{{- $slug := .Get 0 -}}
{{- $appendixLetter := "" -}}
{{- $filename := "" -}}
{{- $found := false -}}
{{- $appendixPage := .Site.GetPage "99_appendix" -}}
{{- range $appendixPage.Pages -}}
    {{- if eq .Slug $slug -}}
        {{- $filename = .File.BaseFileName -}}
        {{- if hasPrefix "01" $filename -}}
            {{- $appendixLetter = "A" -}}
        {{- else if hasPrefix "02" $filename -}}
            {{- $appendixLetter = "B" -}}
        {{- end -}}
        {{- $found = true -}}
    {{- end -}}
{{- end -}}
{{- if not $found -}}
    {{- errorf "Appendix with slug '%s' not found" $slug -}}
{{- end -}}
{{- $href := cond .Site.Params.pdfgen (printf "#%s" $filename) (printf "99_appendix#%s" $filename | relURL) -}}
Appendix <a href="{{ $href }}">{{- $appendixLetter -}}</a>