Function diff_snapshots

atomic-agent/src/watcher/fallback.rs:125–163

Diff two snapshots to produce a `TurnChanges`.

(before: &FileSnapshot, after: &FileSnapshot)

/// Diff two snapshots to produce a `TurnChanges`.
fn diff_snapshots(before: &FileSnapshot, after: &FileSnapshot) -> TurnChanges {
    let mut modified = Vec::new();
    let mut added = Vec::new();
    let mut deleted = Vec::new();

    // Find modified and deleted files
    for (path, before_entry) in before {
        match after.get(path) {
            Some(after_entry) => {
                // File exists in both — check if changed
                if before_entry.mtime != after_entry.mtime || before_entry.size != after_entry.size
                {
                    modified.push(path.clone());
                }
            }
            None => {
                // File was in before but not after — deleted
                deleted.push(path.clone());
            }
        }
    }

    // Find added files
    for path in after.keys() {
        if !before.contains_key(path) {
            added.push(path.clone());
        }
    }

    // Sort for deterministic output
    modified.sort();
    added.sort();
    deleted.sort();

    TurnChanges::new()
        .with_modified(modified)
        .with_added(added)
        .with_deleted(deleted)
}

// FallbackWatcher