├── focus-demo.gif ├── README.org ├── focus.el └── LICENSE /focus-demo.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/larstvei/Focus/HEAD/focus-demo.gif -------------------------------------------------------------------------------- /README.org: -------------------------------------------------------------------------------- 1 | [[https://melpa.org/#/focus][file:https://melpa.org/packages/focus-badge.svg]] 2 | [[https://stable.melpa.org/#/focus][file:https://stable.melpa.org/packages/focus-badge.svg]] 3 | 4 | * Focus 5 | 6 | [[./focus-demo.gif]] 7 | 8 | This is Focus, a package that dims surrounding text. It works with any theme 9 | and can be configured to focus in on different regions like sentences, 10 | paragraphs or code-blocks. 11 | 12 | * Installation 13 | 14 | It's available on [[https://melpa.org/#/focus][MELPA]] and [[https://stable.melpa.org/#/focus][MELPA Stable]]: 15 | 16 | #+BEGIN_EXAMPLE 17 | M-x package-install focus 18 | #+END_EXAMPLE 19 | 20 | * Usage 21 | 22 | Enable ~focus-mode~ with ~M-x focus-mode~. 23 | 24 | A few interactive functions are provided: 25 | 26 | | Function | Description | 27 | |----------------------+--------------------------------------------------------------------------| 28 | | ~focus-change-thing~ | Adjust the narrowness of the focused section for the current buffer | 29 | | ~focus-pin~ | Pin the focused section to its current location or the region, if active | 30 | | ~focus-unpin~ | Unpin the focused section | 31 | | ~focus-next-thing~ | Move the point to the middle of the Nth next thing | 32 | | ~focus-prev-thing~ | Move the point to the middle of the Nth previous thing | 33 | 34 | Focus relies on [[https://www.emacswiki.org/emacs/ThingAtPoint][Thing At Point]], which can retrieve a /thing/ surrounding the 35 | point. These /things/ may be a symbol, list, S-expression (sexp), function 36 | definition (defun), sentence, line, page and others. Calling ~M-x 37 | focus-change-thing~ allows you to interactively change the kind of region 38 | which should be in focus. 39 | 40 | ** Focus read-only mode 41 | 42 | Enable ~focus-read-only-mode~ with ~M-x focus-read-only-mode~. It inhibits 43 | changes in a buffer, hides the cursor and provides bindings for moving 44 | between /things/. 45 | 46 | Some bindings for simple navigation and exiting `focus-read-only-mode` are 47 | provided. 48 | 49 | | Keybinding | Description | 50 | |------------+-----------------------------| 51 | | ~n~ | Jump to next /thing/ | 52 | | ~SPC~ | Jump to next /thing/ | 53 | | ~p~ | Jump to previous /thing/ | 54 | | ~S-SPC~ | Jump to previous /thing/ | 55 | | ~i~ | Exit ~focus-read-only-mode~ | 56 | | ~q~ | Exit ~focus-read-only-mode~ | 57 | 58 | * Customization 59 | 60 | The choice of what /thing/ is suitable for a mode may be configured by 61 | setting the variable ~focus-mode-to-thing~. The default is 62 | 63 | #+BEGIN_EXAMPLE 64 | '((prog-mode . defun) (text-mode . sentence)) 65 | #+END_EXAMPLE 66 | 67 | For modes inheriting ~prog-mode~ (which are most programming modes), the 68 | default is the function-body, and for modes inheriting ~text-mode~, the 69 | default is a sentence. 70 | 71 | For instance, adding the following to your ~.emacs~-file: 72 | 73 | #+BEGIN_SRC emacs-lisp 74 | (add-to-list 'focus-mode-to-thing '(python-mode . paragraph)) 75 | #+END_SRC 76 | 77 | changes ~python-mode~ to focus in on code-blocks with no blank lines rather 78 | than the entire function. 79 | 80 | According to [[https://www.reddit.com/r/emacs/comments/b1vrar/lsp_support_for_focusel_using_lspmode/][this reddit post]], Focus plays nice with ~lsp-mode~. 81 | 82 | ** Faces 83 | 84 | Focus offers two faces, one for the focused- and unfocused area. By default, 85 | the ~focus-focused~ is the empty face, meaning there is no change, and 86 | ~focus-unfocused~ inherits the comment face (which is usually subtle). The 87 | faces can easily be customized via ~M-x list-faces-display~. 