Extemplate 
Extemplate is a small wrapper package around html/template to allow for easy file-based template inheritance.
File: templates/parent.tmpl
<html>
<head>
<title>{{ block "title" }}Default title{{ end }}</title>
</head>
<body>
{{ block "content" }}Default content{{ end }}
</body>
</html>
File: templates/child.tmpl
{{ extends "parent.tmpl" }}
{{ define "title" }}Child title{{ end }}
{{ define "content" }}Hello world!{{ end }}
File: main.go
xt := extemplate.New()
xt.ParseDir("templates/", []string{".tmpl"})
_ = xt.ExecuteTemplate(os.Stdout, "child.tmpl", "no data needed")
// Output: <html>.... Hello world! ....</html>
Extemplate recursively walks all files in the given directory and will parse the files matching the given extensions as a template. Templates are named by path and filename, relative to the root directory.
For example, calling ParseDir("templates/", []string{".tmpl"}) on the following directory structure:
templates/
|__ admin/
| |__ index.tmpl
| |__ edit.tmpl
|__ index.tmpl
Will result in the following templates:
admin/index.tmpl
admin/edit.tmpl
index.tmpl
Check out the tests and examples directory for more examples.
Benchmarks
You will most likely never have to worry about performance, when using this package properly. The benchmarks are purely listed here so we have a place to keep track of progress.
BenchmarkExtemplateGetLayoutForTemplate-8 2000000 923 ns/op 104 B/op 3 allocs/op
BenchmarkExtemplateParseDir-8 5000 227898 ns/op 34864 B/op 325 allocs/op
License
MIT
