{{ $file := .Get "file" }}
{{ $id := .Get "id" | default "" }}
{{ $lang := .Get "lang" | default (path.Ext $file | strings.TrimPrefix ".") }}
{{ $hlLines := .Get "hl_lines" | default "" }}
{{ $lineAnchors := .Get "line_anchors" | default "" }}

{{ with $file | readFile }}
  {{ $snippet := . }}

  {{ if $id }}
    {{ $lines := split $snippet "\n" }}

    {{ $startTag := printf "START %s" $id }}
    {{ $endTag := printf "END %s" $id }}

    {{ $startl := -1 }}
    {{ $endl := -1 }}

    {{/* Find the lines that contain the start and end tags. */}}
    {{ range $index, $line := $lines }}
      {{ if hasSuffix $line $startTag }}
        {{ $startl = $index }}
      {{ else if hasSuffix $line $endTag }}
        {{ $endl = $index }}
      {{ end }}
    {{ end }}

    {{ if lt $startl 0 }}
      {{ errorf "Named snippet is missing START tag" }}
    {{ end }}

    {{ if lt $endl 0 }}
      {{ errorf "Named snippet is missing END tag" }}
    {{ end }}

    {{/* Size of the snippet in number of lines. */}}
    {{ $snippetLen := sub (sub $endl $startl) 1 }}

    {{/* Create slice with only the lines between the tags. */}}
    {{ $includedLines := first $snippetLen (after (add $startl 1) $lines) }}

    {{/* Join the lines into the final snippet. */}}
    {{ $snippet = delimit $includedLines "\n" }}
  {{ end }}

  {{/* Build the highlight options */}}
  {{ $highlightOpts := "lineNos=inline,anchorLineNos=true" }}
  {{ if $hlLines }}
    {{ $highlightOpts = printf "%s,hl_lines=%s" $highlightOpts $hlLines }}
  {{ end }}
  {{ if $lineAnchors }}
    {{ $highlightOpts = printf "%s,lineAnchors=%s" $highlightOpts $lineAnchors }}
  {{ end }}

  {{ highlight $snippet $lang $highlightOpts }}
{{ end }}