https://github.com/pstolarz/cmdopts

GNU-like command line options parser in Rust
https://github.com/pstolarz/cmdopts

Last synced: 3 months ago
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GNU-like command line options parser in Rust

• Host: GitHub
• URL: https://github.com/pstolarz/cmdopts
• Owner: pstolarz
• License: bsd-2-clause
• Created: 2023-05-20T20:47:13.000Z (about 2 years ago)
• Default Branch: master
• Last Pushed: 2024-12-15T21:44:23.000Z (7 months ago)
• Last Synced: 2025-04-12T04:13:55.712Z (3 months ago)
• Language: Rust
• Homepage:
• Size: 27.3 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# Command Line Options Parser

Simple command line parser in Rust.

`cmdopts` parses GNU-like command line options for 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.

## Options Format

### Short format

All options starting with a single hyphen character `-` are short options. For

example: `-a -b -c` constitute 3 short options. These options may grouped into

a 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, 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.

### Long format

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 white-space(s):

`--config=FILE` or `--config FILE`.

## Usage

See enclosed [`examples`](examples) for details.

## License

2 clause BSD license. See [`LICENSE`](LICENSE) file for details.