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1 | ;;; erc-compat.el --- ERC compatibility code for XEmacs |
2 | ||
f0fa15c5 | 3 | ;; Copyright (C) 2002, 2003, 2005, 2006, 2007 Free Software Foundation, Inc. |
597993cf MB |
4 | |
5 | ;; Author: Alex Schroeder <alex@gnu.org> | |
83dc6995 | 6 | ;; URL: http://www.emacswiki.org/cgi-bin/wiki/ERC |
597993cf MB |
7 | |
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
22 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
23 | ;; Boston, MA 02110-1301, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; This mostly defines stuff that cannot be worked around easily. | |
28 | ||
29 | ;;; Code: | |
30 | ||
31 | (require 'format-spec) | |
32 | ||
33 | ;;;###autoload (autoload 'erc-define-minor-mode "erc-compat") | |
34 | (defalias 'erc-define-minor-mode 'define-minor-mode) | |
35 | (put 'erc-define-minor-mode 'edebug-form-spec 'define-minor-mode) | |
36 | ||
37 | (defun erc-decode-coding-string (s coding-system) | |
38 | "Decode S using CODING-SYSTEM." | |
39 | (decode-coding-string s coding-system t)) | |
40 | ||
41 | (defun erc-encode-coding-string (s coding-system) | |
42 | "Encode S using CODING-SYSTEM. | |
43 | Return the same string, if the encoding operation is trivial. | |
44 | See `erc-encoding-coding-alist'." | |
45 | (encode-coding-string s coding-system t)) | |
46 | ||
47 | (defalias 'erc-propertize 'propertize) | |
48 | (defalias 'erc-view-mode-enter 'view-mode-enter) | |
49 | (defalias 'erc-function-arglist 'help-function-arglist) | |
50 | (defalias 'erc-delete-dups 'delete-dups) | |
51 | (defalias 'erc-replace-regexp-in-string 'replace-regexp-in-string) | |
52 | ||
53 | (defvar erc-emacs-build-time | |
54 | (if (stringp emacs-build-time) | |
55 | emacs-build-time | |
56 | (format-time-string "%Y-%m-%d" emacs-build-time)) | |
57 | "Time at which Emacs was dumped out.") | |
58 | ||
59 | ;; XEmacs' `replace-match' does not replace matching subexpressions in strings. | |
60 | (defun erc-replace-match-subexpression-in-string | |
61 | (newtext string match subexp start &optional fixedcase literal) | |
62 | "Replace the subexpression SUBEXP of the last match in STRING with NEWTEXT. | |
63 | MATCH is the text which matched the subexpression (see `match-string'). | |
64 | START is the beginning position of the last match (see `match-beginning'). | |
65 | See `replace-match' for explanations of FIXEDCASE and LITERAL." | |
66 | (cond ((featurep 'xemacs) | |
67 | (string-match match string start) | |
68 | (replace-match newtext fixedcase literal string)) | |
69 | (t (replace-match newtext fixedcase literal string subexp)))) | |
70 | ||
71 | (defalias 'erc-cancel-timer 'cancel-timer) | |
72 | (defalias 'erc-make-obsolete 'make-obsolete) | |
73 | (defalias 'erc-make-obsolete-variable 'make-obsolete-variable) | |
74 | ||
75 | ;; Provde an equivalent of `assert', based on the code from cl-macs.el | |
76 | (defun erc-const-expr-p (x) | |
77 | (cond ((consp x) | |
78 | (or (eq (car x) 'quote) | |
79 | (and (memq (car x) '(function function*)) | |
80 | (or (symbolp (nth 1 x)) | |
81 | (and (eq (and (consp (nth 1 x)) | |
82 | (car (nth 1 x))) 'lambda) 'func))))) | |
83 | ((symbolp x) (and (memq x '(nil t)) t)) | |
84 | (t t))) | |
85 | ||
86 | (put 'erc-assertion-failed 'error-conditions '(error)) | |
87 | (put 'erc-assertion-failed 'error-message "Assertion failed") | |
88 | ||
89 | (defun erc-list* (arg &rest rest) | |
90 | "Return a new list with specified args as elements, cons'd to last arg. | |
91 | Thus, `(list* A B C D)' is equivalent to `(nconc (list A B C) D)', or to | |
92 | `(cons A (cons B (cons C D)))'." | |
93 | (cond ((not rest) arg) | |
94 | ((not (cdr rest)) (cons arg (car rest))) | |
95 | (t (let* ((n (length rest)) | |
96 | (copy (copy-sequence rest)) | |
97 | (last (nthcdr (- n 2) copy))) | |
98 | (setcdr last (car (cdr last))) | |
99 | (cons arg copy))))) | |
100 | ||
101 | (defmacro erc-assert (form &optional show-args string &rest args) | |
102 | "Verify that FORM returns non-nil; signal an error if not. | |
