#Emacs terminal code
#Emacs terminal plus

If, when running Emacs in a terminal (e.g., Mac's default Terminal.app), C-x C- does not run comment-line, and you would like that functionality, then you must switch to iTerm2 (Terminal.app does not have the capability) and create a Key Mapping under Profiles.Keys as follow: ^ ^[[59 5u I had a little trouble getting there, so here a detailed explanation in case you are like me, confused. Gilles' answer stated: On OSX, you can configure iTerm2 by selecting an escape sequence for each key combination, one by one. On OSX, you can configure iTerm2 by selecting an escape sequence for each key combination, one by one. If Emacs has no such support, you can add it by creating a subdirectory called term somewhere in your load-path, and creating a Lisp file called term/$TERM.el where $TERM is the value of TERM, defining a function called terminal-init-$TERM.Īs I write, it seems that few terminal emulators other than xterm have adopted these escape sequences. If Emacs already has support for your value of TERM, you can add support by defining a function similar to the one above, to be executed after loading the Lisp file whose name is the value of TERM. If the TERM environment variable isn't set to xterm or a variant such as xterm-256color, Emacs won't activate those sequences. (eval-after-load 'xterm' '(my-eval-after-load-xterm)) (apply 'character-apply-modifiers c (cdr x)))) (define-key xterm-function-map (format (car x) c) (when (and (boundp 'xterm-extra-capabilities) (boundp 'xterm-function-map)) (if (memq 'shift modifiers) (setq c (logior (lsh 1 25) c))) (if (memq 'meta modifiers) (setq c (logior (lsh 1 27) c))) (if (memq 'control modifiers) (setq c (if (or (and (<= c) (<= c ?_)) MODIFIERS must be a list of symbols amongst (meta control shift). (defun character-apply-modifiers (c &rest modifiers)

some of the escape sequences but not all of them. GNU Emacs >=24.4 sets xterm in this mode and define xterm with the resource ?.VT100.modifyOtherKeys: 1

#Emacs terminal code

You can use the following code in your init file to complete the job. As of Emacs 24.4, not all escape sequences are supported. Emacs's detection of escape sequences to encode keys works through the variable local-function-key-map. Since Emacs 24.4, Emacs automatically turns on the modifyOtherKeys feature when it detects that the terminal is xterm version ≥216. If your terminal emulator doesn't support these syntaxes but can be configured, pick either. Current versions of xterm (≥216) can be configured for either syntax by setting the formatOtherKeys resource the feature must be activated by setting the modifyOtherKeys to a nonzero value. Another is Thomas Dickey's xterm with the syntax ESC [ 2 7 modifier codepoint ~. One is LeoNerd's libtermkey with the syntax ESC [ codepoint modifier u. Lately, the situation is changing, because there have been two proposals to standardize on escape sequences. Some terminal emulators can be configured to send arbitrary escape sequences, so if yours can, you can configure it and declare the escape sequences to Emacs (more on this later). There was no standard for escape sequences, which was self-perpetuating - terminal vendors don't implement it, applications don't support it, users don't expect it. Terminal vendors kept doing the simple thing for a long time.

Many terminals ignore modifiers when there's no corresponding character, so you end up with Ctrl+ sending, Ctrl+ Shift+ letter equivalent to Ctrl+ letter, etc. So what about other combinations such as Ctrl+ or Ctrl+ Shift+ letter? Since there's no corresponding character, the terminal has to either reuse a character or send an escape sequence.

Meta+ character is sent as Esc followed by character.

Ctrl+ ? is more convenient for Emacs, since Ctrl+ H is help.

And Backspace = Ctrl+ H or Ctrl+ ? depending on the configuration.

Some function keys are equivalent to control characters: Tab = Ctrl+ I, Return = Ctrl+ M, Esc = Ctrl+ [.Often Ctrl+ ? turns into byte 127 and Ctrl+ Space is equivalent to Ctrl+ (byte 0).

#Emacs terminal plus

Ctrl plus a letter or one of turns into bytes 0–31 (ASCII control characters).

Only a few modifier+character combinations have their own character: In Shift+Up isn't recognized by Emacs in a terminal I explain how terminals translate most function keys into escape sequences, because the interface between applications and terminals transmits characters (or rather bytes), not keys.