├── .gitignore ├── LICENSE ├── README.md ├── easy-escape.el └── img ├── easy-escape.png └── ee-screenshot.el /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled 2 | *.elc 3 | 4 | # Packaging 5 | .cask 6 | -------------------------------------------------------------------------------- /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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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 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 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 | {project} Copyright (C) {year} {fullname} 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 | . 675 | 676 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # `easy-escape` 2 | 3 | ![Easy-escape: before and after](img/easy-escape.png) 4 | 5 | `easy-escape-minor-mode` uses syntax highlighting and composition to make ELisp regular expressions more readable. More precisely, it hides double backslashes preceding regexp specials (`()|`), composes other double backslashes into single ones, and applies a special face to each. The underlying buffer text is not modified. 6 | 7 | The default is to use a single \ character instead of two, and to hide backslashes preceding parentheses or `|`. The escape character and its color can be customized using `easy-escape-face` and `easy-escape-character` (which see), and backslashes before `()|` can be shown by disabling `easy-escape-hide-escapes-before-delimiters`. 8 | 9 | ## Setup 10 | 11 | ### MELPA (preferred) 12 | 13 | 1. Setup [MELPA](http://melpa.org/#/getting-started) if you haven't yet 14 | 15 | In your `.emacs`, add these three lines: 16 | 17 | ```elisp 18 | (require 'package) 19 | (add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/") t) 20 | (package-initialize) 21 | ``` 22 | 23 | 2. Install the package: `M-x package-install RET easy-escape RET` 24 | 25 | 3. Enable `easy-escape-minor-mode` in Lisp buffers: 26 | 27 | ```elisp 28 | ;; Replace 'lisp-mode-hook with 'prog-mode-hook to enable everywhere 29 | (add-hook 'lisp-mode-hook 'easy-escape-minor-mode) 30 | (add-hook 'emacs-lisp-mode-hook 'easy-escape-minor-mode) 31 | ``` 32 | 33 | ### Alternative setup 34 | 35 | 1. Download [this file](https://raw.githubusercontent.com/cpitclaudel/easy-escape/master/easy-escape.el) 36 | 37 | 2. Add this to your .emacs: 38 | 39 | ```elisp 40 | (load-file "PATH-TO-THE-FILE-YOU-JUST-DOWNLOADED") 41 | (add-hook 'lisp-mode-hook 'easy-escape-minor-mode) 42 | ``` 43 | 44 | ## Fine-tuning 45 | 46 | * If you find the distinction between the fontified double-slash and the 47 | single slash too subtle, try the following: 48 | 49 | * Adjust the foreground of `easy-escape-face`: 50 | 51 | ```elisp 52 | (set-face-attribute 'easy-escape-face nil :foreground "red") 53 | ``` 54 | 55 | * Set `easy-escape-character` to a different character: 56 | 57 | ```elisp 58 | (setq easy-escape-character ?╲) 59 | ``` 60 | -------------------------------------------------------------------------------- /easy-escape.el: -------------------------------------------------------------------------------- 1 | ;;; easy-escape.el --- Improve readability of escape characters in regular expressions -*- lexical-binding: t; -*- 2 | 3 | ;; Copyright (C) 2015, 2016, 2021 Free Software Foundation, Inc. 4 | ;; Author: Clément Pit-Claudel 5 | ;; Version: 0.2.1 6 | ;; Keywords: convenience, lisp, tools 7 | ;; URL: https://github.com/cpitclaudel/easy-escape 8 | 9 | ;; This program is free software; you can redistribute it and/or modify 10 | ;; it under the terms of the GNU General Public License as published by 11 | ;; the Free Software Foundation, either version 3 of the License, or 12 | ;; (at your option) any later version. 13 | 14 | ;; This program is distributed in the hope that it will be useful, 15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 | ;; GNU General Public License for more details. 18 | 19 | ;; You should have received a copy of the GNU General Public License 20 | ;; along with this program. If not, see . 