Implement "embedded" command to extract static resources (#9982)

* draft

* Implement extract command

* Fix nits and force args on extract

* Add !bindata stub, support Windows, fmt

* fix vendored flag

* Remove leading slash for matching

* Add docs

* Fix typos

* Add embedded view command

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/options/static.go

@@ -113,6 +113,37 @@ func fileFromDir(name string) ([]byte, error) {
 	return ioutil.ReadAll(f)
 }
 
+func Asset(name string) ([]byte, error) {
+	f, err := Assets.Open("/" + name)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return ioutil.ReadAll(f)
+}
+
+func AssetNames() []string {
+	realFS := Assets.(vfsgen۰FS)
+	var results = make([]string, 0, len(realFS))
+	for k := range realFS {
+		results = append(results, k[1:])
+	}
+	return results
+}
+
+func AssetIsDir(name string) (bool, error) {
+	if f, err := Assets.Open("/" + name); err != nil {
+		return false, err
+	} else {
+		defer f.Close()
+		if fi, err := f.Stat(); err != nil {
+			return false, err
+		} else {
+			return fi.IsDir(), nil
+		}
+	}
+}
+
 // IsDynamic will return false when using embedded data (-tags bindata)
 func IsDynamic() bool {
 	return false

modules/public/static.go

@@ -7,6 +7,8 @@
 package public
 
 import (
+	"io/ioutil"
+
 	"gitea.com/macaron/macaron"
 )
 
@@ -17,3 +19,34 @@ func Static(opts *Options) macaron.Handler {
 	// used when in the options there is no FileSystem.
 	return opts.staticHandler("")
 }
+
+func Asset(name string) ([]byte, error) {
+	f, err := Assets.Open("/" + name)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	return ioutil.ReadAll(f)
+}
+
+func AssetNames() []string {
+	realFS := Assets.(vfsgen۰FS)
+	var results = make([]string, 0, len(realFS))
+	for k := range realFS {
+		results = append(results, k[1:])
+	}
+	return results
+}
+
+func AssetIsDir(name string) (bool, error) {
+	if f, err := Assets.Open("/" + name); err != nil {
+		return false, err
+	} else {
+		defer f.Close()
+		if fi, err := f.Stat(); err != nil {
+			return false, err
+		} else {
+			return fi.IsDir(), nil
+		}
+	}
+}

modules/templates/static.go

@@ -229,3 +229,16 @@ func AssetNames() []string {
 	}
 	return results
 }
+
+func AssetIsDir(name string) (bool, error) {
+	if f, err := Assets.Open("/" + name); err != nil {
+		return false, err
+	} else {
+		defer f.Close()
+		if fi, err := f.Stat(); err != nil {
+			return false, err
+		} else {
+			return fi.IsDir(), nil
+		}
+	}
+}