bump-initial-tag-default/cliff.toml

@@ -2,12 +2,6 @@
 # https://git-cliff.org/docs/configuration
 
 [changelog]
-# A Tera template to be rendered as the changelog's header.
-# See https://keats.github.io/tera/docs/#introduction
-header = """
-# Changelog\n
-All notable changes to this project will be documented in this file.\n
-"""
 # A Tera template to be rendered for each release in the changelog.
 # See https://keats.github.io/tera/docs/#introduction
 body = """
@@ -23,13 +17,6 @@ body = """
     {% endfor %}
 {% endfor %}\n
 """
-# A Tera template to be rendered as the changelog's footer.
-# See https://keats.github.io/tera/docs/#introduction
-footer = """
-<!-- generated by git-cliff -->
-"""
-# Remove leading and trailing whitespaces from the changelog's body.
-trim = true
 
 [git]
 # An array of regex based parsers for extracting data from the commit message.

.github/fixtures/test-bump-initial-tag/cliff.toml

@@ -2,12 +2,6 @@
 # https://git-cliff.org/docs/configuration
 
 [changelog]
-# A Tera template to be rendered as the changelog's header.
-# See https://keats.github.io/tera/docs/#introduction
-header = """
-# Changelog\n
-All notable changes to this project will be documented in this file.\n
-"""
 # A Tera template to be rendered for each release in the changelog.
 # See https://keats.github.io/tera/docs/#introduction
 body = """
@@ -23,13 +17,6 @@ body = """
     {% endfor %}
 {% endfor %}\n
 """
-# A Tera template to be rendered as the changelog's footer.
-# See https://keats.github.io/tera/docs/#introduction
-footer = """
-<!-- generated by git-cliff -->
-"""
-# Remove leading and trailing whitespaces from the changelog's body.
-trim = true
 
 [git]
 # An array of regex based parsers for extracting data from the commit message.

.github/fixtures/test-bump-unreleased-with-tag-message-arg/cliff.toml

@@ -1,9 +1,4 @@
 [changelog]
-# template for the changelog footer
-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 = """
@@ -22,12 +17,6 @@ body = """
     {% 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

.github/fixtures/test-bump-version-custom-minor/cliff.toml

@@ -1,9 +1,4 @@
 [changelog]
-# template for the changelog footer
-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 = """
@@ -19,12 +14,6 @@ body = """
     {% endfor %}
 {% endfor %}\n
 """
-# template for the changelog footer
-footer = """
-<!-- generated by git-cliff -->
-"""
-# remove the leading and trailing whitespace from the templates
-trim = true
 
 [bump]
 features_always_bump_minor = true