103 | Second arg SHOW-ARGS means to include arguments of FORM in message. | |
104 | Other args STRING and ARGS... are arguments to be passed to `error'. | |
105 | They are not evaluated unless the assertion fails. If STRING is | |
106 | omitted, a default message listing FORM itself is used." | |
107 | (let ((sargs | |
108 | (and show-args | |
109 | (delq nil (mapcar | |
110 | (function | |
111 | (lambda (x) | |
112 | (and (not (erc-const-expr-p x)) x))) | |
113 | (cdr form)))))) | |
114 | (list 'progn | |
115 | (list 'or form | |
116 | (if string | |
117 | (erc-list* 'error string (append sargs args)) | |
118 | (list 'signal '(quote erc-assertion-failed) | |
119 | (erc-list* 'list (list 'quote form) sargs)))) | |
120 | nil))) | |
121 | ||
122 | ;; Provide a simpler replacement for `member-if' | |
123 | (defun erc-member-if (predicate list) | |
124 | "Find the first item satisfying PREDICATE in LIST. | |
125 | Return the sublist of LIST whose car matches." | |
126 | (let ((ptr list)) | |
127 | (catch 'found | |
128 | (while ptr | |
129 | (when (funcall predicate (car ptr)) | |
130 | (throw 'found ptr)) | |
131 | (setq ptr (cdr ptr)))))) | |
132 | ||
133 | ;; Provide a simpler replacement for `delete-if' | |
134 | (defun erc-delete-if (predicate seq) | |
135 | "Remove all items satisfying PREDICATE in SEQ. | |
136 | This is a destructive function: it reuses the storage of SEQ | |
137 | whenever possible." | |
138 | ;; remove from car | |
139 | (while (when (funcall predicate (car seq)) | |
140 | (setq seq (cdr seq)))) | |
141 | ;; remove from cdr | |
142 | (let ((ptr seq) | |
143 | (next (cdr seq))) | |
144 | (while next | |
145 | (when (funcall predicate (car next)) | |
146 | (setcdr ptr (if (consp next) | |
147 | (cdr next) | |
148 | nil))) | |
149 | (setq ptr (cdr ptr)) | |
150 | (setq next (cdr ptr)))) | |
151 | seq) | |
152 | ||
153 | ;; Provide a simpler replacement for `remove-if-not' | |
154 | (defun erc-remove-if-not (predicate seq) | |
155 | "Remove all items not satisfying PREDICATE in SEQ. | |
156 | This is a non-destructive function; it makes a copy of SEQ to | |
157 | avoid corrupting the original SEQ." | |
158 | (let (newseq) | |
159 | (dolist (el seq) | |
160 | (when (funcall predicate el) | |
161 | (setq newseq (cons el newseq)))) | |
162 | (nreverse newseq))) | |
163 | ||
164 | ;; Provide a simpler replacement for `gensym'. | |
165 | (defvar *erc-sym-counter* 0) | |
166 | (defun erc-gensym () | |
167 | "Generate a new uninterned symbol." | |
168 | (let ((num (prog1 *erc-sym-counter* | |
169 | (setq *erc-sym-counter* (1+ *erc-sym-counter*))))) | |
170 | (make-symbol (format "*erc-sym-%d*" num)))) | |
171 | ||
172 | ;; Copied from cl-extra.el | |
173 | (defun erc-subseq (seq start &optional end) | |
174 | "Return the subsequence of SEQ from START to END. | |
175 | If END is omitted, it defaults to the length of the sequence. | |
176 | If START or END is negative, it counts from the end." | |
177 | (if (stringp seq) (substring seq start end) | |
178 | (let (len) | |
179 | (and end (< end 0) (setq end (+ end (setq len (length seq))))) | |
180 | (if (< start 0) (setq start (+ start (or len (setq len (length seq)))))) | |
181 | (cond ((listp seq) | |
182 | (if (> start 0) (setq seq (nthcdr start seq))) | |
183 | (if end | |
184 | (let ((res nil)) | |
185 | (while (>= (setq end (1- end)) start) | |
186 | (push (pop seq) res)) | |
187 | (nreverse res)) | |
188 | (copy-sequence seq))) | |
189 | (t | |
190 | (or end (setq end (or len (length seq)))) | |
191 | (let ((res (make-vector (max (- end start) 0) nil)) | |
192 | (i 0)) | |
193 | (while (< start end) | |
194 | (aset res i (aref seq start)) | |
195 | (setq i (1+ i) start (1+ start))) | |
196 | res)))))) | |
197 | ||
198 | (provide 'erc-compat) | |
199 | ||
200 | ;;; erc-compat.el ends here | |
201 | ;; | |
202 | ;; Local Variables: | |
203 | ;; indent-tabs-mode: t | |
204 | ;; tab-width: 8 | |
205 | ;; End: | |
206 | ||
207 | ;; arch-tag: 8948ffe0-aff8-4ad8-a196-368ebbfd58ff |