Hexo-Highlight-Shiki

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A hexo plugin to use Shiki as code block highlighter.

Hexo v7.0.0+ is required.

Features

• Use Shiki to render code blocks, and the format is similar to Hexo's default code highlighting (so you don't need to make significant changes to the theme you are currently using).
• Support switching between multiple themes (you need to write the corresponding styles and scripts yourself).
• Support custom language.
• Support custom theme.
• Support transformers in @shikijs/transformers.

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

and use

hexo clean && hexo generate

to enjoy code highlighting powered by Shiki.

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.
    - "example1" # You can omit `name` and `option` when no options are required, directly using the string.
    - name: example2 # When additional option are required, please explicitly set name and option.
      option:
      # Options for the transformer, please check the @shikijs/transformer's source code to get the list of supported options
      # Source code of @shikijs/transformer: https://github.com/shikijs/shiki/tree/main/packages/transformers/src/transformers
        exampleOption1: exampleValue1
        exampleOption2: exampleValue2
  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

For example, if you want to mark some lines, you can use Hexo's code block tag plugin (which has been adapted by this plugin):

{% codeblock lang:rust mark:2 %}
fn main() {
    println!("Hello, world!");
}
{% endcodeblock %}

But if you want to mark some lines in backtick code blocks, you can use transformer:

transformers:
  - name: transformerNotationHighlight
    option:
      classActiveLine: marked # same to Hexo's code block tag marked line's class, default: highlighted
      classActivePre: has-marked # default: has-highlighted

and add some comment to your code block:

```rust
fn main() {
    println!("Hello, world!"); // [!code highlight]
}
```

The result is the same as the Hexo code block tag plugin.

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.

Related Issues:

• Error in applying html the markdown file #26
• Can't find handler for document #265

Acknowledgments

This plugin is developed based on

• ArcticLampyrid/hexo-shiki-highlighter
• nova1751/hexo-shiki-plugin