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diff --git a/articles/c-d_to_close_eshell.org b/articles/c-d_to_close_eshell.org new file mode 100644 index 0000000..525e462 --- /dev/null +++ b/articles/c-d_to_close_eshell.org @@ -0,0 +1,56 @@ +#+TITLE: C-d to close eshell + +One of the "tricks" that I have learned to use when working with +terminals is using ~C-d~ to close them, or when working on a TTY +logout. It somehow grew to the extent that if I can't use it, I get +annoyed, like with ~eshell~. + +I have customized ~ansi-term~ to immediately close its buffer after the +shell quits. This makes it very easy to start an ~ansi-term~, which I've +bound to ~C-c t~, run a quick command (perhaps ~make~, or similar), ~C-d~, +and I'm out. I want that for my ~eshell~ too. + +There are a few conditions that I want met before the buffer is +killed, though. + +1. Since ~eshell~ is an Emacs mode like any other, ~C-d~ is usually used + to forward-kill characters, I don't want to lose this. +2. I only want it to quit when the line of input is empty. + +The following piece of code make sure these conditions are met. + +1. It interactively calls =delete-char=, which keeps keybindings like + ~C-4 C-d~ to delete 4 characters working. +2. It catches the error condition which is signaled whenever + =delete-char= can't do it's job (like when there's nothing left to + delete in the buffer). +3. It checks to make sure that the signaled error is the =end-of-buffer= + error. I don't want to kill the buffer if I try to delete more + characters than are in the buffer because I feel that could cause + irritating surprises. +4. It checks of the cursor is at the ~eshell~ prompt. This, combined + with only responding to the =end-of-buffer= error, makes sure we're + on an empty line and not just at the end of the input. Sometimes + keys are pressed at the wrong time and I don't want to have to + re-type a command just because I was being an idiot. +5. If the right conditions aren't met, signal the error again so I can + see what's going on. + +#+BEGIN_SRC emacs-lisp + (defun eshell-C-d () + "Either call `delete-char' interactively or quit." + (interactive) + (condition-case err + (call-interactively #'delete-char) + (error (if (and (eq (car err) 'end-of-buffer) + (looking-back eshell-prompt-regexp)) + (kill-buffer) + (signal (car err) (cdr err)))))) +#+END_SRC + +I then bind this to =C-d= in eshell. + +#+BEGIN_SRC emacs-lisp + (add-hook 'eshell-mode-hook + (lambda () (local-set-key (kbd "C-d") #'eshell-C-d))) +#+END_SRC |