started tidying for margin setting

gui/gui.go

@@ -37,7 +37,7 @@ func New(config *config.Config, terminal *terminal.Terminal, logger *zap.Sugared
 		width:     600,
 		height:    300,
 		terminal:  terminal,
-		fontScale: 15.0,
+		fontScale: 14.0,
 	}
 }
 
@@ -121,7 +121,7 @@ func (gui *GUI) Render() error {
 	gl.BindFragDataLocation(program, 0, gl.Str("outColour\x00"))
 
 	gui.logger.Debugf("Loading font...")
-	if err := gui.loadFont("./fonts/envypn-15.ttf"); err != nil {
+	if err := gui.loadFont("./fonts/Hack-Regular.ttf"); err != nil {
 		//if err := gui.loadFont("./fonts/Roboto.ttf"); err != nil {
 		return fmt.Errorf("Failed to load font: %s", err)
 	}

terminal/csi.go

@@ -7,16 +7,33 @@ import (
 )
 
 var csiSequenceMap = map[rune]csiSequenceHandler{
-	'm': sgrSequenceHandler,
+	'd': csiLinePositionAbsolute,
-	'P': csiDeleteHandler,
-	'J': csiEraseInDisplayHandler,
-	'K': csiEraseInLineHandler,
 	'h': csiSetModeHandler,
 	'l': csiResetModeHandler,
-	'd': csiLinePositionAbsolute,
+	'm': sgrSequenceHandler,
-	't': csiWindowManipulation,
-	'X': csiEraseCharactersHandler,
 	'r': csiSetMarginsHandler,
+	't': csiWindowManipulation,
+	'J': csiEraseInDisplayHandler,
+	'K': csiEraseInLineHandler,
+	'P': csiDeleteHandler,
+	'T': csiScrollHandler,
+	'X': csiEraseCharactersHandler,
+}
+
+func csiScrollHandler(params []string, intermediate string, terminal *Terminal) error {
+	distance := 1
+	if len(params) > 1 {
+		return fmt.Errorf("Not supported")
+	}
+	if len(params) == 1 {
+		var err error
+		distance, err = strconv.Atoi(params[0])
+		if err != nil {
+			distance = 1
+		}
+	}
+	terminal.ScrollDown(uint16(distance))
+	return nil
 }
 
 // DECSTBM
@@ -41,12 +58,14 @@ func csiSetMarginsHandler(params []string, intermediate string, terminal *Termin
 			}
 		}
 	}
-	top -= 1
+	top--
-	bottom -= 1
+	bottom--
+
+	terminal.logger.Warnf("Request to set margins from line %d to %d", top, bottom)
 
 	terminal.ActiveBuffer().SetPosition(0, 0)
 
-	return nil
+	return fmt.Errorf("Not supported")
 }
 
 func csiSetMode(modeStr string, enabled bool, terminal *Terminal) error {