Django/Jinja2 template indenter
Project description
DjHTML
A pure-Python Django/Jinja2 template indenter without dependencies.
DjHTML is a fully automatic template indenter that works with mixed HTML/CSS/Javascript templates that contain Django or Jinja2 template tags. It works similar to other code-formatting tools such as Black and interoperates nicely with pre-commit.
DjHTML is an indenter and not a formatter: it will only add/remove whitespace at the beginning of lines. It will not insert newlines or other characters. The goal is to correctly indent already well-structured templates, not to fix broken ones.
For example, consider the following incorrectly indented template:
<!doctype html>
<html>
<body>
{% block content %}
Hello, world!
{% endblock %}
<script>
$(function() {
console.log('Hi mom!');
});
</script>
</body>
</html>
This is what it will look like after processing by DjHTML:
<!doctype html>
<html>
<body>
{% block content %}
Hello, world!
{% endblock %}
<script>
$(function() {
console.log('Hi mom!');
});
</script>
</body>
</html>
Installation
Install DjHTML with the following command:
$ pip install djhtml
Usage
After installation you can indent templates using the djhtml
command. The default is to write the indented output to standard out.
To modify the source file in-place, use the -i / --in-place
option:
$ djhtml -i template.html
reindented template.html
1 template has been reindented.
The other available options are:
-h/--help: show overview of available options-q/--quiet: don't print any output-t/--tabwidth: set tabwidth (default is 4)-o/--output-file: write output to specified file
The installer also installs the djtxt, djcss, and djjs commands
for indenting plain text, CSS and Javascript source files,
respectively.
fmt:off and fmt:on
You can exclude specific lines from being processed with the
{# fmt:off #} and {# fmt:on #} operators:
<div class="
{# fmt:off #}
,-._|\
/ .\
\_,--._/
{# fmt:on #}
"/>
Contents inside <pre>, /* ... */ and {% comment %} tags are also
ignored (depending on the current mode).
Modes
The indenter operates in one of three different modes:
-
DjHTML mode: the default mode. Invoked by using the
djhtmlcommand or the pre-commit hook. -
DjCSS mode. Will be entered when a
<style>tag is encountered in DjHTML mode. It can also be invoked directly with the commanddjcss. -
DjJS mode. Will be entered when a
<script>tag is encountered in DjHTML mode. It can also be invoked directly with the commanddjjs.
pre-commit configuration
You can use DjHTML as a pre-commit hook to automatically indent your templates upon each commit.
First, install pre-commit:
$ pip install pre-commit
$ pre-commit install
Then, add the following to your .pre-commit-config.yaml:
repos:
- repo: https://github.com/rtts/djhtml
rev: main
hooks:
- id: djhtml
Finally, run the following command:
$ pre-commit autoupdate
Now when you run git commit you will see something like the
following output:
$ git commit
djhtml...................................................................Failed
- hook id: djhtml
- files were modified by this hook
reindented template.html
1 template has been reindented.
To inspect the changes that were made, use git diff. If you are
happy with the changes, you can commit them normally. If you are not
happy, please do the following:
-
Run
SKIP=djhtml git committo commit anyway, skipping thedjhtmlhook. -
Consider opening an issue with the relevant part of the input file that was incorrectly formatted, and an example of how it should have been formatted.
Your feedback for improving DjHTML is very welcome!
Development
Use your preferred system for setting up a virtualenv, docker environment, or whatever else, then run the following:
python -m pip install -e .[dev]
pre-commit install --install-hooks
Tests can then be run quickly in that environment:
python -m unittest discover -v
Or testing in all available supported environments and linting can be run
with nox:
nox
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