;;; +scratch.el -*- lexical-binding: t; -*-

;;; Code:

;;(require 'scratch)

(defun +scratch-immortal ()
  "Bury, don't kill \"*scratch*\" buffer.
For `kill-buffer-query-functions'."
  (if (or (eq (current-buffer) (get-buffer "*scratch*"))
          (eq (current-buffer) (get-buffer "*text*")))
      (progn (bury-buffer)
             nil)
    t))

(defun +scratch-buffer-setup ()
    "Add comment to `scratch' buffer and name it accordingly."
    (let* ((mode (format "%s" major-mode))
           (string (concat "Scratch buffer for:" mode "\n\n")))
      (when scratch-buffer
        (save-excursion
          (insert string)
          (goto-char (point-min))
          (comment-region (point-at-bol) (point-at-eol)))
        (next-line 2))
      (rename-buffer (concat "*scratch<" mode ">*") t)))

(defun +scratch-fortune ()
  (let* ((fmt (if (executable-find "fmt")
                  (format "| fmt -%d -s" (- fill-column 2))
                ""))
         (s (string-trim
             (if (executable-find "fortune")
                 (shell-command-to-string (concat "fortune -s" fmt))
               "ABANDON ALL HOPE YE WHO ENTER HERE"))))
    (concat (replace-regexp-in-string "^" ";; " s)
            "\n\n")))

;; [[https://old.reddit.com/r/emacs/comments/ui1q41/weekly_tips_tricks_c_thread/i7ef4xg/][u/bhrgunatha]]
(defun +scratch-text-scratch ()
  "Create a \"*text*\" scratch buffer in Text mode."
  (with-current-buffer (get-buffer-create "*text*")
    (text-mode)))

(defcustom +scratch-buffers '("*text*" "*scratch*")
  "Scratch buffers.")

(defvar +scratch-last-non-scratch-buffer nil
  "Last buffer that wasn't a scratch buffer.")

(defun +scratch-toggle (buffer)
  "Switch to BUFFER, or to the previous (non-scratch) buffer."
  (if (or (null +scratch-last-non-scratch-buffer)
          (not (member (buffer-name (current-buffer)) +scratch-buffers)))
      ;; Switch to a scratch buffer
      (progn
        (setq +scratch-last-non-scratch-buffer (current-buffer))
        (switch-to-buffer buffer))
    ;; Switch away from scratch buffer ...
    (if (equal (get-buffer-create buffer) (current-buffer))
        ;; to the original buffer
        (switch-to-buffer +scratch-last-non-scratch-buffer)
        ;; to another scratch
        (switch-to-buffer buffer))))

(defun +scratch-switch-to-scratch ()
  "Switch to scratch buffer."
  (interactive)
  (+scratch-toggle "*scratch*"))

(defun +scratch-switch-to-text ()
  "Switch to text buffer."
  (interactive)
  (+scratch-toggle "*text*"))

(provide '+scratch)
;;; +scratch.el ends here