#+TITLE: Eshell configuration

#+BEGIN_SRC emacs-lisp
  (require 'eshell)
  (require 'em-prompt)
#+END_SRC

Truncate the eshell buffer when it gets larger than
=eshell-buffer-maximum-lines= number of lines. For some reason I have
to use the =eshell-load-hook= instead of just relying on ~eshell.el~
and ~esh-mode.el~ being loaded because it seems that
=with-eval-after-load= loads this file before ~eshell.el~ is actually
loaded.

#+BEGIN_SRC emacs-lisp
  (defun oni:enable-truncating-eshell-buffers ()
    (add-to-list 'eshell-output-filter-functions 'eshell-truncate-buffer))

  (add-hook 'eshell-load-hook #'oni:enable-truncating-eshell-buffers)
#+END_SRC

Show the status of each command in the fringe of the eshell buffer.

#+BEGIN_SRC emacs-lisp
  (add-hook 'eshell-mode-hook 'eshell-fringe-status-mode)
#+END_SRC

Close the buffer when C-d is pressed and we're at the end of the
buffer.

#+BEGIN_SRC emacs-lisp
  (defun oni:eshell-C-d ()
    "Call `delete-char' or close the buffer if it fails."
    (interactive)
    (condition-case err
        (call-interactively #'delete-char)
      (error (if (and (eq (car err) 'end-of-buffer)
                      (looking-back eshell-prompt-regexp nil))
                 (kill-buffer)
               (signal (car err) (cdr err))))))

  (defun oni:set-eshell-C-d ()
    (define-key eshell-mode-map (kbd "C-d") #'oni:eshell-C-d))

  (add-hook 'eshell-first-time-mode-hook #'oni:set-eshell-C-d)
#+END_SRC