camper/pkg/template/render.go

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Add the skeleton of the web application It does nothing more than to server a single page that does nothing interesting. This time i do not use a router. Instead, i am trying out a technique i have seen in an article[0] that i have tried in other, smaller, projects and seems to work surprisingly well: it just “cuts off” the URI path by path, passing the request from handler to handler until it finds its way to a handler that actually serves the request. That helps to loosen the coupling between the application and lower handlers, and makes dependencies explicit, because i need to pass the locale, company, etc. down instead of storing them in contexts. Let’s see if i do not regret it on a later date. I also made a lot more packages that in Numerus. In Numerus i actually only have the single pkg package, and it works, kind of, but i notice how i name my methods to avoid clashing instead of using packages for that. That is, instead of pkg.NewApp i now have app.New. Initially i thought that Locale should be inside app, but then there was a circular dependency between app and template. That is why i created a separate package, but now i am wondering if template should be inside app too, but then i would have app.MustRenderTemplate instead of template.MustRender. The CSS is the most bare-bones file i could write because i am focusing in markup right now; Oriol will fill in the file once the application is working. [0]: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
2023-07-22 22:11:00 +00:00
/*
* SPDX-FileCopyrightText: 2023 jordi fita mas <jfita@peritasoft.com>
* SPDX-License-Identifier: AGPL-3.0-only
*/
package template
import (
"html/template"
"io"
"net/http"
"dev.tandem.ws/tandem/camper/pkg/locale"
)
func templateFile(name string) string {
return "web/templates/" + name
}
func MustRender(w io.Writer, locale *locale.Locale, filename string, data interface{}) {
layout := "layout.gohtml"
mustRenderLayout(w, locale, layout, filename, data)
}
func mustRenderLayout(w io.Writer, locale *locale.Locale, layout string, filename string, data interface{}) {
t := template.New(filename)
t.Funcs(template.FuncMap{
"gettext": locale.Get,
"pgettext": locale.GetC,
"currentLocale": func() string {
return locale.Language.String()
},
})
if _, err := t.ParseFiles(templateFile(layout), templateFile(filename)); err != nil {
panic(err)
}
if rw, ok := w.(http.ResponseWriter); ok {
rw.Header().Set("Content-Type", "text/html; charset=utf-8")
}
if err := t.ExecuteTemplate(w, layout, data); err != nil {
panic(err)
}
}