Copper is a template rendering engine written in Go. It is similar to Buffalo's Plush, but has more capabilities.
Copper is agnostic of any HTTP router or any other framework and can also be used standalone (for example, to render e-mail messages or any other text.)
See Usage Example for a simple standalone example of using Copper.
Copper uses a language similar to Go which should be fairly easy to use.
See SYNTAX.md for a full list of language constructs.
Copper never escapes text automatically. Every time text should be rendered, it must be passed through one of the provided (or a custom) helper function that marks the text to be safe for output, optionally escaping it. While this may sound tedious when coming from other rendering engines, it prevents Copper from guessing (and mis-guessing) the correct escaping mechanism to use. Instead, the responsibility is explicitly shifted to the author of the template.
This is a simple, but full example of how to use Copper. It shows how to render a simple template that outputs some dynamic variables.
See Copper Example for a more complete example that integrates into net/http, Gorilla, Chi, or httprouter.
package main
import (
"bytes"
"context"
"io"
"strings"
"github.com/blizzy78/copper/helpers"
"github.com/blizzy78/copper/template"
)
const (
// the template to render
tmpl = `<html>
<body>
<p>Hello, <% html(who) %>!</p>
<% safe(someHTML) %>
</body>
</html>`
)
func main() {
// load a template by name -
// in this example, we ignore the name and always return the same template
loader := template.LoaderFunc(func(name string) (io.ReadCloser, error) {
return io.NopCloser(strings.NewReader(tmpl)), nil
})
// construct a new renderer
r := template.NewRenderer(loader,
// html will be a global template function that HTML-escapes strings and
// marks them as safe for output
template.WithScopeData("html", helpers.HTML),
// safe will be a global template function that marks strings as safe
// for output
template.WithScopeData("safe", helpers.Safe))
// a context that can be used by template helper functions -
// the renderer does not use it
ctx := context.Background()
// let's render into this buffer - any io.Writer is fine
buf := bytes.Buffer{}
// the name of the template to render -
// in this example, the name is ignored
name := "myTemplate"
// data provided to the template being rendered
data := map[string]interface{}{
"who": "World",
"someHTML": "<p>This is HTML</p>",
}
// parse and render the template
err := r.Render(ctx, &buf, name, data)
if err != nil {
panic(err)
}
// output buffer contents
println(buf.String())
}You can use the coppercli tool to render text on the command line.
Copper is licensed under the MIT license.
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