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This patch overhauls the reading and reciting of verses, such that the
redirection of STDERR (in addition to STDOUT, which was already a
feature), is now possible.
Removed the 'stdout' argument from recite(), since it is no longer
needed with how incantations function.
A verse's couplet indicator is now a u8, instead of a bool, with certain
values corresponding to types of couplets, for instance:
ls | grep Ca | lolcat
^ ^ ^
| | 2: right side of a couplet
| 3: both sides of a couplet
1: left side of a couplet
Incantions are no longer hanlded in rune.rs, and the task macros have
been removed. Now, a verse incants itself, matching on its own meter to
determine how to handle the next verse.
The following runes were added to help with handling STDERR:
Write2 -> 2>
WriteAll -> &>
Addendum2 -> 2>>
AddendumAll -> &>>
The 'io' field in verse was changed from an Option<Rune>, to an array of
Runes, since a single verse might have multiple IO operations.
The following fields were added to Verse, to assist with handling
STDERR:
ip -> List of filenames to read into STDIN
op -> List of filenames to send STDOUT to
ep -> List of filenames to send STDERR to
Keep track of channels when reading a poem. Channels are relating to IO
operations. If channel is None, words get pushed to the verse's primary
stanza (i.e. the verb or the clause). If a channel is selected, words
are pushed to one of the aforementioned new fields in Verse.
Read -> ip
Write/Addedum -> op
Write2/Addedum2 -> ep
WriteAll/AddendumAll -> op and ep
Notes:
This commit also added tests for the new Runes.
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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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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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Add back tests for Rune::Read, Rune::Write, and Rune::Addendum,
following the new parser output. Also, renames some tests, since Read,
Write, and Addendum are no longer meters.
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Fix the ~ test, so that it uses env!("HOME"), instead of my hard-coded
home directory.
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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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