fix(changelog): fix missing commit fields in context (orhun#837)

* feat(commit): add `raw_message` to `Commit`

* test(fixtures): add test generate all fields in conventional commits

* test(fixtures): add test do not discard missing fields in conventional
commits when reading from context

* docs(website): add `raw_message` fields to `context.md`

.github/fixtures/test-conventional-commit/cliff.toml

@@ -0,0 +1,35 @@
+[changelog]
+# template for the changelog footer
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file.
+"""
+# template for the changelog body
+# https://keats.github.io/tera/docs/#introduction
+body = """
+{% for group, commits in commits | group_by(attribute="group") %}
+    ## {{ group | striptags | trim | upper_first }}
+    {% for commit in commits %}
+          {% if commit.scope %}*({{ commit.scope }})* {% endif %}\
+          {% if commit.breaking %}[**breaking**]: {{ commit.breaking_description }}{% endif %}
+          {{ commit.message }}: {{ commit.body }}\
+          {% for footer in commit.footers %}
+            - {{ footer.token }}{{ footer.separator }} {{ footer.value }}\
+          {% endfor %}
+    {% endfor %}\
+{% endfor %}\n
+"""
+# template for the changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+
+[git]
+# parse the commits based on https://www.conventionalcommits.org
+conventional_commits = true
+# process each line of a commit as an individual commit
+split_commits = false
+commit_parsers = [
+  { message = "^feat", group = "Features", default_scope = "app" },
+  { message = "^fix" },
+]

.github/fixtures/test-conventional-commit/commit.sh

@@ -0,0 +1,52 @@
+#!/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(web): feature 1, breaking change in footer
+
+Body feature 1
+
+BREAKING CHANGE: breaking change description feature 1
+Signed-off-by: user1 <user1@example.com>
+Reviewed-by: user2
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:10" git commit --allow-empty -m \
+    "feat(web)!: feature 2, breaking chain in description
+
+Body feature 2
+
+Signed-off-by: user3 <user3@example.com>
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:11" git commit --allow-empty -m \
+    "feat!: feature 3, use default scope = app
+
+Body feature 2
+
+Signed-off-by: user3 <user3@example.com>
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:12" git commit --allow-empty -m \
+    "fix(scope): fix 1, use scope as group
+
+Body fix 1
+
+Fix: #1
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:13" git commit --allow-empty -m \
+    "fix(front-end): fix 2, no footer
+
+Body fix 2
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:14" git commit --allow-empty -m \
+    "fix(front-end): fix 3 and 4, no body but footer
+
+Fix: #3
+Fix: #4
+"
+
+git tag v0.1.0

.github/fixtures/test-conventional-commit/expected.md

@@ -0,0 +1,35 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## Features
+
+*(web)* [**breaking**]: breaking change description feature 1
+feature 1, breaking change in footer: Body feature 1
+- BREAKING CHANGE: breaking change description feature 1
+- Signed-off-by: user1 <user1@example.com>
+- Reviewed-by: user2
+
+*(web)* [**breaking**]: feature 2, breaking chain in description
+feature 2, breaking chain in description: Body feature 2
+- Signed-off-by: user3 <user3@example.com>
+
+*(app)* [**breaking**]: feature 3, use default scope = app
+feature 3, use default scope = app: Body feature 2
+- Signed-off-by: user3 <user3@example.com>
+
+## Fix
+
+*(scope)* 
+fix 1, use scope as group: Body fix 1
+- Fix: #1
+
+*(front-end)* 
+fix 2, no footer: Body fix 2
+
+*(front-end)* 
+fix 3 and 4, no body but footer: 
+- Fix: #3
+- Fix: #4
+
+<!-- generated by git-cliff -->

.github/fixtures/test-from-context-does-not-discard-fields/cliff.toml

@@ -0,0 +1,35 @@
+[changelog]
+# template for the changelog footer
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file.
+"""
+# template for the changelog body
+# https://keats.github.io/tera/docs/#introduction
+body = """
+{% for group, commits in commits | group_by(attribute="group") %}
+    ## {{ group | striptags | trim | upper_first }}
+    {% for commit in commits %}
+          {% if commit.scope %}*({{ commit.scope }})* {% endif %}\
+          {% if commit.breaking %}[**breaking**]: {{ commit.breaking_description }}{% endif %}
+          {{ commit.message }}: {{ commit.body }}\
+          {% for footer in commit.footers %}
+            - {{ footer.token }}{{ footer.separator }} {{ footer.value }}\
+          {% endfor %}
+    {% endfor %}\
+{% endfor %}\n
+"""
+# template for the changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+
+[git]
+# parse the commits based on https://www.conventionalcommits.org
+conventional_commits = true
+# process each line of a commit as an individual commit
+split_commits = false
+commit_parsers = [
+  { message = "^feat", group = "Features", default_scope = "app" },
+  { message = "^fix" },
+]

.github/fixtures/test-from-context-does-not-discard-fields/commit.sh

@@ -0,0 +1,52 @@
+#!/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(web): feature 1, breaking change in footer
+
+Body feature 1
+
+BREAKING CHANGE: breaking change description feature 1
+Signed-off-by: user1 <user1@example.com>
+Reviewed-by: user2
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:10" git commit --allow-empty -m \
+    "feat(web)!: feature 2, breaking chain in description
+
+Body feature 2
+
+Signed-off-by: user3 <user3@example.com>
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:11" git commit --allow-empty -m \
+    "feat!: feature 3, use default scope = app
+
+Body feature 2
+
+Signed-off-by: user3 <user3@example.com>
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:12" git commit --allow-empty -m \
+    "fix(scope): fix 1, use scope as group
+
+Body fix 1
+
+Fix: #1
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:13" git commit --allow-empty -m \
+    "fix(front-end): fix 2, no footer
+
+Body fix 2
+"
+
+GIT_COMMITTER_DATE="2022-04-06 01:25:14" git commit --allow-empty -m \
+    "fix(front-end): fix 3 and 4, no body but footer
+
+Fix: #3
+Fix: #4
+"
+
+git tag v0.1.0