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A jinja2 extension for optionally including files in cookiecutter templates

It's a well known and documented issue that cookiecutter does not support conditionally included files and directories. See this post on github.

This package unlocks that feature with simple jinja2 filters that can be applied to:

  • optional file inclusion
  • optional directory inclusion
  • optional inclusion of blocks within templates
  • optional inclusion of in-line text

Setup

This assumes that you have cookiecutter installed already and have a project that you are building into a template. This also assumes you are managing your environment in your preferred way.

First, install cut-out-cookies:

$ pip install cut-out-cookies

If you are using poetry, pipenv, flit, etc you will need to convert the command for your setup.

Add the extension to your cookiecutter.json file like so:

{
    "full_name": "Tucker Beck",
    "email": "[email protected]",
    "project_name": "Sugar Cookies Project",
    "version": "0.1.0",
    "_extensions": ["cutout.Stencil"]
}

The only important line here is where the extension is being added. The reset is just for example context.

Next, you should add some 'patterns' to your cookiecutter.json that you will use to 'decorate' your optional cookies with:

{
    "full_name": "Tucker Beck",
    "email": "[email protected]",
    "project_name": "Sugar Cookies Project",
    "version": "0.1.0",
    "_extensions": ["cutout.Stencil"],
    "include_sprinkles": false,
    "include_frosting": false
}

This indicates that, by default, any cookies decorated with 'sprinkles' or 'frosting' should not be included in the generated project. The user will now be prompted if they want to include the optional features 'sprinkles' and 'frosting'

Finally, due to this issue on the cookiecutter github repo you will need to install a post-gen project hook to cleanup the directories that you intend to omit. Add a hooks directory in your template with a file called post_gen_project.py. That file needs to contain this:

from cutout import cleanup

cleanup()

That's it. You should be ready to make some cookies now!

Using cut-out-cookies stencils

For a case study, let's suppose you are building a project stencil called 'Sugar Cookies' that starts out looking like this:

sugar-cookies/
├── cookiecutter.json
└── {{cookiecutter.project_name}}
    └── README.md

Optionally including a file

To indicate that a file should only be included if a certain pattern is included, you use the stencil filter in its template filename.

Let's create a file called 'tasty.py' that should only be included if the 'sprinkles' pattern is applied. To do that, we'll apply the stencil filter like so:

examples/
├── cookiecutter.json
└── {{cookiecutter.project_name}}
    ├── README.md
    └── {{'tasty.py'|stencil('sprinkles')}}

Now if the include_sprinkles setting is enabled in cookiecutter, the rendered project will have a file called tasty.py. If it is not enabled, the tasty.py source file will be omitted altogether

Optionally including a directory

To indicate that a directory should only be included if a certain pattern is included, you use the stencil_path filter in its name. Unfortunately, the stencil filter cannot be used for directories due to this issue. The stencil_path causes non-matching directories to be Prefixed with a special flag value ('OBSCURATA_LAMINA_INTERRASILIS'). Then, a post-gen hook can be used to remove these directories. This approach is a bit of a hack, but until the mentioned issue is fixed, we've tried to make it as painless as possible by including a cleanup function that can be easily added to a post_gen_project hook.

Let's create a diretory called 'batch' that should only be included if the 'frosting' pattern is included. To do that, we'll apply the stencil_path filter like so:

examples/
├── cookiecutter.json
├── hooks/
│   └── post_gen_project.py
└── {{cookiecutter.project_name}}
    ├── README.md
    └── {{'batch'|stencil_path('frosting')}}
        ├── star_shaped.py
        └── heart_shaped.py

Now if the include_frosting setting is enabled in cookiecutter, the rendered project will have a directory called batch that includes two file called star_shaped.py and heart_shaped.py. If it is not enabled, the directory will be named 'OBSCURATA_LAMINA_INTERRASILIS--batch' in the generated project. If you have the post_gen_project hook defined like this:

from cutout import cleanup
cleanup()

Then the non-matching directories will be removed after project generation.

Optionally include a block of text

To indicate that a block of text should only be included if a cerain pattern is included, you use the stencil filter block like so:

This text will always be included
{%- filter stencil('glitter') }
This text will only be inlcuded if the glitter pattern is included in the
cookiecutter config
{% endfilter %}

Optionally include text inline

To indicate that a bit of in-line text should only be included if a cerain pattern is included, you use the stencil filter like so:

This text includes {{ 'whipped cream' | stencil('creamy') }} frosting

The text above will only include 'whipped cream' if the creamy pattern in included