[Init] Initial commit - NetMesh terminal manager

components/terminalLayer/terminalThemePreview.ts

@@ -0,0 +1,42 @@
+export type TerminalThemePreviewState = {
+  targetSessionId: string | null;
+  targetHostId: string | null;
+  globalPreview: boolean;
+  themeId: string | null;
+};
+
+export const emptyTerminalThemePreview = (): TerminalThemePreviewState => ({
+  targetSessionId: null,
+  targetHostId: null,
+  globalPreview: false,
+  themeId: null,
+});
+
+/** Which terminal panes should render a theme preview (sidebar list uses themeId separately). */
+export function resolvePaneThemePreviewId(
+  followAppTerminalTheme: boolean,
+  themePreview: TerminalThemePreviewState,
+  sessionId: string,
+  hostId: string,
+): string | undefined {
+  if (followAppTerminalTheme || !themePreview.themeId) return undefined;
+  if (themePreview.globalPreview) return themePreview.themeId;
+  if (sessionId === themePreview.targetSessionId) return themePreview.themeId;
+  if (themePreview.targetHostId && hostId === themePreview.targetHostId) return themePreview.themeId;
+  return undefined;
+}
+
+export function listThemePreviewSessionIds(
+  sessions: ReadonlyArray<{ id: string }>,
+  sessionHostsMap: Map<string, { id: string }>,
+  themePreview: TerminalThemePreviewState,
+  followAppTerminalTheme: boolean,
+): string[] {
+  if (followAppTerminalTheme || !themePreview.themeId) return [];
+  return sessions.flatMap((session) => {
+    const hostId = sessionHostsMap.get(session.id)?.id ?? '';
+    return resolvePaneThemePreviewId(followAppTerminalTheme, themePreview, session.id, hostId)
+      ? [session.id]
+      : [];
+  });
+}