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Ansi-Term

pasting

There is a function called term-paste, but it is bound to S-insert by default. Who wants that? Use

(require 'term)
(define-key term-raw-map (kbd "C-c y") 'term-paste)
(define-key term-raw-map (kbd "C-c C-y") 'term-paste)

to rebind it to C-c C-y

tmacs

To conveniently open files from terminal even on remote machines, I use tmacswrap

You can define a function to quickly open a tmacs-term with

(defun tmacs--find-free-number ()
  "use this function to create a reasonable buffer name"
  (cl-do ((num 0 (+ 1 num)))
      ((not (get-buffer (format "*tmacs<%s>*" num)))
       num)))

(defun tmacs ()
  (interactive)
  (ansi-term "/bin/bash" (format "tmacs<%s>" (tmacs--find-free-number))))

and then open it with M-x tmacs.

emacsclient

Add to your ~~/.bashrc~:

if [ -n "$INSIDE_EMACS" ]; then
    export VISUAL=emacsclient   # use tmacs here, if you want
    export EDITOR=$VISUAL
fi

Don’t use emacsclient -n because that would confuse programs like git when you edit your commit messages with this.

Forbid TRAMP to ask for password

It may be a problem if one mistypes on a password prompt in tramp, because emacs might lock up your account if there is a limit of unsuccessful logins.

  • tell ssh to not ask for password
  • override tramp function to ask for password and error out.
;; ~/.emacs

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; tramp
(setq tramp-ssh-controlmaster-options "-o PasswordAuthentication=no")

;; don't ever ask for passwords!
;; TODO: implement as advice
(defun tramp-read-passwd (proc &optional prompt)
  (message "Tramp tries to ask for password, inhibiting")
  (error "Tramp tried to ask for password")) ;; just fail

To allow emacs to TRAMP somewhere, nonetheless, use a controlmaster connection

# ~/.ssh/config

# use this, if you have a domain. Else something might not work when using shortnames 
# CanonicalizeHostname yes
# CanonicalDomains my.domain.com

host *
    ControlMaster auto
    ControlPath ~/.ssh/control/%C
    ControlPersist 15m

troubleshooting

slow scrolling (emacs 26.1 has this problem)

In older emacs versions ansi-term was allegedly very slow clearing the screen. In version 26.1 the problem seems to be fixed, but still triggered in a different way: Scrolling fast, if the terminal buffer is already full. I solved this problem by using this[fn:1]

;; Terminal buffer configuration.
(add-hook 'term-mode-hook 'my-term-mode-hook)
(defun my-term-mode-hook ()
  ;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20611
  (setq bidi-paragraph-direction 'left-to-right))

terminal resizing (emacs 26.1 has this problem)

Resizing the terminal in which emacs runs doesn’t inform inferior terminals that they should be resized, too. Use this[fn:2]:

(add-hook 'window-configuration-change-hook (lambda (frame) (window--adjust-process-windows)))

Footnotes

[fn:1] https://www.emacswiki.org/emacs/AnsiTermHints#h5o-8 [fn:2] https://gnu.emacs.bug.narkive.com/nNqAqMND/bug-43126-26-1-ansi-term-not-resized-after-x-window-resize