Add readonly option

internal/buffer/buffer.go

@@ -196,6 +196,10 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 		b.EventHandler = NewEventHandler(b.SharedBuffer, b.cursors)
 	}
 
+	if b.Settings["readonly"].(bool) {
+		b.Type.Readonly = true
+	}
+
 	b.Path = path
 	b.AbsPath = absPath
 

internal/buffer/settings.go

@@ -35,6 +35,8 @@ func (b *Buffer) SetOptionNative(option string, nativeValue interface{}) error {
 		}
 	} else if option == "encoding" {
 		b.isModified = true
+	} else if option == "readonly" {
+		b.Type.Readonly = nativeValue.(bool)
 	}
 
 	return nil

internal/config/settings.go

@@ -194,14 +194,27 @@ func DefaultGlobalSettings() map[string]interface{} {
 	return common
 }
 
+// LocalSettings is a list of the local only settings
+var LocalSettings = []string{"filetype", "readonly"}
+
 // DefaultLocalSettings returns the default local settings
 // Note that filetype is a local only option
 func DefaultLocalSettings() map[string]interface{} {
 	common := DefaultCommonSettings()
 	common["filetype"] = "unknown"
+	common["readonly"] = false
 	return common
 }
 
+func DefaultAllSettings() map[string]interface{} {
+	global := DefaultGlobalSettings()
+	local := DefaultLocalSettings()
+	for k, v := range global {
+		local[k] = v
+	}
+	return local
+}
+
 func GetNativeValue(option string, realValue interface{}, value string) (interface{}, error) {
 	var native interface{}
 	kind := reflect.TypeOf(realValue).Kind()