| 1 | ;;; misc.el --- some nonstandard editing and utility commands for Emacs |
| 2 | |
| 3 | ;; Copyright (C) 1989, 2001-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Maintainer: emacs-devel@gnu.org |
| 6 | ;; Keywords: convenience |
| 7 | ;; Package: emacs |
| 8 | |
| 9 | ;; This file is part of GNU Emacs. |
| 10 | |
| 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
| 12 | ;; it under the terms of the GNU General Public License as published by |
| 13 | ;; the Free Software Foundation, either version 3 of the License, or |
| 14 | ;; (at your option) any later version. |
| 15 | |
| 16 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | ;; GNU General Public License for more details. |
| 20 | |
| 21 | ;; You should have received a copy of the GNU General Public License |
| 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
| 23 | |
| 24 | ;;; Commentary: |
| 25 | |
| 26 | ;;; Code: |
| 27 | |
| 28 | (eval-when-compile |
| 29 | (require 'tabulated-list)) |
| 30 | |
| 31 | (defun copy-from-above-command (&optional arg) |
| 32 | "Copy characters from previous nonblank line, starting just above point. |
| 33 | Copy ARG characters, but not past the end of that line. |
| 34 | If no argument given, copy the entire rest of the line. |
| 35 | The characters copied are inserted in the buffer before point." |
| 36 | (interactive "P") |
| 37 | (let ((cc (current-column)) |
| 38 | n |
| 39 | (string "")) |
| 40 | (save-excursion |
| 41 | (beginning-of-line) |
| 42 | (backward-char 1) |
| 43 | (skip-chars-backward "\ \t\n") |
| 44 | (move-to-column cc) |
| 45 | ;; Default is enough to copy the whole rest of the line. |
| 46 | (setq n (if arg (prefix-numeric-value arg) (point-max))) |
| 47 | ;; If current column winds up in middle of a tab, |
| 48 | ;; copy appropriate number of "virtual" space chars. |
| 49 | (if (< cc (current-column)) |
| 50 | (if (= (preceding-char) ?\t) |
| 51 | (progn |
| 52 | (setq string (make-string (min n (- (current-column) cc)) ?\s)) |
| 53 | (setq n (- n (min n (- (current-column) cc))))) |
| 54 | ;; In middle of ctl char => copy that whole char. |
| 55 | (backward-char 1))) |
| 56 | (setq string (concat string |
| 57 | (buffer-substring |
| 58 | (point) |
| 59 | (min (line-end-position) |
| 60 | (+ n (point))))))) |
| 61 | (insert string))) |
| 62 | |
| 63 | ;; Variation of `zap-to-char'. |
| 64 | |
| 65 | (defun zap-up-to-char (arg char) |
| 66 | "Kill up to, but not including ARGth occurrence of CHAR. |
| 67 | Case is ignored if `case-fold-search' is non-nil in the current buffer. |
| 68 | Goes backward if ARG is negative; error if CHAR not found. |
| 69 | Ignores CHAR at point." |
| 70 | (interactive "p\ncZap up to char: ") |
| 71 | (let ((direction (if (>= arg 0) 1 -1))) |
| 72 | (kill-region (point) |
| 73 | (progn |
| 74 | (forward-char direction) |
| 75 | (unwind-protect |
| 76 | (search-forward (char-to-string char) nil nil arg) |
| 77 | (backward-char direction)) |
| 78 | (point))))) |
| 79 | |
| 80 | ;; These were added with an eye to making possible a more CCA-compatible |
| 81 | ;; command set; but that turned out not to be interesting. |
| 82 | |
| 83 | (defun mark-beginning-of-buffer () |
| 84 | "Set mark at the beginning of the buffer." |
| 85 | (interactive) |
| 86 | (push-mark (point-min))) |
| 87 | |
| 88 | (defun mark-end-of-buffer () |
| 89 | "Set mark at the end of the buffer." |
| 90 | (interactive) |
| 91 | (push-mark (point-max))) |
| 92 | |
| 93 | (defun upcase-char (arg) |
| 94 | "Uppercasify ARG chars starting from point. Point doesn't move." |
| 95 | (interactive "p") |
| 96 | (save-excursion |
| 97 | (upcase-region (point) (progn (forward-char arg) (point))))) |
| 98 | |
| 99 | (defun forward-to-word (arg) |
| 100 | "Move forward until encountering the beginning of a word. |
| 101 | With argument, do this that many times." |
| 102 | (interactive "^p") |
| 103 | (or (re-search-forward (if (> arg 0) "\\W\\b" "\\b\\W") nil t arg) |
| 104 | (goto-char (if (> arg 0) (point-max) (point-min))))) |
| 105 | |
| 106 | (defun backward-to-word (arg) |
| 107 | "Move backward until encountering the end of a word. |
| 108 | With argument, do this that many times." |
| 109 | (interactive "^p") |
| 110 | (forward-to-word (- arg))) |
| 111 | |
| 112 | ;;;###autoload |
| 113 | (defun butterfly () |
