Saving

The live ISO saves nothing: save fails and home returns -1. To keep your work, install Subverge to a disk image.

An installed system saves automatically after each line that changes the world, each root edit that builds and each back. save writes everything immediately. home returns the number of the drive Subverge is installed on.

Slots

An installed disk has five slots of 1 MiB. Slot 0 is root, and slots 1 to 4 are the tabs. Only the tab that changed gets rewritten.

What's in a slot

A slot holds plain omega source. A tab is saved as its definitions, oldest first, followed by its stack:

# saved world
[ dup * ] :sq2
[ { a b } a a * b b * + ] :hyp
1 2 3

Root is saved as each unit's source after its #>> name line. At boot each slot is run as if it had been typed.

Only values that can be written as source survive. Integers, strings, quotes, symbols, ordinals and cardinals do. Memory from alloc doesn't, so a saved address is meaningless after a reboot.

Not saved

The back history, the prompt history, tab titles, the screen contents and raw memory are not saved.

Damaged slots

A slot whose checksum doesn't match is treated as empty, and that tab boots fresh. A damaged root slot falls back to the kernel's built-in root.

A world or root larger than 1 MiB is silently not saved.