Hexo-Highlight-Shiki

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A hexo plugin to use Shiki as code block highlighter.

Hexo v7.0.0+ is required.

Features

Render code block with Shiki like Hexo default highlighter.
Support dual or more themes.
Support custom language.

Installation and Configuration

First, install the plugin:

npm install hexo-highlighter-shiki --save

Then switch the code highlighting engine in your config.yml:

syntax_highlighter: shiki

Finally, configure shiki:

shiki:
  theme: github-dark # default: one-dark-pro
  line_number: true # default: false

Configuration Options

The complete configuration is as follows:

shiki:
  theme: one-dark-pro # Please refer to https://shiki.style/themes for supported themes.
  line_number: false # default: false
  strip_indent: true # default: true
  tab_replace: "  " # default: "  "
  pre_style: true # Preserve the style of the <pre> tag, i.e., the theme's `background-color`. default: true
  default_color: light # Only take effect when using multiple themes. default: light
  css_variable_prefix: --shiki- # Only take effect when using multiple themes. default: --shiki-
  transformers: # List of transformers to be enabled. Please refer to https://shiki.style/packages/transformers for the list of supported transformers.
    - "transformerNotationDiff" # You can omit name and option when no settings are required, directly using the string.
    - name: transformerNotationFocus # When additional option are required, please explicitly set name and option.
      option: # Options for the transformer, please check the transformer's source code to get the list of supported options
      # Source code of transformers: https://github.com/shikijs/shiki/tree/main/packages/transformers/src/transformers
        classActiveLine: focused
        classActivePre: has-focused
  additional:
    themes: # List of the TextMate theme json to be added.
      - path/to/theme.json
    langs: # List of the TextMate grammar json of languages to be added.
      - path/to/lang_grammar.json
    lang_alias: # List of the alias of languages.
      your_alias1: lang_name1
      your_alias2: lang_name2

Additionally, you can specify multiple themes in the theme option:

shiki:
  theme:
    light: one-light
    dark: one-dark-pro
    # ...

See Dual Themes for how to switch between multiple themes.

Bugs

mathjax

If you are using hexo-filter-mathjax or any other plugin that uses mathjax to render mathematical formulas locally, you may encounter an Error: Can't find handler for document when rendering articles that include code blocks and have mathjax rendering enabled. This is a problem with mathjax, as its LiteDOM adaptor cannot parse complex HTML fragments.

Solution

For example, if you are using the hexo-filter-mathjax plugin, modify the this line in the source code:

- data.content = mathjax(data.content);
+ data.content = data.content.replace(/<span\s+class="math\s+[^"]*">\\[\(\[].*?\\[\)\]]<\/span>/gs, mathjax);

This will prevent rendering errors for complex HTML fragments that result in Can't find handler for document.

Acknowledgments

This plugin is developed based on

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