rodrigo moraes moraes

My crazy idea to overdo the convenience of template inheritance using composition

This idea will be patented soon. Go away, Apple.

TL;DR: Django created template inheritance and people thought it was awesome and everybody copied it. Go doesn't have it, people cried. We got an idea to make people happy again, without changing text/template syntax.

{{block}} in text/template

We can achieve what is known as "template inheritance" in other template engines using the {{block}} tag. A {{block}} is a replaceable fragment inside a template. Here's an example:

{{define "Base"}}

<p>A header</p>

{{block body}}

	package main

	import (
	"fmt"
	)

	type Node struct {
	Value int
	}

	package foo

	import (
	"reflect"

	"appengine"
	"appengine/datastore"
	)

	var (

	package main

	import (
	"encoding/gob"
	"net/http"
	"code.google.com/p/gorilla/sessions"
	"log"
	)

	var store = sessions.NewCookieStore([]byte("something-very-secret"))

	# Go
	export GOOS=linux
	export GOARCH=amd64
	export GOROOT=$HOME/dev/go
	export GOBIN=$GOROOT/bin
	export GOPATH=$HOME/dev/gopath

	export PATH=$PATH:$GOBIN

	import webapp2

	from webapp2_extras import local

	_local = local.Local()

	# The deferred handler instantiates webapp2.WSGIApplication in the module
	# globals, so when it is imported it ends resetting app globals.
	# To avoid this we duplicate the globals part of the WSGIApplication here,
	# knowing that only we will instantiate it.

	{{define "Master"}}
	<p>A header</p>
	{{template .body}}
	<p>A footer</p>
	{{end}}

	{{define "Hello"}}
	{{define "body"}}
	Hello, world!
	{{end}}

	{template Master}
	<p>A header</p>
	{call .body}
	<p>A footer</p>
	{end}

	{template Hello}
	{template body}
	<p>Hello, world!</p>
	{end}

	Node.js.....73,749
	Go.........286,483