Unlucky Launcher v0.0.1-alpha

Rust 原生单文件 Minecraft 启动器：CLI 完整可用（install/launch/accounts/java/diagnose/agent），
MCP server 接入外部 Agent 工具，GUI 开发中。

crates/app/src/conv/versions.rs

@@ -0,0 +1,81 @@
+//! 版本列表与下载分类映射（下载页）。
+
+use crate::dto::{AncientKind, VersionKind as DtoVersionKind};
+use crate::state::AppState;
+use crate::{UiVersion, VersionKind};
+
+/// 下载页版本行（已按「仅已装」+ 版本号筛选词过滤）。
+pub fn versions(state: &AppState) -> Vec<UiVersion> {
+    let query = state.download_query.trim().to_lowercase();
+    state
+        .versions
+        .iter()
+        .filter(|version| !state.installed_only || version.installed)
+        .filter(|version| query.is_empty() || version.id.to_lowercase().contains(&query))
+        .map(|version| UiVersion {
+            id: version.id.clone().into(),
+            kind: version_kind(version.kind),
+            released: version.released.clone().into(),
+            installed: version.installed,
+            ancient: version.kind.is_ancient(),
+        })
+        .collect()
+}
+
+fn version_kind(kind: DtoVersionKind) -> VersionKind {
+    match kind {
+        DtoVersionKind::Release => VersionKind::Release,
+        DtoVersionKind::Snapshot => VersionKind::Snapshot,
+        DtoVersionKind::Ancient(AncientKind::Classic) => VersionKind::AncientClassic,
+        DtoVersionKind::Ancient(AncientKind::OldAlpha) => VersionKind::AncientAlpha,
+        DtoVersionKind::Ancient(AncientKind::OldBeta) => VersionKind::AncientBeta,
+        DtoVersionKind::Ancient(AncientKind::Unlisted) => VersionKind::AncientUnlisted,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::versions;
+    use crate::dto::{VersionKind, VersionSummary};
+    use crate::state::AppState;
+
+    fn state_with_versions() -> AppState {
+        let mut state = AppState::new();
+        let row = |id: &str, installed: bool| VersionSummary {
+            id: id.to_string(),
+            kind: VersionKind::Release,
+            released: "2026-01-01".to_string(),
+            installed,
+        };
+        state.versions = vec![
+            row("1.21.9", false),
+            row("1.20.4", true),
+            row("1.20.1", true),
+        ];
+        state
+    }
+
+    #[test]
+    fn installed_only_filter_hides_uninstalled_versions() {
+        let mut state = state_with_versions();
+        assert_eq!(versions(&state).len(), 3);
+
+        state.installed_only = true;
+        let filtered = versions(&state);
+        assert_eq!(filtered.len(), 2);
+        assert!(filtered.iter().all(|version| version.installed));
+    }
+
+    #[test]
+    fn query_filters_by_version_id_substring() {
+        let mut state = state_with_versions();
+        state.download_query = "1.20".to_string();
+        let filtered = versions(&state);
+        assert_eq!(filtered.len(), 2);
+
+        state.download_query = "1.21".to_string();
+        state.installed_only = true;
+        // 「仅已装」优先：1.21.9 未安装 → 空列表
+        assert!(versions(&state).is_empty());
+    }
+}