88 | -------------------------------------------------------------------------------- /focus.el: -------------------------------------------------------------------------------- 1 | ;;; focus.el --- Dim the font color of text in surrounding sections -*- lexical-binding: t; -*- 2 | 3 | ;; Copyright (C) 2015 Lars Tveito 4 | 5 | ;; Author: Lars Tveito 6 | ;; URL: http://github.com/larstvei/Focus 7 | ;; Created: 11th May 2015 8 | ;; Version: 1.0.1 9 | ;; Package-Requires: ((emacs "24.3") (cl-lib "0.5")) 10 | 11 | ;; This program 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 | ;; This program 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 this program. If not, see . 23 | 24 | ;;; Commentary: 25 | 26 | ;; Focus provides `focus-mode` that dims the text of surrounding sections, 27 | ;; similar to [iA Writer's](https://ia.net/writer) Focus Mode. 28 | ;; 29 | ;; Enable the mode with `M-x focus-mode'. 30 | 31 | ;;; Code: 32 | 33 | (require 'cl-lib) 34 | (require 'thingatpt) 35 | 36 | (declare-function org-element-property "org-element" (property element)) 37 | (declare-function org-element-at-point "org-element" (&optional pom cached-only)) 38 | 39 | (defgroup focus () 40 | "Dim the font color of text in surrounding sections." 41 | :group 'font-lock 42 | :prefix "focus-") 43 | 44 | (defcustom focus-mode-to-thing '((prog-mode . defun) 45 | (text-mode . paragraph) 46 | (org-mode . org-element)) 47 | "An associated list between mode and thing. 48 | 49 | A thing is defined in thingatpt.el; the thing determines the 50 | narrowness of the focused section. 51 | 52 | Note that the order of the list matters. The first mode that the 53 | current mode is derived from is used, so more modes that have 54 | many derivatives should be placed by the end of the list. 55 | 56 | Things that are defined include `symbol', `list', `sexp', 57 | `defun', `filename', `url', `email', `word', `sentence', 58 | `whitespace', `line', and `page'. 59 | 60 | In order for changes to take effect, reenable `focus-mode'." 61 | :type '(alist :key-type symbol :valye-type symbol) 62 | :group 'focus) 63 | 64 | (defcustom focus-read-only-blink-seconds 1 65 | "The duration of a cursor blink in `focus-read-only-mode'." 66 | :type 'number 67 | :group 'focus) 68 | 69 | (defcustom focus-update-idle-delay nil 70 | "Delay (in seconds) before updating the focus after each command. 71 | The default value of nil results in an immediate update. 72 | Increase this value if you experience performance issues." 73 | :type '(choice (const :tag "Immediate update" nil) 74 | (const :tag "Delayed update (0.1s)" 0.1) 75 | (number :tag "Custom delay")) 76 | :group 'focus) 77 | 78 | (defface focus-unfocused 79 | '((t :inherit shadow)) 80 | "The face that overlays the unfocused area." 81 | :group 'focus) 82 | 83 | (defface focus-focused nil 84 | "The face that overlays the focused area." 85 | :group 'focus) 86 | 87 | (defvar focus-cursor-type cursor-type 88 | "Used to restore the users `cursor-type'.") 89 | 90 | (defvar-local focus-current-thing nil 91 | "Overrides the choice of thing dictated by `focus-mode-to-thing' if set.") 92 | 93 | (defvar-local focus-current-thing-cache nil 94 | "Caches the current thing to focus.") 95 | 96 | (defvar-local focus-buffer nil 97 | "Local reference to the buffer focus functions operate on.") 98 | 99 | (defvar-local focus-pre-overlay nil 100 | "The overlay that dims the text prior to the current-point.") 101 | 102 | (defvar-local focus-mid-overlay nil 103 | "The overlay that surrounds the text of the current-point.") 104 | 105 | (defvar-local focus-post-overlay nil 106 | "The overlay that dims the text past the current-point.") 107 | 108 | (defvar-local focus-read-only-blink-timer nil 109 | "Timer started from `focus-read-only-cursor-blink'. 110 | The timer calls `focus-read-only-hide-cursor' after 111 | `focus-read-only-blink-seconds' seconds.") 112 | 113 | (defvar-local focus-update-timer nil 114 | "Timer started from `focus-update'") 115 | 116 | (defun focus-get-thing () 117 | "Return the current thing, based on `focus-mode-to-thing'. 118 | 119 | This also sets `focus-current-thing-cache' to the current thing." 120 | (or focus-current-thing 121 | focus-current-thing-cache 122 | (setq focus-current-thing-cache 123 | (let* ((modes (mapcar 'car focus-mode-to-thing)) 124 | (mode (or (cl-find major-mode modes) 125 | (apply #'derived-mode-p modes)))) 126 | (if mode (cdr (assoc mode focus-mode-to-thing)) 'sentence))))) 127 | 128 | (defun focus-bounds () 129 | "Return the current bounds, based on `focus-get-thing'." 