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Previously, built-in commands were fairly primitive, merely outputting
STDOUT and STDERR with the print! macros. However, we need them to
behave like normal programs, that is:
- Acknowledge their verse's meter (forking, piping, etc.),
- Ability to capture STDOUT and STDERR (>, 2>),
- and Affect the currently running environment.
For these reasons, the anthology was reworked, and now contains the
Anthology struct, which mimics both std::process::{Child, Command}.
The AnthologyStdin helper struct was also created, for built-ins to
take input on STDIN, though no built-in is currently using it.
Each built-ins' incant functions were updated to return a
std::process::Output. It contains output from STDOUT, output from
STDERR, and the exit code of the "process".
A fix was also implemented for aliases, where the STDOUT and STDERR
vectors were not being copied to the newly constructed verse.
Notes:
There is some cleanup that needs to happen on this patch. For one, the
spellcheck function is no longer being used, so there is a generic OS
error if the program cannot be found in the $PATH. Also,
anthology::lookup gets called twice, which shouldn't need to happen.
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