lexopt

This release adds a new preferred way to cast OsString into String (.string()?) and makes raw argument processing more flexible.

Almost no programs should need changes to keep working, but .string()? makes it easier to use lexopt with other error types like anyhow's and using it is therefore recommended.

New:

• Add ValueExt::string() as the preferred method for converting from OsString into String. Unlike OsString::into_string() it has a normal error type so it's compatible with catch-all error types like anyhow::Error. (#10)
  • into_string()? will stay supported for the time being.
• Add RawArgs::as_slice() for unlimited lookahead. (#15)
• Add Parser::try_raw_args() to get raw arguments without consuming any arguments in case of failure.
• Parser now implements Clone, Send, and Sync. Its Debug output now shows the remaining arguments.

Changes:

• The input iterator is now consumed when you create a Parser, instead of during parsing. This breaks certain clever code that inspects the state of the iterator, but RawArgs::as_slice() may provide an alternative. (If you don't know what this means then you aren't affected.) (#16)
• Calling Parser::values() no longer consumes any arguments if you don't use the iterator.
• RawArgs::peek() now takes &self instead of &mut self.

New:

• Add Parser::raw_args() for collecting raw unparsed arguments. (#12)
• Implement Debug for ValuesIter.

Bug fixes:

• Change "missing argument at end of command" error message. (#11)

While this release is not strictly backward-compatible it should break very few programs.

New:

• Add Parser::values() for options with multiple arguments.
• Add Parser::optional_value() for options with optional arguments.
• Add Parser::from_iter() to construct from an iterator that includes the binary name. (#5)
• Document how to use Parser::value() to collect all remaining arguments.

Changes:

• Support = as a separator for short options (as in -o=value). (#18)
• Sanitize the binary name if it's invalid unicode instead of ignoring it.
• Make Error::UnexpectedValue.option a String instead of an Option<String>.

Bug fixes:

• Include bin_name in Parser's Debug output.

Small documentation tweaks