Simple command line parser in Rust.
cmdopts supports GNU-like command line options parsing with long and short
formats. Optional argument (aka option's value) may be associated with an option.
The parsing routine parse_opts() accepts two user callbacks:
* opt_i() provides parser with a context the parsed option may be used,
* opt_h() is the actual handler of the option.
The library doesn't interpret parsed options, rather passes them to the user's
handler to further processing. The idea is similar to getopt(3) and getopt_long(3)
routines.
All options starting with single hyphen character - are short options. For
example: -a -b -c constitute 3 short options. These options may grouped into
single block of options as -abc.
If a short option requires an argument, the argument may be provided directly
after the option or separated by white space(s): -dARG or -d ARG.
If short options are grouped into a block, one the last one may be provided
with an argument. For example: -abcdARG or -abcd ARG is equivalent to
-a -b -c -d ARG, where -a -b -c don't have an argument, while -d
does.
If an option starts with -- it's long format option. For example --help.
Long options may not be formed into a group. An argument may be provided to
the long-format option directly after = character or followed by whitespace(s):
--config=FILE or --config FILE.
See enclosed examples for details.
2 clause BSD license. See LICENSE file for details.