3 ;; ruby-electric.el --- electric editing commands for ruby files
5 ;; Copyright (C) 2005 by Dee Zsombor <dee dot zsombor at gmail dot com>.
6 ;; Released under same license terms as Ruby.
8 ;; Due credit: this work was inspired by a code snippet posted by
9 ;; Frederick Ros at http://rubygarden.org/ruby?EmacsExtensions.
11 ;; Following improvements where added:
13 ;; - handling of strings of type 'here document'
14 ;; - more keywords, with special handling for 'do'
15 ;; - packaged into a minor mode
19 ;; 0) copy ruby-electric.el into directory where emacs can find it.
21 ;; 1) modify your startup file (.emacs or whatever) by adding
24 ;; (require 'ruby-electric)
26 ;; note that you need to have font lock enabled beforehand.
28 ;; 2) toggle Ruby Electric Mode on/off with ruby-electric-mode.
32 ;; 2005/Jan/14: inserts matching pair delimiters like {, [, (, ', ",
35 ;; 2005/Jan/14: added basic Custom support for configuring keywords
36 ;; with electric closing.
38 ;; 2005/Jan/18: more Custom support for configuring characters for
39 ;; which matching expansion should occur.
41 ;; 2005/Jan/18: no longer uses 'looking-back' or regexp character
42 ;; classes like [:space:] since they are not implemented on XEmacs.
44 ;; 2005/Feb/01: explicitly provide default argument of 1 to
45 ;; 'backward-word' as it requires it on Emacs 21.3
47 ;; 2005/Mar/06: now stored inside ruby CVS; customize pages now have
48 ;; ruby as parent; cosmetic fixes.
53 (defgroup ruby-electric nil
54 "Minor mode providing electric editing commands for ruby files"
57 (defconst ruby-electric-expandable-do-re
60 (defconst ruby-electric-expandable-bar
61 "\\s-\\(do\\|{\\)\\s-+|")
63 (defvar ruby-electric-matching-delimeter-alist
70 (defcustom ruby-electric-simple-keywords-re
71 "\\(def\\|if\\|class\\|module\\|unless\\|case\\|while\\|do\\|until\\|for\\|begin\\)"
72 "*Regular expresion matching keywords for which closing 'end'
74 :type 'regexp :group 'ruby-electric)
76 (defcustom ruby-electric-expand-delimiters-list '(all)
77 "*List of contexts where matching delimiter should be
78 inserted. The word 'all' will do all insertions."
79 :type '(set :extra-offset 8
80 (const :tag "Everything" all )
81 (const :tag "Curly brace" ?\{ )
82 (const :tag "Square brace" ?\[ )
83 (const :tag "Round brace" ?\( )
84 (const :tag "Quote" ?\' )
85 (const :tag "Double quote" ?\" )
86 (const :tag "Back quote" ?\` )
87 (const :tag "Vertical bar" ?\| ))
88 :group 'ruby-electric)
90 (defcustom ruby-electric-newline-before-closing-bracket nil
91 "*Controls whether a newline should be inserted before the
92 closing bracket or not."
93 :type 'boolean :group 'ruby-electric)
95 ;;;###autoload (autoload 'ruby-electric-mode "ruby-electric" "Toggle Ruby Electric minor mode" t)
96 (define-minor-mode ruby-electric-mode
97 "Toggle Ruby Electric minor mode.
98 With no argument, this command toggles the mode. Non-null prefix
99 argument turns on the mode. Null prefix argument turns off the
102 When Ruby Electric mode is enabled, an indented 'end' is
103 heuristicaly inserted whenever typing a word like 'module',
104 'class', 'def', 'if', 'unless', 'case', 'until', 'for', 'begin',
105 'do'. Simple, double and back quotes as well as braces are paired
106 auto-magically. Expansion does not occur inside comments and
107 strings. Note that you must have Font Lock enabled."
110 ;;indicator for the mode line.
114 (ruby-electric-setup-keymap))
116 (defun ruby-electric-setup-keymap()
117 (define-key ruby-mode-map " " 'ruby-electric-space)
118 (define-key ruby-mode-map "{" 'ruby-electric-curlies)
119 (define-key ruby-mode-map "(" 'ruby-electric-matching-char)
120 (define-key ruby-mode-map "[" 'ruby-electric-matching-char)
121 (define-key ruby-mode-map "\"" 'ruby-electric-matching-char)
122 (define-key ruby-mode-map "\'" 'ruby-electric-matching-char)
123 (define-key ruby-mode-map "|" 'ruby-electric-bar))
125 (defun ruby-electric-space (arg)
127 (self-insert-command (prefix-numeric-value arg))
128 (if (ruby-electric-space-can-be-expanded-p)
134 (defun ruby-electric-code-at-point-p()
135 (and ruby-electric-mode
136 (let* ((properties (text-properties-at (point))))
137 (and (null (memq 'font-lock-string-face properties))
138 (null (memq 'font-lock-comment-face properties))))))
140 (defun ruby-electric-string-at-point-p()
141 (and ruby-electric-mode
142 (consp (memq 'font-lock-string-face (text-properties-at (point))))))
144 (defun ruby-electric-is-last-command-char-expandable-punct-p()
145 (or (memq 'all ruby-electric-expand-delimiters-list)
146 (memq last-command-char ruby-electric-expand-delimiters-list)))
148 (defun ruby-electric-space-can-be-expanded-p()
149 (if (ruby-electric-code-at-point-p)
150 (let* ((ruby-electric-keywords-re
151 (concat ruby-electric-simple-keywords-re "\\s-$"))
152 (ruby-electric-single-keyword-in-line-re
153 (concat "\\s-*" ruby-electric-keywords-re)))
156 (or (looking-at ruby-electric-expandable-do-re)
157 (and (looking-at ruby-electric-keywords-re)
158 (not (string= "do" (match-string 1)))
161 (looking-at ruby-electric-single-keyword-in-line-re))))))))
164 (defun ruby-electric-curlies(arg)
166 (self-insert-command (prefix-numeric-value arg))
167 (if (ruby-electric-is-last-command-char-expandable-punct-p)
168 (cond ((ruby-electric-code-at-point-p)
171 (if ruby-electric-newline-before-closing-bracket
174 ((ruby-electric-string-at-point-p)
177 (when (char-equal ?\# (preceding-char))
181 (defun ruby-electric-matching-char(arg)
183 (self-insert-command (prefix-numeric-value arg))
184 (and (ruby-electric-is-last-command-char-expandable-punct-p)
185 (ruby-electric-code-at-point-p)
187 (insert (cdr (assoc last-command-char
188 ruby-electric-matching-delimeter-alist))))))
190 (defun ruby-electric-bar(arg)
192 (self-insert-command (prefix-numeric-value arg))
193 (and (ruby-electric-is-last-command-char-expandable-punct-p)
194 (ruby-electric-code-at-point-p)
195 (and (save-excursion (re-search-backward ruby-electric-expandable-bar nil t))
196 (= (point) (match-end 0))) ;looking-back is missing on XEmacs
200 (provide 'ruby-electric)
202 ;;; ruby-electric.el ends here