debug mode

buffer/buffer.go

@@ -413,6 +413,14 @@ func (buffer *Buffer) convertViewLineToRawLine(viewLine uint16) uint64 {
 	return uint64(int(viewLine) + (rawHeight - int(buffer.viewHeight)))
 }
 
+func (buffer *Buffer) convertRawLineToViewLine(rawLine uint64) uint16 {
+	rawHeight := buffer.Height()
+	if int(buffer.viewHeight) > rawHeight {
+		return uint16(rawLine)
+	}
+	return uint16(int(rawLine) - (rawHeight - int(buffer.viewHeight)))
+}
+
 // Width returns the width of the buffer in columns
 func (buffer *Buffer) Width() uint16 {
 	return buffer.viewWidth
@@ -938,19 +946,14 @@ func (buffer *Buffer) ResizeView(width uint16, height uint16) {
 		}
 	}
 
-	fromBottom := buffer.viewHeight - buffer.cursorY
-
 	buffer.viewWidth = width
 	buffer.viewHeight = height
 
-	if buffer.cursorY >= buffer.viewHeight-1 {
+	cY := uint16(len(buffer.lines) - 1)
-		buffer.cursorY = buffer.viewHeight - 1
+	if cY >= buffer.viewHeight {
-	} else {
+		cY = buffer.viewHeight - 1
-		buffer.cursorY = (buffer.viewHeight - fromBottom) + uint16(cursorYMovement)
-		if int(buffer.cursorY) >= buffer.Height() {
-			buffer.cursorY = uint16(buffer.Height() - 1)
-		}
 	}
+	buffer.cursorY = cY
 
 	// position cursorX
 	line = buffer.getCurrentLine()

gui/gui.go

@@ -33,6 +33,7 @@ type GUI struct {
 	mouseDown     bool
 	overlay       overlay
 	terminalAlpha float32
+	showDebugInfo bool
 }
 
 func New(config *config.Config, terminal *terminal.Terminal, logger *zap.SugaredLogger) *GUI {
@@ -250,6 +251,21 @@ func (gui *GUI) Render() error {
 
 			gui.renderOverlay()
 
+			if gui.showDebugInfo {
+				gui.textbox(2, 2, fmt.Sprintf(`Debug Panel
+===========
+Cursor:      %d,%d
+View Size:   %d,%d
+Buffer Size: %d lines
+`,
+					gui.terminal.GetLogicalCursorX(),
+					gui.terminal.GetLogicalCursorY(),
+					gui.terminal.ActiveBuffer().ViewWidth(),
+					gui.terminal.ActiveBuffer().ViewHeight(),
+					gui.terminal.ActiveBuffer().Height(),
+				))
+			}
+
 			gui.window.SwapBuffers()
 
 		}

gui/input.go

@@ -47,6 +47,9 @@ func (gui *GUI) key(w *glfw.Window, key glfw.Key, scancode int, action glfw.Acti
 			case glfw.KeyC:
 				gui.window.SetClipboardString(gui.terminal.ActiveBuffer().GetSelectedText())
 				return
+			case glfw.KeyD:
+				gui.showDebugInfo = !gui.showDebugInfo
+				gui.terminal.SetDirty()
 			case glfw.KeyG:
 				keywords := gui.terminal.ActiveBuffer().GetSelectedText()
 				if keywords != "" {

terminal/terminal.go

@@ -289,13 +289,12 @@ func (terminal *Terminal) SetSize(newCols uint, newLines uint) error {
 	terminal.size.Width = uint16(newCols)
 	terminal.size.Height = uint16(newLines)
 
-	terminal.ActiveBuffer().ResizeView(terminal.size.Width, terminal.size.Height)
-
 	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(terminal.pty.Fd()),
 		uintptr(syscall.TIOCSWINSZ), uintptr(unsafe.Pointer(&terminal.size)))
 	if err != 0 {
 		return fmt.Errorf("Failed to set terminal size vai ioctl: Error no %d", err)
 	}
 
+	terminal.ActiveBuffer().ResizeView(terminal.size.Width, terminal.size.Height)
 	return nil
 }