Shell 模式（Ctrl+X）应使用用户默认 Shell 而非固定 /bin/sh

问题描述

在 zsh（或 fish 等）环境下启动 Kimi Code CLI 后，按 Ctrl+X 进入 Shell 模式，输入的命令实际上是由 /bin/sh 执行的，而不是用户当前的默认 Shell。

复现步骤

1. 确保当前终端为 zsh：echo $SHELL → /bin/zsh
2. 启动 kimi
3. 按 Ctrl+X 切换到 Shell 模式
4. 输入 echo $0 或尝试使用 zsh 别名/函数

实际结果

命令由 /bin/sh 执行，zsh 的别名、函数、插件扩展语法均不可用。

期望结果

Shell 模式应识别并复用用户的默认 Shell（通过 $SHELL 环境变量），或者在 asyncio.create_subprocess_shell() 时通过 executable= 参数显式指定。

相关代码位置

kimi_cli/ui/shell/__init__.py 第 739 行左右：

# TODO: For the sake of simplicity, we now use `create_subprocess_shell`.
proc = await asyncio.create_subprocess_shell(command, env=get_clean_env(), **kwargs)

asyncio.create_subprocess_shell 在 POSIX 上默认使用 /bin/sh。建议通过 executable=os.environ.get("SHELL", "/bin/sh") 传入用户默认 Shell。

另外，kimi_cli/utils/environment.py 中的 Environment.detect() 目前只检测 bash/sh，建议扩展为优先检测 $SHELL，以支持 zsh、fish 等常用 Shell。

使用场景

• 使用 zsh 别名（如 ll、gs 等）加速操作
• 依赖 zsh 函数或特定语法的脚本/命令
• 保持与终端一致的行为，降低上下文切换成本

环境信息

• OS: macOS / Linux
• Shell: zsh
• kimi-cli version: latest

Shell mode (Ctrl+X) should use the user default Shell instead of the fixed /bin/sh

Problem description

After starting Kimi Code CLI in the zsh (or fish, etc.) environment, press Ctrl+X to enter Shell mode. The entered command is actually executed by /bin/sh instead of the user's current default Shell.

Reproduction steps

1. Make sure the current terminal is zsh: echo $SHELL → /bin/zsh
2. Start kimi
3. Press Ctrl+X to switch to Shell mode
4. Type echo $0 or try using zsh alias/function

Actual results

The command is executed by /bin/sh, and zsh's aliases, functions, and plug-in extension syntax are not available.

Expected results

Shell mode should recognize and reuse the user's default shell (via the $SHELL environment variable), or specified explicitly via the executable= parameter when asyncio.create_subprocess_shell().

Relevant code location

kimi_cli/ui/shell/__init__.py around line 739:

# TODO: For the sake of simplicity, we now use `create_subprocess_shell`.
proc = await asyncio.create_subprocess_shell(command, env=get_clean_env(), **kwargs)

asyncio.create_subprocess_shell defaults to /bin/sh on POSIX. It is recommended to pass in the user default Shell through executable=os.environ.get("SHELL", "/bin/sh").

In addition, Environment.detect() in kimi_cli/utils/environment.py currently only detects bash/sh. It is recommended to extend it to detect $SHELL first to support common shells such as zsh and fish.

Usage scenarios

• Use zsh aliases (such as ll, gs, etc.) to speed up operations
• Scripts/commands that rely on zsh functions or specific syntax
• Maintain consistent behavior with the terminal and reduce context switching costs

Environment information

• OS: macOS/Linux
• Shell: zsh
• kimi-cli version: latest