/usr/share/doc/libdist-zilla-perl/todo/external-core-attr.mkdn is in libdist-zilla-perl 5.043-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | # EXTERNALIZE CORE ATTRIBUTES
Right now you can't initialize a Zilla without a few attributes like name,
author, etc. These should be autodetectable, meaning they should be able to
wait until plugin initialization is complete -- or at least underway. (...but
probably until it's complete. It should be possible, for example, to defer
decision on name and version until FileGather-ing is done.)
## STRATEGY?
I think what I want is some simple attribute traits:
has name => (
...
traits => [ qw(WORM Demanded) ],
);
WORM is what it sounds like. Once set, the value cannot be changed. The
writer throws if the predicate returns true.
Demanded means that the accessor is fatal if the predicate is false.
Together, it means you *must initialize* the value before reading it, and you
*must not* try to change it once initialized.
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