gokrazy/website/themes/hugo-theme-relearn/layouts/partials/shortcodes/tree.html

{{- $content := .content }}
{{- $content = replaceRE `^\s*\r?\n` "" $content }}
{{- $content = partial "inline/tree2markdown" $content }}
{{- $content = $content | .page.RenderString -}}
<div class="list-tree">
{{- $matches := findRESubmatch `<li>([\s\S]*?)(</li|<ul)` $content }}
{{- range $matches }}
  {{- $replacement := "" }}
  {{- $text := index . 1 }}
  {{- $rest := index . 2 }}
  {{- $parts := split $text "|" }}

  {{- if gt (len $parts) 1 }}
    {{- $name := trim (index $parts 0) " \t\n\r" }}

    {{- $style := "" }}
    {{- if ge (len $parts) 3 }}
      {{- $style = trim (index $parts 2) " \t\n\r" }}
    {{- end }}
    {{- $color := "" }}
    {{- $icon := trim (index $parts 1) " \t\n\r" }}
    {{- $boxStyle := partial "_relearn/boxStyle.gotmpl" (dict "mode" "tree" "style" $style "color" $color "icon" $icon) }}
    {{- $style = $boxStyle.style }}
    {{- $color = $boxStyle.color }}
    {{- $icon = $boxStyle.icon }}

    {{- if $color }}
      {{- $replacement = printf `<li><i class="%s" style="color: %s;"></i><span>%s</span>%s` $icon $color $name $rest }}
    {{- else if $style }}
      {{- $replacement = printf `<li><i class="%s %s cstyle"></i><span>%s</span>%s` $icon $style $name $rest }}
    {{- else }}
      {{- $replacement = printf `<li><i class="%s"></i><span>%s</span>%s` $icon $name $rest }}
    {{- end }}
  {{- end }}

  {{- if $replacement }}
    {{- $content = replace $content (index . 0) $replacement }}
  {{- end }}
{{- end }}
{{- $content | safeHTML -}}
</div>

{{- define "partials/inline/tree2markdown" }}
  {{- /* this parses native `tree` output into a Markdown list */}}
  {{- $content := . }}
  {{- $indentChars := slice " " "\t" }}
  {{- $treeColChars := slice "│" "├" "└" "─" }}
  {{- $indentPattern := "" }}
  {{- $treeColPattern := "" }}
  {{- $treeColPatternLen := 0 }}

  {{- $firstLine := true }}
  {{- $lines := split $content "\n" }}
  {{- range $lineIndex, $line := $lines }}
    {{- /* the first text line and all empty lines are skipped */}}
    {{- $skipLine := false }}
    {{- if not (trim $line " \t\r") }}
      {{- $skipLine = true }}
    {{- else if $firstLine }}
      {{- $firstLine = false }}
      {{- $skipLine = true }}
      {{- range split $line "" }}
        {{- if in $treeColChars . }}
          {{- $skipLine = false }}
          {{- break }}
        {{- end }}
      {{- end }}
    {{- end }}
    {{- if $skipLine }}
      {{- continue }}
    {{- end }}

    {{- if not $treeColPattern }}
      {{- /* for the first non-empty line we try to find out if it is a tree line and set prefix column pattern according to its column width */}}
      {{- range $char := (split $line "") }}
        {{- if and (not $treeColPattern) (in $indentChars $char) }}
          {{- $indentPattern = print $indentPattern "." }}
        {{- else if in $treeColChars $char }}
          {{- if $treeColPattern }}
            {{- $treeColPattern = print $treeColPattern "[─ ]" }}
            {{- $treeColPatternLen = add $treeColPatternLen 1 }}
          {{- else }}
            {{- $treeColPattern = print $treeColPattern "[│├└ ]" }}
            {{- $treeColPatternLen = add $treeColPatternLen 1 }}
          {{- end }}
        {{- else if eq " " $char }}
          {{- $treeColPattern = print $treeColPattern "[─ ]" }}
          {{- $treeColPatternLen = add $treeColPatternLen 1 }}
        {{- else }}
          {{- break }}
        {{- end }}
      {{- end }}
      {{- if not $treeColPattern }}
        {{- /* it is not a tree line so break processing at all and leave content unchanged */}}
        {{- break }}
      {{- end }}
      {{- /* it is a tree line so we reset the content and fill it by parsing next */}}
      {{- $content = "" }}
    {{- end }}

    {{- $linePattern := print `^` $indentPattern `((?:` $treeColPattern `)*)([^` (delimit $treeColChars "") `].*)` }}
    {{- range findRESubmatch $linePattern $line }}
      {{- $newline := "" }}
      {{- $rest := (index . 2) }}
      {{- $treePrefix := (index . 1) }}
      {{- $treePrefixLen := 0 }}
      {{- range (split $treePrefix "") }}
        {{- /* treeChars may contain Unicode chars which len messes up as it only counts bytes */}}
        {{- $treePrefixLen = add $treePrefixLen 1 }}
      {{- end }}
      {{- $treeLevel := div $treePrefixLen $treeColPatternLen }}
      {{- range seq $treeLevel }}
        {{- if eq . $treeLevel }}
          {{- /* last column needs its dash */}}
          {{- $newline = print $newline "- " }}
        {{- else }}
          {{- $newline = print $newline "  " }}
        {{- end }}
      {{- end }}
      {{- /* have seen some weird Windows output that puts in empty lines in the tree, so only write if we have prefix AND rest */}}
      {{- $rest = trim $rest " \t\r" }}
      {{- if and $newline $rest }}
        {{- $content = print $content $newline $rest "\n" }}
      {{- end }}
    {{- end }}
  {{- end }}
  {{- return $content }}
{{- end }}