How to insert new lines when editing some script with fish's built-in editor?

Question

When inputing multiline script in fish shell, e.g. I have input these script

$ for file in *.txt
    echo $file
  end

and my caret is after the word end. Now I want to insert a line before it, make it like:

$ for file in *.txt
    echo $file
    echo "hello"   // I want to insert this line
  end

But I found if I move my caret up and after echo $file, and press enter(or cmd/option/ctrl+enter), it just run the entire script without inserting a new line. I have to copy them to another editor and copy back after editing.

Is there any way to do it?

---

Update:

I just uploaded a screen recording https://asciinema.org/a/i7pOWhpdXUu0RLVOAMjVJTXbn. In the recording, I moved my caret up to after echo and pressed option + enter, but it executed the script instead of inserting a new line

Answer 1

在默认绑定中，Alt-Enter 将始终插入新行：

> bind|fgrep \\n
bind \e\n commandline\ -i\ \\n
bind \e\r commandline\ -i\ \\n
...

根据您的系统配置，Enter/Return 键可能会发送换行符 ( \n) 或回车符 ( \r)，因此这就是有两个条目的原因。

Answer 2

fish 绑定转义 + 换行符以无条件插入换行符。在 Mac 上，您通常会按选项 + 返回。但是 Mac 终端模拟器默认不发送转义换行符。使用 iTerm2，您可以在 Preferences->Profiles->Keys 下请求该选项作为转义：

现在绑定将处于活动状态并且 option-return 将无条件地插入换行符。

（如果您愿意，您可以为这种情况添加一个键映射。）

您可以确认终端从fish_key_reader安装在 fish 旁边的模拟器接收到什么。