Add 256 colour support

demo/256.sh

@@ -0,0 +1,12 @@
+
+#!/bin/bash
+
+for i in {0..255} ; do
+	    printf "\x1b[48;5;%sm%3d\e[0m " "$i" "$i"
+	        if (( i == 15 )) || (( i > 15 )) && (( (i-15) % 6 == 0 )); then
+			        printf "\n";
+				    fi
+			    done
+
+
+

terminal/csi.go

@@ -52,8 +52,7 @@ func csiInsertLinesHandler(params []string, intermediate string, terminal *Termi
 		}
 	}
 	terminal.logger.Debugf("Inserting %d lines", count)
-	panic("Not supported")
+	return fmt.Errorf("Not supported")
-	return nil
 }
 
 func csiScrollDownHandler(params []string, intermediate string, terminal *Terminal) error {

terminal/sgr.go

@@ -2,14 +2,19 @@ package terminal
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/liamg/aminal/buffer"
 )
 
 func sgrSequenceHandler(params []string, intermediate string, terminal *Terminal) error {
 
-	for i := range params {
+	if len(params) == 0 {
-		param := params[i]
+		return nil
+	}
+
+	param := params[0]
+
 	switch param {
 	case "00", "0", "":
 		attr := terminal.ActiveBuffer().CursorAttr()
@@ -109,11 +114,91 @@ func sgrSequenceHandler(params []string, intermediate string, terminal *Terminal
 		terminal.ActiveBuffer().CursorAttr().BgColour = terminal.config.ColourScheme.LightCyan
 	case "107":
 		terminal.ActiveBuffer().CursorAttr().BgColour = terminal.config.ColourScheme.White
+	case "38": // set foreground
+		if len(params) > 2 {
+			switch params[1] {
+			case "5":
+				// 8 bit colour
+				colNum, err := strconv.Atoi(params[2])
+				if err == nil && colNum < 256 && colNum >= 0 {
+					terminal.ActiveBuffer().CursorAttr().FgColour = get8BitSGRColour(uint8(colNum), terminal)
+				}
+			case "2":
+				// 24 bit colour
+			}
+		}
+	case "48": // set background
+		if len(params) > 2 {
+			switch params[1] {
+			case "5":
+				// 8 bit colour
+				colNum, err := strconv.Atoi(params[2])
+				if err == nil && colNum < 256 && colNum >= 0 {
+					terminal.ActiveBuffer().CursorAttr().BgColour = get8BitSGRColour(uint8(colNum), terminal)
+				}
+			case "2":
+				// 24 bit colour
+			}
+		}
 	default:
 		return fmt.Errorf("Unknown SGR control sequence: (ESC[%s%sm)", param, intermediate)
 	}
 
 	//terminal.logger.Debugf("SGR control sequence: (ESC[%s%sm)", param, intermediate)
-	}
+
 	return nil
 }
+
+func get8BitSGRColour(colNum uint8, terminal *Terminal) [3]float32 {
+
+	// https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit
+
+	switch colNum {
+	case 0:
+		return terminal.config.ColourScheme.Black
+	case 1:
+		return terminal.config.ColourScheme.Red
+	case 2:
+		return terminal.config.ColourScheme.Green
+	case 3:
+		return terminal.config.ColourScheme.Yellow
+	case 4:
+		return terminal.config.ColourScheme.Blue
+	case 5:
+		return terminal.config.ColourScheme.Magenta
+	case 6:
+		return terminal.config.ColourScheme.Cyan
+	case 7:
+		return terminal.config.ColourScheme.White
+	case 8:
+		return terminal.config.ColourScheme.DarkGrey
+	case 9:
+		return terminal.config.ColourScheme.LightRed
+	case 10:
+		return terminal.config.ColourScheme.LightGreen
+	case 11:
+		return terminal.config.ColourScheme.LightYellow
+	case 12:
+		return terminal.config.ColourScheme.LightBlue
+	case 13:
+		return terminal.config.ColourScheme.LightMagenta
+	case 14:
+		return terminal.config.ColourScheme.LightCyan
+	case 15:
+		return terminal.config.ColourScheme.White
+	}
+
+	if colNum < 232 {
+
+		index := int(colNum - 16) // 0-216
+		rgb := (index * 0xffffff) / 216
+		r := float32((rgb&0xff0000)>>16) / 0xff
+		g := float32((rgb&0xff00)>>8) / 0xff
+		b := float32(rgb&0xff) / 0xff
+
+		return [3]float32{r, g, b}
+	}
+
+	c := float32(colNum-232) / 0x18
+	return [3]float32{c, c, c}
+}