added cursor and added pen up pen down with keys t and y

readme.md

@@ -8,5 +8,5 @@ the cursive plaintext snake writer
 toekomstmuziek:
 * build a more TUI like interface where we don't clear the screen
 * removing the flasing effect while drawing.
-* put a blinking cursor where the snake currently is
-* implement pen-up and pen-down
+* ~~Put a blinking cursor where the snake currently is~~ implemented
+* ~~implement pen-up and pen-down~~ unit ready

snakelogan

@@ -4,7 +4,7 @@
 _STTY=$(stty -g)    # Save current terminal setup
 printf   "\e[2J"    # clear screen, set cursos at beginning
 stty -echo -icanon  # Turn off line buffering
-printf '\e[?25h'
+printf '\e[?25h'		# Turn on the cursor 
 
 # VARIABLES
 typeset -A IMAGE
@@ -17,6 +17,7 @@ snake='═'
 vertical=false
 forward=true
 upward=true
+pen_down=true
 
 function get_size() {
     # Get terminal size ('stty' is POSIX and always available).
@@ -34,6 +35,7 @@ function start_the_snake() {
 			IMAGE["${i};${j}"]=' ' ; printf ${IMAGE["${i};${j}"]}
 		done
 	done
+	printf '\e[2J\e[H' ; printf '\e[0;24H'
 }
 
 function save_the_snake() {
@@ -56,6 +58,7 @@ function show_the_snake() {
 			printf ${IMAGE["${i};${j}"]}
 		done
 	done
+	printf '\e[%s;%sH' "$((Y+1))" "$((X+1))"
 }
 function at_exit() {
 	printf "\e[?9l"          # Turn off mouse reading
@@ -75,10 +78,14 @@ function move_snake_up() {
 		else
 			snake='╚'
 		fi
-		IMAGE["${Y};${X}"]=$snake ; Y=$((Y-1)) ; vertical=true ; upward=true
 	else
-		snake='║' ; IMAGE["${Y};${X}"]=$snake ; Y=$((Y-1))
+		snake='║'
 	fi
+	#draw nothing it the pen is not down
+	if [ "$pen_down" = false ] ; then
+		snake=' '
+	fi
+	IMAGE["${Y};${X}"]=$snake ; Y=$((Y-1)) ; vertical=true ; upward=true
 }
 
 function move_snake_down() {
@@ -88,10 +95,14 @@ function move_snake_down() {
 		else
 			snake='╔'
 		fi
-		IMAGE["${Y};${X}"]=$snake ; Y=$((Y+1)) ; vertical=true ; upward=false
 	else
-		snake='║' ; IMAGE["${Y};${X}"]=$snake ; Y=$((Y+1))
+		snake='║'
+	fi
+	#draw nothing it the pen is not down
+	if [ "$pen_down" = false ] ; then
+		snake=' '
 	fi
+	IMAGE["${Y};${X}"]=$snake ; Y=$((Y+1)) ; vertical=true ; upward=false
 }
 
 function move_snake_forward() {
@@ -101,10 +112,14 @@ function move_snake_forward() {
 		else
 			snake='╚'
 		fi
-		IMAGE["${Y};${X}"]=$snake ; X=$((X+1)) ; vertical=false ; forward=true
 	else
-		snake='═' ; IMAGE["${Y};${X}"]=$snake ; X=$((X+1))
+		snake='═'
 	fi
+	#draw nothing it the pen is not down
+	if [ "$pen_down" = false ] ; then
+		snake=' '
+	fi
+	IMAGE["${Y};${X}"]=$snake ; X=$((X+1)) ; vertical=false ; forward=true
 }
 
 function move_snake_backward() {
@@ -114,15 +129,20 @@ function move_snake_backward() {
 		else
 			snake='╝'
 		fi
-		IMAGE["${Y};${X}"]=$snake ; X=$((X-1)) ; vertical=false ; forward=false
 	else
-		snake='═' ; IMAGE["${Y};${X}"]=$snake ; X=$((X-1))
+		snake='═'
+	fi
+	#draw nothing it the pen is not down
+	if [ "$pen_down" = false ] ; then
+		snake=' '
 	fi
+	IMAGE["${Y};${X}"]=$snake ; X=$((X-1)) ; vertical=false ; forward=false
 }
 
 # Main #
 get_size
 start_the_snake
+echo 
 while read -s -k 1 cr;
 do
 	case "$cr" in
@@ -130,6 +150,8 @@ do
 		s)	move_snake_down ; show_the_snake ;;
 		a)	move_snake_backward ; show_the_snake ;;
 		d)	move_snake_forward ; show_the_snake ;;
+		t)  pen_down=true ;;
+		y)  pen_down=false ;;
 		q)	save_the_snake && at_exit ;;
 	esac
 done