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GitHub - flywire/caption

caption manages captions by applying style and auto-numbering to markdown content. It works on Figures, Tables and Other content such as Listings but is flexible and should work for nearly any content.

caption is a fork of yafg - yet another figure generator plugin for Python's Markdown. It's written and tested with Python 2.7 and Python 3.6 as well as Markdown 3.1.1, but aims at supporting as many versions as possible. If you encounter any problems with caption please raise an issue, or use the profile contact details.

The functionality is split into three separate python-maskdown plugins:

• image_captions for images
• table_captions for tables
• caption for general listings.

It uses the title attribute given to an image within Markdown to generate a <figure> environment with a <figcaption> containing the title's text, e.g.:

![Alt text](/path/to/image.png "This is the title of the image.")

becomes

<figure id="_figure-1">
<img alt="Alt text" src="/path/to/image.png" />
<figcaption><span>Figure&nbsp;1:</span> Captioned figure</figcaption>
</figure>

A paragraph starting with "Table" before a table is turned into a caption:

Table: Example with heading, two columns and a row

| Syntax      | Description |
| ----------- | ----------- |
| Header      | Title       |
| Paragraph   | Text        |

becomes

<table id="_table-1">
<caption><span>Table&nbsp;1:</span> Example with heading, two columns and a row</caption>
<thead>
<tr>
<th>Syntax</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>Header</td>
<td>Title</td>
</tr>
<tr>
<td>Paragraph</td>
<td>Text</td>
</tr>
</tbody>
</table>

Generic listings captioning is supported, using the "Listing: " prefix:

becomes

<div class="listing" id="_listing-1">
<figcaption><span>Listing&nbsp;1:</span> Example listing</figcaption>
</div>

caption can be installed via pip3 install git+https://github.com/flywire/caption

Python markdown extensions are incorporated into other applications.

MkDocs users can add caption to their generator process by adding it to the mkdocs.yml markdown_extensions section:

# ...
markdown_extensions:
  - image_captions:
      numbering: true
  - table_captions:
      numbering: true
      caption_top: false
  - caption
# ...

Python will parse input to Markdown with caption as follows:

import markdown
from caption import CaptionExtension, ImageCaptionExtension, TableCaptionExtension

# ...

outputString = markdown.markdown(
    input_string, extensions=[
        CaptionExtension(numbering=False),
        ImageCaptionExtension(),
        TableCaptionExtension(),
    ]
)

Currently supported options are listed below:

• caption_prefix:

  The text to show at the front of the caption. A final non-breaking space is inserted between the content of caption_prefix and the actual figure number.

• caption_match_re

  The regexp used to match captions from the markdown text. It can be used to match captions from multiple languages at once. The group(number) can match a optional number, see numbering_preserve. The group(title) needs to match the title.

• caption_skip_empty

  Whether empty captions should be skipped. This can be used for example to skip images that are used as icons (captions which have an empty title).

• numbering:

  Adds a caption number like "Figure 1:" in front of the caption. It's wrapped in a <span /> for easier styling.

• numbering_preserve

  This preserves a number captured to the group(number) using the caption_match_re option. If no number is present it falls back to the number generated from numbering option behaviour. It is not recommended to use preserved manual and automatic numbering at the same time in the markdown text, because of the conflict potential.

• content_class:

  The CSS class to add to the generated <content /> element.

• caption_class:

  The CSS class to add to the generated <caption /> element.

• caption_prefix_class:

  The CSS class to add to the <span /> element generated for the caption prefix.

• caption_top:

  Whether the caption should be on the top of the element.

The default values for each type of content is synthesised in the following table:

Captions are used on a range of content, not just figures. For figures, yafg arose from the dissatisfaction with the existing solutions, namely:

• markdown_captions which uses the alt attribute for the <figcaption>.
• markdown-figcap which uses a cryptic syntax that doesn't integrate well into Markdown, IMHO.
• figureAltCaption which cannot handle multi-line descriptions and uses the alt attribute for the <figcaption>.

Using the alt attribute to fill the <figcaption> is not correct as described in the standard (https://www.w3.org/wiki/Html/Elements/img).

[...] the alternative text is a replacement for the image, not a description [...]

for the most common case of a text accompanied by an augmenting image. It should be used for an exact reproduction of what can be seen on the image for those who cannot see it, for example because they're blind or their internet connection is too slow. A figure's caption in turn should provide a description helping to understand the content of the image.

The title attribute on the other hand should contain "advisory information associated with the element (W3C Core Attribute List). This is rather vague and often used by browser vendors to show tooltips containing the title. Since tooltips are highly problematic for a11y reasons and the browser support varies, "[r]elying on the title attribute is currently discouraged" (HTML Living Standard). This makes it an ideal candidate to store the wanted figcaption inside of the standard Markdown syntax.

caption fully supports CSS (Cascading Style Sheets) by adding tags to style your content. CSS can be placed against the image eg {: style="height:200px"}, in the settings eg: {: style="width: 100%"} or in a CSS file linked in the HTML eg .

figcaption span:first-child {
    font-weight: bold;
}

There are further examples in the wiki.

caption supports preserving attr_list extension supplied id and class attributes by:

• giving priority to markdown defined id attributes
• concatenating class attributes.

This samples shows how to create a captioned image with id and class through markdown attr_list extension.

![Alt text](/path/to/image.png "This is the title of the image."){ #title-image .test-class }

becomes

<figure id="_figure-1">
<img alt="Alt text" src="/path/to/image.png" id="title-image" class="test-class" />
    ...

This samples shows how to create a captioned table with id and class through markdown attr_list extension.

Table: Example with heading, two columns and a row
{#example-with-heading .test-class}

| Syntax      | Description |
| ----------- | ----------- |
| Header      | Title       |

becomes

<table id="example-with-heading" class="test-class table">
    ...

This samples shows how to create a generic caption with id and class through markdown attr_list extension.

Listing: Example listing
{ #example-listing .test-class }

becomes

<div class="listing test-class" id="example-listing">
<figcaption><span>Listing&nbsp;1:</span> Example listing</figcaption>
</div>

If the settings aren't flexible enough the source code can be changed and reinstalled. Many of the settings are easily identifiable in the source code and the the wiki has build instructions.

caption has been published under a GPL 3.0 or later license. See the LICENSE file for more information.

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