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pongo2 is the successor of pongo, a Django-syntax like templating-language.

Install/update using go get (no dependencies required by pongo2):

go get -u github.com/flosch/pongo2

Please use the issue tracker if you're encountering any problems with pongo2 or if you need help with implementing tags or filters (create a ticket!). If possible, please use playground to create a short test case on what's wrong and include the link to the snippet in your issue.

New: Try pongo2 out in the pongo2 playground.

First impression of a template

<html><head><title>Our admins and users</title></head>
{# This is a short example to give you a quick overview of pongo2's syntax. #}

{% macro user_details(user, is_admin=false) %}
	<div class="user_item">
		<!-- Let's indicate a user's good karma -->
		<h2 {% if (user.karma >= 40) || (user.karma > calc_avg_karma(userlist)+5) %}
			class="karma-good"{% endif %}>
			
			<!-- This will call user.String() automatically if available: -->
			{{ user }}
		</h2>

		<!-- Will print a human-readable time duration like "3 weeks ago" -->
		<p>This user registered {{ user.register_date|naturaltime }}.</p>
		
		<!-- Let's allow the users to write down their biography using markdown;
		     we will only show the first 15 words as a preview -->
		<p>The user's biography:</p>
		<p>{{ user.biography|markdown|truncatewords_html:15 }}
			<a href="/user/{{ user.id }}/">read more</a></p>
		
		{% if is_admin %}<p>This user is an admin!</p>{% endif %}
	</div>
{% endmacro %}

<body>
	<!-- Make use of the macro defined above to avoid repetitive HTML code
	     since we want to use the same code for admins AND members -->
	
	<h1>Our admins</h1>
	{% for admin in adminlist %}
		{{ user_details(admin, true) }}
	{% endfor %}
	
	<h1>Our members</h1>
	{% for user in userlist %}
		{{ user_details(user) }}
	{% endfor %}
</body>
</html>

Development status

Latest stable release: v3.0 (go get -u gopkg.in/flosch/pongo2.v3 / v3-branch) [read the announcement]

Current development: v4 (master-branch)

Note: With the release of pongo v4 the branch v2 will be deprecated.

Deprecated versions (not supported anymore): v1

TopicStatus
Django version compatibility:1.7
Missing (planned) filters:none (hints)
Missing (planned) tags:none (hints)

Please also have a look on the caveats and on the official add-ons.

Features (and new in pongo2)

Recent API changes within pongo2

If you're using the master-branch of pongo2, you might be interested in this section. Since pongo2 is still in development (even though there is a first stable release!), there could be (backwards-incompatible) API changes over time. To keep track of these and therefore make it painless for you to adapt your codebase, I'll list them here.

How you can help

Documentation

For a documentation on how the templating language works you can head over to the Django documentation. pongo2 aims to be compatible with it.

You can access pongo2's API documentation on godoc.

Blog post series

Caveats

Filters

Tags

Misc

Add-ons, libraries and helpers

Official

3rd-party

Please add your project to this list and send me a pull request when you've developed something nice for pongo2.

API-usage examples

Please see the documentation for a full list of provided API methods.

A tiny example (template string)

// Compile the template first (i. e. creating the AST)
tpl, err := pongo2.FromString("Hello {{ name|capfirst }}!")
if err != nil {
	panic(err)
}
// Now you can render the template with the given 
// pongo2.Context how often you want to.
out, err := tpl.Execute(pongo2.Context{"name": "florian"})
if err != nil {
	panic(err)
}
fmt.Println(out) // Output: Hello Florian!

Example server-usage (template file)

package main

import (
	"github.com/flosch/pongo2"
	"net/http"
)

// Pre-compiling the templates at application startup using the
// little Must()-helper function (Must() will panic if FromFile()
// or FromString() will return with an error - that's it).
// It's faster to pre-compile it anywhere at startup and only
// execute the template later.
var tplExample = pongo2.Must(pongo2.FromFile("example.html"))

func examplePage(w http.ResponseWriter, r *http.Request) {
	// Execute the template per HTTP request
	err := tplExample.ExecuteWriter(pongo2.Context{"query": r.FormValue("query")}, w)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func main() {
	http.HandleFunc("/", examplePage)
	http.ListenAndServe(":8080", nil)
}

Benchmark

The benchmarks have been run on the my machine (Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz) using the command:

go test -bench . -cpu 1,2,4,8

All benchmarks are compiling (depends on the benchmark) and executing the template_tests/complex.tpl template.

The results are:

BenchmarkExecuteComplexWithSandboxActive                50000             60450 ns/op
BenchmarkExecuteComplexWithSandboxActive-2              50000             56998 ns/op
BenchmarkExecuteComplexWithSandboxActive-4              50000             60343 ns/op
BenchmarkExecuteComplexWithSandboxActive-8              50000             64229 ns/op
BenchmarkCompileAndExecuteComplexWithSandboxActive      10000            164410 ns/op
BenchmarkCompileAndExecuteComplexWithSandboxActive-2    10000            156682 ns/op
BenchmarkCompileAndExecuteComplexWithSandboxActive-4    10000            164821 ns/op
BenchmarkCompileAndExecuteComplexWithSandboxActive-8    10000            171806 ns/op
BenchmarkParallelExecuteComplexWithSandboxActive        50000             60428 ns/op
BenchmarkParallelExecuteComplexWithSandboxActive-2      50000             31887 ns/op
BenchmarkParallelExecuteComplexWithSandboxActive-4     100000             22810 ns/op
BenchmarkParallelExecuteComplexWithSandboxActive-8     100000             18820 ns/op
BenchmarkExecuteComplexWithoutSandbox                   50000             56942 ns/op
BenchmarkExecuteComplexWithoutSandbox-2                 50000             56168 ns/op
BenchmarkExecuteComplexWithoutSandbox-4                 50000             57838 ns/op
BenchmarkExecuteComplexWithoutSandbox-8                 50000             60539 ns/op
BenchmarkCompileAndExecuteComplexWithoutSandbox         10000            162086 ns/op
BenchmarkCompileAndExecuteComplexWithoutSandbox-2       10000            159771 ns/op
BenchmarkCompileAndExecuteComplexWithoutSandbox-4       10000            163826 ns/op
BenchmarkCompileAndExecuteComplexWithoutSandbox-8       10000            169062 ns/op
BenchmarkParallelExecuteComplexWithoutSandbox           50000             57152 ns/op
BenchmarkParallelExecuteComplexWithoutSandbox-2         50000             30276 ns/op
BenchmarkParallelExecuteComplexWithoutSandbox-4        100000             22065 ns/op
BenchmarkParallelExecuteComplexWithoutSandbox-8        100000             18034 ns/op

Benchmarked on October 2nd 2014.