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In emacs on iTerm2, resolve you can’t enter symbol key binding such as C-; C-: C-> C-< C-. C-,

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Abstract

Hello eveyone it’s me candle.
This time I will show you how to solve the problem that you can’t use symbol keybind on your iTerm2 emacs.
Basically, emacs on iTerm2 can’t use key binding of control + symbol.
The detail thing is written in this article.

(japanese)
http://memo.sugyan.com/entry/20120224/1330051378

Acouding to the article
Apparently it seems that the range of ASCII that ctrl key can control is decided.

This post referred to the below linked article.
I tried how to setup symbol key binding a few years ago and I was frustrated.
But I solved it by that. it was really helpful.

(japanese)
http://d.akinori.org/2012/01/02/


Precondition

You use emacs
You use iTerm2



Setting policy

First of all, I wrote it in the abstract chapter, iTerm2 can’t use control + symbol key binding directly.
So we use the function of emacs as if we hit the control + symbol.

Since I don’t know about detail thing of emacs, I quoted from the referenced article.

(I translated to English)

Actually Emacs has a gimmick function called “event-apply-*-modifier” which is equivalent to the sticky modifier key.
For example, pressing C-x @ c (event-apply-control-modifier) and pressing RET is equivalent to pressing C-RET.

We use this function.
For example, if you want to realize “C-.” , like this “C-x @ c .”.
If you try to run “C-x @ c.” on your emacs, the same action as “C -.” will be executed.
Of course if that key binding is set.

Next, use the global shortcut key of iTerm2’s function.
When you hit “C-.” in iTerm2, if you make it to send “C-x @ c .” to emacs, you can use the “C-.” key binding in emacs.



Key setting of iTerm2

Start iTerm2 and select “Preferences…” from “iTerm2” of the top menu.
Choose the “Keys”, push the + button

We’ll try to add “C-.”

Type the “control + .” in “keyboard shortcut” field which state is active. After typing it will be displayed as “^.”

Next select “Send Hex Code” from the pull down menu.
Write the below text in the appeared text field.

18 40 63 2e

This Hex code corresponds to these.

18 = C-x
40 = @
63 = c
2e = .

In brief, that is

C-x @ c .

Push the ok button.
The other key bindings are these.

ショートカットキーHex code
C-,18 40 63 2c
C-.18 40 63 2e
C-:18 40 63 3a
C-;18 40 63 3b
C-<18 40 63 3c
C->18 40 63 3e

I want you to be careful.

“C-<" is Control + Shift + <

“C->” is registered with Control + Shift + >

As you can see from the above image, the only difference is the last hex code.
If you want to assign C-( or C-/ etc, please see hex code from the below site.

http://www9.plala.or.jp/sgwr-t/c_sub/ascii.html

iTerm2 setting is finish.

Bind a key in emacs

We will assign C-.
We create a function to display the path of the file and assign it to shortcut.
Open the emacs configuration file.

emacs .emacs.d/init.el

Write this.

(defun show-file-name ()
  "Show the full path file name in the minibuffer."
  (interactive)
  (message (buffer-file-name)))

(global-set-key (kbd "C-.") 'show-file-name)

Save it and reload the file.

M-x eval-buffer

And execute C-.

C-.

The file name will be displayed in the bottom.

This means that “C-.” entered on the keyboard has been converted to “C-x @ c .” with iTerm2 and that keybinding worked well on emacs.

It works good.

Conclusion

You can define more shortcut keys with simple symbol key bindings.

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I work in the venture company as a CTO. I start to write program in University, first I learned java, C++ and PHP. In the company, I'm developing web services by Rails. I do like to automation.

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