Development guide

Jinja2 extensions for Moban

Since version 0.2, mobanfile supports an extra field plugin_dir, along with template_dir. When you put your own jinja2 filters, tests and globals in your moban repo, you can let moban know about them via this keyword.

Importantly, you have to have __init__.py file in your plugin_dir. Otherwise, your plugins will NOT be loaded.

Jinja2 Filter

split_length

It breaks down the given string into a fixed length paragraph. Here is the syntax:

{% for line in your_string | split_length(your_line_with) %}
{{line}}
{% endfor %}

It is used to keep changelog formatted in CHANGELOG.rst.jj2 in pypi-mobans project

github_expand

It expands simple hashtags into github issues. Here is the syntax:

{{ your_github_string | github_expand }}

It makes it easy to mention github reference in change log in all projects. Here is the place it is applied: CHANGELOG.rst.jj2 in pypi-mobans project

Here is Grammar in the changelog.yml:

=============== ==============================
Syntax          Meaning
=============== ==============================
`#1`            moban issues 1
`PR#1`          moban pull request 1
`pyexcel#1`     other project issues 1
`pyexcel#PR#1`  other project pulll request 1
=============== ==============================

More details can be found in moban’s changelog.yml

repr

Returns a single quoted string in the templated file

Built-in Tests

exists

Test if a file exists or not

Jinja2 Globals

It is possible to write an installable package including your own jinja2 filters, tests and globals. Please email me for more details.

Template engine extension for Moban

moban version 0.2 started using lml to employ loose couple plugins. Other template engines, such as marko, haml can be plugged into moban seamless.

_images/engine.svg

In order plugin other template engines, it is to write a lml plugin. The following is an example starting point for any template engine.

@PluginInfo(
    constants.TEMPLATE_ENGINE_EXTENSION, tags=["file", "extensions", "for", "your", "template"]
)
class Engine(object):
    def __init__(self, template_fs, options=None):
        """
        A list template directories will be given to your engine class
        """

    def get_template(self, template_file):
        """
        Given a relative path to your template file, please return a templatable thing that does
        the templating function in next function below
        """

    def apply_template(self, template, data, output):
         """
         Given the template object from `get_template` function, and data as python dictionary,
         and output as intended output file, please return "utf-8" encoded string.
         """

After you will have finished the engine plugin, you can either place it in plugin_dir in order to get it loaded, or make an installable python package. In the latter case, please refer to yehua: doing that in less than 5 minutes.