how to bind Ctrl+Enter when using "readline" library?

Question

I am writing a *nix shell, I want support the key-combination of Ctrl-Enter. And the library I use is GNU readline.

I have spent several hours on it, but can't find the way.

I can bind Enter successfully, like:

========= ~/.inputrc ===============

"\C-M": "sdf"

====================================

When I press Enter, I got "sdf" echoed, just as expected.

I can also bind Esc,Enter successfully(note, here is key serial, not combination), like:

========= ~/.inputrc ===============

"\e\C-M": "sdf"

====================================

When I pressed Esc and then pressed Enter, "sdf" was echoed as expected.

However, the following line can not produce a valid Ctrl-Enter combination:

========= ~/.inputrc ===============

"\C\C-M": "sdf"

====================================

And, "\C-\C-M" doesn't work too.

Here are two related questions:

how to bind the 'Enter key'

How to bind Ctrl-Enter in fish?

Can any one help me ?

Answer 1

You don't mention which terminal emulator you use - which matters, because in the end, it is the terminal that decides what your program reads from it when you press CTRL+ENTER

A way to make this work is (assuming you use xterm):

• Make xterm send e.g. CTRL+k when you press CTRL+ENTER, by adding a line in your .Xdefaults:

  XTerm.vt100.translations: #override Ctrl<Key>Return: string("\013")

• Bind this to whatever you want in .inputrc:

  "\C-k": "sdf"

Not very elegant, as this will only work in xterm. But, as far as i can see, the only way to get what you want.