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templates.go
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templates.go
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package got
import (
"bytes"
"fmt"
"html/template"
"net/http"
"path/filepath"
"regexp"
)
// Children define the base template using comments: { /* use basetemplate */ }
var parentRegex = regexp.MustCompile(`\{\s*\/\*\s*use\s(\w+)\s*\*\/\s*\}`)
// Error for loading missing templates
// var ErrNotFound = errors.New("Template not found")
// NotFoundError for type assertions in the caller while still providing context
type NotFoundError struct {
Name string
}
func (t *NotFoundError) Error() string {
return fmt.Sprintf("template %q not found", t.Name)
}
// Might provide a default error template, probably not
// const errorTemplateHTML = `
// <!DOCTYPE html>
// <html>
// <head>
// <meta charset="UTF-8">
// <title>{{.Error}}</title>
// <style type="text/css">
// body { margin: 0 auto; max-width: 600px; }
// pre { background: #eee; padding: 1em; margin: 1em 0; }
// </pre>
// </head>
// <body>
// <h2>Error: {{.Error}}</h2>
// <pre>{{.Trace}}</pre>
// </body>
// </html>`
//
// // Template for displaying errors
// var ErrorTemplate = template.Must(template.New("error").Parse(errorTemplateHTML))
// Templates Collection
type Templates struct {
Extension string
Dir string
Templates map[string]*template.Template
}
// New templates collection
func New(templatesDir, extension string, functions template.FuncMap) (*Templates, error) {
t := &Templates{
Extension: extension,
Dir: templatesDir,
Templates: make(map[string]*template.Template),
}
return t, t.load(functions)
}
// Funcs function map for templates
func (t *Templates) Funcs(functions template.FuncMap) *Templates {
for _, tmpl := range t.Templates {
tmpl.Funcs(functions)
}
return t
}
// Handles loading required templates
func (t *Templates) load(functions template.FuncMap) (err error) {
// Child pages to render
var pages map[string][]byte
pages, err = loadTemplateFiles(t.Dir, "pages/", t.Extension)
if err != nil {
return
}
// Shared templates across multiple pages (sidebars, scripts, footers, etc...)
var includes map[string][]byte
includes, err = loadTemplateFiles(t.Dir, "includes", t.Extension)
if err != nil {
return
}
// Layouts used by pages
var layouts map[string][]byte
layouts, err = loadTemplateFiles(t.Dir, "layouts", t.Extension)
if err != nil {
return
}
var tmpl *template.Template
for name, b := range pages {
matches := parentRegex.FindSubmatch(b)
basename := filepath.Base(name)
tmpl, err = template.New(basename).Funcs(functions).Parse(string(b))
if err != nil {
return
}
// Uses a layout
if len(matches) == 2 {
l, ok := layouts[filepath.Join("layouts", string(matches[1]))]
if !ok {
err = fmt.Errorf("unknown file: layouts/%s%s", matches[1], t.Extension)
return
}
tmpl.New("layout").Parse(string(l))
}
if len(includes) > 0 {
for name, src := range includes {
_, err = tmpl.New(name).Parse(string(src))
if err != nil {
return
}
}
}
t.Templates[basename] = tmpl
}
return
}
// DefinedTemplates loaded by got (for debugging)
func (t *Templates) DefinedTemplates() (out string) {
for _, tmpl := range t.Templates {
out += fmt.Sprintf("%s%s\n", tmpl.Name(), tmpl.DefinedTemplates())
}
return
}
// Render the template & data to the ResponseWriter safely
func (t *Templates) Render(w http.ResponseWriter, template string, data interface{}, status int) error {
buf, err := t.Compile(template, data)
if err != nil {
return err
}
w.WriteHeader(status)
// Set the header and write the buffer to the http.ResponseWriter
w.Header().Set("Content-Type", "text/html; charset=utf-8")
buf.WriteTo(w)
return nil
}
// Compile the template and return the buffer containing the rendered bytes
func (t *Templates) Compile(template string, data interface{}) (*bytes.Buffer, error) {
// Look for the template
tmpl, ok := t.Templates[template]
if !ok {
err := &NotFoundError{template}
return nil, err
}
// Create a buffer so syntax errors don't return a half-rendered response body
var b []byte
buf := bytes.NewBuffer(b)
if err := tmpl.ExecuteTemplate(buf, "layout", data); err != nil {
return buf, err
}
return buf, nil
}
// Not enough benefit for the added complexity
//
// CompileWithBuffer for the template bytes
// func (t *Templates) CompileWithBuffer(template string, data interface{}, buf *bytes.Buffer) error {
//
// // Look for the template
// tmpl, ok := t.Templates[template]
//
// if !ok {
// return &NotFoundError{template}
// }
//
// if err := tmpl.ExecuteTemplate(buf, "layout", data); err != nil {
// return err
// }
//
// return nil
// }
// Make sure any template errors are caught before sending content to client
// A BufferPool will reduce allocs
// var bufpool *bpool.BufferPool
//
// func init() {
// bufpool = bpool.NewBufferPool(32)
// }