rfe 0.1.0

Communicate with RF Explorer spectrum analyzers and signal generators over USB serial
Documentation 
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use nom::{
    IResult, Parser,
    bytes::complete::{tag, take},
    character::complete::line_ending,
    combinator::{all_consuming, map_res, opt},
    error::Error,
};
use std::str::{self, FromStr};

pub(crate) fn parse_comma(bytes: &[u8]) -> IResult<&[u8], &[u8]> {
    tag(",")(bytes)
}

pub(crate) fn parse_opt_line_ending(bytes: &[u8]) -> IResult<&[u8], Option<&[u8]>> {
    all_consuming(opt(line_ending)).parse(bytes)
}

pub(crate) fn num_parser<'a, T>(
    digits: u8,
) -> impl Parser<&'a [u8], Output = T, Error = Error<&'a [u8]>>
where
    T: FromStr,
{
    map_res(map_res(take(digits), str::from_utf8), T::from_str)
}

pub(crate) fn freq_parser<'a>(
    digits: u8,
) -> impl Parser<&'a [u8], Output = u64, Error = Error<&'a [u8]>> {
    num_parser(digits)
}