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tpl: Rework to handle both text and HTML templates

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Before this commit, Hugo used `html/template` for all Go templates.

While this is a fine choice for HTML and maybe also RSS feeds, it is painful for plain text formats such as CSV, JSON etc.

This commit fixes that by using the `IsPlainText` attribute on the output format to decide what to use.

A couple of notes:

* The above requires a nonambiguous template name to type mapping. I.e. `/layouts/_default/list.json` will only work if there is only one JSON output format, `/layouts/_default/list.mytype.json` will always work.
* Ambiguous types will fall back to HTML.
* Partials inherits the text vs HTML identificator of the container template. This also means that plain text templates can only include plain text partials.
* Shortcode templates are, by definition, currently HTML templates only.

Fixes #3221
This commit is contained in:
Bjørn Erik Pedersen 2017-03-27 20:43:49 +02:00
parent 73c1c7b69d
commit 5c5efa03d2
31 changed files with 1208 additions and 840 deletions
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24
hugolib/page_output.go
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@ -110,9 +110,29 @@ func (p *PageOutput) Render(layout ...string) template.HTML {
l, err := p.layouts(layout...)
if err != nil {
helpers.DistinctErrorLog.Printf("in .Render: Failed to resolve layout %q for page %q", layout, p.pathOrTitle())
return template.HTML("")
return ""
}
return p.s.Tmpl.ExecuteTemplateToHTML(p, l...)
for _, layout := range l {
templ := p.s.Tmpl.Lookup(layout)
if templ == nil {
// This is legacy from when we had only one output format and
// HTML templates only. Some have references to layouts without suffix.
// We default to good old HTML.
templ = p.s.Tmpl.Lookup(layout + ".html")
}
if templ != nil {
res, err := templ.ExecuteToString(p)
if err != nil {
helpers.DistinctErrorLog.Printf("in .Render: Failed to execute template %q for page %q", layout, p.pathOrTitle())
return template.HTML("")
}
return template.HTML(res)
}
}
return ""
}
func (p *Page) Render(layout ...string) template.HTML {