Templates in Context Values
The values (but not the keys!) of cookiecutter.json are also Jinja2 templates. Values from user prompts are added to the context immediately, such that one context value can be derived from previous values. This approach can potentially save your user a lot of keystrokes by providing more sensible defaults.
Basic Example: Templates in Context
Python packages show some patterns for their naming conventions:
a human-readable project name
a lowercase, dashed repository name
an importable, dash-less package name
Here is a cookiecutter.json with templated values for this pattern:
{
"project_name": "My New Project",
"project_slug": "{{ cookiecutter.project_name|lower|replace(' ', '-') }}",
"pkg_name": "{{ cookiecutter.project_slug|replace('-', '') }}"
}
If the user takes the defaults, or uses no_input, the templated values will be:
my-new-project
mynewproject
Or, if the user gives Yet Another New Project, the values will be:
yet-another-new-projectyetanothernewproject