goup 1.1.0

Like rustup or nvm but for Go. 🚀
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use super::{Version, VersionState};
use anyhow::Result;
use nom::{
    bytes::complete::*, character::complete::char, combinator::map_res, error::ErrorKind, IResult,
};

fn number(s: &str) -> IResult<&str, usize> {
    map_res(take_while(|v: char| v.is_ascii_digit()), |v: &str| {
        v.parse()
    })(s)
}

fn prefix<'a>(p: &'a str, s: &'a str) -> IResult<&'a str, &'a str> {
    tag(p)(s)
}

fn delim(s: &str) -> IResult<&str, char> {
    char('.')(s)
}

fn suffix(s: &str) -> IResult<&str, VersionState> {
    if let Ok((s, _)) = prefix("alpha", s) {
        return number(s).map(|(s, v)| (s, VersionState::Alpha(v)));
    };
    if let Ok((s, _)) = prefix("beta", s) {
        return number(s).map(|(s, v)| (s, VersionState::Beta(v)));
    };
    if let Ok((s, _)) = prefix("rc", s) {
        return number(s).map(|(s, v)| (s, VersionState::ReleaseCandidate(v)));
    };
    Err(nom::Err::Failure(nom::error::Error {
        input: s,
        code: ErrorKind::Fail,
    }))
}

/// Takes a Golang release version formatted string and
/// parses it into a [`Version`].
pub fn parse_version(s: &str) -> Result<Version> {
    let mut version = Version::default();

    let (s, major) = number(s).map_err(|_| anyhow::anyhow!("failed parsing major version"))?;
    version.major = major;

    if s.is_empty() {
        return Ok(version);
    }

    let Ok((s, _)) = delim(s) else {
        let (_, suffix) = suffix(s).map_err(|_| anyhow::anyhow!("failed parsing suffix"))?;
        version.pre = Some(suffix);
        return Ok(version);
    };

    let (s, minor) = number(s).map_err(|_| anyhow::anyhow!("failed parsing minor version"))?;
    version.minor = Some(minor);

    if s.is_empty() {
        return Ok(version);
    }

    let Ok((s, _)) = delim(s) else {
        let (_, suffix) = suffix(s).map_err(|_| anyhow::anyhow!("failed parsing suffix"))?;
        version.pre = Some(suffix);
        return Ok(version);
    };

    let (s, patch) = number(s).map_err(|_| anyhow::anyhow!("failed parsing patch version"))?;
    version.patch = Some(patch);

    if s.is_empty() {
        return Ok(version);
    }

    let (_, suffix) = suffix(s).map_err(|_| anyhow::anyhow!("failed parsing suffix"))?;
    version.pre = Some(suffix);

    Ok(version)
}