fapt 0.1.0

Faux' apt package manager for Debian
Documentation 
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use failure::Error;

use crate::rfc822;
use crate::rfc822::RfcMapExt;

/// A version control system entry, e.g. `git Debian https://salsa.debian.org/foo/bar.git`
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Vcs {
    pub vcs: VcsType,
    pub tag: VcsTag,
    pub description: String,
}

/// The name of the VCS tool/ecosystem used, e.g. `git`, `bzr`, ...
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum VcsType {
    Browser,
    Arch,
    Bzr,
    Cvs,
    Darcs,
    Git,
    Hg,
    Mtn,
    Svn,
}

/// The type of the VCS entry, e.g. `Original`, `Debian`, `Upstream`, ...
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum VcsTag {
    Vcs,
    Orig,
    Debian,
    Upstream,
}

pub fn extract(map: &mut rfc822::Map) -> Result<Vec<Vcs>, Error> {
    let mut found = Vec::with_capacity(4);

    for (vcs_token, vcs) in &[
        ("Arch", VcsType::Arch),
        ("Browser", VcsType::Browser),
        ("Browse", VcsType::Browser),
        ("Bzr", VcsType::Bzr),
        ("Cvs", VcsType::Cvs),
        ("Darcs", VcsType::Darcs),
        ("Git", VcsType::Git),
        ("Hg", VcsType::Hg),
        ("Mtn", VcsType::Mtn),
        ("Svn", VcsType::Svn),
    ] {
        // Simplest form: Vcs-Git
        if let Some(description) = map.remove_value(&format!("Vcs-{}", vcs_token)).one_line()? {
            found.push(Vcs {
                description: description.to_string(),
                vcs: *vcs,
                tag: VcsTag::Vcs,
            });
        }

        for (tag_token, tag) in &[
            ("Orig", VcsTag::Orig),
            ("Original", VcsTag::Orig),
            ("Debian", VcsTag::Debian),
            ("Upstream", VcsTag::Upstream),
        ] {
            // Common form: Debian-Vcs-Git, Orig-Vcs-Browser, Original-Vcs-Bzr, Upstream-Vcs-Bzr
            if let Some(description) = map
                .remove_value(&format!("{}-Vcs-{}", tag_token, vcs_token))
                .one_line()?
            {
                found.push(Vcs {
                    description: description.to_string(),
                    vcs: *vcs,
                    tag: *tag,
                });
            }
            // Vcs-Upstream-Bzr seen in the wild
            else if let Some(description) = map
                .remove_value(&format!("Vcs-{}-{}", tag_token, vcs_token))
                .one_line()?
            {
                found.push(Vcs {
                    description: description.to_string(),
                    vcs: *vcs,
                    tag: *tag,
                });
            }
        }
    }

    Ok(found)
}