Add selections

src/buffer.go

@@ -12,11 +12,17 @@ type Buffer struct {
 	Name      string
 	Contents  string
 	CursorPos int
+	Selection *Selection
 
 	canSave  bool
 	filename string
 }
 
+type Selection struct {
+	selectionStart int
+	selectionEnd   int
+}
+
 var Buffers = make(map[int]*Buffer)
 var LastBufferId int
 
@@ -54,6 +60,25 @@ func (buffer *Buffer) Save() error {
 	return nil
 }
 
+func (buffer *Buffer) GetSelectedText() string {
+	if buffer.Selection == nil {
+		return ""
+	}
+
+	if len(buffer.Contents) == 0 {
+		return ""
+	}
+
+	start := buffer.Selection.selectionStart
+	end := buffer.Selection.selectionEnd
+
+	if start <= end {
+		return buffer.Contents[buffer.Selection.selectionStart : buffer.Selection.selectionEnd+1]
+	} else {
+		return buffer.Contents[buffer.Selection.selectionEnd : buffer.Selection.selectionStart+1]
+	}
+}
+
 func GetOpenFileBuffer(filename string) *Buffer {
 	// Replace tilde with home directory
 	if filename != "~" && strings.HasPrefix(filename, "~/") {