gonja is pongo2 fork intended to be aligned on Jinja template syntax instead of the Django one.
Install/update using go get (no dependencies required by gonja):
go get github.com/noirbizarre/gonja
Please use the issue tracker if you're encountering any problems with gonja or if you need help with implementing tags or filters (create a ticket!).
<html><head><title>Our admins and users</title></head>
{# This is a short example to give you a quick overview of gonja'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>- Entirely rewritten from the ground-up.
- Advanced C-like expressions.
- Complex function calls within expressions.
- Easy API to create new filters and tags (including parsing arguments)
- Additional features:
- Macros including importing macros from other files (see template_tests/macro.tpl)
- Template sandboxing (directory patterns, banned tags/filters)
- Write filters / statements
- Write/improve code tests (use the following command to see what tests are missing:
go test -v -cover -covermode=count -coverprofile=cover.out && go tool cover -html=cover.outor have a look on gocover.io/github.com/noirbizarre/gonja) - Write/improve template tests (see the
testData/directory) - Write middleware, libraries and websites using gonja. :-)
For a documentation on how the templating language works you can head over to the Jinja documentation. gonja aims to be compatible with it.
You can access gonja's API documentation on godoc.
- format:
formatdoes not take Python's string format syntax as a parameter, instead it takes Go's. Essentially{{ 3.14|stringformat:"pi is %.2f" }}isfmt.Sprintf("pi is %.2f", 3.14). - escape / force_escape: Unlike Jinja's behaviour, the
escape-filter is applied immediately. Therefore there is no need for aforce_escape-filter yet.
Please see the documentation for a full list of provided API methods.
// Compile the template first (i. e. creating the AST)
tpl, err := gonja.FromString("Hello {{ name|capfirst }}!")
if err != nil {
panic(err)
}
// Now you can render the template with the given
// gonja.Context how often you want to.
out, err := tpl.Execute(gonja.Context{"name": "axel"})
if err != nil {
panic(err)
}
fmt.Println(out) // Output: Hello Axel!package main
import (
"github.com/noirbizarre/gonja"
"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 tpl = gonja.Must(gonja.FromFile("example.html"))
func examplePage(w http.ResponseWriter, r *http.Request) {
// Execute the template per HTTP request
out, err := tpl.Execute(gonja.Context{"query": r.FormValue("query")})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
w.WriteString(out)
}
func main() {
http.HandleFunc("/", examplePage)
http.ListenAndServe(":8080", nil)
}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 testData/complex.tpl template.
The results are:
BenchmarkFromCache 30000 41259 ns/op
BenchmarkFromCache-2 30000 42776 ns/op
BenchmarkFromCache-4 30000 44432 ns/op
BenchmarkFromFile 3000 437755 ns/op
BenchmarkFromFile-2 3000 472828 ns/op
BenchmarkFromFile-4 2000 519758 ns/op
BenchmarkExecute 30000 41984 ns/op
BenchmarkExecute-2 30000 48546 ns/op
BenchmarkExecute-4 20000 104469 ns/op
BenchmarkCompileAndExecute 3000 428425 ns/op
BenchmarkCompileAndExecute-2 3000 459058 ns/op
BenchmarkCompileAndExecute-4 3000 488519 ns/op
BenchmarkParallelExecute 30000 45262 ns/op
BenchmarkParallelExecute-2 100000 23490 ns/op
BenchmarkParallelExecute-4 100000 24206 ns/op
Benchmarked on August 18th 2019.
