chore(changelog): show full commit message (#423)

This allows someone reading the changelog to search for information
about breaking changes or implementation of new functionality.

- refactored the commit template part to a macro instead of repeating it
- added a link to the commit and to the release
- updated the current changelog for the alpha and unreleased changes
- Automatically changed the existing * lists to - lists

.markdownlint.yaml

@@ -7,3 +7,6 @@ no-inline-html:
     - summary
 line-length:
   line_length: 100
+
+# to support repeated headers in the changelog
+no-duplicate-heading: false

cliff.toml

@@ -3,35 +3,51 @@
 [changelog]
 # changelog header
 header = """
-# Changelog\n
-All notable changes to this project will be documented in this file.\n
+# Changelog
+
+All notable changes to this project will be documented in this file.
 """
 # template for the changelog body
-# https://tera.netlify.app/docs/#introduction
+# https://keats.github.io/tera/docs/#introduction
+# note that the - before / after the % controls whether whitespace is rendered between each line.
+# Getting this right so that the markdown renders with the correct number of lines between headings
+# code fences and list items is pretty finicky. Note also that the 4 backticks in the commit macro
+# is intentional as this escapes any backticks in the commit body.
 body = """
-{% if version %}\
-    ## {{ version }} - {{ timestamp | date(format="%Y-%m-%d") }}
-{% else %}\
-    ## [unreleased]
-{% endif %}\
+{%- if not version %}
+## [unreleased]
+{% else -%}
+## [{{ version }}](https://github.com/ratatui-org/ratatui/releases/tag/{{ version }}) - {{ timestamp | date(format="%Y-%m-%d") }}
+{% endif -%}
+
+{% macro commit(commit) -%}
+- *({{commit.scope | default(value = "uncategorized")}})* {{ commit.message | upper_first }}
+([{{ commit.id | truncate(length=7, end="") }}]({{ "https://github.com/ratatui-org/ratatui/commit/" ~ commit.id }}))
+{%- if commit.breaking %} [**breaking**]{% endif %}
+{%- if commit.body %}
+
+  ````text {#- 4 backticks escape any backticks in body #}
+  {{commit.body | indent(prefix="  ") }}
+  ````
+{%- endif %}
+{% endmacro -%}
+
 {% for group, commits in commits | group_by(attribute="group") %}
-    ### {{ group | striptags | trim | upper_first }}
-    {% for commit in commits
-    | filter(attribute="scope")
-    | sort(attribute="scope") %}
-        - *({{commit.scope}})* {{ commit.message | upper_first }}{% if commit.breaking %} [**breaking**]{% endif %}
-    {%- endfor -%}
-    {% raw %}\n{% endraw %}\
-    {%- for commit in commits %}
-        {%- if commit.scope -%}
-        {% else -%}
-            - *(uncategorized)* {{ commit.message | upper_first }}{% if commit.breaking %} [**breaking**]{% endif %}
-        {% endif -%}
-    {% endfor -%}
-{% endfor %}\n
+### {{ group | striptags | trim | upper_first }}
+{% for commit in commits | filter(attribute="scope") | sort(attribute="scope") %}
+{{ self::commit(commit=commit) }}
+{%- endfor -%}
+{% for commit in commits %}
+{%- if not commit.scope %}
+{{ self::commit(commit=commit) }}
+{%- endif -%}
+{%- endfor -%}
+{%- endfor %}
 """
+
+
 # remove the leading and trailing whitespace from the template
-trim = true
+trim = false
 # changelog footer
 footer = """
 <!-- generated by git-cliff -->
@@ -69,6 +85,9 @@ commit_parsers = [
   { message = "^build", group = "<!-- 09 -->Build" },
   { message = "^ci", group = "<!-- 10 -->Continuous Integration" },
   { message = "^revert", group = "<!-- 11 -->Reverted Commits" },
+  # handle some old commits styles from pre 0.4
+  { message = "^(Buffer|buffer|Frame|frame|Gauge|gauge|Paragraph|paragraph):", group = "<!-- 07 -->Miscellaneous Tasks" },
+  { message = "^\\[", group = "<!-- 07 -->Miscellaneous Tasks" },
 ]
 # protect breaking changes from being skipped due to matching a skipping commit_parser
 protect_breaking_commits = false