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The last commit (1415c8f9b89699000ef8d864ff8f0e1bebca4a5f) fixed the
issue with pipes, however, it did not fix it for IO. This patch adds
some logic for the aliased verse to inherit the properties of the
original verse, so that recite works properly for all verse types
(regardless of IO, couplet, or meter).
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Fixed a regression that was introduced in:
1415c8f9b89699000ef8d864ff8f0e1bebca4a5f.
Moving aliases to read() broke how pipes worked. This commit removes the
troublesome append!() macro, and replaces it with some logic in the
add() function (impl Appendable for Poem).
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Remove some defunct code that was previously used to check for special
runes.
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Sort the output of the built-in 'export' and 'alias' commands, in cases
where all environment variables/aliases are printed out.
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This patches fixes a bug, where sometimes, when a Rune::String was
detected, the resulting string from the string!() macro wasn't getting
pushed to the current verse.
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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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Instead of handling aliases in the recite() function, which requires two
loops to handle properly with the current implementation, offload
checking for aliases to the read() function.
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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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Previously, if an environment variable was given in a string, such as:
'$PATH' or "$PATH", both would be replaced with the value of $PATH from
the environment. However, for single quotes strings, any values inside
should be taken at face value. In other words, echo '$PATH' should
simply write out: $PATH, and not whatever environment value $PATH
happens to be. This patch replaced '$' in single quoted strings with
the ASCII shift out (x0e) character. Any ASCII SO placeholder is
replaced with a '$' in recite(), after the environment variables have
been accounted for.
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Replaced all (non-test) instances of env!("HOME") with env::var("HOME").
The env! macro should only be used in instances where the environment
variable should be resolved during compile time.
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Add some better comments/move around existing comments to make some of
the actions in recite() more clear.
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This patch fixes a bug for internal poems, where the output would always
get split on newlines, regardless of the verse's verb. This breaks
things like 'export DIR=`ls`', since output from `ls` might have
newlines, meaning that $DIR will only contains the first item from the
`ls` command. This will only perform the newline split when sending the
output to a non-builtin command.
Notes:
This fix works for export (and alias), but could cause issues with other
builtins in the future. Worth keeping an eye on this, as this probably
isn't a perfect solution.
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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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The parser will now interpret the '#' character as a single-line comment
string, which works on it's own line, or at the end of an existing line.
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Rename the path::prefresh() function to path::refresh(). Calling
convention should be to `use crate::path;` or `mod path;`, and then call
path::refresh(...), for verbosity.
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Remove some commented out code, that is no longer needed after the
parser overhaul.
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Add docstring for `incant_quiet_io`.
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Rebuilt the LR parser (i.e. read()) from the ground up. This required
that some changes be made to recite(), in order to accomodate the new
data structures. These data structures were each split out into their
own file, in order to make working with each component a bit easier.
In addition to reworking the parts of the parser already present, some
new features were also added, such as:
- Support for strings (' and ")
- Support for environment variables ($)
- Support for interpreting tild as $HOME (~)
- Support for sub-reading and sub-reciting (`)
Notes:
This is a huge commit that changes almost the entire program (main.rs is
still the same, except for imports). Ideally, huge sweeping changes like
this should not occur on the codebase, but since this is still
pre-alpha, I guess this is acceptable. This is far from the end of
patch set, however, as there is quite a lot of cleanup that needs to be
done. For instance, checking for internal poems and environment
variables should get split out to their own functions/macros. There is
also some defunct code (that's commented out), that is unlikely to be
useful in the future.
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