feat(core): optional mdns service (#6192)

Co-authored-by: Github Action <action@github.com>

packages/opencode/src/cli/network.ts

@@ -0,0 +1,42 @@
+import type { Argv, InferredOptionTypes } from "yargs"
+import type { Config } from "../config/config"
+
+const options = {
+  port: {
+    type: "number" as const,
+    describe: "port to listen on",
+    default: 0,
+  },
+  hostname: {
+    type: "string" as const,
+    describe: "hostname to listen on",
+    default: "127.0.0.1",
+  },
+  mdns: {
+    type: "boolean" as const,
+    describe: "enable mDNS service discovery (defaults hostname to 0.0.0.0)",
+    default: false,
+  },
+}
+
+export type NetworkOptions = InferredOptionTypes<typeof options>
+
+export function withNetworkOptions<T>(yargs: Argv<T>) {
+  return yargs.options(options)
+}
+
+export function resolveNetworkOptions(args: NetworkOptions, config?: Config.Info) {
+  const portExplicitlySet = process.argv.includes("--port")
+  const hostnameExplicitlySet = process.argv.includes("--hostname")
+  const mdnsExplicitlySet = process.argv.includes("--mdns")
+
+  const mdns = mdnsExplicitlySet ? args.mdns : (config?.server?.mdns ?? args.mdns)
+  const port = portExplicitlySet ? args.port : (config?.server?.port ?? args.port)
+  const hostname = hostnameExplicitlySet
+    ? args.hostname
+    : mdns && !config?.server?.hostname
+      ? "0.0.0.0"
+      : (config?.server?.hostname ?? args.hostname)
+
+  return { hostname, port, mdns }
+}