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jet.go
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jet.go
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package jet
import (
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"sync"
"github.com/CloudyKit/jet/v6"
"github.com/CloudyKit/jet/v6/loaders/httpfs"
"github.com/gofiber/fiber/v2"
"github.com/gofiber/template/utils"
)
// Engine struct
type Engine struct {
// delimiters
left string
right string
// views folder
directory string
// http.FileSystem supports embedded files
fileSystem http.FileSystem
// 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
// template funcmap
funcmap map[string]interface{}
// templates
Templates *jet.Set
}
// New returns a Jet render engine for Fiber
func New(directory, extension string) *Engine {
// jet library does not export or give us any option to modify the file extension
if extension != ".html.jet" && extension != ".jet.html" && extension != ".jet" {
log.Fatalf("%s extension is not a valid jet engine ['.html.jet', .jet.html', '.jet']", extension)
}
engine := &Engine{
directory: directory,
extension: extension,
layout: "embed",
funcmap: make(map[string]interface{}),
}
return engine
}
func NewFileSystem(fs http.FileSystem, extension string) *Engine {
// jet library does not export or give us any option to modify the file extension
if extension != ".html.jet" && extension != ".jet.html" && extension != ".jet" {
log.Fatalf("%s extension is not a valid jet engine ['.html.jet', .jet.html', '.jet']", extension)
}
engine := &Engine{
directory: "/",
fileSystem: fs,
extension: extension,
layout: "embed",
funcmap: make(map[string]interface{}),
}
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 {
e.left, e.right = left, right
return e
}
// AddFunc adds the function to the template's function map.
// It is legal to overwrite elements of the default actions
func (e *Engine) AddFunc(name string, fn interface{}) *Engine {
e.mutex.Lock()
e.funcmap[name] = fn
e.mutex.Unlock()
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()
}
// Parse parses the templates to the engine.
func (e *Engine) Load() (err error) {
// race safe
e.mutex.Lock()
defer e.mutex.Unlock()
// parse templates
// e.Templates = jet.NewHTMLSet(e.directory)
var loader jet.Loader
if e.fileSystem != nil {
loader, err = httpfs.NewLoader(e.fileSystem)
if err != nil {
return
}
} else {
loader = jet.NewInMemLoader()
}
if e.debug {
e.Templates = jet.NewSet(
loader,
jet.WithDelims(e.left, e.right),
jet.InDevelopmentMode(),
)
} else {
e.Templates = jet.NewSet(
loader,
jet.WithDelims(e.left, e.right),
)
}
for name, fn := range e.funcmap {
e.Templates.AddGlobal(name, fn)
}
walkFn := func(path string, info os.FileInfo, err error) error {
l := loader.(*jet.InMemLoader)
// 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
}
// Skip file if it does not equal the given template extension
if len(e.extension) >= len(path) || path[len(path)-len(e.extension):] != e.extension {
return nil
}
// ./views/html/index.tmpl -> index.tmpl
rel, err := filepath.Rel(e.directory, path)
if err != nil {
return err
}
name := strings.TrimSuffix(rel, e.extension)
// Read the file
// #gosec G304
buf, err := utils.ReadFile(path, e.fileSystem)
if err != nil {
return err
}
l.Set(name, string(buf))
// Debugging
if e.debug {
fmt.Printf("views: parsed template: %s\n", name)
}
return err
}
e.loaded = true
if _, ok := loader.(*jet.InMemLoader); ok {
return filepath.Walk(e.directory, walkFn)
}
return
}
// 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, err := e.Templates.GetTemplate(template)
if err != nil || tmpl == nil {
return fmt.Errorf("render: template %s could not be loaded: %v", template, err)
}
bind := jetVarMap(binding)
if len(layout) > 0 {
lay, err := e.Templates.GetTemplate(layout[0])
if err != nil {
return err
}
bind.Set(e.layout, func() {
_ = tmpl.Execute(out, bind, nil)
})
return lay.Execute(out, bind, nil)
}
return tmpl.Execute(out, bind, nil)
}
func jetVarMap(binding interface{}) jet.VarMap {
var bind jet.VarMap
if binding == nil {
return bind
}
if binds, ok := binding.(map[string]interface{}); ok {
bind = make(jet.VarMap)
for key, value := range binds {
bind.Set(key, value)
}
} else if binds, ok := binding.(fiber.Map); ok {
bind = make(jet.VarMap)
for key, value := range binds {
bind.Set(key, value)
}
} else if binds, ok := binding.(jet.VarMap); ok {
bind = binds
}
return bind
}