feat(template): allow to override the template from cli, configuration and plugins

Fixes #132
Fixes #384
Fixes #433
Closes #376

Author: noirbizarre

Diff for: commitizen/changelog.py

@@ -31,13 +31,21 @@
 from datetime import date
 from typing import Callable, Dict, Iterable, List, Optional, Tuple
 
-from jinja2 import Environment, PackageLoader
+from jinja2 import (
+    BaseLoader,
+    ChoiceLoader,
+    Environment,
+    FileSystemLoader,
+    PackageLoader,
+)
 
 from commitizen import defaults
 from commitizen.bump import normalize_tag
 from commitizen.exceptions import InvalidConfigurationError, NoCommitsFoundError
 from commitizen.git import GitCommit, GitTag
 
+DEFAULT_TEMPLATE = "keep_a_changelog_template.j2"
+
 
 def get_commit_tag(commit: GitCommit, tags: List[GitTag]) -> Optional[GitTag]:
     return next((tag for tag in tags if tag.rev == commit.rev), None)
@@ -139,11 +147,18 @@ def order_changelog_tree(tree: Iterable, change_type_order: List[str]) -> Iterab
     return sorted_tree
 
 
-def render_changelog(tree: Iterable) -> str:
-    loader = PackageLoader("commitizen", "templates")
+def render_changelog(
+    tree: Iterable,
+    loader: Optional[BaseLoader] = None,
+    template: Optional[str] = None,
+    **kwargs,
+) -> str:
+    loader = ChoiceLoader(
+        [FileSystemLoader("."), loader or PackageLoader("commitizen", "templates")]
+    )
     env = Environment(loader=loader, trim_blocks=True)
-    jinja_template = env.get_template("keep_a_changelog_template.j2")
-    changelog: str = jinja_template.render(tree=tree)
+    jinja_template = env.get_template(template or DEFAULT_TEMPLATE)
+    changelog: str = jinja_template.render(tree=tree, **kwargs)
     return changelog
 
 

Diff for: commitizen/cli.py

@@ -190,6 +190,20 @@
                         "default": None,
                         "help": "keep major version at zero, even for breaking changes",
                     },
+                    {
+                        "name": ["--template", "-t"],
+                        "help": (
+                            "changelog template file name "
+                            "(relative to the current working directory)"
+                        ),
+                    },
+                    {
+                        "name": ["--extra", "-e"],
+                        "action": "append",
+                        "dest": "extras",
+                        "metavar": "EXTRA",
+                        "help": "a changelog extra variable (in the form 'key=value')",
+                    },
                     {
                         "name": "manual_version",
                         "type": str,
@@ -246,6 +260,20 @@
                             "If not set, it will generate changelog from the start"
                         ),
                     },
+                    {
+                        "name": ["--template", "-t"],
+                        "help": (
+                            "changelog template file name "
+                            "(relative to the current working directory)"
+                        ),
+                    },
+                    {
+                        "name": ["--extra", "-e"],
+                        "action": "append",
+                        "dest": "extras",
+                        "metavar": "EXTRA",
+                        "help": "a changelog extra variable (in the form 'key=value')",
+                    },
                 ],
             },
             {

Diff for: commitizen/commands/bump.py

@@ -46,6 +46,7 @@ def __init__(self, config: BaseConfig, arguments: dict):
                     "gpg_sign",
                     "annotated_tag",
                     "major_version_zero",
+                    "template",
                 ]
                 if arguments[key] is not None
             },
@@ -58,6 +59,8 @@ def __init__(self, config: BaseConfig, arguments: dict):
         self.no_verify = arguments["no_verify"]
         self.check_consistency = arguments["check_consistency"]
         self.retry = arguments["retry"]
+        self.template = arguments["template"] or self.config.settings.get("template")
+        self.extras = arguments["extras"]
 
     def is_initial_tag(self, current_tag_version: str, is_yes: bool = False) -> bool:
         """Check if reading the whole git tree up to HEAD is needed."""
@@ -244,6 +247,8 @@ def __call__(self):  # noqa: C901
                     "unreleased_version": new_tag_version,
                     "incremental": True,
                     "dry_run": dry_run,
+                    "template": self.template,
+                    "extras": self.extras,
                 },
             )
             changelog_cmd()

Diff for: commitizen/commands/changelog.py

@@ -49,6 +49,10 @@ def __init__(self, config: BaseConfig, args):
         self.tag_format = args.get("tag_format") or self.config.settings.get(
             "tag_format"
         )
+        self.template = args.get("template") or self.config.settings.get("template")
+        self.extras = dict(
+            extra.split("=") for extra in args.get("extras") or [] if "=" in extra
+        )
 
     def _find_incremental_rev(self, latest_version: str, tags: List[GitTag]) -> str:
         """Try to find the 'start_rev'.
@@ -161,7 +165,13 @@ def __call__(self):
         )
         if self.change_type_order:
             tree = changelog.order_changelog_tree(tree, self.change_type_order)
-        changelog_out = changelog.render_changelog(tree)
+
+        extras = self.cz.template_extras.copy()
+        extras.update(self.config.settings["extras"])
+        extras.update(self.extras)
+        changelog_out = changelog.render_changelog(
+            tree, loader=self.cz.template_loader, template=self.template, **extras
+        )
         changelog_out = changelog_out.lstrip("\n")
 
         if self.dry_run:

