[Init] Initial commit - NetMesh terminal manager

components/terminalLayer/terminalFontSizeUpdate.ts

@@ -0,0 +1,30 @@
+import { isSavedVaultHost } from "../../domain/ephemeralHosts";
+import type { Host, TerminalSession } from "../../types";
+
+export type TerminalFontSizeUpdateTarget =
+  | { kind: "none" }
+  | { kind: "global" }
+  | { kind: "session" }
+  | { kind: "host"; host: Host };
+
+export function resolveTerminalFontSizeUpdateTarget({
+  session,
+  sessionHost,
+  rawHost,
+}: {
+  session?: TerminalSession;
+  sessionHost?: Host | null;
+  rawHost?: Host | null;
+}): TerminalFontSizeUpdateTarget {
+  if (session?.workspaceId || session?.ephemeralHost) return { kind: "session" };
+  if (!sessionHost) return { kind: "none" };
+
+  const usesGlobalFontSize =
+    sessionHost.protocol === "local"
+    || sessionHost.id?.startsWith("local-")
+    || !rawHost;
+  if (usesGlobalFontSize) return { kind: "global" };
+
+  if (!isSavedVaultHost(rawHost)) return { kind: "session" };
+  return { kind: "host", host: rawHost };
+}