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package htmlconv
import (
"html/template"
"io"
"tildegit.org/tjp/sliderule/gopher"
"tildegit.org/tjp/sliderule/gopher/gophermap/internal"
)
// Convert writes html to a writer from the provided gophermap document.
//
// Templates can be provided to override the output for different line types.
// The supported templates are:
// - "header' is called before any lines and is passed the full document.
// - "footer" is called after all lines and is passed the full document.
// - "message" is called for every group of consecutive info-message lines. It is
// passed a string of all the display components of the included lines, joined by
// newline characters.
// - "image" is called for all lines of any of the following types: GifFileType,
// ImageFileType, BitmapType, PngImageFileType. It is passed the gopher.MapItem.
// - "link" is called for all lines of any other type not yet mentioned, and is passed
// the gopher.MapItem.
//
// There are already default implementations of each of these templates, so the "overrides"
// argument can be nil or include just a subset of the supported templates.
func Convert(wr io.Writer, doc gopher.MapDocument, overrides *template.Template) error {
tmpl, err := baseTmpl.Clone()
if err != nil {
return err
}
tmpl, err = internal.AddHTMLOverrides(tmpl, overrides)
if err != nil {
return err
}
for _, item := range internal.RenderItems(doc) {
if err := tmpl.ExecuteTemplate(wr, item.Template, item.Object); err != nil {
return err
}
}
return nil
}
var baseTmpl = template.Must(template.New("htmlconv").Parse(`
{{ define "header" -}}
<!DOCTYPE html>
<html><body class="gophermap">
{{- end }}
{{ define "message" -}}
<pre class="gophermap">{{.}}
</pre>
{{- end }}
{{ define "link" -}}
<p class="gophermap"><a class="gophermap" {{ if .Hostname | and .Port }}href="gopher://{{.Hostname}}:{{.Port}}{{.Selector}}"{{ else }}href="{{.Selector}}"{{ end }}>{{.Display}}</a></p>
{{- end }}
{{ define "image" -}}
<p class="gophermap"><img class="gophermap" {{ if .Hostname | and .Port }}src="gopher://{{.Hostname}}:{{.Port}}{{.Selector}}"{{ else }}src="{{.Selector}}"{{ end }} alt="{{.Display}}"/></p>
{{- end }}
{{ define "footer" -}}
</body></html>
{{ end }}
`))
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