i18n: expose the LoaderConfig from the main i18n instance and add an example

Signed-off-by: Gerasimos (Makis) Maropoulos <kataras2006@hotmail.com>

_examples/i18n/i18n-template/locales/el-GR/welcome.yml

@@ -0,0 +1,2 @@
+Dog: "σκυλί"
+HiDogs: Γειά {{plural (tr .locale "Dog") .count }}

_examples/i18n/i18n-template/locales/en-US/welcome.yml

@@ -0,0 +1,2 @@
+Dog: "dog"
+HiDogs: Hi {{plural (tr .locale "Dog") .count }}

_examples/i18n/i18n-template/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"github.com/kataras/iris/v12"
+
+	// go get -u github.com/gertd/go-pluralize
+	"github.com/gertd/go-pluralize"
+)
+
+func main() {
+	app := newApp()
+	app.Listen(":8080")
+}
+
+func newApp() *iris.Application {
+	app := iris.New()
+
+	pluralize := pluralize.NewClient()
+	app.I18n.Loader.FuncMap = map[string]interface{}{
+		"plural": func(word string, count int) string {
+			// Your own implementation or use a 3rd-party package
+			// like we do here.
+			//
+			// Note that this is only for english,
+			// but you can accept the language code
+			// and use a map with dictionaries to
+			// pluralize words based on the given language.
+			return pluralize.Pluralize(word, count, true)
+		},
+	}
+	app.I18n.Load("./locales/*/*.yml", "en-US", "el-GR")
+
+	app.Get("/", func(ctx iris.Context) {
+		text := ctx.Tr("HiDogs", iris.Map{
+			"locale": ctx.GetLocale(),
+			"count":  2,
+		}) // prints "Hi 2 dogs".
+		ctx.WriteString(text)
+	})
+
+	return app
+}

_examples/i18n/i18n-template/main_test.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/kataras/iris/v12/httptest"
+)
+
+func TestI18nLoaderFuncMap(t *testing.T) {
+	app := newApp()
+
+	e := httptest.New(t, app)
+	e.GET("/").Expect().Status(httptest.StatusOK).
+		Body().Equal("Hi 2 dogs")
+	e.GET("/").WithHeader("Accept-Language", "el").Expect().Status(httptest.StatusOK).
+		Body().Equal("Γειά 2 σκυλί")
+}

_examples/logging/request-logger/accesslog-broker/main.go

@@ -16,7 +16,8 @@ func main() {
 
 	ac := accesslog.File("./access.log")
 	ac.TimeFormat = "2006-01-02 15:04:05"
-	ac.Async = true
+	// Optionally run logging after response has sent:
+	// ac.Async = true
 	broker := ac.Broker() // <- IMPORTANT
 
 	app := iris.New()
@@ -25,7 +26,11 @@ func main() {
 	app.Get("/", indexHandler)
 	app.Get("/profile/{username}", profileHandler)
 	app.Post("/read_body", readBodyHandler)
-	app.Get("/logs", logsHandler(broker))
+
+	// register the /logs route,
+	// registers a listener and prints the incoming logs.
+	// Optionally, skip logging this handler.
+	app.Get("/logs", accesslog.SkipHandler, logsHandler(broker))
 
 	// http://localhost:8080/logs to see the logs at real-time.
 	app.Listen(":8080")
@@ -52,8 +57,7 @@ func readBodyHandler(ctx iris.Context) {
 
 func logsHandler(b *accesslog.Broker) iris.Handler {
 	return func(ctx iris.Context) {
-		accesslog.Skip(ctx) // skip logging this handler, optionally.
+		// accesslog.Skip(ctx) // or inline skip.
-
 		logs := b.NewListener() // <- IMPORTANT
 
 		ctx.Header("Transfer-Encoding", "chunked")

i18n/i18n.go

@@ -49,6 +49,7 @@ type I18n struct {
 	localizer Localizer
 	matcher   *Matcher
 
+	Loader *LoaderConfig
 	loader Loader
 	mu     sync.Mutex
 
@@ -106,11 +107,18 @@ func makeTags(languages ...string) (tags []language.Tag) {
 
 // New returns a new `I18n` instance. Use its `Load` or `LoadAssets` to load languages.
 func New() *I18n {
-	return &I18n{
+	i := &I18n{
+		Loader: &LoaderConfig{
+			Left:   "{{",
+			Right:  "}}",
+			Strict: false,
+		},
 		URLParameter: "lang",
 		Subdomain:    true,
 		PathRedirect: true,
 	}
+
+	return i
 }
 
