Highlight

The highlight shortcode renders your code with a syntax highlighter.

1print("Hello World!")

Usage

This shortcode is compatible with Hugo’s highlight shortcode but offers some extensions.

You can call it interchangeably in the same way as Hugo’s own shortcode using positional parameter or by simply using codefences.

You are free to also call this shortcode from your own partials. In this case it somewhat resemble Hugo’s highlight function syntax if you call this shortcode as a partial using compatiblity syntax.

While the examples are using shortcodes with named parameter it is recommended to use codefences instead. This is because more and more other software supports codefences (eg. GitHub) and so your markdown becomes more portable.

```py { lineNos="true" wrap="true" }
print("Hello World!")
```

{{< highlight lineNos="true" type="py" wrap="true" >}}
print("Hello World!")
{{< /highlight >}}

{{< highlight py "lineNos=true,wrap=true" >}}
print("Hello World!")
{{< /highlight >}}

{{ partial "shortcodes/highlight.html" (dict
  "page"    .
  "content" "print(\"Hello World!\")"
  "lineNos" "true"
  "type"    "py"
  "wrap"    "true"
)}}

{{ partial "shortcodes/highlight.html" (dict
  "page"    .
  "content" "print(\"Hello World!\")"
  "options" "lineNos=true,wrap=true"
  "type"    "py"
)}}

Parameter

Name	Default	Notes
type	<empty>	The language of the code to highlight. Choose from one of the supported languages. Case-insensitive.
wrap	see notes	Extension. When `true` the content may wrap on long lines otherwise it will be scrollable. The default value can be set in your `config.toml` and overwritten via frontmatter. See below.
options	<empty>	An optional, comma-separated list of zero or more Hugo supported options as well as extension parameter from this table.
<option>	<empty>	Any of Hugo’s supported options.
<content>	<empty>	Your code to highlight.

Configuration

Default values for Hugo’s supported options can be set via goldmark settings in your config.toml

Default values for extension options can be set via params settings in your config.toml or be overwritten by frontmatter for each individual page.

Global Configuration File

Recommended Settings

[markup]
  [markup.highlight]
    # line numbers in a table layout will shift if code is wrapping, so better
    # use inline; besides that visually both layouts have the same look and behavior
    lineNumbersInTable = false

    # if `guessSyntax = true`, there will be no unstyled code even if no language
    # was given BUT Mermaid and Math codefences will not work anymore! So this is a
    # mandatory setting for your site if you want to use Mermaid or Math codefences
    guessSyntax = false

    # the shipped variants come with their own modified chroma syntax highlightning
    # style which is imported in theme-relearn-light.css, theme-relearn-dark.css, etc.;
    # if you want to use a predefined style instead:
    # - remove `noClasses` or set `noClasses = true`
    # - set `style` to a predefined style name
    noClasses = false
    # style = "tango"

Optional Settings

[params]
  highlightWrap = true

Page’s Frontmatter

+++
highlightWrap = true
+++

Examples

Line Numbers

As mentioned above, line numbers in a table layout will shift if code is wrapping, so better use inline. To make things easier for you, set lineNumbersInTable = false in your config.toml and add lineNos = true when calling the shortcode instead of the specific values table or inline.

{{< highlight lineNos="true" type="py" >}}
# Quicksort Python One-liner
lambda L: [] if L==[] else qsort([x for x in L[1:] if x< L[0]]) + L[0:1] + qsort([x for x in L[1:] if x>=L[0]])
# Some more stuff
{{< /highlight >}}

1# Quicksort Python One-liner
2lambda L: [] if L==[] else qsort([x for x in L[1:] if x< L[0]]) + L[0:1] + qsort([x for x in L[1:] if x>=L[0]])
3# Some more stuff

With Wrap

{{< highlight type="py" wrap="true" hl_lines="2" >}}
# Quicksort Python One-liner
lambda L: [] if L==[] else qsort([x for x in L[1:] if x< L[0]]) + L[0:1] + qsort([x for x in L[1:] if x>=L[0]])
# Some more stuff
{{< /highlight >}}

# Quicksort Python One-liner
lambda L: [] if L==[] else qsort([x for x in L[1:] if x< L[0]]) + L[0:1] + qsort([x for x in L[1:] if x>=L[0]])
# Some more stuff

Without Wrap

{{< highlight type="py" wrap="false" hl_lines="2" >}}
# Quicksort Python One-liner
lambda L: [] if L==[] else qsort([x for x in L[1:] if x< L[0]]) + L[0:1] + qsort([x for x in L[1:] if x>=L[0]])
# Some more stuff
{{< /highlight >}}

# Quicksort Python One-liner
lambda L: [] if L==[] else qsort([x for x in L[1:] if x< L[0]]) + L[0:1] + qsort([x for x in L[1:] if x>=L[0]])
# Some more stuff