Diff for: commitizen/cz/base.py

@@ -1,9 +1,13 @@
+from __future__ import annotations
+
 from abc import ABCMeta, abstractmethod
-from typing import Callable, Dict, List, Optional, Tuple
+from typing import Any, Callable, Dict, List, Optional, Tuple
 
+from jinja2 import BaseLoader
 from prompt_toolkit.styles import Style, merge_styles
 
 from commitizen import git
+from commitizen.changelog import DEFAULT_TEMPLATE
 from commitizen.config.base_config import BaseConfig
 from commitizen.defaults import Questions
 
@@ -40,6 +44,10 @@ class BaseCommitizen(metaclass=ABCMeta):
     # Executed only at the end of the changelog generation
     changelog_hook: Optional[Callable[[str, Optional[str]], str]] = None
 
+    template: str = DEFAULT_TEMPLATE
+    template_loader: Optional[BaseLoader] = None
+    template_extras: dict[str, Any] = {}
+
     def __init__(self, config: BaseConfig):
         self.config = config
         if not self.config.settings.get("style"):

Diff for: commitizen/defaults.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pathlib
 from collections import OrderedDict
 from typing import Any, Dict, Iterable, List, MutableMapping, Optional, Tuple, Union
@@ -40,6 +42,8 @@ class Settings(TypedDict, total=False):
     style: Optional[List[Tuple[str, str]]]
     customize: CzSettings
     major_version_zero: bool
+    template: Optional[str]
+    extras: dict[str, Any]
 
 
 name: str = "cz_conventional_commits"
@@ -65,6 +69,8 @@ class Settings(TypedDict, total=False):
     "update_changelog_on_bump": False,
     "use_shortcuts": False,
     "major_version_zero": False,
+    "template": None,
+    "extras": {},
 }
 
 MAJOR = "MAJOR"

Diff for: docs/bump.md

@@ -60,6 +60,7 @@ usage: cz bump [-h] [--dry-run] [--files-only] [--local-version] [--changelog]
                [--devrelease DEVRELEASE] [--increment {MAJOR,MINOR,PATCH}]
                [--check-consistency] [--annotated-tag] [--gpg-sign]
                [--changelog-to-stdout] [--retry] [--major-version-zero]
+               [--template TEMPLATE] [--extra EXTRA]
                [MANUAL_VERSION]
 
 positional arguments:
@@ -95,6 +96,10 @@ options:
                         Output changelog to the stdout
   --retry               retry commit if it fails the 1st time
   --major-version-zero  keep major version at zero, even for breaking changes
+  --template TEMPLATE, -t TEMPLATE
+                        changelog template file name (relative to the current working directory)
+  --extra EXTRA, -e EXTRA
+                        a changelog extra variable (in the form 'key=value')
 ```
 
 ### `--files-only`
@@ -213,6 +218,17 @@ We recommend setting `major_version_zero = true` in your configuration file whil
 is in its initial development. Remove that configuration using a breaking-change commit to bump
 your project’s major version to `v1.0.0` once your project has reached maturity.
 
+### `--template`
+
+Provides your own changelog jinja template.
+See [the template customization section](customization.md#customizing-the-changelog-template)
+
+### `--extra`
+
+Provides your own changelog extra variables by using the `extras` settings or the `--extra` parameter.
+See [the template customization section](customization.md#customizing-the-changelog-template)
+
+
 ## Avoid raising errors
 
 Some situations from commitizen rise an exit code different than 0.

Diff for: docs/changelog.md

@@ -7,6 +7,7 @@ This command will generate a changelog following the committing rules establishe
 ```bash
 $ cz changelog --help
 usage: cz changelog [-h] [--dry-run] [--file-name FILE_NAME] [--unreleased-version UNRELEASED_VERSION] [--incremental] [--start-rev START_REV]
+                    [--template TEMPLATE] [--extra EXTRA]
                     [rev_range]
 
 positional arguments:
@@ -22,6 +23,10 @@ optional arguments:
   --incremental         generates changelog from last created version, useful if the changelog has been manually modified
   --start-rev START_REV
                         start rev of the changelog.If not set, it will generate changelog from the start
+  --template TEMPLATE, -t TEMPLATE
+                        changelog template file name (relative to the current working directory)
+  --extra EXTRA, -e EXTRA
+                        a changelog extra variable (in the form 'key=value')
 ```
 
 ### Examples
@@ -161,6 +166,16 @@ cz changelog --start-rev="v0.2.0"
 changelog_start_rev = "v0.2.0"
 ```
 
