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Remove some defunct code that was previously used to check for special
runes.
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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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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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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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