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# Cursor-based motions.
#
# To build a disk image:
# ./translate apps/ex7.mu # emits code.img
# To run:
# qemu-system-i386 code.img
#
# Expected output: an interactive game a bit like "snakes". Try pressing h, j,
# k, l.
fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
set-cursor-position screen, 0, 0
{
draw-cursor screen, 0x20/space
var key/eax: byte <- read-key keyboard
{
compare key, 0x80/left-arrow
break-if-!=
draw-code-point-at-cursor screen, 0x2d/dash, 0x31/fg, 0/bg
move-cursor-left 0
}
{
compare key, 0x81/down-arrow
break-if-!=
draw-code-point-at-cursor screen, 0x7c/vertical-bar, 0x31/fg, 0/bg
move-cursor-down 0
}
{
compare key, 0x82/up-arrow
break-if-!=
draw-code-point-at-cursor screen, 0x7c/vertical-bar, 0x31/fg, 0/bg
move-cursor-up 0
}
{
compare key, 0x83/right-arrow
break-if-!=
var g/eax: code-point <- copy 0x2d/dash
draw-code-point-at-cursor screen, 0x2d/dash, 0x31/fg, 0/bg
move-cursor-right 0
}
loop
}
}
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