130 | (let ((thing (focus-get-thing))) 131 | (cond ((eq thing 'org-element) 132 | (let* ((elem (org-element-at-point)) 133 | (beg (org-element-property :begin elem)) 134 | (end (org-element-property :end elem))) 135 | (cons beg end))) 136 | (t (bounds-of-thing-at-point thing))))) 137 | 138 | (defun focus-move-focus (buffer) 139 | "Move the focused section according to `focus-bounds'. 140 | 141 | If `focus-mode' is enabled, this command fires after each 142 | command." 143 | (with-current-buffer buffer 144 | (setq focus-update-timer nil) 145 | (let* ((bounds (focus-bounds))) 146 | (when bounds 147 | (focus-move-overlays (car bounds) (cdr bounds)))))) 148 | 149 | (defun focus-update () 150 | "Trigger an update of the focus. 151 | 152 | When `focus-update-idle-delay' is non-nil, start update after the 153 | specified idle delay." 154 | (if focus-update-idle-delay 155 | (unless focus-update-timer 156 | (setq focus-update-timer 157 | (run-with-idle-timer focus-update-idle-delay nil 158 | #'focus-move-focus focus-buffer))) 159 | (focus-move-focus focus-buffer))) 160 | 161 | (defun focus-move-overlays (low high) 162 | "Move the overlays to highlight the region between LOW and HIGH." 163 | (move-overlay focus-pre-overlay (point-min) low) 164 | (move-overlay focus-mid-overlay low high) 165 | (move-overlay focus-post-overlay high (point-max))) 166 | 167 | (defun focus-init () 168 | "This function is run when command `focus-mode' is enabled. 169 | 170 | It sets the `focus-pre-overlay', `focus-min-overlay', and 171 | `focus-post-overlay' to overlays; these are invisible until 172 | `focus-update' is run. It adds `focus-update' to 173 | `post-command-hook'." 174 | (unless (or focus-pre-overlay focus-post-overlay) 175 | (setq focus-pre-overlay (make-overlay (point-min) (point-min)) 176 | focus-mid-overlay (make-overlay (point-min) (point-max)) 177 | focus-post-overlay (make-overlay (point-max) (point-max)) 178 | focus-buffer (current-buffer)) 179 | (overlay-put focus-mid-overlay 'face 'focus-focused) 180 | (mapc (lambda (o) (overlay-put o 'face 'focus-unfocused)) 181 | (list focus-pre-overlay focus-post-overlay)) 182 | (setq focus-current-thing-cache nil 183 | focus-update-timer nil) 184 | (add-hook 'post-command-hook 'focus-update nil t) 185 | (add-hook 'change-major-mode-hook 'focus-terminate nil t))) 186 | 187 | (defun focus-terminate () 188 | "This function is run when command `focus-mode' is disabled. 189 | 190 | The overlays pointed to by `focus-pre-overlay', 191 | `focus-mid-overlay' and `focus-post-overlay' are deleted, and 192 | `focus-update' is removed from `post-command-hook'." 193 | (when (and focus-pre-overlay focus-post-overlay) 194 | (mapc 'delete-overlay 195 | (list focus-pre-overlay focus-mid-overlay focus-post-overlay)) 196 | (remove-hook 'post-command-hook 'focus-update t) 197 | (when focus-update-timer 198 | (cancel-timer focus-update-timer)) 199 | (setq focus-current-thing-cache nil 200 | focus-update-timer nil 201 | focus-pre-overlay nil 202 | focus-mid-overlay nil 203 | focus-post-overlay nil))) 204 | 205 | (defun focus-goto-thing (bounds) 206 | "Move point to the middle of BOUNDS." 207 | (when bounds 208 | (goto-char (/ (+ (car bounds) (cdr bounds)) 2)) 209 | (recenter nil))) 210 | 211 | (defun focus-change-thing () 212 | "Adjust the narrowness of the focused section for the current buffer. 213 | 214 | The variable `focus-mode-to-thing' dictates the default thing 215 | according to major-mode. If `focus-current-thing' is set, this 216 | default is overwritten. This function simply helps set the 217 | `focus-current-thing'." 218 | (interactive) 219 | (let* ((candidates '(defun line list org-element paragraph sentence sexp symbol word)) 220 | (thing (completing-read "Thing: " candidates))) 221 | (setq focus-current-thing (intern thing)))) 222 | 223 | (defun focus-pin () 224 | "Pin the focused section to its current location or the region, if active." 225 | (interactive) 226 | (when (bound-and-true-p focus-mode) 227 | (when (region-active-p) 228 | (focus-move-overlays (region-beginning) (region-end))) 229 | (when focus-update-timer 230 | (cancel-timer focus-update-timer)) 231 | (setq focus-update-timer nil) 232 | (remove-hook 'post-command-hook 'focus-update t))) 233 | 234 | (defun focus-unpin () 235 | "Unpin the focused section." 