feat(adapters): add Gemini CLI local adapter support

Signed-off-by: Aditya Sasidhar <telikicherlaadityasasidhar@gmail.com>

packages/adapters/gemini-local/src/cli/format-event.ts

@@ -0,0 +1,208 @@
+import pc from "picocolors";
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  if (typeof value !== "object" || value === null || Array.isArray(value)) return null;
+  return value as Record<string, unknown>;
+}
+
+function asString(value: unknown, fallback = ""): string {
+  return typeof value === "string" ? value : fallback;
+}
+
+function asNumber(value: unknown, fallback = 0): number {
+  return typeof value === "number" && Number.isFinite(value) ? value : fallback;
+}
+
+function stringifyUnknown(value: unknown): string {
+  if (typeof value === "string") return value;
+  if (value === null || value === undefined) return "";
+  try {
+    return JSON.stringify(value, null, 2);
+  } catch {
+    return String(value);
+  }
+}
+
+function errorText(value: unknown): string {
+  if (typeof value === "string") return value;
+  const rec = asRecord(value);
+  if (!rec) return "";
+  const msg =
+    (typeof rec.message === "string" && rec.message) ||
+    (typeof rec.error === "string" && rec.error) ||
+    (typeof rec.code === "string" && rec.code) ||
+    "";
+  if (msg) return msg;
+  try {
+    return JSON.stringify(rec);
+  } catch {
+    return "";
+  }
+}
+
+function printTextMessage(prefix: string, colorize: (text: string) => string, messageRaw: unknown): void {
+  if (typeof messageRaw === "string") {
+    const text = messageRaw.trim();
+    if (text) console.log(colorize(`${prefix}: ${text}`));
+    return;
+  }
+
+  const message = asRecord(messageRaw);
+  if (!message) return;
+
+  const directText = asString(message.text).trim();
+  if (directText) console.log(colorize(`${prefix}: ${directText}`));
+
+  const content = Array.isArray(message.content) ? message.content : [];
+  for (const partRaw of content) {
+    const part = asRecord(partRaw);
+    if (!part) continue;
+    const type = asString(part.type).trim();
+
+    if (type === "output_text" || type === "text" || type === "content") {
+      const text = asString(part.text).trim() || asString(part.content).trim();
+      if (text) console.log(colorize(`${prefix}: ${text}`));
+      continue;
+    }
+
+    if (type === "thinking") {
+      const text = asString(part.text).trim();
+      if (text) console.log(pc.gray(`thinking: ${text}`));
+      continue;
+    }
+
+    if (type === "tool_call") {
+      const name = asString(part.name, asString(part.tool, "tool"));
+      console.log(pc.yellow(`tool_call: ${name}`));
+      const input = part.input ?? part.arguments ?? part.args;
+      if (input !== undefined) console.log(pc.gray(stringifyUnknown(input)));
+      continue;
+    }
+
+    if (type === "tool_result" || type === "tool_response") {
+      const isError = part.is_error === true || asString(part.status).toLowerCase() === "error";
+      const contentText =
+        asString(part.output) ||
+        asString(part.text) ||
+        asString(part.result) ||
+        stringifyUnknown(part.output ?? part.result ?? part.text ?? part.response);
+      console.log((isError ? pc.red : pc.cyan)(`tool_result${isError ? " (error)" : ""}`));
+      if (contentText) console.log((isError ? pc.red : pc.gray)(contentText));
+    }
+  }
+}
+
+function printUsage(parsed: Record<string, unknown>) {
+  const usage = asRecord(parsed.usage) ?? asRecord(parsed.usageMetadata);
+  const usageMetadata = asRecord(usage?.usageMetadata);
+  const source = usageMetadata ?? usage ?? {};
+  const input = asNumber(source.input_tokens, asNumber(source.inputTokens, asNumber(source.promptTokenCount)));
+  const output = asNumber(source.output_tokens, asNumber(source.outputTokens, asNumber(source.candidatesTokenCount)));
+  const cached = asNumber(
+    source.cached_input_tokens,