 // Load is a method shortcut to load files using a filepath.Glob pattern.
@@ -118,7 +126,7 @@ func New() *I18n {
 //
 // See `New` and `Glob` package-level functions for more.
 func (i *I18n) Load(globPattern string, languages ...string) error {
-	return i.Reset(Glob(globPattern), languages...)
+	return i.Reset(Glob(globPattern, i.Loader), languages...)
 }
 
 // LoadAssets is a method shortcut to load files using go-bindata.
@@ -126,7 +134,7 @@ func (i *I18n) Load(globPattern string, languages ...string) error {
 //
 // See `New` and `Asset` package-level functions for more.
 func (i *I18n) LoadAssets(assetNames func() []string, asset func(string) ([]byte, error), languages ...string) error {
-	return i.Reset(Assets(assetNames, asset), languages...)
+	return i.Reset(Assets(assetNames, asset, i.Loader), languages...)
 }
 
 // Reset sets the locales loader and languages.

i18n/loader.go

@@ -21,7 +21,8 @@ import (
 // some options about how the template loader should act.
 //
 // See `Glob` and `Assets` package-level functions.
-type LoaderConfig struct {
+type (
+	LoaderConfig struct {
 		// Template delimeters, defaults to {{ }}.
 		Left, Right string
 		// Template functions map, defaults to nil.
@@ -31,10 +32,28 @@ type LoaderConfig struct {
 		// Defaults to false.
 		Strict bool
 	}
-
 	// LoaderOption is a type which accepts a pointer to `LoaderConfig`
-// and can be optionally passed to the second variadic input argument of the `Glob` and `Assets` functions.
+	// and can be optionally passed to the second
-type LoaderOption func(*LoaderConfig)
+	// variadic input argument of the `Glob` and `Assets` functions.
+	LoaderOption interface {
+		Apply(*LoaderConfig)
+	}
+)
+
+// Apply implements the `LoaderOption` interface.
+func (c *LoaderConfig) Apply(cfg *LoaderConfig) {
+	for k, v := range c.FuncMap {
+		if cfg.FuncMap == nil {
+			cfg.FuncMap = make(template.FuncMap)
+		}
+
+		cfg.FuncMap[k] = v
+	}
+
+	cfg.Left = c.Left
+	cfg.Right = c.Right
+	cfg.Strict = c.Strict
+}
 
 // Glob accepts a glob pattern (see: https://golang.org/pkg/path/filepath/#Glob)
 // and loads the locale files based on any "options".
@@ -73,10 +92,18 @@ func load(assetNames []string, asset func(string) ([]byte, error), options ...Lo
 		Left:   "{{",
 		Right:  "}}",
 		Strict: false,
+		FuncMap: template.FuncMap{
+			// get returns the value of a translate key, can be used inside other template keys
+			// to translate different words based on the current locale.
+			"tr": func(locale context.Locale, key string, args ...interface{}) string {
+				return locale.GetMessage(key, args...)
+			},
+			// ^ Alternative to {{call .tr "Dog" | plural }}
+		},
 	}
 
 	for _, opt := range options {
-		opt(&c)
+		opt.Apply(&c)
 	}
 
 	return func(m *Matcher) (Localizer, error) {
@@ -250,9 +277,11 @@ func (l *defaultLocale) getMessage(langInput, key string, args ...interface{}) s
 		// search on templates.
 		if tmpl, ok := l.templateKeys[key]; ok {
 			buf := new(bytes.Buffer)
-			if err := tmpl.Execute(buf, args[0]); err == nil {
+			err := tmpl.Execute(buf, args[0])
-				return buf.String()
+			if err != nil {
+				return err.Error()
 			}
+			return buf.String()
 		}
 	}
 

middleware/accesslog/accesslog.go

@@ -43,6 +43,13 @@ func Skip(ctx iris.Context) {
 	ctx.Values().Set(skipLogContextKey, struct{}{})
 }
 
+// SkipHandler same as `Skip` but it can be used
+// as a middleware, it executes ctx.Next().
+func SkipHandler(ctx iris.Context) {
+	Skip(ctx)
+	ctx.Next()
+}
+
 func shouldSkip(ctx iris.Context) bool {
 	return ctx.Values().Get(skipLogContextKey) != nil
 }