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I am having a problem controlling whitespace and still formatting html/template templates in a readable fashion. My templates look somthing like this:
layout.tmpl
{{define "layout"}}
<!DOCTYPE html>
<html>
<head>
<title>{{.title}}</title>
</head>
<body>
{{ template "body" . }}
</body>
</html>
{{end}}
body.tmpl
{{define "body"}}
{{ range .items }}
{{.count}} items are made of {{.material}}
{{end}}
{{end}}
code
package main
import (
"os"
"text/template"
)
type View struct {
layout string
body string
}
type Smap map[string]string
func (self View) Render(data map[string]interface{}) {
layout := self.layout + ".tmpl"
body := self.body + ".tmpl"
tmpl := template.Must(template.New("layout").ParseFiles(layout, body))
tmpl.ExecuteTemplate(os.Stdout, "layout", data)
}
func main() {
view := View{ "layout", "body" }
view.Render(map[string]interface{}{
"title": "stock",
"items": []Smap{
Smap{
"count": "2",
"material": "angora",
},
Smap{
"count": "3",
"material": "wool",
},
},
})
}
But that produces (note: there is a line above the doctype):
<!DOCTYPE html>
<html>
<head>
<title>stock</title>
</head>
<body>
2 items are made of angora
3 items are made of wool
</body>
</html>
What I want is:
<!DOCTYPE html>
<html>
<head>
<title>stock</title>
</head>
<body>
2 items are made of angora
3 items are made of wool
</body>
</html>
In other template languages I can say things like
[[- value -]]
and the whitespace before and after the action are stripped, but I don't see anything like that in html/template. Does this really mean I have to make my templates unreadable like the following?
layout.tmpl
{{define "layout"}}<!DOCTYPE html>
<html>
<head>
<title>.title</title>
</head>
<body>
{{ template "body" . }} </body>
</html>
{{end}}
body.tmpl
{{define "body"}}{{ range .items }}{{.count}} items are made of {{.material}}
{{end}}{{end}}
373
You can use white space controller
{{range .foos -}} // eats trailing whitespace
<tr><td>do something</td></tr>
{{- end}} // eats leading whitespace (\n from previous line)
Whitespace in this case makes no difference in the rendered output at the user's browser, so controlling it makes little sense above perhaps aesthetics.
Put differently, one can have nicely formatted templates (which I would prefer) or partially nicely formatted HTML (no nested indents). Pick one or post process the HTML using any of the existing formatters.
2
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