;;; oni-eshell.el --- Eshell configuration           -*- lexical-binding: t; -*-

;; Copyright (C) 2019  Tom Willemse

;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: local
;; Version: 2020.1106.164034
;; Package-Requires: (eshell-fringe-status esh-autosuggest xterm-color eshell-syntax-highlighting)

;; 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:

;; Eshell configuration.

;;; Code:

(require 'eshell)

(require 'em-dirs)
(require 'em-prompt)
(require 'esh-autosuggest)
(require 'xterm-color)

(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-eshell--enable-truncating-buffers ()
  "Add `eshell-truncate-buffer' to `eshell-output-filter-functions'."
  (add-to-list 'eshell-output-filter-functions 'eshell-truncate-buffer))

(defun oni-eshell--enable-xterm-filter ()
  "Add ‘xterm-color-filter’ to ‘eshell-preoutput-filter-functions’."
  (add-to-list 'eshell-preoutput-filter-functions 'xterm-color-filter))

(defun oni-eshell--disable-ansi-color-handling ()
  "Remove ‘eshell-handle-ansi-color’ from ‘eshell-output-filter-functions’."
  (setq eshell-output-filter-functions
        (remove 'eshell-handle-ansi-color eshell-output-filter-functions)))

(defun oni-eshell--expand-keymap ()
  "Set `C-d' to quit eshell if used at end of prompt."
  (define-key eshell-mode-map (kbd "C-d") #'oni-eshell--C-d)
  (define-key eshell-mode-map (kbd "C-c b") #'oni-eshell-goto-buffer-directory))

(defun oni-eshell--set-xterm-variables ()
  "Set ‘xterm-color-preserve-properties’ to t."
  (setq xterm-color-preserve-properties t))

(defun oni-eshell-fix-esh-autosuggest-active-keymap ()
  "Set ‘company-posframe-active-map’ to ‘esh-autosuggest-active-map’."
  (setq-local company-posframe-active-map esh-autosuggest-active-map))

(defun oni-eshell-goto-buffer-directory (buffer-name)
  "Change the current directory to the given BUFFER-NAME’s directory."
  (interactive
   (list (read-buffer "Switch to buffer’s directory: "
                      nil t (lambda (buf)
                              (let ((b (if (consp buf)
                                           (cdr buf)
                                         (get-buffer buf))))
                                (buffer-file-name b))))))
  (eshell/cd (file-name-directory (buffer-file-name (get-buffer buffer-name))))
  (eshell-reset))

(add-hook 'eshell-before-prompt-hook #'oni-eshell--set-xterm-variables)
(add-hook 'eshell-first-time-mode-hook #'oni-eshell--expand-keymap)
(add-hook 'eshell-load-hook #'oni-eshell--disable-ansi-color-handling)
(add-hook 'eshell-load-hook #'oni-eshell--enable-truncating-buffers)
(add-hook 'eshell-load-hook #'oni-eshell--enable-xterm-filter)
(add-hook 'eshell-mode-hook 'esh-autosuggest-mode)
(add-hook 'eshell-mode-hook 'eshell-syntax-highlighting-mode)
(add-hook 'eshell-mode-hook 'goto-address-mode)

(add-hook 'esh-autosuggest-mode-hook #'oni-eshell-fix-esh-autosuggest-active-keymap)

(when (display-graphic-p)
  (add-hook 'eshell-mode-hook 'eshell-fringe-status-mode))

(setenv "TERM" "xterm-256color")

(add-to-list 'display-buffer-alist
             '("\\`\\*eshell" display-buffer-in-side-window
               (side . bottom)
               (slot . 0)
               (window-height . 0.33)))

;;;###autoload(with-eval-after-load 'eshell (require 'oni-eshell))

(provide 'oni-eshell)
;;; oni-eshell.el ends here