feat: Implement slash command handling in ACP for /memory,/init,/extensions and /restore

packages/cli/src/zed-integration/acpResume.test.ts

@@ -93,6 +93,7 @@ describe('GeminiAgent Session Resume', () => {
       },
       getApprovalMode: vi.fn().mockReturnValue('default'),
       isPlanEnabled: vi.fn().mockReturnValue(false),
+      getCheckpointingEnabled: vi.fn().mockReturnValue(false),
     } as unknown as Mocked<Config>;
     mockSettings = {
       merged: {

packages/cli/src/zed-integration/commandHandler.test.ts

@@ -0,0 +1,30 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { CommandHandler } from './commandHandler.js';
+import { describe, it, expect } from 'vitest';
+
+describe('CommandHandler', () => {
+  it('parses commands correctly', () => {
+    const handler = new CommandHandler();
+    // @ts-expect-error - testing private method
+    const parse = (query: string) => handler.parseSlashCommand(query);
+
+    const memShow = parse('/memory show');
+    expect(memShow.commandToExecute?.name).toBe('memory show');
+    expect(memShow.args).toBe('');
+
+    const memAdd = parse('/memory add hello world');
+    expect(memAdd.commandToExecute?.name).toBe('memory add');
+    expect(memAdd.args).toBe('hello world');
+
+    const extList = parse('/extensions list');
+    expect(extList.commandToExecute?.name).toBe('extensions list');
+
+    const init = parse('/init');
+    expect(init.commandToExecute?.name).toBe('init');
+  });
+});

packages/cli/src/zed-integration/commandHandler.ts

@@ -0,0 +1,134 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type { Command, CommandContext } from './commands/types.js';
+import { CommandRegistry } from './commands/commandRegistry.js';
+import { MemoryCommand } from './commands/memory.js';
+import { ExtensionsCommand } from './commands/extensions.js';
+import { InitCommand } from './commands/init.js';
+import { RestoreCommand } from './commands/restore.js';
+
+export class CommandHandler {
+  private registry: CommandRegistry;
+
+  constructor() {
+    this.registry = CommandHandler.createRegistry();
+  }
+
+  private static createRegistry(): CommandRegistry {
+    const registry = new CommandRegistry();
+    registry.register(new MemoryCommand());
+    registry.register(new ExtensionsCommand());
+    registry.register(new InitCommand());
+    registry.register(new RestoreCommand());
+    return registry;
+  }
+
+  getAvailableCommands(): Array<{ name: string; description: string }> {
+    return this.registry.getAllCommands().map((cmd) => ({
+      name: cmd.name,
+      description: cmd.description,
+    }));
+  }
+
+  /**
+   * Parses and executes a command string if it matches a registered command.
+   * Returns true if a command was handled, false otherwise.
+   */
+  async handleCommand(
+    commandText: string,
+    context: CommandContext,
+  ): Promise<boolean> {
+    const { commandToExecute, args } = this.parseSlashCommand(commandText);
+
+    if (commandToExecute) {
+      await this.runCommand(commandToExecute, args, context);
+      return true;
+    }
+
+    return false;
+  }
+
+  private async runCommand(
+    commandToExecute: Command,
+    args: string,
+    context: CommandContext,
+  ): Promise<void> {
+    try {
+      const result = await commandToExecute.execute(
+        context,
+        args ? args.split(/\s+/) : [],
+      );
+
+      let messageContent = '';
+      if (typeof result.data === 'string') {
+        messageContent = result.data;
+      } else if (
+        typeof result.data === 'object' &&
+        result.data !== null &&
+        'content' in result.data
+      ) {
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion, @typescript-eslint/no-explicit-any
+        messageContent = (result.data as Record<string, any>)[
+          'content'
+        ] as string;
+      } else {
+        messageContent = JSON.stringify(result.data, null, 2);
+      }
+
+      await context.sendMessage(messageContent);
+    } catch (error) {
+      const errorMessage =
+        error instanceof Error ? error.message : String(error);
+      await context.sendMessage(`Error: ${errorMessage}`);
+    }
+  }
+
+  /**
+   * Parses a raw slash command string into its matching headless command and arguments.
+   * Mirrors `packages/cli/src/utils/commands.ts` logic.
+   */
+  private parseSlashCommand(query: string): {
+    commandToExecute: Command | undefined;
+    args: string;
+  } {
+    const trimmed = query.trim();
+    const parts = trimmed.substring(1).trim().split(/\s+/);
+    const commandPath = parts.filter((p) => p);
+
+    let currentCommands = this.registry.getAllCommands();
+    let commandToExecute: Command | undefined;
+    let pathIndex = 0;
+
+    for (const part of commandPath) {
+      const foundCommand = currentCommands.find((cmd) => {
+        const expectedName = commandPath.slice(0, pathIndex + 1).join(' ');
+        return (
+          cmd.name === part ||
+          cmd.name === expectedName ||
+          cmd.aliases?.includes(part) ||
+          cmd.aliases?.includes(expectedName)
+        );
+      });
+
+      if (foundCommand) {
+        commandToExecute = foundCommand;
+        pathIndex++;
+        if (foundCommand.subCommands) {
+          currentCommands = foundCommand.subCommands;
+        } else {
+          break;
+        }
+      } else {
+        break;
+      }
+    }
+
+    const args = parts.slice(pathIndex).join(' ');
+
+    return { commandToExecute, args };
+  }
+}

packages/cli/src/zed-integration/commands/commandRegistry.ts

@@ -0,0 +1,33 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { debugLogger } from '@google/gemini-cli-core';
+import type { Command } from './types.js';
+
+export class CommandRegistry {
+  private readonly commands = new Map<string, Command>();
+
+  register(command: Command) {
+    if (this.commands.has(command.name)) {
+      debugLogger.warn(`Command ${command.name} already registered. Skipping.`);
+      return;
+    }
+
+    this.commands.set(command.name, command);
+
+    for (const subCommand of command.subCommands ?? []) {
+      this.register(subCommand);
+    }
+  }
+
+  get(commandName: string): Command | undefined {
+    return this.commands.get(commandName);
+  }
+
+  getAllCommands(): Command[] {
+    return [...this.commands.values()];
+  }
+}