Added methods to retrieve the path to the user configuration dir.

io.go

@@ -8,6 +8,7 @@ import (
 	"image/png"
 	"io"
 	"os"
+	"path/filepath"
 )
 
 // CreateJSONDecoder create a new a generic JSON decoder for the specified value.
@@ -89,3 +90,26 @@ var _ EncoderFn = PNGEncoder
 
 // PNGEncoder is a generic PNG encoder.
 func PNGEncoder(w io.Writer, value interface{}) error { return png.Encode(w, value.(image.Image)) }
+
+// UserDir gives back the user configuration directory with given name.
+func UserDir(name string) (string, error) {
+	config, err := os.UserConfigDir()
+	if err != nil {
+		return "", err
+	}
+	dir := filepath.Join(config, name)
+	err = os.MkdirAll(dir, 0777)
+	if err != nil {
+		return "", err
+	}
+	return dir, nil
+}
+
+// UserFile gives back the path to the file with the specified name and the directory named app.
+func UserFile(app, name string) (string, error) {
+	dir, err := UserDir(app)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(dir, name), nil
+}