lighty-modsloader 26.5.6

Mods + modpacks resolver (Modrinth / CurseForge) for Lighty Launcher
Documentation 
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// Copyright (c) 2025 Hamadi
// Licensed under the MIT License

//! User-facing types for the mod resolver.

/// A mod the user asked the launcher to install.
///
/// `version` / `file_id` are optional pins — if absent, the resolver picks
/// the latest release compatible with the instance's MC version + loader.
#[derive(Debug, Clone)]
pub enum ModRequest {
    Modrinth {
        id_or_slug: String,
        version: Option<String>,
    },
    CurseForge {
        mod_id: u32,
        file_id: Option<u32>,
    },
}

/// Source tag — used for dedup keys and error messages.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ModSource {
    Modrinth,
    CurseForge,
}

impl ModSource {
    pub fn as_str(self) -> &'static str {
        match self {
            ModSource::Modrinth => "modrinth",
            ModSource::CurseForge => "curseforge",
        }
    }
}

/// Dedup key for the BFS resolver: `(source, project-level identifier)`.
/// Version-agnostic — first occurrence wins (BFS order, user requests
/// before transitively-pulled deps).
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ModKey {
    pub source: ModSource,
    pub id: String,
}

impl ModKey {
    pub fn modrinth(id: impl Into<String>) -> Self {
        Self { source: ModSource::Modrinth, id: id.into() }
    }
    pub fn curseforge(mod_id: u32) -> Self {
        Self { source: ModSource::CurseForge, id: mod_id.to_string() }
    }
}

impl From<&ModRequest> for ModKey {
    fn from(req: &ModRequest) -> Self {
        match req {
            ModRequest::Modrinth { id_or_slug, .. } => ModKey::modrinth(id_or_slug.clone()),
            ModRequest::CurseForge { mod_id, .. } => ModKey::curseforge(*mod_id),
        }
    }
}