+    asNumber(source.cachedInputTokens, asNumber(source.cachedContentTokenCount)),
+  );
+  const cost = asNumber(parsed.total_cost_usd, asNumber(parsed.cost_usd, asNumber(parsed.cost)));
+  console.log(pc.blue(`tokens: in=${input} out=${output} cached=${cached} cost=$${cost.toFixed(6)}`));
+}
+
+export function printGeminiStreamEvent(raw: string, _debug: boolean): void {
+  const line = raw.trim();
+  if (!line) return;
+
+  let parsed: Record<string, unknown> | null = null;
+  try {
+    parsed = JSON.parse(line) as Record<string, unknown>;
+  } catch {
+    console.log(line);
+    return;
+  }
+
+  const type = asString(parsed.type);
+
+  if (type === "system") {
+    const subtype = asString(parsed.subtype);
+    if (subtype === "init") {
+      const sessionId =
+        asString(parsed.session_id) ||
+        asString(parsed.sessionId) ||
+        asString(parsed.sessionID) ||
+        asString(parsed.checkpoint_id);
+      const model = asString(parsed.model);
+      const details = [sessionId ? `session: ${sessionId}` : "", model ? `model: ${model}` : ""]
+        .filter(Boolean)
+        .join(", ");
+      console.log(pc.blue(`Gemini init${details ? ` (${details})` : ""}`));
+      return;
+    }
+    if (subtype === "error") {
+      const text = errorText(parsed.error ?? parsed.message ?? parsed.detail);
+      if (text) console.log(pc.red(`error: ${text}`));
+      return;
+    }
+    console.log(pc.blue(`system: ${subtype || "event"}`));
+    return;
+  }
+
+  if (type === "assistant") {
+    printTextMessage("assistant", pc.green, parsed.message);
+    return;
+  }
+
+  if (type === "user") {
+    printTextMessage("user", pc.gray, parsed.message);
+    return;
+  }
+
+  if (type === "thinking") {
+    const text = asString(parsed.text).trim() || asString(asRecord(parsed.delta)?.text).trim();
+    if (text) console.log(pc.gray(`thinking: ${text}`));
+    return;
+  }
+
+  if (type === "tool_call") {
+    const subtype = asString(parsed.subtype).trim().toLowerCase();
+    const toolCall = asRecord(parsed.tool_call ?? parsed.toolCall);
+    const [toolName] = toolCall ? Object.keys(toolCall) : [];
+    if (!toolCall || !toolName) {
+      console.log(pc.yellow(`tool_call${subtype ? `: ${subtype}` : ""}`));
+      return;
+    }
+    const payload = asRecord(toolCall[toolName]) ?? {};
+    if (subtype === "started" || subtype === "start") {
+      console.log(pc.yellow(`tool_call: ${toolName}`));
+      console.log(pc.gray(stringifyUnknown(payload.args ?? payload.input ?? payload.arguments ?? payload)));
+      return;
+    }
+    if (subtype === "completed" || subtype === "complete" || subtype === "finished") {
+      const isError =
+        parsed.is_error === true ||
+        payload.is_error === true ||
+        payload.error !== undefined ||
+        asString(payload.status).toLowerCase() === "error";
+      console.log((isError ? pc.red : pc.cyan)(`tool_result${isError ? " (error)" : ""}`));
+      console.log((isError ? pc.red : pc.gray)(stringifyUnknown(payload.result ?? payload.output ?? payload.error)));
+      return;
+    }
+    console.log(pc.yellow(`tool_call: ${toolName}${subtype ? ` (${subtype})` : ""}`));
+    return;
+  }
+
+  if (type === "result") {
+    printUsage(parsed);
+    const subtype = asString(parsed.subtype, "result");
+    const isError = parsed.is_error === true;
+    if (subtype || isError) {
+      console.log((isError ? pc.red : pc.blue)(`result: subtype=${subtype} is_error=${isError ? "true" : "false"}`));
+    }
+    return;
+  }
+
+  if (type === "error") {
+    const text = errorText(parsed.error ?? parsed.message ?? parsed.detail);
+    if (text) console.log(pc.red(`error: ${text}`));
+    return;
+  }
+
+  console.log(line);
+}

packages/adapters/gemini-local/src/cli/index.ts

@@ -0,0 +1 @@
+export { printGeminiStreamEvent } from "./format-event.js";