modcrawl 0.5.0

Detect, inspect, and analyze Minecraft mods and plugins from JAR files
Documentation 
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use zipcrawl::ZipManager;

use super::super::super::dep::types::{DepEntry, DepKind, VersionRange};
use crate::error::Result;

pub fn extract(mng: &mut ZipManager) -> Result<Vec<DepEntry>> {
    let raw = mng.read_to_string("META-INF/mods.toml")?;
    let meta = toml::from_str::<super::metadata::ModsTomlMetadata>(&raw)?;
    let mut deps = Vec::new();

    for deps_vec in meta.dependencies.values() {
        for dep in deps_vec {
            let kind = forge_dep_kind(dep.dep_type.as_deref());
            if kind.is_excluded() {
                continue;
            }
            deps.push(DepEntry {
                name: dep.mod_id.clone(),
                kind,
                version_range: VersionRange::parse(dep.version_range.clone()),
            });
        }
    }

    Ok(deps)
}

fn forge_dep_kind(dep_type: Option<&str>) -> DepKind {
    match dep_type {
        Some("optional") => DepKind::Optional,
        Some("incompatible") => DepKind::Incompatible,
        Some("discouraged") => DepKind::Discouraged,
        _ => DepKind::Required,
    }
}

#[cfg(test)]
#[allow(clippy::unwrap_used, clippy::default_trait_access)]
mod tests {
    use std::io::{Cursor, Write};
    use zip::ZipWriter;

    use super::*;
    use crate::core::dep::types::DepKind;

    fn make_zip_bytes(contents: &[(&str, &str)]) -> Vec<u8> {
        let mut buf = Cursor::new(Vec::new());
        let mut zip = ZipWriter::new(&mut buf);
        for (name, content) in contents {
            zip.start_file::<&str, ()>(name, Default::default())
                .unwrap();
            zip.write_all(content.as_bytes()).unwrap();
        }
        zip.finish().unwrap();
        buf.into_inner()
    }

    #[test]
    fn extract_required_and_optional() {
        let toml = r#"
[[mods]]
modId = "testmod"
version = "1.0.0"

[[dependencies.testmod]]
modId = "minecraft"
type = "required"
versionRange = ">=1.20"
mandatory = true

[[dependencies.testmod]]
modId = "optional-lib"
type = "optional"
versionRange = ">=2.0"
"#;
        let bytes = make_zip_bytes(&[("META-INF/mods.toml", toml)]);
        let mut mng = ZipManager::from_reader(&mut Cursor::new(bytes)).unwrap();
        let deps = extract(&mut mng).unwrap();
        assert_eq!(deps.len(), 2);
        assert!(deps
            .iter()
            .any(|d| d.name == "minecraft" && d.kind == DepKind::Required));
        assert!(deps
            .iter()
            .any(|d| d.name == "optional-lib" && d.kind == DepKind::Optional));
    }

    #[test]
    fn extract_skips_incompatible() {
        let toml = r#"
[[mods]]
modId = "testmod"
version = "1.0.0"

[[dependencies.testmod]]
modId = "bad-mod"
type = "incompatible"
"#;
        let bytes = make_zip_bytes(&[("META-INF/mods.toml", toml)]);
        let mut mng = ZipManager::from_reader(&mut Cursor::new(bytes)).unwrap();
        let deps = extract(&mut mng).unwrap();
        assert!(deps.is_empty());
    }

    #[test]
    fn extract_empty_when_no_deps() {
        let toml = r#"
[[mods]]
modId = "testmod"
version = "1.0.0"
"#;
        let bytes = make_zip_bytes(&[("META-INF/mods.toml", toml)]);
        let mut mng = ZipManager::from_reader(&mut Cursor::new(bytes)).unwrap();
        let deps = extract(&mut mng).unwrap();
        assert!(deps.is_empty());
    }
}