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;;; highlight-uses-mode.el --- Mode for highlighting uses -*- lexical-binding: t -*-
;; Copyright (c) 2014 Chris Done. All rights reserved.
;; This file 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, or (at your option)
;; any later version.
;; This file 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/>.
;;; Code:
(require 'cl-lib)
(defvar highlight-uses-mode-map
(let ((map (make-sparse-keymap)))
(define-key map (kbd "TAB") 'highlight-uses-mode-next)
(define-key map (kbd "S-TAB") 'highlight-uses-mode-prev)
(define-key map (kbd "<backtab>") 'highlight-uses-mode-prev)
(define-key map (kbd "RET") 'highlight-uses-mode-stop-here)
(define-key map (kbd "C-g") 'highlight-uses-mode)
map)
"Keymap for using `highlight-uses-mode'.")
(defvar-local highlight-uses-mode-point nil)
;;;###autoload
(define-minor-mode highlight-uses-mode
"Minor mode for highlighting and jumping between uses."
:lighter " Uses"
:keymap highlight-uses-mode-map
(if highlight-uses-mode
(setq highlight-uses-mode-point (point))
(when highlight-uses-mode-point
(goto-char highlight-uses-mode-point)))
(remove-overlays (point-min) (point-max) 'highlight-uses-mode-highlight t))
(defun highlight-uses-mode-replace ()
"Replace all highlighted instances in the buffer with something
else."
(interactive)
(save-excursion
(goto-char (point-min))
(let ((o (highlight-uses-mode-next)))
(when o
(let ((replacement (read-from-minibuffer (format "Replace uses %s with: "
(buffer-substring
(overlay-start o)
(overlay-end o))))))
(while o
(goto-char (overlay-start o))
(delete-region (overlay-start o)
(overlay-end o))
(insert replacement)
(setq o (highlight-uses-mode-next))))))))
(defun highlight-uses-mode-stop-here ()
"Stop at this point."
(interactive)
(setq highlight-uses-mode-point (point))
(highlight-uses-mode -1))
(defun highlight-uses-mode-next ()
"Jump to next result."
(interactive)
(let ((os (sort (cl-remove-if (lambda (o)
(or (<= (overlay-start o) (point))
(not (overlay-get o 'highlight-uses-mode-highlight))))
(overlays-in (point) (point-max)))
(lambda (a b)
(< (overlay-start a)
(overlay-start b))))))
(when os
(goto-char (overlay-start (car os)))
(car os))))
(defun highlight-uses-mode-prev ()
"Jump to previous result."
(interactive)
(let ((os (sort (cl-remove-if (lambda (o)
(or (>= (overlay-end o) (point))
(not (overlay-get o 'highlight-uses-mode-highlight))))
(overlays-in (point-min) (point)))
(lambda (a b)
(> (overlay-start a)
(overlay-start b))))))
(when os
(goto-char (overlay-start (car os)))
(car os))))
(defun highlight-uses-mode-highlight (start end)
"Make a highlight overlay at the given span."
(let ((o (make-overlay start end)))
(overlay-put o 'priority 999)
(overlay-put o 'face 'isearch)
(overlay-put o 'highlight-uses-mode-highlight t)))
(provide 'highlight-uses-mode)