Michael Stapelberg
100 lines
4.0 KiB
Go Template
100 lines
4.0 KiB
Go Template
{{- /* 1. set standard effects */}}
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{{- $effects := dict "border" false "dataurl" false "inlinecontent" false "lazy" true "lightbox" true "shadow" false "left" false "right" false "inline" false }}
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{{- $attributes := .attributes | default dict }}
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{{- /* 2. stack configured site effects */}}
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{{- if .page.Site.Params.imageeffects }}
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{{- $effects = merge $effects .page.Site.Params.imageeffects }}
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{{- end }}
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{{- /* 3. stack pages frontmatter effects */}}
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{{- if .page.Params.imageeffects }}
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{{- $effects = merge $effects .page.Params.imageeffects }}
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{{- end }}
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{{- /* 4. stack URL query parameter */}}
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{{- $height := "auto" }}
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{{- $width := "auto" }}
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{{- $u := urls.Parse .url }}
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{{- if $u.RawQuery }}
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{{- /* 4.1 stack "classes" parameter effects; handle "no" prefix */}}
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{{- if $u.Query.Has "classes" }}
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{{- $classes := slice | append (split ($u.Query.Get "classes") ",") }}
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{{- range $classes }}
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{{- $k := . }}
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{{- if isset $effects $k }}
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{{- $v := true }}
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{{- if strings.HasPrefix $k "no" }}
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{{- $k := strings.TrimPrefix "no" $k }}
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{{- $v := false }}
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{{- end }}
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{{- $effects = merge $effects (dict $k $v) }}
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{{- end }}
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{{- end }}
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{{- end }}
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{{- /* 4.2 stack other effect parameter; no handling for "no" prefix */}}
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{{- range $k, $v := $effects }}
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{{- if $u.Query.Has $k }}
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{{- $paramValue := $u.Query.Get $k }}
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{{- $newValue := true }}
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{{- if eq $paramValue "" }}
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{{- $newValue = true }}
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{{- else if eq $paramValue "true" }}
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{{- $newValue = true }}
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{{- else if eq $paramValue "false" }}
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{{- $newValue = false }}
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{{- else }}
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{{- $newValue = $paramValue }}
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{{- end }}
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{{- $effects = merge $effects (dict $k $newValue) }}
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{{- end }}
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{{- end }}
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{{- /* 4.3 special case parameter */}}
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{{- if $u.Query.Has "featherlight" }}
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{{- $filepath := "[virtual file]" }}{{ with and .page .page.File .page.File.Filename }}{{ $filepath = . }}{{ end }}
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{{- warnf "%q: DEPRECATED usage of 'featherlight' image CSS class found, use 'lightbox' instead; see https://mcshelby.github.io/hugo-theme-relearn/introduction/releasenotes/5/#5-11-0" $filepath }}
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{{- $attributes = merge $attributes (dict "lightbox" (ne ($u.Query.Get "featherlight") "false")) }}
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{{- end }}
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{{- with $u.Query.Get "height" }}
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{{- $height = . }}
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{{- end }}
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{{- with $u.Query.Get "width" }}
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{{- $width = . }}
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{{- end }}
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{{- end }}
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{{- /* manually translate effects to HTML attributes */}}
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{{- /* "class" should only contain boolean effects if they are true */}}
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{{- $classes := slice }}
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{{- range $k, $v := $effects }}
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{{- if $v }}
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{{- if eq (printf "%T" $v) "bool" }}
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{{- $classes = $classes | append $k }}
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{{- end }}
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{{- end }}
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{{- end }}
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{{- if $attributes.class }}{{ $classes = $classes | append (split $attributes.class " ") }}{{ end }}
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{{- $classes = delimit $classes " " }}
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{{- $attributes = merge $attributes (dict "class" $classes ) }}
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{{- $styles := slice (printf "height: %s" $height) (printf "width: %s" $width) }}
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{{- if $attributes.style }}{{ $styles = $styles | append (split $attributes.style ";") }}{{ end }}
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{{- $styles = delimit $styles ";" }}
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{{- if $styles }}{{ $styles = print $styles ";" }}{{ end }}
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{{- $attributes = merge $attributes (dict "style" $styles) }}
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{{- if and .linkObject $effects.inlinecontent (eq .linkObject.MediaType.Type "image/svg+xml") }}
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{{- $content := .linkObject.Content | replaceRE `(?s)^\s*<\?.*?\?>\s*` "" }}
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{{- $attributes = merge $attributes (dict "content" $content) }}
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{{- else if and .linkObject $effects.dataurl }}
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{{- $src := printf "data:%s;base64,%s" .linkObject.MediaType.Type (.linkObject.Content | base64Encode) }}
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{{- $attributes = merge $attributes (dict "src" $src) }}
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{{- else }}
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{{- $attributes = merge $attributes (dict "src" .url) }}
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{{- if $effects.lazy }}{{ $attributes = merge $attributes (dict "loading" "lazy") }}{{ end }}
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{{- end }}
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{{- return $attributes }} |