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;;; evil-visual-mark-mode.el --- Display evil marks on buffer
;; Copyright (C) 2015 Roman Gonzalez.
;; Author: Roman Gonzalez <romanandreg@gmail.com>
;; Maintainer: Roman Gonzalez <romanandreg@gmail.com>
;; Version: 0.0.3
;; Package-Version: 20190116.1557
;; Package-Commit: ac5997971972a9251f140b5542d82790ca4a43b4
;; Package-Requires: ((evil "1.0.9") (dash "2.10"))
;; Keywords: evil
;; This file is not part of GNU Emacs.
;; 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
;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;; evil-visual-mark-mode displays all the evil marks you have
;; registered on a buffer. The purpose of this extension is to enhance
;; the marks in a buffer, normally when you set a mark on a position
;; is because you figured you are going to come back later, also you
;; would like to track all your important functions without having to
;; follow each marker.
;;; Code:
(require 'evil)
(require 'dash)
(defgroup evil-visual-mark-mode nil
"Display evil marks on buffer."
:prefix "evil-visual-mark-mode"
:group 'evil)
(defcustom evil-visual-mark-exclude-marks '("^" "[" "]")
"Marks which should not be displayed on buffer."
:type '(repeat string)
:group 'evil-visual-mark-mode)
(defvar evil-visual-mark-overlay-alist '()
"List of evil visual mark overlays.")
(defface evil-visual-mark-face
'((t (:foreground "white"
:background "#8b008b"
:underline t)))
"Face for evil visual marks"
:group 'evil-visual-mark)
(defun evil-visual-mark-make-overlay (marker)
"Create an overlay for the given MARKER.
This marker will normally come from the advised evil-set-marker
function."
(make-overlay marker marker))
(defun evil-visual-mark-overlay-put (char overlay)
"Puts marker CHAR in created OVERLAY."
(unless (member (format "%c" char) evil-visual-mark-exclude-marks)
(overlay-put overlay
'before-string
(propertize (format "`%c" char)
'face
'evil-visual-mark-face)))
overlay)
(defun evil-visual-mark-populate-overlay-alist ()
"Populate the `evil-visual-mark-overlay-alist'.
This function is called when enabling the evil-visual-marker-mode."
(evil-visual-mark-cleanup)
(setq evil-visual-mark-overlay-alist
(->> evil-markers-alist
(-filter (lambda (it) (markerp (cdr it))))
(-map
(lambda (it)
(let* ((letter (car it))
(buffer (evil-marker-get-buffer letter))
(marker (cdr it))
(new-item (list nil nil))
(new-overlay (evil-visual-mark-make-overlay marker)))
(setf (car new-item) (cons letter buffer))
(setf (cdr new-item) new-overlay)
new-item))))))
(defun evil-visual-mark-hide ()
"Hide all evil markers.
This function is called on `evil-normal-state-exit-hook.'"
(--each evil-visual-mark-overlay-alist
(overlay-put (cdr it)
'before-string
"")))
(defun evil-visual-mark-show ()
"Show all evil markers.
This function is called on `evil-normal-state-entry-hook'."
(--each evil-visual-mark-overlay-alist
(evil-visual-mark-overlay-put (car (car it)) (cdr it))))
(defun evil-visual-mark-render ()
"Render for the first time the evil mark list.
This function is called on the initialization of
`evil-visual-mark-mode'"
(evil-visual-mark-populate-overlay-alist)
(when (evil-normal-state-p)
(--each evil-visual-mark-overlay-alist
(evil-visual-mark-overlay-put (car (car it))
(cdr it)))))
(defun evil-visual-mark-cleanup ()
"Remove all overlays that were created by this mode.
This function is called when disabling `evil-visual-mark-mode'"
(-each evil-visual-mark-overlay-alist
(lambda (it) (delete-overlay (cdr it))))
(setq evil-visual-mark-overlay-alist '()))
(defun evil-global-marker-char? (char)
(and (>= char ?A) (<= char ?Z)))
(defun evil-marker-get-buffer (char)
(if (evil-global-marker-char? char)
'global
(current-buffer)))
(defun evil-marker-get-item (char)
(let* ((buffer (evil-marker-get-buffer char)))
(assoc (cons char buffer) evil-visual-mark-overlay-alist)))
(defun evil-visual-mark-update-mark (char marker)
"Update overlay value for CHAR.
This function gets called from advising `evil-set-marker', the MARKER is
the result of calling that function."
(when (and marker
(markerp marker))
(let* ((new-overlay (evil-visual-mark-make-overlay marker))
(buffer (evil-marker-get-buffer char))
(old-item (evil-marker-get-item char))
(old-overlay (and old-item (cdr old-item))))
;; update overlay state for given char
(if old-item
(setf (cdr old-item) new-overlay)
(let ((new-item (list nil nil)))
(setf (car new-item) (cons char buffer))
(setf (cdr new-item) new-overlay)
(add-to-list 'evil-visual-mark-overlay-alist
new-item)))
;; delete old overlay from view
(when old-overlay
(delete-overlay old-overlay))
;; add new overlay to view
(evil-visual-mark-overlay-put char new-overlay))))
(defadvice evil-set-marker (around compile)
"Listens when an evil marker is being created/updated.
This updates the overlays that show the evil marks on buffer."
(let ((char (ad-get-arg 0))
(marker ad-do-it))
(evil-visual-mark-update-mark char marker)))
;;;###autoload
(define-minor-mode evil-visual-mark-mode
"Makes evil marks visible and easy to remember."
:global t
(if evil-visual-mark-mode
(progn
(ad-activate 'evil-set-marker)
(add-hook 'evil-normal-state-exit-hook 'evil-visual-mark-hide)
(add-hook 'evil-normal-state-entry-hook 'evil-visual-mark-show)
(evil-visual-mark-render))
(progn
(ad-deactivate 'evil-set-marker)
(remove-hook 'evil-normal-state-exit-hook 'evil-visual-mark-hide)
(remove-hook 'evil-normal-state-entry-hook 'evil-visual-mark-show)
(evil-visual-mark-cleanup))))
(provide 'evil-visual-mark-mode)
;;; evil-visual-mark-mode.el ends here
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