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# Experimental Mu shell
# A Lisp with indent-sensitivity and infix.
fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
var globals-storage: global-table
var globals/edi: (addr global-table) <- address globals-storage
initialize-globals globals
var sandbox-storage: sandbox
var sandbox/esi: (addr sandbox) <- address sandbox-storage
initialize-sandbox sandbox, 1/with-screen
load-state data-disk, sandbox, globals
{
render-globals screen, globals, 0/x, 0/y, 0x40/xmax, 0x2f/screen-height-without-menu
render-sandbox screen, sandbox, 0x40/x, 0/y, 0x80/screen-width, 0x2f/screen-height-without-menu, globals
{
var key/eax: byte <- read-key keyboard
compare key, 0
loop-if-=
# no way to quit right now; just reboot
edit-sandbox sandbox, key, globals, screen, keyboard, data-disk
}
loop
}
}
# Gotcha: some saved state may not load.
fn load-state data-disk: (addr disk), _sandbox: (addr sandbox), globals: (addr global-table) {
var sandbox/eax: (addr sandbox) <- copy _sandbox
var data-ah/eax: (addr handle gap-buffer) <- get sandbox, data
var _data/eax: (addr gap-buffer) <- lookup *data-ah
var data/esi: (addr gap-buffer) <- copy _data
# data-disk -> stream
var s-storage: (stream byte 0x800) # space for 4/sectors
var s/ebx: (addr stream byte) <- address s-storage
load-sectors data-disk, 0/lba, 4/sectors, s
#? draw-stream-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, s, 7/fg, 0/bg
# stream -> gap-buffer
load-gap-buffer-from-stream data, s
clear-stream s
# read: gap-buffer -> cell
var initial-root-storage: (handle cell)
var initial-root/ecx: (addr handle cell) <- address initial-root-storage
read-cell data, initial-root, 0/no-trace
clear-gap-buffer data
#
{
var initial-root-addr/eax: (addr cell) <- lookup *initial-root
compare initial-root-addr, 0
break-if-!=
return
}
# load globals from assoc(initial-root, 'globals)
var globals-literal-storage: (handle cell)
var globals-literal-ah/eax: (addr handle cell) <- address globals-literal-storage
new-symbol globals-literal-ah, "globals"
var globals-literal/eax: (addr cell) <- lookup *globals-literal-ah
var globals-cell-storage: (handle cell)
var globals-cell-ah/edx: (addr handle cell) <- address globals-cell-storage
lookup-symbol globals-literal, globals-cell-ah, *initial-root, 0/no-globals, 0/no-trace, 0/no-screen, 0/no-keyboard
var globals-cell/eax: (addr cell) <- lookup *globals-cell-ah
compare globals-cell, 0
{
break-if-!=
return
}
load-globals globals-cell-ah, globals
# sandbox = assoc(initial-root, 'sandbox)
var sandbox-literal-storage: (handle cell)
var sandbox-literal-ah/eax: (addr handle cell) <- address sandbox-literal-storage
new-symbol sandbox-literal-ah, "sandbox"
var sandbox-literal/eax: (addr cell) <- lookup *sandbox-literal-ah
var sandbox-cell-storage: (handle cell)
var sandbox-cell-ah/edx: (addr handle cell) <- address sandbox-cell-storage
lookup-symbol sandbox-literal, sandbox-cell-ah, *initial-root, 0/no-globals, 0/no-trace, 0/no-screen, 0/no-keyboard
var sandbox-cell/eax: (addr cell) <- lookup *sandbox-cell-ah
compare sandbox-cell, 0
{
break-if-!=
return
}
# print: cell -> stream
print-cell sandbox-cell-ah, s, 0/no-trace
# stream -> gap-buffer
load-gap-buffer-from-stream data, s
}
# Save state as an alist of alists:
# ((globals . ((a . (fn ...))
# ...))
# (sandbox . ...))
fn store-state data-disk: (addr disk), sandbox: (addr sandbox), globals: (addr global-table) {
compare data-disk, 0/no-disk
{
break-if-!=
return
}
var stream-storage: (stream byte 0x800) # space enough for 4/sectors
var stream/edi: (addr stream byte) <- address stream-storage
write stream, "(\n"
write-globals stream, globals
write-sandbox stream, sandbox
write stream, ")\n"
store-sectors data-disk, 0/lba, 4/sectors, stream
}
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