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package render
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import (
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"bytes"
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"html/template"
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"log"
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"net/http"
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"path/filepath"
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)
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// RenderTemplate renders a HTML template file
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func RenderTemplate(w http.ResponseWriter, tmpl string) {
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// create a template cache
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tc, err := createTemplateCache()
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if err != nil {
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log.Fatal(err)
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}
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// get requested template from cache
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t, ok := tc[tmpl]
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if !ok {
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log.Fatal(err)
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}
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// Write to a buffer to make sure that the template can be read and
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// written successfully
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buf := new(bytes.Buffer)
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err = t.Execute(buf, nil)
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if err != nil {
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log.Println(err)
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}
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// render the template
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_, err = buf.WriteTo(w)
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if err != nil {
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log.Println(err)
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}
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}
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func createTemplateCache() (map[string]*template.Template, error) {
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myCache := map[string]*template.Template{}
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// get all of the files named *.page.tmpl from ./templates
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pages, err := filepath.Glob("./templates/*.page.tmpl")
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if err != nil {
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return myCache, err
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}
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// range through all files ending with *page.tmpl
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for _, page := range pages {
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name := filepath.Base(page)
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ts, err := template.New(name).ParseFiles(page)
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if err != nil {
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return myCache, err
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}
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matches, err := filepath.Glob("./templates/*.layout.tmpl")
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if err != nil {
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return myCache, err
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}
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if len(matches) > 0 {
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ts, err = ts.ParseGlob("./templates/*.layout.tmpl")
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if err != nil {
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return myCache, err
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}
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}
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myCache[name] = ts
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}
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return myCache, nil
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}
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