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I can't believe I didn't notice this until now.
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In each session, Teliva has to bootstrap a trusted channel with the
computer owner while running arbitrarily untrusted code. So let's get
really, really precise about what the trusted channel consists of:
- the bottom-most row of screen containing the menu
- the keystrokes the owner types in
- ncurses COLOR_PAIR slots 254 (menu) and 255 (error)
One reason the menu colors are important: we don't want people to get
used to apps that hide the menu colors by setting default
foreground/background to invisible and then drawing their own menu one
row up.
The error COLOR_PAIR I don't see any reason to carve out right now, but
it seems like a good idea for Teliva the framework to not get into the
habit of apps doing some things for it.
I'm not sure how realistic all this is (I feel quite ill-equipped to
think about security), but it seems worthwhile to err on the side of
paranoia. Teliva will be paranoid so people don't have to be.
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It turns out Lua has been providing us this information all along! I'd
just not created the space on screen to show it. Make it persist better.
Kilo now no longer tracks its own status messages, which is a regression
in a rare condition.
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One old drawback now has a new look. Before, we loaded definitions in
order, so global definitions had to exist before other global
definitions that used them. See window and grid in life.tlv. Now we load
definitions in reverse order, so initialization needs to change. Worse,
if we update window, we need to edit grid just to fix the order.
This implies that we can't yet optimize away bindings where there are no
new changes.
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Looks like Lua supports a little bit of programmability in its
multi-line string literals. Even though I can't find this documented
anywhere.
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Plan is for this to be the default representation for Teliva programs.
Text-friendly but not meant to be edited directly as text. Will
eventually include both code and data definitions, both current snapshot
and past revision history.
Right now .tlv files seem to run. Error checking is non-existent,
because I don't understand Lua's idioms around 'status' yet. Opening the
editor expectedly segfaults.
This commit is the most mind-bending bit of code I've written in a long
time.
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