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A way to use jinja2 templates with *sh scripts.
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README.md

Jinja Simple CLI

This project offers a way to easily compose templates directly from the command line, ideal to use in junction with other cli utilities.

You could check the examples under the examples directory and check the By running jinja-cli --help on your terminal, you'll get all the basic functioning for the tool.

Basics

If you know Jinja, you will get how this works easily.

  • INPUT or template, is the text stream or file that you are attempting to render by default stdin.
  • DATA or json-data, is the text stream or file that contains the data used in the template and it's dependencies, by default is an empty json.
  • ROOT or template-directory, is the search path for jinja's FileSystemLoader.
  • CONFIG or extensions-file, is a python file that contains functions that will be avalible to call from the templates, could be filters.
  • OUTPUT or output, is where to write the rendered template, by default is stdout.

Remark: This is more related to *sh scripting than this tool, but notice that we mention streams, so we could run the following commands and they would be equivalent in output.

cat examples/templates/users.htm | jinja-cli -j examples/data/users.json
cat examples/data/users.json | jinja-cli -j - -i examples/templates/users.htm
jinja-cli -i examples/templates/users.htm -j examples/data/users.json
jinja-cli -i <(cat examples/templates/users.htm) -j <(cat examples/data/users.json)

This is because the argument parsing for the input template and json data, was thinked in a way that you send any of does two as streams so we could use and compose with other cli tools.

Examples

All the examples could be reproduced with the files in the examples directory.

Curl in to a template

Using the data variables you could fill templates pulling data from any kind of source, and insert it using standard input

$ curl https://xkcd.com/2/info.0.json 2> /dev/null | jinja-cli -i examples/templates/xkcd.htm -j -
<article>
    <h2>Petit Trees (sketch)</h2>
    <img src="https://imgs.xkcd.com/comics/tree_cropped_(1).jpg"/>
    <p>'Petit' being a reference to Le Petit Prince, which I only thought about halfway through the sketch</p>
</article>

Using Jinja Filters

You could also use custom functions and call them as filters from your config file, eg.

# fragment of examples/extensions.py
import jinjasimplecli.extensions as je

@je.filter('issue')
def hello_world(issue_number):
    url = f"https://api.github.com/repos/ekiim/jinjasimplecli/issues/{issue_number}"
    data = requests.get(url).json()
    return f"Issue - {data['number']} - {data['title']}"

So now running $ echo "{{ 1|issue }}" | jinja-cli -c examples/extensions.py we get Issue - 1 - Merge Guide and Readme.

Jinja other features

When using template inheritance or referencing another template to import or include, you should make reference to it, considering the ROOT path you provided.

License

Jinja Simple CLI is licensed under the BSD 3-Clause license.

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