| Commit message (Collapse) | Author | Age | Files | Lines |
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Added the following macros:
push!: Creates a Verse from a stanza, taking into account some extra
options (such as the Meter).
push1!: Creates a Verse from a stanza, but also allows looking ahead
by a single character, in order to pattern match certain meters (i.e.
And ('&&') and Addendum ('>>')).
Replaced the code in the huge, redundant match statements in Poem::read
with the macros described above.
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Added six new units tests related to the IO meters (Read, Write, and
Addendum). The first three tests check the meters under normal operation
, and the last three tests ensures that the parser throws an error,
unless one or more files where specified for the operation.
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Clear the 'out' buffer after we have written STDOUT to the files
specified after the Meter::Write or Meter::Addendum verse.
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Remove commented code relating to error checks for the incant_io
functions. The parser should detect if no files where specified for
Meter::Read, Meter::Write, or Meter::Addendum, meaning that these checks
are not necessary.
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Added the following file redirection capabilies:
- '<': Read input into STDIN
- '>': Write STDOUT to file
- '>>': Append STDOUT to file
If no files are specified, this counts as a parser error, and so no code
will be executed, even when used in combination with the string (';')
meter. Currently, there is no way to redirect STDERR.
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Keep track of a new atomic variable: at_prompt, which is set to true
just before blocking on io::stdin.read_line, and set to false just
calling Poem::read. Additionally, for background tasks, there is a new
ps macro called btask, which changes the process group of commands that
are forked into the background, so that they don't receive SIGINT from
the keyboard.
Notes:
Changing the process group on the Command is done via CommandExt. More
details here:
https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.process_group
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Added twelve different tests for the parser (Poem::read).
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Added a match statement in the main parser loop that pushes a new verse
into the poem if a newline is found. This might happen if parsing a poem
from a file.
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Added documentation comments for the Meter::incant_ functions,
describing how each function operates.
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Added an index to keep track of what position each char is at in the
loop. Added a more verbose error message, which prints out the column
that the parse error was detected, as well as the glyph that threw the
error. Added more comments to the '&', whitespace, and char match
statements. Changed parser behavior, so that a ';' glyph without a
stanza does not cause a parser error.
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Moved the 'couplet' and 'metered' variables into functions impl'd for
Verse. This cuts down on the boilerplate in the parsing loop, and also
makes it so that their match statements are only ran when needed, rather
than being called at every iteration of the loop.
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Introduce a switch to break from recite() if the forked process returns
a non-zero exit code. The one except to this, is when using semicolons,
then we do not care if the previous command failed.
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Removes the custom errors in src/recite/erro.rs, and replaces them with
std::io::Errors throughout (recite(), incant_, macros).
Fixed a bug with the way forking to the background is handled, where
registering the signal handler in main for all processes would break
couplets (i.e. pipes). Instead, this sets up a new signal handler each
time a process is forked into the background. It uses a Vec<i32> to keep
track of all the background processes.
Notes:
First off, there is some defunct code in the main repl loop, which is an
example of killing zombie processes after each prompt. This should be
removed, but I kept it in, just in case I go back to it for some reason.
To be honest, I have no clue why this code works. In theory, I should
have to remove the pid from the pids: Vec<i32> if waitpid returns a
positive integer. However, when I tried this, it completely broke the
program. ¯\_(ツ)_/¯
Also, it's worth noting that registering a signal handler with
signal_hook::low_level::register, is somewhat costly, according to their
docs. Given that this only occurs for background processes that are
forked, however, I think it is acceptable.
Finally, we never unregister the signal handler, so I'm not sure if
that's still hanging out in memory somewhere or no.
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First off, moved the giant match statements out of recite(), and into
macros in src/recite/ps.rs. There still needs to be two, since any verse
using the 'couplet' meter will need to redirect its STDOUT. Now the
recite() function returns a Result<(), Mishap>, which can be invoked
when calling the incant_ functions.
Custom errors were added in the form of 'Mishap''s. They are intended to
be returned from the incant_ functions, in the event that something goes
wrong with the Command::spawn() or Child::wait(). They each take a
String, which should be the verb or stanza that was entered by the user.
The incant_ functions separate the functionality of each type of meter
from the recite() function. They return a Result<i32, Mishap>, where
i32 is the exit code of the program that ran, and Mishap is a possible
error.
Before, the shell was cheating at forking a process to the background.
It would actually spawn a thread to wait for that process to finish.
Now, the program simply registers a handler for SIGCHLD, and uses libc's
waitpid() function to reap the child process, and print some output to
the user, indicating that it's finished.
Notes:
This was a huge patch which did some desperately needed cleanup of the
recite() function. Moving forward, will need to add more documentation,
and will probably scrap the custom errors, since this implementation is
a little half-baked. It's worth looking into in the future, but we can
probably live with io::Error's for the time being.
Fixing forking was a pretty big deal, though. In Linux, and other
u**x-like operating systems, parent processes need to reap their child
processes, otherwise they become zombies. Previously, the dwvsh did this
by spawning a separate thread to wait for child processes that were
forked to the background. Now, we are registering a handle for SIGCHLD,
which is a signal that gets sent to the parent when one of their
children finishes, or is killed. Using waitpid(2), we can determine
which process ended, and do something about it. In the case of a
processes that was forked into the background, when it finished,
waitpid(2) will return its PID. For foreground processes, it returns -1.
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Broke out the structs for a poem into their own file: src/recite.rs.
Also put the 'prefresh' function into it's own file: src/recite/path.rs.
Commented most of the parser code (including structs and helper methods
related to parsing (i.e. Verse, Stanza, Meter, Poem)). Renamed any
instance of the 'paths' variable to 'path'.
Notes:
The biggest task now is to cleanup Poem::recite. It has a ton of bogus
error messages, and (seemingly) redundant code.
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