| 114 | "Use butterflies to flip the desired bit on the drive platter. |
| 115 | Open hands and let the delicate wings flap once. The disturbance |
| 116 | ripples outward, changing the flow of the eddy currents in the |
| 117 | upper atmosphere. These cause momentary pockets of higher-pressure |
| 118 | air to form, which act as lenses that deflect incoming cosmic rays, |
| 119 | focusing them to strike the drive platter and flip the desired bit. |
| 120 | You can type `M-x butterfly C-M-c' to run it. This is a permuted |
| 121 | variation of `C-x M-c M-butterfly' from url `http://xkcd.com/378/'." |
| 122 | (interactive) |
| 123 | (if (yes-or-no-p "Do you really want to unleash the powers of the butterfly? ") |
| 124 | (progn |
| 125 | (switch-to-buffer (get-buffer-create "*butterfly*")) |
| 126 | (erase-buffer) |
| 127 | (sit-for 0) |
| 128 | (animate-string "Amazing physics going on..." |
| 129 | (/ (window-height) 2) (- (/ (window-width) 2) 12)) |
| 130 | (sit-for (* 5 (/ (abs (random)) (float most-positive-fixnum)))) |
| 131 | (message "Successfully flipped one bit!")) |
| 132 | (message "Well, then go to xkcd.com!") |
| 133 | (browse-url "http://xkcd.com/378/"))) |
| 134 | |
| 135 | ;; A command to list dynamically loaded libraries. This useful in |
| 136 | ;; environments where dynamic-library-alist is used, i.e., Windows |
| 137 | |
| 138 | (defvar list-dynamic-libraries--loaded-only-p) |
| 139 | (make-variable-buffer-local 'list-dynamic-libraries--loaded-only-p) |
| 140 | |
| 141 | (defun list-dynamic-libraries--loaded (from) |
| 142 | "Compute the \"Loaded from\" column. |
| 143 | Internal use only." |
| 144 | (if from |
| 145 | (let ((name (car from)) |
| 146 | (path (or (cdr from) "<unknown>"))) |
| 147 | ;; This is a roundabout way to change the tooltip without |
| 148 | ;; having to replace the default printer function |
| 149 | (propertize name |
| 150 | 'display (propertize name |
| 151 | 'help-echo (concat "Loaded from: " path)))) |
| 152 | "")) |
| 153 | |
| 154 | (defun list-dynamic-libraries--refresh () |
| 155 | "Recompute the list of dynamic libraries. |
| 156 | Internal use only." |
| 157 | (setq tabulated-list-format ; recomputed because column widths can change |
| 158 | (let ((max-id-len 0) (max-name-len 0)) |
| 159 | (dolist (lib dynamic-library-alist) |
| 160 | (let ((id-len (length (symbol-name (car lib)))) |
| 161 | (name-len (apply 'max (mapcar 'length (cdr lib))))) |
| 162 | (when (> id-len max-id-len) (setq max-id-len id-len)) |
| 163 | (when (> name-len max-name-len) (setq max-name-len name-len)))) |
| 164 | (vector (list "Library" (1+ max-id-len) t) |
| 165 | (list "Loaded from" (1+ max-name-len) t) |
| 166 | (list "Candidate names" 0 t)))) |
| 167 | (tabulated-list-init-header) |
| 168 | (setq tabulated-list-entries nil) |
| 169 | (dolist (lib dynamic-library-alist) |
| 170 | (let* ((id (car lib)) |
| 171 | (from (get id :loaded-from))) |
| 172 | (when (or from |
| 173 | (not list-dynamic-libraries--loaded-only-p)) |
| 174 | (push (list id (vector (symbol-name id) |
| 175 | (list-dynamic-libraries--loaded from) |
| 176 | (mapconcat 'identity (cdr lib) ", "))) |
| 177 | tabulated-list-entries))))) |
| 178 | |
| 179 | ;;;###autoload |
| 180 | (defun list-dynamic-libraries (&optional loaded-only-p buffer) |
| 181 | "Display a list of all dynamic libraries known to Emacs. |
| 182 | \(These are the libraries listed in `dynamic-library-alist'.) |
| 183 | If optional argument LOADED-ONLY-P (interactively, prefix arg) |
| 184 | is non-nil, only libraries already loaded are listed. |
| 185 | Optional argument BUFFER specifies a buffer to use, instead of |
| 186 | \"*Dynamic Libraries*\". |
| 187 | The return value is always nil." |
| 188 | (interactive "P") |
| 189 | (unless (bufferp buffer) |
| 190 | (setq buffer (get-buffer-create "*Dynamic Libraries*"))) |
| 191 | (with-current-buffer buffer |
| 192 | (tabulated-list-mode) |
| 193 | (setq tabulated-list-sort-key (cons "Library" nil)) |
| 194 | (add-hook 'tabulated-list-revert-hook 'list-dynamic-libraries--refresh nil t) |
| 195 | (setq list-dynamic-libraries--loaded-only-p loaded-only-p) |
| 196 | (list-dynamic-libraries--refresh) |
| 197 | (tabulated-list-print)) |
| 198 | (display-buffer buffer) |
| 199 | nil) |
| 200 | |
| 201 | (provide 'misc) |
| 202 | |
| 203 | ;;; misc.el ends here |