21 | 22 | ;;; Commentary: 23 | 24 | ;; `easy-escape-minor-mode' uses syntax highlighting and composition to make ELisp regular 25 | ;; expressions more readable. More precisely, it hides double backslashes 26 | ;; preceding regexp specials (`()|'), composes other double backslashes into 27 | ;; single ones, and applies a special face to each. The underlying buffer text 28 | ;; is not modified. 29 | ;; 30 | ;; For example, `easy-escape` prettifies this: 31 | ;; "\\(?:\\_<\\\\newcommand\\_>\\s-*\\)?" 32 | ;; into this (`^' indicates a different color): 33 | ;; "(?:\_<\\newcommand\_>\s-*)?". 34 | ;; ^ ^ 35 | ;; 36 | ;; The default is to use a single \ character instead of two, and to hide 37 | ;; backslashes preceding parentheses or `|'. The escape character and its color 38 | ;; can be customized using `easy-escape-face' and `easy-escape-character' (which 39 | ;; see), and backslashes before ()| can be shown by disabling 40 | ;; `easy-escape-hide-escapes-before-delimiters'. 41 | ;; 42 | ;; Suggested setup: 43 | ;; (add-hook 'lisp-mode-hook 'easy-escape-minor-mode) 44 | ;; 45 | ;; NOTE: If you find the distinction between the fontified double-slash and the 46 | ;; single slash too subtle, try the following: 47 | ;; 48 | ;; * Adjust the foreground of `easy-escape-face' 49 | ;; * Set `easy-escape-character' to a different character. 50 | 51 | ;;; Code: 52 | 53 | (require 'font-lock) 54 | 55 | (defgroup easy-escape nil 56 | "Improve readability of escape characters." 57 | :group 'programming) 58 | 59 | (defface easy-escape-face 60 | '((t :weight bold)) 61 | "Face used to highlight \\\\ in strings." 62 | :group 'easy-escape) 63 | 64 | (defface easy-escape-delimiter-face 65 | '((t :weight bold :slant normal :inherit font-lock-warning-face)) 66 | "Face used to highlight groups and alternations in strings." 67 | :group 'easy-escape) 68 | 69 | (defcustom easy-escape-character ?\\ 70 | "Character by which \\\\ is replaced when `easy-escape-minor-mode' is active. 71 | Good candidates include the following: 72 | \\ REVERSE SOLIDUS (the default, typed as '?\\\\') 73 | ╲ BOX DRAWINGS LIGHT DIAGONAL UPPER LEFT TO LOWER RIGHT (typed as '?╲') 74 | ⟍ MATHEMATICAL FALLING DIAGONAL (typed as '?⟍') 75 | ⑊ OCR DOUBLE BACKSLASH (typed as '?⑊') 76 | ⤡ NORTH WEST AND SOUTH EAST ARROW (typed as '?⤡') 77 | ↘ SOUTH EAST ARROW (typed as '?↘') 78 | ⇘ SOUTH EAST DOUBLE ARROW (typed as '?⇘') 79 | ⦥ MATHEMATICAL REVERSED ANGLE WITH UNDERBAR (typed as '?⦥') 80 | ⦣ MATHEMATICAL REVERSED ANGLE (typed as '?⦣') 81 | ⧹ BIG REVERSE SOLIDUS (typed as '?⧹') 82 | Most of these characters require non-standard fonts to display properly, 83 | however." 84 | :group 'easy-escape 85 | :type 'character) 86 | 87 | (defcustom easy-escape-hide-escapes-before-delimiters t 88 | "Whether to hide \\\\ when it precedes one of `(', `|', and `)'." 89 | :group 'easy-escape 90 | :type 'boolean) 91 | 92 | ;; FIXME use ppss? 93 | (defun easy-escape--in-string-p (pos) 94 | "Indicate whether POS is inside a string." 95 | (let ((face (get-text-property pos 'face))) 96 | (or (eq 'font-lock-doc-face face) 97 | (eq 'font-lock-string-face face) 98 | (and (listp face) (or (memq 'font-lock-doc-face face) 99 | (memq 'font-lock-string-face face)))))) 100 | 101 | (defun easy-escape--find-in-string (re lim) 102 | "Find next match for RE before LIM that falls in a string." 103 | (catch 'found 104 | (while (re-search-forward re lim t) 105 | (when (easy-escape--in-string-p (match-beginning 0)) 106 | (throw 'found t))))) 107 | 108 | (defun easy-escape--find-escape (limit) 109 | "Search for \\\\ before LIMIT." 110 | (easy-escape--find-in-string "\\(\\\\\\\\\\)" limit)) 111 | 112 | (defun easy-escape--find-delim (limit) 113 | "Search for a delimiter or alternation before LIMIT." 114 | (easy-escape--find-in-string "\\(\\\\\\\\\\)\\([()|]\\)" limit)) 115 | 116 | (defun easy-escape--compose (n char) 117 | "Compose match group N into CHAR." 118 | (compose-region (match-beginning n) (match-end n) char)) 119 | 120 | (defconst easy-escape--keywords 121 | '((easy-escape--find-escape 122 | (0 (progn (easy-escape--compose 0 easy-escape-character) 'easy-escape-face) prepend)) 123 | (easy-escape--find-delim 124 | (0 (progn (easy-escape--compose 0 (char-after (match-beginning 2))) 'easy-escape-delimiter-face) prepend))) 125 | "Font-lock keyword list used internally.") 