;;; init-eshell.el -*- lexical-binding: t -*-
;; Emacs command shell
(use-package eshell
  :ensure nil ; built-in
  :defines eshell-prompt-function
  :bind (:map eshell-mode-map
              ([remap recenter-top-bottom] . eshell/clear))
  :config
  (with-no-warnings
    (defun eshell/clear ()
      "Clear the eshell buffer."
      (interactive)
      (let ((inhibit-read-only t))
        (erase-buffer)
        (eshell-send-input)))

    (defun eshell/emacs (&rest args)
      "Open a file (ARGS) in Emacs.  Some habits die hard."
      (if (null args)
          ;; If I just ran "emacs", I probably expect to be launching
          ;; Emacs, which is rather silly since I'm already in Emacs.
          ;; So just pretend to do what I ask.
          (bury-buffer)
        ;; We have to expand the file names or else naming a directory in an
        ;; argument causes later arguments to be looked for in that directory,
        ;; not the starting directory
        (mapc #'find-file (mapcar #'expand-file-name (flatten-tree (reverse args))))))
    (defalias 'eshell/e #'eshell/emacs)
    (defalias 'eshell/ec #'eshell/emacs)

    (defun eshell/ebc (&rest args)
      "Compile a file (ARGS) in Emacs. Use `compile' to do background make."
      (if (eshell-interactive-output-p)
          (let ((compilation-process-setup-function
                 (list 'lambda nil
                       (list 'setq 'process-environment
                             (list 'quote (eshell-copy-environment))))))
            (compile (eshell-flatten-and-stringify args))
            (pop-to-buffer compilation-last-buffer))
        (throw 'eshell-replace-command
               (let ((l (eshell-stringify-list (flatten-tree args))))
                 (eshell-parse-command (car l) (cdr l))))))
    (put 'eshell/ebc 'eshell-no-numeric-conversions t)

    (defun eshell-view-file (file)
      "View FILE.  A version of `view-file' which properly rets the eshell prompt."
      (interactive "fView file: ")
      (unless (file-exists-p file) (error "%s does not exist" file))
      (let ((buffer (find-file-noselect file)))
        (if (eq (get (buffer-local-value 'major-mode buffer) 'mode-class)
                'special)
            (progn
              (switch-to-buffer buffer)
              (message "Not using View mode because the major mode is special"))
          (let ((undo-window (list (window-buffer) (window-start)
                                   (+ (window-point)
                                      (length (funcall eshell-prompt-function))))))
            (switch-to-buffer buffer)
            (view-mode-enter (cons (selected-window) (cons nil undo-window))
                             'kill-buffer)))))

    (defun eshell/less (&rest args)
      "Invoke `view-file' on a file (ARGS).

\"less +42 foo\" will go to line 42 in the buffer for foo."
      (while args
        (if (string-match "\\`\\+\\([0-9]+\\)\\'" (car args))
            (let* ((line (string-to-number (match-string 1 (pop args))))
                   (file (pop args)))
              (eshell-view-file file)
              (forward-line line))
          (eshell-view-file (pop args)))))
    (defalias 'eshell/more #'eshell/less))

  (defun ju/eshell-prompt ()
    (let ((current-branch (magit-get-current-branch)))
      (concat
       "\n"
       (propertize (system-name) 'face `(:foreground "#62aeed"))
       (propertize " ॐ " 'face `(:foreground "white"))
       (propertize (ju/get-prompt-path) 'face `(:foreground "#82cfd3"))
       (when current-branch
         (concat
          (propertize " • " 'face `(:foreground "white"))
          (propertize (concat " " current-branch) 'face `(:foreground "#c475f0"))))
       (propertize " • " 'face `(:foreground "white"))
       (propertize (format-time-string "%I:%M:%S %p") 'face `(:foreground "#5a5b7f"))
       (if (= (user-uid) 0)
           (propertize "\n#" 'face `(:foreground "red2"))
         (propertize "\nλ" 'face `(:foreground "#aece4a")))
       (propertize " " 'face `(:foreground "white"))))))

  ;; (setq eshell-prompt-function      'ju/eshell-prompt
  ;;       eshell-prompt-regexp        "^λ "))


;;  Display extra information for prompt
(use-package eshell-prompt-extras
  :straight t
  :ensure t
  :defer t
  :after esh-opt
  :defines eshell-highlight-prompt
  :autoload (epe-theme-lambda epe-theme-dakrone epe-theme-pipeline)
  :init (setq eshell-highlight-prompt t
              eshell-prompt-function #'epe-theme-lambda))

;; `eldoc' support
(use-package esh-help
  :straight t
  :ensure t
  :defer t
  :init (setup-esh-help-eldoc))

;; `cd' to frequent directory in `eshell'
(use-package eshell-z
  :straight t
  :ensure t
  :defer t
  :hook (eshell-mode . (lambda () (require 'eshell-z))))


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