feat: support custom model providers

src/agents/models-config.ts

@@ -0,0 +1,64 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+
+import { loadConfig, type ClawdisConfig } from "../config/config.js";
+import { ensureClawdisAgentEnv, resolveClawdisAgentDir } from "./agent-paths.js";
+
+type ModelsConfig = NonNullable<ClawdisConfig["models"]>;
+
+const DEFAULT_MODE: NonNullable<ModelsConfig["mode"]> = "merge";
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return Boolean(value && typeof value === "object" && !Array.isArray(value));
+}
+
+async function readJson(pathname: string): Promise<unknown | null> {
+  try {
+    const raw = await fs.readFile(pathname, "utf8");
+    return JSON.parse(raw) as unknown;
+  } catch {
+    return null;
+  }
+}
+
+export async function ensureClawdisModelsJson(
+  config?: ClawdisConfig,
+): Promise<{ agentDir: string; wrote: boolean }> {
+  const cfg = config ?? loadConfig();
+  const providers = cfg.models?.providers;
+  if (!providers || Object.keys(providers).length === 0) {
+    return { agentDir: resolveClawdisAgentDir(), wrote: false };
+  }
+
+  const mode = cfg.models?.mode ?? DEFAULT_MODE;
+  const agentDir = ensureClawdisAgentEnv();
+  const targetPath = path.join(agentDir, "models.json");
+
+  let mergedProviders = providers;
+  let existingRaw = "";
+  if (mode === "merge") {
+    const existing = await readJson(targetPath);
+    if (isRecord(existing) && isRecord(existing.providers)) {
+      const existingProviders = existing.providers as Record<
+        string,
+        NonNullable<ModelsConfig["providers"]>[string]
+      >;
+      mergedProviders = { ...existingProviders, ...providers };
+    }
+  }
+
+  const next = `${JSON.stringify({ providers: mergedProviders }, null, 2)}\n`;
+  try {
+    existingRaw = await fs.readFile(targetPath, "utf8");
+  } catch {
+    existingRaw = "";
+  }
+
+  if (existingRaw === next) {
+    return { agentDir, wrote: false };
+  }
+
+  await fs.mkdir(agentDir, { recursive: true, mode: 0o700 });
+  await fs.writeFile(targetPath, next, { mode: 0o600 });
+  return { agentDir, wrote: true };
+}