;;----------------------------------------------------------------------------
;; Line numbers
;;----------------------------------------------------------------------------
;; Linum snippets from: https://www.emacswiki.org/emacs/LineNumbers
(require-package 'nlinum)
(require 'linum)
(require 'hl-line)

(defface my-linum-hl
  `((t :inherit linum :background ,(face-background 'hl-line nil t)))
  "Face for the current line number."
  :group 'linum)
(add-hook 'linum-before-numbering-hook 'my-linum-get-format-string)

(defun my-linum-get-format-string ()
  (let* ((width (1+ (length (number-to-string
                             (count-lines (point-min) (point-max))))))
         (format (concat "%" (number-to-string width) "d \u2502")))
    (setq my-linum-format-string format)))

(defvar my-linum-current-line-number 0)

(defun my-linum-format (line-number)
  (propertize (format my-linum-format-string line-number) 'face
              (if (eq line-number my-linum-current-line-number)
                  'my-linum-hl
                'linum)))
(setq linum-format 'my-linum-format)

(defadvice linum-update (around my-linum-update)
  (let ((my-linum-current-line-number (line-number-at-pos)))
    ad-do-it))
(ad-activate 'linum-update)

(defvar *linum-mdown-line* nil)

(defun line-at-click ()
  (save-excursion
    (let ((click-y (cdr (cdr (mouse-position))))
          (line-move-visual-store line-move-visual))
      (setq line-move-visual t)
      (goto-char (window-start))
      (next-line (1- click-y))
      (setq line-move-visual line-move-visual-store)
      ;; If you are using tabbar substitute the next line with
      ;; (line-number-at-pos))))
      (1+ (line-number-at-pos)))))

(defun md-select-linum ()
  (interactive)
  (goto-line (line-at-click))
  (set-mark (point))
  (setq *linum-mdown-line*
        (line-number-at-pos)))

(defun mu-select-linum ()
  (interactive)
  (when *linum-mdown-line*
    (let (mu-line)
      ;; (goto-line (line-at-click))
      (setq mu-line (line-at-click))
      (goto-line (max *linum-mdown-line* mu-line))
      (set-mark (line-end-position))
      (goto-line (min *linum-mdown-line* mu-line))
      (setq *linum-mdown*
            nil))))

(global-set-key (kbd "<left-margin> <down-mouse-1>") 'md-select-linum)
(global-set-key (kbd "<left-margin> <mouse-1>") 'mu-select-linum)
(global-set-key (kbd "<left-margin> <drag-mouse-1>") 'mu-select-linum)

(add-hook 'find-file-hook (lambda () (linum-mode 1)))
(linum-mode)
(setq global-linum-mode t)

(provide 'init-nlinum)