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;;; multi-eshell.el --- multi-eshell -*- lexical-binding: t; -*-
;; Copyright (C) 2023 Thanos Apollo
;; Author: Thanos Apollo <[email protected]>
;; Keywords:
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(defun if-void (arg default)
(if (boundp arg)
(eval arg)
default
))
(defgroup multi-eshell nil
"Simple support for having multiple shells open."
:group 'languages)
(defcustom multi-eshell-shell-function '(eshell)
"Command called to create shell"
:group 'multi-eshell)
(defcustom multi-eshell-name "*eshell*" "The name of the buffer opened by the shell command."
:type 'string
:group 'multi-eshell)
(defun multi-eshell-function ()
"This function opens the appropriate shell."
(eval multi-eshell-shell-function))
(defvar multi-eshell-ring (make-ring 100)
"This stores a bunch of buffers, which are shells created by multi-eshell." )
(setq multi-eshell-index 0 )
(defvar multi-eshell-last-buffer nil)
(defun multi-eshell-is-current-buffer-current-multi-eshell (&optional ignored)
"Checks if current buffer is the current multi-eshell."
(eq (current-buffer) (ring-ref multi-eshell-ring multi-eshell-index)))
(defun multi-eshell-switch-to-current-shell (&optional ignored)
"Switch to shell buffer."
(if (buffer-live-p (ring-ref multi-eshell-ring multi-eshell-index))
(switch-to-buffer (ring-ref multi-eshell-ring multi-eshell-index))))
(defun multi-eshell-current-shell (&optional ignored)
"Returns the current multi-eshell."
(ring-ref multi-eshell-ring multi-eshell-index))
(defun multi-eshell-switch-to-next-live-shell (&optional ignored)
"Switches to the next live shell. Creates one if none exists."
(interactive "p")
(let ((still-looking t)
(empty nil))
(while (and still-looking (not empty))
(if (ring-empty-p multi-eshell-ring)
(progn
(setq empty t)
(multi-eshell 1))
(progn
(if (buffer-live-p (ring-ref multi-eshell-ring multi-eshell-index))
(progn
(setq multi-eshell-index (+ multi-eshell-index 1))
(switch-to-buffer (ring-ref multi-eshell-ring multi-eshell-index))
(setq still-looking nil))
(ring-remove multi-eshell-ring multi-eshell-index)))))))
;;;###autoload
(defun multi-eshell-go-back (&optional ignored)
"Switch to buffer multi-eshell-last-buffer."
(interactive "p")
(if (buffer-live-p multi-eshell-last-buffer)
(switch-to-buffer multi-eshell-last-buffer)
(message "Last buffer visited before multi-eshell is gone. Nothing to go back to..")))
;;;###autoload
(defun multi-eshell-switch (&optional ignored)
"If current buffer is not an multi-eshell, switch to current multi-eshell buffer. Otherwise, switch to next multi-eshell buffer."
(interactive "p")
(progn
(setq multi-eshell-last-buffer (current-buffer))
(let ((still-looking t)
(empty nil))
(if (ring-empty-p multi-eshell-ring)
(multi-eshell 1)
(if (and (buffer-live-p (multi-eshell-current-shell) )
(not (eq (multi-eshell-current-shell) (current-buffer))))
(switch-to-buffer (multi-eshell-current-shell))
(multi-eshell-switch-to-next-live-shell))))))
;;;###autoload
(defun multi-eshell (&optional numshells)
"Creates a shell buffer. If one already exists, this creates a new buffer, with the name '*shell*<n>', where n is chosen by the function generate-new-buffer-name."
(interactive "p")
(progn
(setq multi-eshell-last-buffer (current-buffer))
(dotimes (i (if-void 'numshells 1) nil)
(let ( (tempname (generate-new-buffer-name "*tempshell*"))
(new-buff-name (generate-new-buffer-name multi-eshell-name))
(localdir default-directory))
(if (eq (get-buffer multi-eshell-name) nil)
(progn
(multi-eshell-function)
(ring-insert multi-eshell-ring (current-buffer))
(setq multi-eshell-index (+ multi-eshell-index 1)))
(progn
(interactive)
(multi-eshell-function)
(rename-buffer tempname)
(multi-eshell-function)
(rename-buffer new-buff-name )
(switch-to-buffer tempname)
(rename-buffer multi-eshell-name)
(switch-to-buffer new-buff-name)
(ring-insert multi-eshell-ring (current-buffer) )
(setq multi-eshell-index (+ multi-eshell-index 1))))))))
(defun shell-with-name (name)
"Creates a shell with name given by the first argument, and switches to it. If a buffer with name already exists, we simply switch to it."
(let ((buffer-of-name (get-buffer name))
(tempname (generate-new-buffer-name "*tempshell*") ) )
(cond ((bufferp buffer-of-name) ;If the buffer exists, switch to it (assume it is a shell)
(switch-to-buffer name))
((bufferp (get-buffer multi-eshell-name))
(progn
(multi-eshell-function)
(rename-buffer tempname)
(multi-eshell-function)
(rename-buffer name)
(switch-to-buffer tempname)
(rename-buffer multi-eshell-name)
(switch-to-buffer name)))
(t
(progn
(multi-eshell-function)
(rename-buffer name))))))
(provide 'multi-eshell)
;;; multi-eshell.el ends here
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