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Implication: os.rename now needs to be sandboxed. Hopefully it's
tractable to treat it as conceptually identical to opening two files.
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The trouble with os.tmpname() is that it always creates in /tmp.
If /tmp is in a different volume from our real filename, os.rename()
will fail.
This new primitive doesn't support primitive paths yet.
I'm also again nervous about the security implications of my whole
approach. What if we create an inner function called start_writing?
Would we be able to do anything inside it? I'm starting to suspect this
whole approach of going by caller name is broken. An app could also
create inner functions called 'main'..
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Perhaps this is a bad idea. It feels arbitrary, what methods Lua happens
to include in string and table objects without having to go through the
respective modules.
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Looks like Lua's local functions lose access to outer scopes (upvalues)
or something like that..
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When should code go in the template used by new apps vs the .lua files
distributed with Teliva?
- from a privilege perspective there's no difference
- from a compatibility perspective stuff in .tlv will not get upgraded
with Teliva.
- for me the maintainer, functions in .lua files are easier to upgrade
in a single place.
- for the reader of an app, functions in .lua files will not show up to
be edited. They can still be overloaded, but the current version isn't
as discoverable. Putting something in the app is a slight nudge to
readers that they're encouraged to mess with it.
- Stuff in .lua files can use local functions and so have more internal
complexity. Apps can also hide details within functions, but that'll
make them more likely to run into limitations with Teliva's editing
environment.
I'm not yet sure how to reason about the second point in practice.
- Stuff in .tlv files I don't have to worry about compatibility
guarantees for.
- Stuff in .lua files I _do_ have to worry about compatibility
guarantees for.
Perhaps this means I'm doing things exactly wrong in this commit?
Functions like map/reduce/filter/append seem more timeless, whereas I'm
still just feeling my way around with start_reading and start_writing.
We'll see. For now I'm ruled by the fourth point. Messing with tasks and
the scheduler is much more advanced than anything else in template.tlv;
it seems to make sense to add some friction to modifying them.
Bottomline: Complex sub-systems go in .lua files. Simple, self-contained
definitions go into apps. Both are probably equally burdensome now from
a compatibility perspective.
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