bobatheme/layouts/partials/post-meta-item/viewsource.html

{{ if and .Site.Params.gitFileURL .File.Path }}
    <span class="post-meta-item post-meta-view-source" aria-label="{{ i18n "aria_post_meta_view_source" }}">
        {{ with .Site.Params.gitFileIcon }}
            {{ partial "icon.html" . }}
        {{ else }}
            {{ partial "icon.html" "file" }}
        {{ end }}

        <a href="{{ printf "%s/content/%s" .Site.Params.gitFileURL .File.Path }}" target="_blank" rel="noopener">
            View source
        </a>
    </span>
{{ end }}