;;; gmm-utils.el --- Utility functions for Gnus, Message and MML
-;; Copyright (C) 2006-2012 Free Software Foundation, Inc.
+;; Copyright (C) 2006-2013 Free Software Foundation, Inc.
;; Author: Reiner Steib <reiner.steib@gmx.de>
;; Keywords: news
(write-region start end filename append visit lockname))
(write-region start end filename append visit lockname mustbenew)))
-;; `flet' and `labels' got obsolete since Emacs 24.3.
-(defmacro gmm-flet (bindings &rest body)
- "Make temporary overriding function definitions.
-
-\(fn ((FUNC ARGLIST BODY...) ...) FORM...)"
- `(let (fn origs)
- (dolist (bind ',bindings)
- (setq fn (car bind))
- (push (cons fn (and (fboundp fn) (symbol-function fn))) origs)
- (fset fn (cons 'lambda (cdr bind))))
- (unwind-protect
- (progn ,@body)
- (dolist (orig origs)
- (if (cdr orig)
- (fset (car orig) (cdr orig))
- (fmakunbound (car orig)))))))
-(put 'gmm-flet 'lisp-indent-function 1)
-
-;; An alist of original function names and those unique names.
-(defvar gmm-labels-environment)
-
-(defun gmm-labels-expand (form)
- "Expand funcalls in FORM according to `gmm-labels-environment'.
-This function is a subroutine that `gmm-labels' uses to convert any
-`(FN ...)' and #'FN elements in FORM into `(funcall UN ...)' and `UN'
-respectively if `(FN . UN)' is listed in `gmm-labels-environment'."
- (cond ((or (not (consp form)) (memq (car form) '(\` backquote quote)))
- form)
- ((assq (car form) gmm-labels-environment)
- `(funcall ,(cdr (assq (car form) gmm-labels-environment))
- ,@(mapcar #'gmm-labels-expand (cdr form))))
- ((eq (car form) 'function)
- (if (and (assq (cadr form) gmm-labels-environment)
- (not (cddr form)))
- (cdr (assq (cadr form) gmm-labels-environment))
- (cons 'function (mapcar #'gmm-labels-expand (cdr form)))))
- (t
- (mapcar #'gmm-labels-expand form))))
-
+;; `interactive-p' is obsolete since Emacs 23.2.
+(defmacro gmm-called-interactively-p (kind)
+ (condition-case nil
+ (progn
+ (eval '(called-interactively-p 'any))
+ ;; Emacs >=23.2
+ `(called-interactively-p ,kind))
+ ;; Emacs <23.2
+ (wrong-number-of-arguments '(called-interactively-p))
+ ;; XEmacs
+ (void-function '(interactive-p))))
+
+;; `labels' is obsolete since Emacs 24.3.
(defmacro gmm-labels (bindings &rest body)
"Make temporary function bindings.
-The lexical scoping is handled via `lexical-let' rather than relying
-on `lexical-binding'.
+The bindings can be recursive and the scoping is lexical, but capturing
+them in closures will only work if `lexical-binding' is in use. But in
+Emacs 24.2 and older, the lexical scoping is handled via `lexical-let'
+rather than relying on `lexical-binding'.
\(fn ((FUNC ARGLIST BODY...) ...) FORM...)"
- (let (gmm-labels-environment def defs)
- (dolist (binding bindings)
- (push (cons (car binding)
- (make-symbol (format "--gmm-%s--" (car binding))))
- gmm-labels-environment))
- `(lexical-let ,(mapcar #'cdr gmm-labels-environment)
- (setq ,@(dolist (env gmm-labels-environment (nreverse defs))
- (setq def (cdr (assq (car env) bindings)))
- (push (cdr env) defs)
- (push `(lambda ,(car def)
- ,@(mapcar #'gmm-labels-expand (cdr def)))
- defs)))
- ,@(mapcar #'gmm-labels-expand body))))
+ `(,(progn (require 'cl) (if (fboundp 'cl-labels) 'cl-labels 'labels))
+ ,bindings ,@body))
(put 'gmm-labels 'lisp-indent-function 1)
(provide 'gmm-utils)