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hextra_mirror/layouts/_partials/head.html
Xin 7031718449 feat(math): add optional MathJax support (#707)
* feat: add MathJax option

* docs: move math engine note

* refactor: update LaTeX documentation and improve MathJax integration

- Adjusted LaTeX documentation for clarity and formatting.
- Enhanced MathJax configuration in the templates to support both KaTeX and MathJax rendering.
- Removed deprecated comments and streamlined the script loading process for MathJax.
- Updated the passthrough extension settings in the Hugo configuration for better compatibility with LaTeX math expressions.

* docs: simplify LaTeX documentation and clarify configuration steps

- Updated LaTeX documentation to reflect that KaTeX is enabled by default, removing the need for manual activation.
- Added examples for using LaTeX math expressions and clarified the configuration for the passthrough extension in Hugo.
- Enhanced MathJax section to emphasize its use as an alternative rendering engine.
2025-06-14 14:36:10 +01:00

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<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
{{- $noindex := .Params.noindex | default false -}}
{{ if and (hugo.IsProduction) (not $noindex) -}}
<meta name="robots" content="index, follow" />
{{ else -}}
<meta name="robots" content="noindex, nofollow" />
{{ end -}}
{{ partialCached "favicons.html" . -}}
<title>
{{- if .IsHome -}}
{{ .Site.Title -}}
{{ else -}}
{{ with .Title }}{{ . }} {{ end -}}
{{ .Site.Title -}}
{{ end -}}
</title>
<meta name="description" content="{{ partial "utils/page-description.html" . }}" />
{{- with .Params.canonical -}}
<link rel="canonical" href="{{ . }}" itemprop="url" />
{{- else -}}
<link rel="canonical" href="{{ .Permalink }}" itemprop="url" />
{{- end -}}
{{- partial "opengraph.html" . -}}
{{- partial "schema.html" . -}}
{{- partial "twitter_cards.html" . -}}
{{- $mainCss := resources.Get "css/compiled/main.css" -}}
{{- $customCss := resources.Get "css/custom.css" -}}
{{- $variablesCss := resources.Get "css/variables.css" | resources.ExecuteAsTemplate "css/variables.css" . -}}
{{- /* Production build */ -}}
{{- if hugo.IsProduction }}
{{- $styles := slice $variablesCss $mainCss $customCss | resources.Concat "css/compiled/main.css" | minify | fingerprint }}
<link rel="preload" href="{{ $styles.RelPermalink }}" as="style" integrity="{{ $styles.Data.Integrity }}" />
<link href="{{ $styles.RelPermalink }}" rel="stylesheet" integrity="{{ $styles.Data.Integrity }}" />
{{- /* Theme development mode (non-production + theme environment) */ -}}
{{- else if eq hugo.Environment "theme" }}
{{- $devStyles := resources.Get "css/styles.css" | postCSS (dict "inlineImports" true) }}
<link href="{{ $devStyles.RelPermalink }}" rel="stylesheet" />
<link href="{{ $variablesCss.RelPermalink }}" rel="stylesheet" />
<link href="{{ $customCss.RelPermalink }}" rel="stylesheet" />
{{- /* User local development */ -}}
{{- else }}
{{- $styles := resources.Get "css/compiled/main.css" -}}
<link href="{{ $styles.RelPermalink }}" rel="stylesheet" />
<link href="{{ $variablesCss.RelPermalink }}" rel="stylesheet" />
<link href="{{ $customCss.RelPermalink }}" rel="stylesheet" />
{{- end }}
<!-- Google Analytics -->
{{- if and hugo.IsProduction .Site.Config.Services.GoogleAnalytics.ID }}
<link rel="preconnect" href="https://www.googletagmanager.com" crossorigin />
{{ partial "google-analytics.html" . -}}
{{- end }}
<script>
/* Initialize light/dark mode */
const defaultTheme = '{{ site.Params.theme.default | default `system`}}';
const setDarkTheme = () => {
document.documentElement.classList.add("dark");
document.documentElement.style.colorScheme = "dark";
}
const setLightTheme = () => {
document.documentElement.classList.remove("dark");
document.documentElement.style.colorScheme = "light";
}
if ("color-theme" in localStorage) {
localStorage.getItem("color-theme") === "dark" ? setDarkTheme() : setLightTheme();
} else {
defaultTheme === "dark" ? setDarkTheme() : setLightTheme();
if (defaultTheme === "system") {
window.matchMedia("(prefers-color-scheme: dark)").matches ? setDarkTheme() : setLightTheme();
}
}
</script>
<!-- KaTeX-->
{{ $noop := .WordCount -}}
{{- $engine := site.Params.math.engine | default "katex" -}}
{{ if and (.Page.Store.Get "hasMath") (eq $engine "katex") -}}
<!-- TODO: make url configurable -->
{{ $katexBaseUrl := "https://cdn.jsdelivr.net/npm/katex@latest/dist" }}
{{ $katexCssUrl := printf "%s/katex%s.css" $katexBaseUrl (cond hugo.IsProduction ".min" "") -}}
{{ $katexFontPattern := "url(fonts/" }}
{{ $katexFontSubstituted := printf "url(%s/fonts/" $katexBaseUrl }}
{{ with try (resources.GetRemote $katexCssUrl) -}}
{{ with .Err -}}
{{ errorf "Could not retrieve KaTeX css file from %s. Reason: %s." $katexCssUrl . -}}
{{ else with .Value -}}
{{ $katexCssContent := strings.Replace .Content $katexFontPattern $katexFontSubstituted }}
{{ with resources.FromString (printf "css/katex%s.css" (cond hugo.IsProduction ".min" "")) $katexCssContent -}}
{{ $cssHash := . | fingerprint "sha512" -}}
<link rel="stylesheet" href="{{- .RelPermalink -}}" integrity="{{- $cssHash.Data.Integrity -}}" crossorigin="anonymous" />
{{ end -}}
{{ end -}}
{{ end -}}
{{ else if and (.Page.Store.Get "hasMath") (eq $engine "mathjax") -}}
{{ partialCached "scripts/mathjax.html" . -}}
{{ end -}}
{{ partial "custom/head-end.html" . -}}
</head>