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;;; register-quicknav.el --- Quickly jump to next/previous register. -*- lexical-binding: t; -*-
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;; Copyright (C) 2020 tastytea
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;; Author: tastytea <tastytea@tastytea.de>
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;; Keywords: register
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;; Version: 0.1.0
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This package is built on top of register.el and allows you to quickly jump to
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;; the next/previous position register. If you reach the end, the search wraps
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;; around and continues with the first (or last) register.
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;; Features:
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;;
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;; * Cycle through all position registers in both directions.
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;; Known limitations:
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;;
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;; Works only for as long as the buffer containing the registers is open. If
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;; you close and reopen it, it won't work anymore.
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;; Installation:
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;;
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;; To use `register-quicknav.el', put it in your load-path and add the following
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;; to your .emacs
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;;
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;; (require 'register-quicknav)
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;; (global-set-key (kbd "<C-f5>") 'register-quicknav/prev-register)
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;; (global-set-key (kbd "<C-f6>") 'register-quicknav/next-register)
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;;
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;; Or, with use-package:
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;;
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;; (use-package register-quicknav
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;; :commands (register-quicknav/prev-register register-quicknav/next-register)
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;; :bind
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;; ("C-<f5>" . register-quicknav/prev-register)
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;; ("C-<f6>" . register-quicknav/next-register))
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;;; Code:
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(defvar register-quicknav//current-position-register 0
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"An index to the current position register.")
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(defun register-quicknav//sort-position-register-elements (a b)
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"Return t if the file name is the same and A < B."
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(let ((marker-a (cdr a))
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(marker-b (cdr b)))
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(and (string= (buffer-file-name (marker-buffer marker-a))
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(buffer-file-name (marker-buffer marker-b)))
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(< (marker-position marker-a)
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(marker-position marker-b)))))
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(defun register-quicknav//registers ()
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"Return all position registers, sorted by file name and position."
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(let (result)
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(dolist (item register-alist)
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(when (markerp (cdr item))
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(setq result (cons item result))))
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(sort result 'register-quicknav//sort-position-register-elements)))
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(defun register-quicknav/next-register ()
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"Jump to next register."
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(interactive)
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(setq register-quicknav//current-position-register
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(+ register-quicknav//current-position-register 1))
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(when (>= register-quicknav//current-position-register
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(length (register-quicknav//registers)))
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(setq register-quicknav//current-position-register 0))
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(let (register-element register-name)
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(setq register-element
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(car (nthcdr register-quicknav//current-position-register
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(register-quicknav//registers))))
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(setq register-name (car register-element))
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(register-to-point register-name)))
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(defun register-quicknav/prev-register ()
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"Jump to previous register."
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(interactive)
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(setq register-quicknav//current-position-register
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(- register-quicknav//current-position-register 1))
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(when (< register-quicknav//current-position-register 0)
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(setq register-quicknav//current-position-register
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(- (length (register-quicknav//registers)) 1)))
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(let (register-element register-name)
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(setq register-element
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(car (nthcdr register-quicknav//current-position-register
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(register-quicknav//registers))))
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(setq register-name (car register-element))
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(register-to-point register-name)))
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(provide 'register-quicknav)
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;;; register-quicknav.el ends here
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