;;; gmm-utils.el --- Utility functions for Gnus, Message and MML
-;; Copyright (C) 2006-2012 Free Software Foundation, Inc.
+;; Copyright (C) 2006-2014 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)))
+;; `interactive-p' is obsolete since Emacs 23.2.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))))
+
+;; `flet' and `labels' are obsolete since Emacs 24.3.
+(defmacro gmm-flet (bindings &rest body)
+ "Make temporary overriding function definitions.
+This is an analogue of a dynamically scoped `let' that operates on
+the function cell of FUNCs rather than their value cell.
+
+\(fn ((FUNC ARGLIST BODY...) ...) FORM...)"
+ (require 'cl)
+ (if (fboundp 'cl-letf)
+ `(cl-letf ,(mapcar (lambda (binding)
+ `((symbol-function ',(car binding))
+ (lambda ,@(cdr binding))))
+ bindings)
+ ,@body)
+ `(flet ,bindings ,@body)))
+(put 'gmm-flet 'lisp-indent-function 1)
+
+(defmacro gmm-labels (bindings &rest body)
+ "Make temporary function bindings.
+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...)"
+ `(,(progn (require 'cl) (if (fboundp 'cl-labels) 'cl-labels 'labels))
+ ,bindings ,@body))
+(put 'gmm-labels 'lisp-indent-function 1)
+
(provide 'gmm-utils)
;;; gmm-utils.el ends here