rodrigo moraes moraes

{{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}}

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.

	File "/[...]/webapp/admin.py", line 23, in get
	db.metadata.create_all()
	File "/[...]/webapp/sqlalchemy/schema.py", line 2784, in create_all
	tables=tables)
	File "/[...]/webapp/sqlalchemy/engine/base.py", line 1487, in _run_visitor
	conn._run_visitor(visitorcallable, element, **kwargs)
	File "/[...]/webapp/sqlalchemy/engine/base.py", line 1130, in _run_visitor
	**kwargs).traverse_single(element)
	File "/[...]/webapp/sqlalchemy/sql/visitors.py", line 111, in traverse_single
	return meth(obj, **kw)

	package foo

	import (
	"net/http"
	)

	type MethodHandler map[string]http.Handler

	func (h MethodHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	if handler, ok := h[req.Method]; ok {

	package test

	import (
	"net/http"

	"github.com/gorilla/template/v0"
	)

	func helloHandler(w http.ResponseWriter, r *http.Request) {
	set := template.Must(new(template.Set).Parse(`{{define "hello"}}Hello, world!{{end}}`))

	// A base template with the layout skeleton.
	// {{block}} actions define placeholders.
	{{define "base"}}
	<html>
	<head>
	<title>{{block "title"}}</title>
	</head>
	<body>
	{{block "content"}}
	</body>

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

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

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

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

	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.

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