236 | (interactive) 237 | (when (bound-and-true-p focus-mode) 238 | (add-hook 'post-command-hook 'focus-update nil t))) 239 | 240 | (defun focus-next-thing (&optional n) 241 | "Move the point to the middle of the Nth next thing." 242 | (interactive "p") 243 | (let ((current-bounds (focus-bounds)) 244 | (thing (focus-get-thing))) 245 | (forward-thing thing n) 246 | (when (equal current-bounds (focus-bounds)) 247 | (forward-thing thing (cl-signum n))) 248 | (focus-goto-thing (focus-bounds)))) 249 | 250 | (defun focus-prev-thing (&optional n) 251 | "Move the point to the middle of the Nth previous thing." 252 | (interactive "p") 253 | (focus-next-thing (- n))) 254 | 255 | (defun focus-read-only-hide-cursor () 256 | "Hide the cursor. 257 | This function is triggered by the `focus-read-only-blink-timer', 258 | when `focus-read-only-mode' is activated." 259 | (with-current-buffer focus-buffer 260 | (when (and (bound-and-true-p focus-read-only-mode) 261 | (not (null focus-read-only-blink-timer))) 262 | (setq focus-read-only-blink-timer nil) 263 | (setq cursor-type nil)))) 264 | 265 | (defun focus-read-only-cursor-blink () 266 | "Make the cursor visible for `focus-read-only-blink-seconds'. 267 | This is added to the `pre-command-hook' when 268 | `focus-read-only-mode' is active." 269 | (with-current-buffer focus-buffer 270 | (when (and (bound-and-true-p focus-read-only-mode) 271 | (not (member last-command '(focus-next-thing focus-prev-thing)))) 272 | (when focus-read-only-blink-timer (cancel-timer focus-read-only-blink-timer)) 273 | (setq cursor-type focus-cursor-type) 274 | (setq focus-read-only-blink-timer 275 | (run-at-time focus-read-only-blink-seconds nil 276 | 'focus-read-only-hide-cursor))))) 277 | 278 | (defun focus-read-only-init () 279 | "Run when `focus-read-only-mode' is activated. 280 | Enables `read-only-mode', hides the cursor and adds 281 | `focus-read-only-cursor-blink' to `pre-command-hook'. 282 | Also `focus-read-only-terminate' is added to the `kill-buffer-hook'." 283 | (read-only-mode 1) 284 | (setq cursor-type nil 285 | focus-buffer (current-buffer)) 286 | (add-hook 'pre-command-hook 'focus-read-only-cursor-blink nil t) 287 | (add-hook 'kill-buffer-hook 'focus-read-only-terminate nil t)) 288 | 289 | (defun focus-read-only-terminate () 290 | "Run when `focus-read-only-mode' is deactivated. 291 | Disables `read-only-mode' and shows the cursor again. 292 | It cleans up the `focus-read-only-blink-timer' and hooks." 293 | (read-only-mode -1) 294 | (setq cursor-type focus-cursor-type) 295 | (when focus-read-only-blink-timer 296 | (cancel-timer focus-read-only-blink-timer)) 297 | (setq focus-read-only-blink-timer nil) 298 | (remove-hook 'pre-command-hook 'focus-read-only-cursor-blink t) 299 | (remove-hook 'kill-buffer-hook 'focus-read-only-terminate t)) 300 | 301 | (defun focus-turn-off-focus-read-only-mode () 302 | "Turn off `focus-read-only-mode'." 303 | (interactive) 304 | (focus-read-only-mode -1)) 305 | 306 | ;;;###autoload 307 | (define-minor-mode focus-mode 308 | "Dim the font color of text in surrounding sections." 309 | :init-value nil 310 | :keymap (let ((map (make-sparse-keymap))) 311 | (define-key map (kbd "C-c C-q") 'focus-read-only-mode) 312 | map) 313 | (if focus-mode (focus-init) (focus-terminate))) 314 | 315 | ;;;###autoload 316 | (define-minor-mode focus-read-only-mode 317 | "A read-only mode optimized for `focus-mode'." 318 | :init-value nil 319 | :keymap (let ((map (make-sparse-keymap))) 320 | (define-key map (kbd "n") 'focus-next-thing) 321 | (define-key map (kbd "SPC") 'focus-next-thing) 322 | (define-key map (kbd "p") 'focus-prev-thing) 323 | (define-key map (kbd "S-SPC") 'focus-prev-thing) 324 | (define-key map (kbd "i") 'focus-turn-off-focus-read-only-mode) 325 | (define-key map (kbd "q") 'focus-turn-off-focus-read-only-mode) 326 | map) 327 | (when cursor-type 328 | (setq focus-cursor-type cursor-type)) 329 | (if focus-read-only-mode (focus-read-only-init) (focus-read-only-terminate))) 330 | 331 | (provide 'focus) 332 | ;;; focus.el ends here 333 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . --------------------------------------------------------------------------------