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renderer.go
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/
renderer.go
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// mapgen - fantasy map generator
// Copyright (c) 2023 Michael D Henderson
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package server
import (
"bytes"
"html/template"
"net/http"
)
type Renderer struct {
files []string
t *template.Template
}
func (rr *Renderer) render(w http.ResponseWriter, r *http.Request, payload any) {
t := rr.t
if t == nil {
var err error
t, err = template.ParseFiles(rr.files...)
if err != nil {
//log.Printf("%s %s: %v\n", r.Method, r.URL, err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
}
type Data struct {
Payload any
}
data := Data{Payload: payload}
bb := &bytes.Buffer{}
if err := t.ExecuteTemplate(bb, "layout", data); err != nil {
//log.Printf("%s %s: %v\n", r.Method, r.URL, err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
_, _ = w.Write(bb.Bytes())
}