A Python-Markdown extension which provides a simple syntax for including Bootstrap objects within a Markdown document.
To install the extension, run the following command:
pip install bootstrap4markdown
To use the extension, include its name in the list of extensions passed to Python-Markdown.
import markdown markdown.markdown(src, extensions=['bs4md'])
Note that this extension only generates the requisite HTML for the supported Bootstrap components. The user is responsible for providing the necessary CSS and Javascript for the Bootstrap theme being used. The generated HTML assumes Bootstrap version 5.3.
Bootstrap4Markdown is built on top of the Blocks extension. Therefore, all blocks use the same basic form.
/// name-of-block | argument
option: value
content
///
Therefore, each supported Bootstrap object maps to a specific block name as defined below.
Bootstrap based alerts can be defined using blocks named alert.
/// alert
This is an alert.
///
A title (or heading) can be defined using the block's argument.
/// alert | Title
This alert has a title.
///
The color of the alert can be altered using the type option. For example, setting type: warning will result in the alert-warning style being used from your Bootstrap theme.
/// alert | Warning
type: warning
This is a **warning** alert with a title.
///
Valid types are the string names of any of Bootstraps contextual classes: primary, secondary, success, danger, warning, info, light, and dark.
Notice that the body content body of the alert contains standard Markdown content. By default the content will be parsed as a single block (paragraph) and only inline level Markdown parsing will be applied to the content. However, if the markdown option is set to block, then block-level parsing will be applied to the content as well.
/// alert
markdown: block
This alert contains two paragraphs of Markdown text.
This is the second paragraph.
///
An alert will include a dismiss button if dismissable is set to true.
/// alert
dismissable: true
You can dismiss me!
///
Finally, any additional HTML attributes can be defined for the outer element of the alert using the attrs option.
/// alert
attrs:
id: mycustomid
class: p-5
Custom padding is set for this alert using on of Bootstraps'
[spacing](https://getbootstrap.com/docs/5.3/utilities/spacing/)
classes. (`p-5`).
///
type string A string which matches one of Bootstrap's contextual classes. primary dismissable boolean Enable or disable a dismiss button. false markdown string Indicate whether body content should be parsed as block or inline content. inline attrs key:value pairs Define custom HTML attributes for the wrapping element. {}
A Bootstrap based carousel (or slideshow) can be defined using two types of blocks: the outer carousel block and a separate slide block for each component of the slideshow.
//// carousel
/// slide | image1.jpg
alt: Slide one.
///
/// slide | image2.jpg
alt: Slide two.
///
////
Note that all slide blocks must be nested in a carousel block. Also, be sure to use a different number of slashes for the parent carousel block than the child slide blocks.
The outer carousel block is used to define global options which apply to the entire slideshow.
//// carousel
attrs: {id: 'mycustomid'}
controls: false
indicators: true
fade: true
autoplay: carousel
touch: false
...
////
controls boolean Display previous/next buttons. true indicators boolean Display indicators to jump to a specific slide. false fade boolean Enable a crossfade transition between slides. false autoplay boolean or string Enable autoplay. Set to carousel to autoplay on page load or true to autoplay after first interaction. false attrs key:value pairs Define custom HTML attributes for the wrapping carousel element. {}
Note that Boostrap requires each carousel to have a unique id defined for it to work correctly. If one is not defined in the attrs, then a random UUID string will be generated and assigned as the id of the carousel.
Nested within the carousel block, each slide is defined by a slide block. Slides may take one of a few forms. The simplest form is an image.
///
slide | path/to/image.jpg
alt: Some alt text for the image.
///
Note that the path to the image is defined in the argument and the alt text in the alt option.
Image slides can also define a caption, which is text that overlays the image. The caption is defined in the body of the image.
///
slide | path/to/image.jpg
alt: Some alt text for the image.
# Caption Title
Caption Body.
///
However, if no argument is provided, then the body content is used as the body of the slide. In both cases, Markdown processing is applied to the body content.
/// slide
attrs: {class: 'text-center pt-5 bg-primary-subtle text-primary-emphasis min-vh-100'}
# HTML Slide
Slide Body
///
Note that various Bootstrap classes were set on the above slide. As Bootstrap's documentation explains:
Carousels don’t automatically normalize slide dimensions. As such, you may need to use additional utilities or custom styles to appropriately size content.
Of course, raw HTML can be used as well. For example, the following slide includes a slide comprised of an SVG element.
/// slide
markdown: inline
<svg class="d-block w-100" width="800" height="400" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Placeholder" preserveAspectRatio="xMidYMid slice" focusable="false">
<title>Placeholder</title>
<rect width="100%" height="100%" fill="#777"></rect>
<text x="50%" y="50%" fill="#555" dy=".3em">SVG Slide</text>
</svg>
///
In the above slide, the markdown option was set to inline so that the svg would not be wrapped in a Markdown paragraph. However, when using block-level raw HTML, you will want to indent the content one level (4 spaces) and set the markdown option to raw to ensure that Markdown parsing does not muck up your custom crafted HTML.
/// slide
markdown: raw
<h4>Title</h4>
<p>Custom Body Content</p>
///
alt string Alt text for an image slide. Ignored for none-image slides. '' active boolean Set this slide to be the active slide. false interval integer or null Number of seconds to display slide when autoplaying. Set to null to use Bootstrap's default. null markdown string Indicate whether body or caption content should be parsed as block, inline, or raw content. block. attrs key:value pairs Define custom HTML attributes for the slide element. {}
Note that if more that one slide is set to active: true, then only the first of all "active" slides is actually set to active. If no slides are explicitly set to be active, then the first slide in the carousel is set to be active by default.
The Bootstrap4Markdown Extension to Python-Markdown is licensed under the MIT License as defined in LICENSE.
The initial release. Includes support for Alerts and Carousels.
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