Triple-C/app/src-tauri/src/file_viewer/mod.rs

//! The terminal file viewer: one OS window per clicked path.
//!
//! Every window is a `file-viewer-<n>` label registered in [`registry::ViewerRegistry`];
//! the commands in `commands/file_viewer_commands.rs` gate on the label and act only on
//! the caller's own entry, which is why nothing here takes a path from a window.

pub mod poll;
pub mod registry;
pub mod resolve;
pub mod window;
pub mod write;

/// Spec §3: the 21st click is refused with a toast.
pub const MAX_VIEWER_WINDOWS: usize = 20;
pub const VIEWER_LABEL_PREFIX: &str = "file-viewer-";

pub fn is_viewer_label(label: &str) -> bool {
    label
        .strip_prefix(VIEWER_LABEL_PREFIX)
        .is_some_and(|rest| !rest.is_empty() && rest.bytes().all(|b| b.is_ascii_digit()))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn only_numbered_viewer_labels_pass() {
        assert!(is_viewer_label("file-viewer-1"));
        assert!(is_viewer_label("file-viewer-20"));
        assert!(!is_viewer_label("file-viewer-"));
        assert!(!is_viewer_label("file-viewer-x"));
        assert!(!is_viewer_label("main"));
        assert!(!is_viewer_label("browser-view-abc"));
    }

    /// Both Vite's dev server and Tauri's asset lookup fall back to `index.html`
    /// when `viewer.html` is missing, so a broken entry opens the *main app* in
    /// the viewer window with no error anywhere. Pin the two files the entry needs.
    #[test]
    fn the_viewer_entry_exists_and_is_a_vite_input() {
        let app_dir = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("..");
        let html = std::fs::read_to_string(app_dir.join("viewer.html")).expect("app/viewer.html");
        assert!(html.contains("/src/viewer/main.tsx"));
        assert!(!html.contains("<style"), "an inline <style> makes Tauri add a style nonce, which disables 'unsafe-inline' and breaks CodeMirror");
        let vite = std::fs::read_to_string(app_dir.join("vite.config.ts")).expect("vite.config.ts");
        assert!(vite.contains("viewer.html"), "vite.config.ts must list viewer.html in build.rollupOptions.input");
        let cap = std::fs::read_to_string(app_dir.join("src-tauri/capabilities/file-viewer.json")).expect("capability");
        assert!(cap.contains("\"file-viewer-*\"") && cap.contains("core:window:allow-destroy"));
    }
}