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1 | ;;; mh-acros.el --- Macros used in MH-E |
2 | ||
632146e3 | 3 | ;; Copyright (C) 2005 Free Software Foundation, Inc. |
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4 | |
5 | ;; Author: Satyaki Das <satyaki@theforce.stanford.edu> | |
6 | ;; Maintainer: Bill Wohler <wohler@newt.com> | |
7 | ;; Keywords: mail | |
8 | ;; See: mh-e.el | |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
14 | ;; the Free Software Foundation; either version 2, or (at your option) | |
15 | ;; any later version. | |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
25 | ;; Boston, MA 02111-1307, USA. | |
26 | ||
27 | ;;; Commentary: | |
28 | ||
29 | ;; This file contains macros that would normally be in mh-utils.el except that | |
30 | ;; their presence there would cause a dependency loop with mh-customize.el. | |
31 | ;; This file must always be included like this: | |
32 | ;; | |
33 | ;; (eval-when-compile (require 'mh-acros)) | |
34 | ;; | |
35 | ;; It is so named with a silent `m' so that it is compiled first. Otherwise, | |
36 | ;; "make recompile" in Emacs 21.4 fails. | |
37 | ||
38 | ;;; Change Log: | |
39 | ||
40 | ;;; Code: | |
41 | ||
42 | (require 'cl) | |
43 | ||
44 | ;; The Emacs coding conventions require that the cl package not be required at | |
45 | ;; runtime. However, the cl package in versions of Emacs prior to 21.4 left cl | |
46 | ;; routines in their macro expansions. Use mh-require-cl to provide the cl | |
47 | ;; routines in the best way possible. | |
48 | (defmacro mh-require-cl () | |
49 | "Macro to load `cl' if needed. | |
50 | Some versions of `cl' produce code for the expansion of | |
51 | \(setf (gethash ...) ...) that uses functions in `cl' at run time. This macro | |
52 | recognizes that and loads `cl' where appropriate." | |
53 | (if (eq (car (macroexpand '(setf (gethash foo bar) baz))) 'cl-puthash) | |
eccf9613 | 54 | `(require 'cl) |
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55 | `(eval-when-compile (require 'cl)))) |
56 | ||
57 | ;;; Macros to generate correct code for different emacs variants | |
58 | ||
59 | (defmacro mh-do-in-gnu-emacs (&rest body) | |
60 | "Execute BODY if in GNU Emacs." | |
61 | (unless (featurep 'xemacs) `(progn ,@body))) | |
62 | (put 'mh-do-in-gnu-emacs 'lisp-indent-hook 'defun) | |
63 | ||
64 | (defmacro mh-do-in-xemacs (&rest body) | |
65 | "Execute BODY if in GNU Emacs." | |
66 | (when (featurep 'xemacs) `(progn ,@body))) | |
67 | (put 'mh-do-in-xemacs 'lisp-indent-hook 'defun) | |
68 | ||
69 | (defmacro mh-funcall-if-exists (function &rest args) | |
70 | "Call FUNCTION with ARGS as parameters if it exists." | |
71 | (if (fboundp function) | |
72 | `(funcall ',function ,@args))) | |
73 | ||
74 | (defmacro mh-make-local-hook (hook) | |
75 | "Make HOOK local if needed. | |
76 | XEmacs and versions of GNU Emacs before 21.1 require `make-local-hook' to be | |
77 | called." | |
78 | (when (and (fboundp 'make-local-hook) | |
79 | (not (get 'make-local-hook 'byte-obsolete-info))) | |
80 | `(make-local-hook ,hook))) | |
81 | ||
82 | (defmacro mh-mark-active-p (check-transient-mark-mode-flag) | |
83 | "A macro that expands into appropriate code in XEmacs and nil in GNU Emacs. | |
84 | In GNU Emacs if CHECK-TRANSIENT-MARK-MODE-FLAG is non-nil then check if | |
85 | variable `transient-mark-mode' is active." | |
86 | (cond ((featurep 'xemacs) ;XEmacs | |
87 | `(and (boundp 'zmacs-regions) zmacs-regions (region-active-p))) | |
88 | ((not check-transient-mark-mode-flag) ;GNU Emacs | |
89 | `(and (boundp 'mark-active) mark-active)) | |
90 | (t ;GNU Emacs | |
91 | `(and (boundp 'transient-mark-mode) transient-mark-mode | |
92 | (boundp 'mark-active) mark-active)))) | |
93 | ||
94 | (defmacro mh-defstruct (name-spec &rest fields) | |
95 | "Replacement for `defstruct' from the `cl' package. | |
96 | The `defstruct' in the `cl' library produces compiler warnings, and generates | |
97 | code that uses functions present in `cl' at run-time. This is a partial | |
98 | replacement, that avoids these issues. | |
99 | ||
100 | NAME-SPEC declares the name of the structure, while FIELDS describes the | |
101 | various structure fields. Lookup `defstruct' for more details." | |
102 | (let* ((struct-name (if (atom name-spec) name-spec (car name-spec))) | |
103 | (conc-name (or (and (consp name-spec) | |
104 | (cadr (assoc :conc-name (cdr name-spec)))) | |
105 | (format "%s-" struct-name))) | |
106 | (predicate (intern (format "%s-p" struct-name))) | |
107 | (constructor (or (and (consp name-spec) | |
108 | (cadr (assoc :constructor (cdr name-spec)))) | |
109 | (intern (format "make-%s" struct-name)))) | |
110 | (field-names (mapcar #'(lambda (x) (if (atom x) x (car x))) fields)) | |
111 | (field-init-forms (mapcar #'(lambda (x) (and (consp x) (cadr x))) | |
112 | fields)) | |
113 | (struct (gensym "S")) | |
114 | (x (gensym "X")) | |
115 | (y (gensym "Y"))) | |
116 | `(progn | |
117 | (defun* ,constructor (&key ,@(mapcar* #'(lambda (x y) (list x y)) | |
118 | field-names field-init-forms)) | |
d103d8b3 | 119 | (list (quote ,struct-name) ,@field-names)) |
863e5e39 | 120 | (defun ,predicate (arg) |
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121 | (and (consp arg) (eq (car arg) (quote ,struct-name)))) |
122 | ,@(loop for x from 1 | |
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123 | for y in field-names |
124 | collect `(defmacro ,(intern (format "%s%s" conc-name y)) (z) | |
125 | (list 'nth ,x z))) | |
126 | (quote ,struct-name)))) | |
127 | ||
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128 | (defadvice require (around mh-prefer-el activate) |
129 | "Modify `require' to load uncompiled MH-E files." | |
130 | (or (featurep (ad-get-arg 0)) | |
131 | (and (string-match "^mh-" (symbol-name (ad-get-arg 0))) | |
132 | (load (format "%s.el" (ad-get-arg 0)) t t)) | |
133 | ad-do-it)) | |
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134 | |
135 | (provide 'mh-acros) | |
136 | ||
137 | ;;; Local Variables: | |
138 | ;;; no-byte-compile: t | |
139 | ;;; indent-tabs-mode: nil | |
140 | ;;; sentence-end-double-space: nil | |
141 | ;;; End: | |
142 | ||
b22103fe | 143 | ;; arch-tag: b383b49a-494f-4ed0-a30a-cb6d5d2da4ff |
863e5e39 | 144 | ;;; mh-acros.el ends here |