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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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Added a built-in which command (for MacOS and BSD), which can check
aliases, and other shell built-in commands, in addition to bins on the
$PATH.
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Previously, the recite() function created the 'out' variable, which was
a String, that got passed to the various incant functions, in order to
capture STDOUT in certain situations. In cases where STDOUT was
captured, it was first converted to a String, and then appended to the
'out' variable, by means of String::from_utf8_lossy(). This works for
basic text, however, does NOT work for binary data. This becomes
problematic, when for example, downling a tar file with curl/wget, that
is then piped ('|') to the tar program. Using from_utf8_lossy() in this
case can corrupt the tar file. This patch makes it so that out is stored
as bytes by default, and only converted to a String when necessary.
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Make sure to interpret alias values as their own poems, since aliases
can be fairly complex.
Notes:
Previously, I was doing a simple find and replace for aliases within
each verse. However, aliases can be fairly complex, containing their own
range of meters, commands, and io operations. This could cause problems,
since a verse should never have, for instance, a pipe (`|`) in the
middle of it. This patch fixes it, so that we iterate once through the
poem, generating a new poem based on aliases that are found. In order to
avoid two loops in the recite() function, it might make sense to offload
handling aliases to read().
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Add documentation for anthology::lookup(), with a list containing all
the default aliases for builtin commands.
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Add docstring comments for all the incant function throughout the
anthology, documenting what each function does, and an example of it's
shell command.
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Add the 'unset' command to remove global environment variable
definitions from the shell.
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The shell now has support for aliases (via alias foo=bar). The 'unalias'
command is also available to remove aliases. Finally,
Environment::aliases was changed to be a HashMap<String, String>,
instead of a Vec<String>.
Since the verse's verb might change (for instance, it is an environment
variable, or an alias), add another check in Poem::recite, which simply
continues, instead of running the spellchecker, if the verb is empty.
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Need to include line to import compose::Environment.
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Instead of having to pass around a bunch of different data structures
for various shell functions, create the wrapper compose::Environment,
which serves as a global shell state. It is configured via
login/profile/rc scripts initially, but can of course be modified
throughout the lifetime of the shell.
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Use $PATH, instead of a hard-coded PATH from main(). This means that
there is no longer a need to pass around PATH to
repl()/recite()/path::refresh(), since path::refresh() can call env::var
directly.
Since the hard-coded paths were removed, there needs to be some way to
define $PATH. When running the debug build, dwvsh will look in
'dist/etc/dwvshrc' for the initial environment setup. For the release
target, dwvsh will look in '/etc/dwvshrc'. After the global rc file is
sourced, dwvsh will try to source ~/.dwvshrc if it exists, so users can
extend their environment without root access (assuming a release install).
Notes:
Throughout a lot of this program, we're calling `env!("HOME")`, in order
to get the user's home directory. Technically, this is not correct. The
env!() macro resolves environment variables during compile time, while
env::var() gets environment variables for the running process (i.e. the
shell). See https://users.rust-lang.org/t/env-vs-env-var/88119 for more
info. In the near future, this will need to be addressed. Might be worth
looking into what other shells do, though one idea I had was to invoke
'/usr/bin/id', grab the user's ID, and use it to grab the rest of the
info from /etc/passwd. This would be handled in an /etc/dwvlogin or
/etc/dwvprofile most likely.
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The anthology module was added to run built-in commands. The 'cd' and
'exit' built-ins were moved from the main recite() loop to this module.
Additionally, the 'export' and 'source' built-ins were added.
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