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mustache.go
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mustache.go
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package mustache
import (
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"strings"
"sync"
"github.com/cbroglie/mustache"
"github.com/gofiber/template/utils"
"github.com/valyala/bytebufferpool"
)
// Engine struct
type Engine struct {
// views folder
directory string
// http.FileSystem supports embedded files
fileSystem http.FileSystem
// partialsProvider supports partials for embedded files
partialsProvider *fileSystemPartialProvider
// views extension
extension string
// layout variable name that incapsulates the template
layout string
// determines if the engine parsed all templates
loaded bool
// reload on each render
reload bool
// debug prints the parsed templates
debug bool
// lock for funcmap and templates
mutex sync.RWMutex
// templates
Templates map[string]*mustache.Template
}
type fileSystemPartialProvider struct {
fileSystem http.FileSystem
extension string
}
func (p fileSystemPartialProvider) Get(path string)(string,error) {
buf, err := utils.ReadFile(path + p.extension, p.fileSystem)
if err != nil {
fmt.Println(err)
}
return string(buf), nil
}
// New returns a Handlebar render engine for Fiber
func New(directory, extension string) *Engine {
engine := &Engine{
directory: directory,
extension: extension,
layout: "embed",
}
return engine
}
// NewFileSystem returns a Handlebar render engine for Fiber supporting embedded files
func NewFileSystem(fs http.FileSystem, extension string) *Engine {
engine := &Engine{
directory: "/",
fileSystem: fs,
extension: extension,
layout: "embed",
}
return engine
}
// NewFileSystemPartials returns a Handlebar render engine for Fiber supporting embedded files
func NewFileSystemPartials(fs http.FileSystem, extension string, partialsFS http.FileSystem) *Engine {
engine := NewFileSystem(fs, extension)
engine.partialsProvider = &fileSystemPartialProvider{
fileSystem: partialsFS,
extension: extension,
}
return engine
}
// Layout defines the variable name that will incapsulate the template
func (e *Engine) Layout(key string) *Engine {
e.layout = key
return e
}
// Delims sets the action delimiters to the specified strings, to be used in
// templates. An empty delimiter stands for the
// corresponding default: {{ or }}.
func (e *Engine) Delims(left, right string) *Engine {
fmt.Println("delims: this method is not supported for mustache")
return e
}
// Reload if set to true the templates are reloading on each render,
// use it when you're in development and you don't want to restart
// the application when you edit a template file.
func (e *Engine) Reload(enabled bool) *Engine {
e.reload = enabled
return e
}
// Debug will print the parsed templates when Load is triggered.
func (e *Engine) Debug(enabled bool) *Engine {
e.debug = enabled
return e
}
// Parse is deprecated, please use Load() instead
func (e *Engine) Parse() error {
fmt.Println("Parse() is deprecated, please use Load() instead.")
return e.Load()
}
// Load parses the templates to the engine.
func (e *Engine) Load() error {
// race safe
e.mutex.Lock()
defer e.mutex.Unlock()
e.Templates = make(map[string]*mustache.Template)
// Loop trough each directory and register template files
walkFn := func(path string, info os.FileInfo, err error) error {
// Return error if exist
if err != nil {
return err
}
// Skip file if it's a directory or has no file info
if info == nil || info.IsDir() {
return nil
}
// Get file extension of file
ext := filepath.Ext(path)
// Skip file if it does not equal the given template extension
if ext != e.extension {
return nil
}
// Get the relative file path
// ./views/html/index.tmpl -> index.tmpl
rel, err := filepath.Rel(e.directory, path)
if err != nil {
return err
}
// Reverse slashes '\' -> '/' and
// partials\footer.tmpl -> partials/footer.tmpl
name := filepath.ToSlash(rel)
// Remove ext from name 'index.tmpl' -> 'index'
name = strings.TrimSuffix(name, e.extension)
// name = strings.Replace(name, e.extension, "", -1)
// Read the file
// #gosec G304
buf, err := utils.ReadFile(path, e.fileSystem)
if err != nil {
return err
}
// Create new template associated with the current one
// This enable use to invoke other templates {{ template .. }}
var tmpl *mustache.Template
if e.partialsProvider != nil {
tmpl, err = mustache.ParseStringPartials(string(buf),e.partialsProvider)
} else{
tmpl, err = mustache.ParseString(string(buf))
}
if err != nil {
return err
}
e.Templates[name] = tmpl
// Debugging
if e.debug {
fmt.Printf("views: parsed template: %s\n", name)
}
return err
}
// notify engine that we parsed all templates
e.loaded = true
if e.fileSystem != nil {
return utils.Walk(e.fileSystem, e.directory, walkFn)
}
return filepath.Walk(e.directory, walkFn)
}
// Execute will render the template by name
func (e *Engine) Render(out io.Writer, template string, binding interface{}, layout ...string) error {
if !e.loaded || e.reload {
if e.reload {
e.loaded = false
}
if err := e.Load(); err != nil {
return err
}
}
tmpl := e.Templates[template]
if tmpl == nil {
return fmt.Errorf("render: template %s does not exist", template)
}
if len(layout) > 0 {
buf := bytebufferpool.Get()
defer bytebufferpool.Put(buf)
if err := tmpl.FRender(buf, binding); err != nil {
return err
}
var bind map[string]interface{}
if binding == nil {
bind = make(map[string]interface{}, 1)
} else if context, ok := binding.(map[string]interface{}); ok {
bind = context
} else {
bind = make(map[string]interface{}, 1)
}
bind[e.layout] = buf.String()
lay := e.Templates[layout[0]]
if lay == nil {
return fmt.Errorf("render: layout %s does not exist", layout[0])
}
return lay.FRender(out, bind)
}
return tmpl.FRender(out, binding)
}