I've got a basic button selector working.

I have to add actions for when "pressed", but for my current project
I'm aiming to have a colour selector.  I'll draw the current colour
in a nice little box.  I'll also eventually permit dynamic updates
to specific colours in the table.  This will permit me to
dynamically adjust the colour space.

bin/vulgar.sh

@@ -37,11 +37,36 @@ send_csi_command()
 	echo -n "${_suffix}"
 }
 
+##### START DECCRA Block ############
+
+# These two functions expect DECCRA (DEC Copy Rectangular Area)
+# to work.  It also requires a second page to copy to.
+# I haven't gotten them working, it seems.
+
+save_block()
+{
+	send_csi_command '$v' $* 0 $* 1
+}
+
+restore_block()
+{
+	send_csi_command '$v' $* 1 $* 0
+}
+
+##### END DECCRA Block ##############
+
 erase_block()
 {
+	send_csi_command '*x' 2
+	send_csi_command '$r' ${*} 0
 	send_csi_command '${' ${*}
 }
 
+fill_block_attributes()
+{
+	send_csi_command '$r' ${*}
+}
+
 fill_block_raw()
 {
 	send_csi_command '$x' ${*}
@@ -114,9 +139,200 @@ build_box()
 	draw_box $*
 }
 
+
+# Read a single keypress in raw terminal mode.
+# It will read all codes from the input.
+#
+# Due to read timeouts, it may give odd
+# results on non-interactive terminals.
+read_key()
+{
+	seq=""
+	read -sn 1 key
+	code=`printf "%x" "'$key"`
+	seq=${code}
+	while read -t 0
+	do
+		read -sn 1 key
+		code=`printf "%x" "'$key"`
+		seq="${seq} ${code}"
+	done
+
+	eval $1=\"${seq}\"
+}
+
+translate_key()
+{
+	_codes=${1}
+	case "${codes}" in
+		"1b 5b 41")
+			echo "Up"
+		;;
+
+		"1b 5b 42")
+			echo "Down"
+		;;
+
+		"1b 5b 44")
+			echo "Left"
+		;;
+
+		"1b 5b 43")
+			echo "Right"
+		;;
+
+		"1b")
+			echo "Escape"
+		;;
+
+		*)
+			echo "${codes}"
+		;;
+	esac
+}
+	
+
+
 #erase_block 20 20 30 30
 #fill_block X 21 21 29 29
 #write_char Y 25 25
 
-build_box 8 24 19 99
-write_string "Hello World" 10 26
+#build_box 8 24 19 99
+#write_string "Hello World" 10 26
+
+#read -sn 1 keyA
+#read -sn 1 keyB
+#read -sn 1 keyC
+
+declare -A buttons
+
+create_button()
+{
+	_name=$1
+	_r=$2
+	_c=$3
+	_text=$4
+	_color=$5
+
+	shift 1
+	eval button_${_name}=\"$*\"
+
+	_T=$_r
+	_B=$(( $_r + 2 ))
+
+	_L=$_c
+	_R=$(( $_c + 3 + ${#_text} ))
+
+	erase_block $_T $_L $_B $_R
+	build_box $_T $_L $_B $_R
+	write_string "$_text" $(( $_T + 1 )) $(( $_L + 2 ))
+	if [ -n "$_color" ]
+	then
+		fill_block_attributes $_T $_L $_B $_R "3${_color}"
+	fi
+}
+
+button_stat()
+{
+	_r=$1
+	_c=$2
+	_text=$3
+	_color=$4
+}
+
+
+highlight_button()
+{
+	_name=$1
+	eval _stat="\${button_${_name}}"
+	button_stat ${_stat}
+
+	_T=$_r
+	_B=$(( $_r + 2 ))
+
+	_L=$_c
+	_R=$(( $_c + 3 + ${#_text} ))
+
+	fill_block_attributes $_T $_L $_B $_R 0
+	if [ -n "$_color" ]
+	then
+		fill_block_attributes $_T $_L $_B $_R "4${_color}"
+	else
+		fill_block_attributes $_T $_L $_B $_R '7'
+	fi
+}
+
+unhighlight_button()
+{
+	_name=$1
+	eval _stat="\${button_${_name}}"
+	button_stat ${_stat}
+
+	_T=$_r
+	_B=$(( $_r + 2 ))
+
+	_L=$_c
+	_R=$(( $_c + 3 + ${#_text} ))
+
+
+	fill_block_attributes $_T $_L $_B $_R 0
+	if [ -n "$_color" ]
+	then
+		fill_block_attributes $_T $_L $_B $_R "3${_color}"
+	fi
+}
+
+	
+
+
+
+erase_block 11 1 15 32
+
+create_button Red 12 2 Red 1
+highlight_button Red
+#build_box 12 2 14 8
+#write_string "Red"  13 4
+#fill_block_attributes 12 2 14 8 41
+
+create_button Green 12 12 Green 2
+#build_box 12 12 14 20
+#write_string "Green" 13 14
+
+create_button Blue 12 24 Blue 4
+#build_box 12 24 14 31
+#write_string "Blue" 13 26
+
+Buttons=("Red" "Green" "Blue")
+Index=0
+
+while true
+do
+	read_key codes
+	sym=`translate_key ${codes}`
+
+	OldIndex=${Index}
+
+	if [ "${sym}" == "Right" ]
+	then
+		if (( ${Index} < $(( ${#Buttons} - 1 )) ))
+		then
+			Index=$(( ${Index} + 1 ))
+
+			unhighlight_button ${Buttons[${OldIndex}]}
+			highlight_button ${Buttons[${Index}]}
+		fi
+	elif [ "${sym}" == "Left" ]
+	then
+		if (( ${Index} > 0 ))
+		then
+			Index=$(( ${Index} - 1 ))
+
+			unhighlight_button ${Buttons[${OldIndex}]}
+			highlight_button ${Buttons[${Index}]}
+		fi
+	elif [ "${sym}" == "Escape" ]
+	then
+		#erase_block 11 1 15 32
+		break
+	fi
+done