fix

gui/gui.go

@@ -265,7 +265,8 @@ func (gui *GUI) Render() error {
 			gui.updateTexts()
 
 			// Render the string.
-			gui.window.SetTitle(gui.terminal.GetTitle())
+			// @todo uncommentbut dont run all of the time... - perhaps use onTitleChange event from terminal?
+			//gui.window.SetTitle(gui.terminal.GetTitle())
 
 			//gl.ClearColor(0.5, 0.5, 0.5, 1.0)
 			gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
@@ -284,7 +285,7 @@ func (gui *GUI) Render() error {
 			}
 
 			gui.font.SetColor(1, 0.2, 0.2, 0.5)
-			gui.font.Printf(50, 50, 2, "Position=%#v", gui.terminal.GetPosition())
+			gui.font.Printf(100, 300, 1.5, "%#v %s", gui.terminal.GetPosition(), gui.terminal.GetLineString())
 
 		}
 

terminal/ansi.go

@@ -1,7 +1,8 @@
 package terminal
 
 var ansiSequenceMap = map[rune]escapeSequenceHandler{
-	'[': csiHandler,
+	'[':  csiHandler,
+	0x5d: oscHandler,
 }
 
 func ansiHandler(buffer chan rune, terminal *Terminal) error {
@@ -14,27 +15,7 @@ func ansiHandler(buffer chan rune, terminal *Terminal) error {
 	}
 
 	switch b {
-	case 0x5d: // OSC: Operating System Command
+
-		b = <-buffer
-		switch b {
-		case rune('0'):
-			b = <-buffer
-			if b == rune(';') {
-				title := []rune{}
-				for {
-					b = <-buffer
-					if b == 0x07 || b == 0x5c { // 0x07 -> BELL, 0x5c -> ST (\)
-						break
-					}
-					title = append(title, b)
-				}
-				terminal.title = string(title)
-			} else {
-				terminal.logger.Errorf("Invalid OSC 0 control sequence: 0x%02X", b)
-			}
-		default:
-			terminal.logger.Errorf("Unknown OSC control sequence: 0x%02X", b)
-		}
 	case 'c':
 		terminal.logger.Errorf("RIS not yet supported")
 	case '(':

terminal/csi.go

@@ -261,8 +261,7 @@ CSI:
 			}
 		}
 
-		// @todo delete n cells at position
+		_ = terminal.delete(n)
-		_ = n
 
 	default:
 		switch param + intermediate + string(final) {

terminal/delete.go

@@ -0,0 +1,39 @@
+package terminal
+
+import (
+	"fmt"
+)
+
+func (terminal *Terminal) delete(n int) error {
+	if len(terminal.lines) <= terminal.position.Line {
+		return fmt.Errorf("Cannot delete character at current position - line does not exist")
+	}
+	line := &terminal.lines[terminal.position.Line]
+
+	if terminal.position.Col >= len(line.Cells) {
+		return fmt.Errorf("Line not long enough to delete anything")
+	}
+
+	for terminal.position.Col+n > len(line.Cells) {
+		n--
+	}
+	after := line.Cells[terminal.position.Col+n:]
+	before := line.Cells[:terminal.position.Col]
+
+	line.Cells = append(before, after...)
+
+	// @todo rewrap lines here
+	// so if line overflows and then we delete characters from beginnign of the line
+
+	return nil
+}
+
+// @todo remove this debug func
+func (terminal *Terminal) GetLineString() string {
+	if len(terminal.lines) <= terminal.position.Line {
+		return ""
+	}
+	line := &terminal.lines[terminal.position.Line]
+
+	return line.String()
+}

terminal/delete_test.go

@@ -0,0 +1,91 @@
+package terminal
+
+import "testing"
+
+func TestDelete(t *testing.T) {
+	terminal := &Terminal{
+		lines: []Line{
+			{
+				Cells: []Cell{
+					{
+						r: 'a',
+					},
+					{
+						r: 'b',
+					},
+					{
+						r: 'c',
+					},
+					{
+						r: 'd',
+					},
+					{
+						r: 'e',
+					},
+				},
+			},
+			{
+				Cells: []Cell{
+					{
+						r: 'f',
+					},
+					{
+						r: 'g',
+					},
+					{
+						r: 'h',
+					},
+					{
+						r: 'i',
+					},
+					{
+						r: 'j',
+					},
+				},
+			},
+			{
+				Cells: []Cell{
+					{
+						r: 'k',
+					},
+					{
+						r: 'l',
+					},
+					{
+						r: 'm',
+					},
+					{
+						r: 'n',
+					},
+					{
+						r: 'o',
+					},
+				},
+			},
+		},
+	}
+
+	terminal.position = Position{
+		Col:  3,
+		Line: 1,
+	}
+
+	if err := terminal.delete(2); err != nil {
+		t.Errorf("Delete failed: %s", err)
+	}
+
+	if len(terminal.lines) != 3 {
+		t.Errorf("No. of lines has changed by deleting characters")
+	}
+
+	if "fgh" != terminal.lines[1].String() {
+		t.Errorf("Unexpected string after deletion: %s", terminal.lines[1].String())
+	}
+	if "abcde" != terminal.lines[0].String() {
+		t.Errorf("Unexpected string after deletion: %s", terminal.lines[0].String())
+	}
+
+	if "klmno" != terminal.lines[2].String() {
+		t.Errorf("Unexpected string after deletion: %s", terminal.lines[2].String())
+	}
+}

terminal/osc.go

@@ -0,0 +1,27 @@
+package terminal
+
+import "fmt"
+
+func oscHandler(buffer chan rune, terminal *Terminal) error {
+	b := <-buffer
+	switch b {
+	case rune('0'):
+		b = <-buffer
+		if b == rune(';') {
+			title := []rune{}
+			for {
+				b = <-buffer
+				if b == 0x07 || b == 0x5c { // 0x07 -> BELL, 0x5c -> ST (\)
+					break
+				}
+				title = append(title, b)
+			}
+			terminal.title = string(title)
+		} else {
+			return fmt.Errorf("Invalid OSC 0 control sequence: 0x%02X", b)
+		}
+	default:
+		return fmt.Errorf("Unknown OSC control sequence: 0x%02X", b)
+	}
+	return nil
+}