CLI to process jinja (jinja2) templates in a directory tree
Project description
jinja-tree
What is it?
jinja-tree
is a CLI utility to process jinja (jinja2) templates
recursively in a directory tree.
It is very configurable and very easy to extend with its included plugin system.
The default behavior is to recursively search for files with a given extension (.template
for example) and to process the context with Jinja (Jinja2) templates engine reading the context variables from:
- a configuration file
- environment variables
- dotenv files
Then, the processed content is written into another file with the same name/path but with the configured extension (.template
by default) removed. The original file can also be deleted (but this is not the default behavior).
Full example about overall operation (in default mode)
Note: this is only the default behavior as you can tune this with your own plugins!
Let's imagine the following directory structure:
/foo/
/foo/README.md.template
/foo/bar/baz.py.template
/foo/bar/another.file
And execute jinja-tree /foo
with the default configuration.
We get:
/foo/
/foo/README.md.template
/foo/README.md <= NEW FILE FROM README.md.template jinja2 processing
/foo/bar/baz.py.template
/foo/bar/baz.py <= NEW FILE FROM baz.py.template jinja2 processing
/foo/bar/another.file
What's it for?
Your imagination is your limit 😅 but it's very useful for maintaining DRY documentation (for example your-cli --help
output automatically updated in a markdown file), configuration files with default values read in code, including common blocks in different files...
So it's a great tool for maintaining repositories in general.
[!TIP] Do you cant real-life examples? You can find some details about how we use it in this repository for:
[!NOTE] Another "action" plugin will be soon 🕒 provided to bootstrap directory trees from templates (like with the cookiecutter project).
Features
1️⃣ Easy to extend
jinja-tree
includes a plugin system. You can override the default behavior with your own plugins.
There are two extension points:
- context plugins: to provide context variables to Jinja templates
- file plugins: to change the way how
jinja-tree
finds files to process (including target files)
See this specification documentation page for more details.
2️⃣ Very configurable
jinja-tree
is very configurable. You can configure global options via CLI options or a configuration file.
Plugins are configurable via the configuration file.
See this specification documentation page for more details.
3️⃣ Embedded extensions
jinja-tree
includes some extensions to Jinja templates engine:
- to execute some commands (and get the corresponding output)
- to parse JSON strings into Python objects)
- ..
Usage examples
shell
extension
{{ "date"|shell() }}
=> will render something like: Sun Jan 28 15:11:44 CET 2024
from_json
extension
export MYENV='["foo", "bar", "baz"]'
(
cat <<EOF
{% for item in MYENV|from_json() -%}
- {{ item }}
{% endfor %}
EOF
) | jinja-stdin
=> will render something like:
- foo
- bar
- bar
See this directory for others
4️⃣ Full Jinja / Jinja2 support (including "includes" and "inheritance")
jinja-tree
has several options for Jinja "search paths". So you can use Jinja "includes" and "inheritance" features.
Installation
pip install jinja-tree
[!TIP] If you want to get a better readability of
jinja-tree
output (colors...), you can also usepip install rich
to install this optional dependency.
[!NOTE] A docker image is also available. You can use it to avoid any specific installation. See at the end of the "Usage" section for more details.
Usage
Main CLI
jinja-tree .
[!NOTE] The
.
in the previous command in the "root directory" (the directoryjinja-tree
will explore recursively to find files to process). You can replace it with any directory you want. By using.
, you will process all files in the current directory and its subdirectories.
Main CLI options
Usage: jinja-tree [OPTIONS] ROOT_DIR
Process a directory tree with the Jinja / Jinja2 templating system.
Arguments:
ROOT_DIR root directory [required]
Options:
--config-file TEXT config file path (default: first '.jinja-
tree.toml' file found up from current
working dir), can also be see with
JINJA_TREE_CONFIG_FILE env var [env var:
JINJA_TREE_CONFIG_FILE]
--log-level TEXT log level (DEBUG, INFO, WARNING or ERROR)
[default: INFO]
--verbose / --no-verbose increase verbosity of the DEBUG log level
(note: this forces log-level = DEBUG)
[default: no-verbose]
--extra-search-path PATH Search path to jinja (can be used multiple
times)
--add-cwd-to-search-path / --no-add-cwd-to-search-path
add current working directory (CWD) to jinja
search path
--add-root-dir-to-search-path / --no-add-root-dir-to-search-path
add root directory to jinja search path
--jinja-extension TEXT jinja extension to load
--context-plugin TEXT context plugins (full python class path, can
be used multiple times)
--action-plugin TEXT action plugin (full python class path, can
be used multiple times)
--strict-undefined / --no-strict-undefined
if set, raise an error if a variable does
not exist in context
--blank-run / --no-blank-run if set, execute a blank run (without
modifying or deleting anything) [default:
no-blank-run]
--disable-embedded-jinja-extensions / --no-disable-embedded-jinja-extensions
disable embedded jinja extensions
--help Show this message and exit.
Bonus CLI (if you want to process only one file but with the same behavior)
cat /path/to/your/file/to/process | jinja-stdin >/path/to/your/processed/file
or (if you want to process only a string):
$ export FOO=bar
$ echo "Hello {{FOO}}" | jinja-stdin
Hello bar
Bonus CLI options
Usage: jinja-stdin [OPTIONS]
Process the standard input with Jinja templating system and return the
result on the standard output.
Options:
--config-file TEXT config file path (default: first '.jinja-
tree.toml' file found up from current
working dir), can also be see with
JINJA_TREE_CONFIG_FILE env var [env var:
JINJA_TREE_CONFIG_FILE]
--log-level TEXT log level (DEBUG, INFO, WARNING or ERROR)
[default: INFO]
--verbose / --no-verbose increase verbosity of the DEBUG log level
(note: this forces log-level = DEBUG)
[default: no-verbose]
--extra-search-path PATH Search path to jinja (can be used multiple
times)
--add-cwd-to-search-path / --no-add-cwd-to-search-path
add current working directory (CWD) to jinja
search path
--jinja-extension TEXT jinja extension to load
--context-plugin TEXT context plugins (full python class path, can
be used multiple times)
--strict-undefined / --no-strict-undefined
if set, raise an error if a variable does
not exist in context
--disable-embedded-jinja-extensions / --no-disable-embedded-jinja-extensions
disable embedded jinja extensions
--help Show this message and exit.
Docker image
A docker image is also available. You can use it this way:
docker run -t -v $(pwd):/workdir --user=$(id -u) ghcr.io/fabien-marty/jinja-tree:latest /workdir
(we mount the current directory in the /workdir
directory in the container and execute jinja-tree
in this /workdir
directory)
[!WARNING] If you plan to use environment variables with the docker image, you will have to use (possibly multiple times) the
-e VAR=VALUE
option to pass them to the container. With docker, it's more practical to use a.env
(dotenv) file as it will be automatically mounted in the container.
If you want to add some CLI options, you can add them like in this example:
docker run -t -v $(pwd):/workdir --user=$(id -u) ghcr.io/fabien-marty/jinja-tree:latest --verbose /workdir
(we added --verbose
just before the /workdir
argument)
If you want to use the `jinja-stdin` CLI with docker?
echo "FOO {{ BAR }}" |docker run -i -v $(pwd):/workdir -e BAR=BAZ --user=$(id -u) --entrypoint jinja-stdin ghcr.io/fabien-marty/jinja-tree:latest
(it will output FOO BAZ
)
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