+### `template`
+
+Provides your own changelog jinja template by using the `template` settings or the `--template` parameter.
+See [the template customization section](customization.md#customizing-the-changelog-template)
+
+### `extras`
+
+Provides your own changelog extra variables by using the `extras` settings or the `--extra` parameter.
+See [the template customization section](customization.md#customizing-the-changelog-template)
+
 ## Hooks
 
 Supported hook methods:

Diff for: docs/config.md

@@ -20,6 +20,8 @@
 | `customize`                | `dict` | `None`                      | **This is only supported when config through `toml`.** Custom rules for committing and bumping. [See more][customization]                                                                       |
 | `use_shortcuts`            | `bool` | `false`                     | If enabled, commitizen will show keyboard shortcuts when selecting from a list. Define a `key` for each of your choices to set the key. [See more][shortcuts]                                   |
 | `major_version_zero`       | `bool` | `false`                     | When true, breaking changes on a `0.x` will remain as a `0.x` version. On `false`, a breaking change will bump a `0.x` version to `1.0`. [major-version-zero]                                   |
+| <a name="cfg-template"></a>`template` | `str`  | `None`  | Provide custom changelog jinja template path relative to the current working directory. [See more (template customization)][template-customization] |
+| <a name="cfg-extras"></a>`extras` | `dict`  | `{}`  | Provide extra variables to the changelog template. [See more (template customization)][template-customization] |
 
 ## pyproject.toml or .cz.toml
 
@@ -119,4 +121,5 @@ commitizen:
 [additional-features]: https://github.com/tmbo/questionary#additional-features
 [customization]: customization.md
 [shortcuts]: customization.md#shortcut-keys
+[template-customization]: customization.md#customizing-the-changelog-template
 [annotated-tags-vs-lightweight]: https://stackoverflow.com/a/11514139/2047185

Diff for: docs/customization.md

@@ -381,3 +381,85 @@ from commitizen.cz.exception import CzException
 class NoSubjectProvidedException(CzException):
     ...
 ```
+
+## Customizing the changelog template
+
+Commitizen gives you the possibility to provide your own changelog template, by:
+
+- either by providing one with you customization class
+- either by providing one from the current working directory and setting it:
+    - as [configuration][template-config]
+    - as `--template` parameter to both `bump` and `changelog` commands
+- either by providing a template with the same name as the default template
+
+By default, the template used is the `keep_a_changelog_template.j2` file from the commitizen repository.
+
+### Providing a template with your customization class
+
+There is 3 parameters available to hcange the template rendering from your custom `BaseCommitizen`.
+
+| Parameter         | Type   | Default | Description                                                                                           |
+| ----------------- | ------ | ------- | ----------------------------------------------------------------------------------------------------- |
+| `template`        | `str`  | `None`  | Provide your own template name (default to `keep_a_changelog_template.j2`)                            |
+| `template_loader` | `str`  | `None`  | Override the default template loader (so you can provide template from you customization class)       |
+| `template_extras` | `dict` | `None`  | Provide some extra template parameters                                                                |
+
+Let's see an example.
+
+```python
+from commitizen.cz.base import BaseCommitizen
+from jinja2 import PackageLoader
+
+
+class MyPlugin(BaseCommitizen):
+    template = "CHANGELOG.md.jinja"
+    template_loader = PackageLoader("my_plugin", "templates")
+    template_extras = {"key": "value"}
+```
+
+This snippet will:
+
+- use `CHANGELOG.md.jinja` as template name
+- search for it in the `templates` directory for `my_plugin` package
+- add the `key=value` variable in the template
+
+### Providing a template from the current working directory
+
+Users can provides their own template from their current working directory (your project root) by:
+
+- providing a template with the same name (`keep_a_changelog_template.j2` unless overriden by your custom class)
+- setting your template path as `template` configuration
+- giving your template path as `--template` parameter to `bump` and `changelog` commands
+
+!!! Note
+    The path is relative to the current working directory, aka. your project root most of the time,
+
+### Template variables
+
+The default template use a single `tree` variable which is a list of entries (a release) with the following format:
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| version | `str` | The release version |
+| date | `datetime` | The release date |
+| changes | `list[tuple[str, list[Change]]]` | The release sorted changes list in the form `(type,changes)` |
+
+Each `Change` has the following fields:
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| scope | `Optional[str]` | An optionnal scope |
+| message | `str` | The commit message body |
+
+!!! Note
+    The field values depend on the customization class and/or the settings you provide
+
+When using another template (either provided by a plugin or by yourself), you can also pass extra template variables
+by:
+
+- defining them in your configuration with the [`extras` settings][extras-config]
+- providing them on the commandline with the `--extra/-e` parameter to `bump` and `changelog` commands
+
+
+[template-config]: config.md#cfg-template
+[extras-config]: config.md#cfg-extras