126 | 127 | ;;;###autoload 128 | (define-minor-mode easy-escape-minor-mode 129 | "Compose escape signs together to make regexps more readable. 130 | When this mode is active, \\\\ in strings is displayed as a 131 | single \\, fontified using `easy-escape-face' and composed into 132 | `easy-escape-character'. 133 | 134 | If you find the distinction between the fontified double-slash 135 | and the single slash too subtle, try the following: 136 | 137 | * Adjust the foreground of `easy-escape-face' 138 | * Set `easy-escape-character' to a different character." 139 | :lighter " ez-esc" 140 | :group 'easy-escape 141 | (cond 142 | (easy-escape-minor-mode 143 | (font-lock-add-keywords nil easy-escape--keywords) 144 | (make-local-variable 'font-lock-extra-managed-props) 145 | (add-to-list 'font-lock-extra-managed-props 'composition)) 146 | (t (font-lock-remove-keywords nil easy-escape--keywords))) 147 | (if (>= emacs-major-version 25) (font-lock-flush) 148 | (with-no-warnings (font-lock-fontify-buffer)))) 149 | 150 | (provide 'easy-escape) 151 | ;;; easy-escape.el ends here 152 | -------------------------------------------------------------------------------- /img/easy-escape.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cpitclaudel/easy-escape/938497a21e65ba6b3ff8ec90e93a6d0ab18dc9b4/img/easy-escape.png -------------------------------------------------------------------------------- /img/ee-screenshot.el: -------------------------------------------------------------------------------- 1 | ;;; ee-screenshot.el --- Prepare a screenshot for easy-escape -*- lexical-binding: t; -*- 2 | 3 | ;; Copyright (C) 2016 Free Software Foundation, Inc. 4 | ;; Author: Clément Pit-Claudel 5 | ;; Keywords: 6 | 7 | ;; This program is free software; you can redistribute it and/or modify 8 | ;; it under the terms of the GNU General Public License as published by 9 | ;; the Free Software Foundation, either version 3 of the License, or 10 | ;; (at your option) any later version. 11 | 12 | ;; This program is distributed in the hope that it will be useful, 13 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of 14 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 | ;; GNU General Public License for more details. 16 | 17 | ;; You should have received a copy of the GNU General Public License 18 | ;; along with this program. If not, see . 19 | 20 | ;;; Commentary: 21 | 22 | ;; emacs -Q -l ~/.emacs.d/lisp/screenshot/screenshot.el -l ee-screenshot.el -f '~/main' 23 | 24 | ;;; Code: 25 | 26 | (add-to-list 'load-path "../") 27 | (require 'easy-escape) 28 | (require 'screenshot) 29 | 30 | (defvar ~/strs 31 | '(("^\\([aA]\\)\\(#\\|!\\)\\([ \\t\\n\\v\\r]*\\)[:/]\\(\\\\\\)\\(...\\)$") 32 | ("\\.\\(gz\\|Z\\|bz\\|bz2\\|xz\\|gpg\\)\\'" "\\((\\||\\|)\\)"))) 33 | 34 | (defun ~/setup (buf mode-status prelude) 35 | (with-current-buffer buf 36 | (emacs-lisp-mode) 37 | (easy-escape-minor-mode mode-status) 38 | (insert prelude "\n") 39 | (dolist (strs ~/strs) 40 | (insert " " (mapconcat #'prin1-to-string strs " ") "\n")) 41 | (setq cursor-type nil) 42 | (goto-char (point-min)) 43 | (set-buffer-modified-p nil))) 44 | 45 | (defun ~/main () 46 | (interactive) 47 | (let ((before (get-buffer-create "*before*")) 48 | (after (get-buffer-create "*after*"))) 49 | (~/setup before -1 "\n ;; Before:") 50 | (~/setup after 1 " ;; After:") 51 | (switch-to-buffer before) 52 | (switch-to-buffer-other-window after)) 53 | ;; (with-current-buffer before 54 | (setq-default mode-line-format nil) 55 | (screenshot-ui-setup 72 4) 56 | (run-with-timer 3 nil #'screenshot-capture "easy-escape.png") 57 | (run-with-timer 4 nil #'kill-emacs)) 58 | 59 | (provide 'ee-screenshot) 60 | ;;; ee-screenshot.el ends here 61 | --------------------------------------------------------------------------------