Python-only static file (js, css) bundler for `edwh`
Project description
edwh-bundler-plugin
EDWH Python-only bundler for static assets (JS and CSS).
Try it out with an example:
edwh bundle.build --input example.yaml --verbose
Table of Contents
Installation
pip install edwh-bundler-plugin
But probably you want to install the whole edwh package:
pipx install edwh[bundler]
# or
pipx install edwh[plugins,omgeving]
Usage
After setting up a correct bundle.yaml, simply run `edwh bundle.build' to build your JS and CSS bundles!
JS
Since this package is Python-only, it can't do any of the more fancy stuff that nodejs-based bundlers can.
For simplistic purposes however, where the bundler is embedded in some other Python workflow, this package could be
useful.
It can combine JS files (in a naive way) and minify them using rjsmin.
In addition to this, it can also add _hyperscript to the bundle and 'minify' it (by removing
comments and newlines).
These JS and _hs files can be fetched from a remote URL or loaded from a file path.
CSS files can be also included in the bundle, and will be inlined as <style>s in the page's head.
The same goes for HTML files, which will be appended to the end of the <body> (useful for <template>s).
Typescript files can now also be bundled, using dukpy.
Basic imports should work thanks to a custom resolver, but this hasn't been tested with anything complex such
as node_modules yet.
CSS
(S)CSS can also be bundled (naively) and minified (using libsass) and can also be loaded from either remote or local files. A scope can also be defined and using sass all styles in the file will be prefixed with the provided selector.
Configuration
A bundle with a specific configuration can be built with: edwh bundle.build --input some.yaml.
If no --input is defined, bundle.yaml in the current directory will be used.
This yaml can contain these keys:
js:
- ... # list of resources
css:
- ... # list of resources
config:
minify: bool # should the outputs be minified?
cache: bool # should CDN resources be cached locally?
hash: bool # should a .hash file be created in addition to the output files?
# - and _ are interchangable in variable names:
version: 1.2.3 # default: 'latest'
output-css: static/css/$filename-$version.css # where should the css be stored?
output_js: static/js/$filename-$version.js # where should the js be stored?
scss-variables: # will be available for all .scss files
- variables.toml # from a toml, json, yaml file
- https://my.site/api/styles.json?secret=${AUTH_TOKEN} # or from a remote file
# extra variables, available via $varname (e.g. see output-css)
filename: bundled
js contains input files for the JS bundle, css input files for the CSS bundle and config contains general
configuration options.
JS
The JS part of the configuration has the following options:
js:
- https://some.cdn/mypackage.js # remote JS file
- ./path/to/file.js # local JS file
- https://some.cdn/mypackage._hs # remote hyperscript file
- /path/to/file._hs # local hyperscript file
- >
// inline JavaScript (requires starting with a comment so the bundler can detect it)
console.log("inline multiline js")
- _hyperscript("log 'inline hyperscript'") # if you've included 'hyperscript' from a file or cdn above! Tip: alias `_ = _hyperscript` for ease of use)
- https://some.cdn/mystyles.css # remote CSS (will be inlined in the head)
- path/to/styles.css # local CSS (will be inlined in the head)
- path/to/template.html # will be added to the end of the DOM
SCSS is not supported in this section.
CSS
css:
- https://some.cdn/mystyles.scss # remote SCSS
- https://some.cdn/mystyles.css # remote CSS
- path/to/styles.scss # local SCSS
- path/to/styles.css # local CSS
- file: url_or_path.css # dict with options:
scope: '#my-style-scope' # every rule in this file will be scoped
- file: url_or_path.css # transform a .css file with sass
scss: 1
- |
// inline scss or css
- file: url_or_path.scss
variables: # extra SCSS variables
primary: "#000033"
secondary: "green"
width: "20px"
- file: url_or_path.scss
variables: # one or more files with variables:
- variables.toml # local configuration file (toml, yaml, json, ...)
- https://my.site/api/settings.json?secret=${APIKEY} # remote config file with .env setting for auth
SCSS will be applied if the file extension is sass or scss or if the scss option is true.
SCSS will be disabled for files with that extension if the config option is set to false.
The scope selector can be any CSS selector (e.g. #id, .class, element etc.)
The scope and scss options do not work together, as scope always uses scss to add the parent selector.
Multiple Configurations
You can define multiple configurations within a single config file to handle different output needs, such as minified and unminified versions. Shared assets like JavaScript and CSS files can be defined once and reused across different configurations. Example:
# bundle-multiple.yaml
shared:
js: &shared_js
- $input_css/example.ts
- $input_css/main2.ts
css: &shared_css
- $input_css/example.sass
configurations:
minified:
js: *shared_js
css: *shared_css
config:
minify: 1
output_js: static/js/bundled.min.js
output_css: static/css/bundled.min.css
unminified:
js: *shared_js
css: *shared_css
config:
minify: 0
output_js: static/js/bundled.js
output_css: static/css/bundled.css
To compile only one of the configurations in a file, you can use --name:
edwh bundle.build --config bundle-multiple.yaml --name minified
CLI Config
The config options from the config file can be overridden on the command line with the corresponding flags (
see edwh bundle.build -h).
Booleans such as minify and cache can start with 1, 'y' or 't' (e.g. be 1, 'y', 'Y', 'Yes', 'yup', 'true' or
something similar) to be truthy.
Anything else is considered falsey. The flag --stdout can only be used from the commandline, and will yield the result
to stdout instead of an output file (overrides --output)
Other commands
edwh bundle.build-js or edwh bundle.build-css can be used to only build one output file (.js or .css respectively).
These commands can be used with multiple --files as arguments. The rest of the options are the same as the
regular build.
Integrated use as an API
Instead of using the cli, this package can also be integrated in other Python scripts.
# individual helpers
from edwh_bundler_plugin import extract_contents_for_js
from edwh_bundler_plugin import extract_contents_for_css
extract_contents_for_css("https://some.cdn/mystyles.css") # a {color: red}
extract_contents_for_js("https://some.cdn/mystyles.css") # document.head.innerHTML += `<style>a {color: red}</style>`
extract_contents_for_css(
{'file': "https://some.cdn/assets/css/mystyles.css", 'scope': '#mydiv'}) # #mydiv a {color: red}
# bundling multiple files
from edwh_bundler_plugin import bundle_js, bundle_css
inline_js = """// should start with a comment
_ = _hyperscript
"""
bundle_js(["https://unpkg.com/hyperscript.org", inline_js, "_(`log 'inline _hs'`)"]) # returns a string by default
bundle_css(
["https://some.cdn/package.css", {'file': "./mystyles.css", 'scope': '#mydiv'}]) # returns a string by default
License
edwh-bundler-plugin is distributed under the terms of the MIT license.
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