;;; mh-compat.el --- make MH-E compatible with various versions of Emacs
-;; Copyright (C) 2006-2014 Free Software Foundation, Inc.
+;; Copyright (C) 2006-2016 Free Software Foundation, Inc.
;; Author: Bill Wohler <wohler@newt.com>
;; Maintainer: Bill Wohler <wohler@newt.com>
'cancel-timer
'delete-itimer))
-;; Emacs 24 renamed flet to cl-flet.
-(defalias 'mh-cl-flet
- (if (fboundp 'cl-flet)
- 'cl-flet
- 'flet))
+;; Emacs 24 made flet obsolete and suggested either cl-flet or
+;; cl-letf. This macro is based upon gmm-flet from Gnus.
+(defmacro mh-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...)"
+ (if (fboundp 'cl-letf)
+ `(cl-letf ,(mapcar (lambda (binding)
+ `((symbol-function ',(car binding))
+ (lambda ,@(cdr binding))))
+ bindings)
+ ,@body)
+ `(flet ,bindings ,@body)))
+(put 'mh-flet 'lisp-indent-function 1)
+(put 'mh-flet 'edebug-form-spec
+ '((&rest (sexp sexp &rest form)) &rest form))
(defun mh-display-color-cells (&optional display)
"Return the number of color cells supported by DISPLAY.
(defmacro mh-display-completion-list (completions &optional common-substring)
"Display the list of COMPLETIONS.
See documentation for `display-completion-list' for a description of the
-arguments COMPLETIONS and perhaps COMMON-SUBSTRING.
-This macro is used by Emacs versions that lack a COMMON-SUBSTRING
-argument, introduced in Emacs 22."
- (if (< emacs-major-version 22)
- `(display-completion-list ,completions)
- `(display-completion-list ,completions ,common-substring)))
+arguments COMPLETIONS.
+The optional argument COMMON-SUBSTRING, if non-nil, should be a string
+specifying a common substring for adding the faces
+`completions-first-difference' and `completions-common-part' to
+the completions."
+ (cond ((< emacs-major-version 22) `(display-completion-list ,completions))
+ ((fboundp 'completion-hilit-commonality) ; Emacs 23.1 and later
+ `(display-completion-list
+ (completion-hilit-commonality ,completions
+ ,(length common-substring) nil)))
+ (t ; Emacs 22
+ `(display-completion-list ,completions ,common-substring))))
(defmacro mh-face-foreground (face &optional frame inherit)
"Return the foreground color name of FACE, or nil if unspecified.
(let* ((load-path (image-load-path-for-library \"mh-e\" \"mh-logo.xpm\"))
(image-load-path (cons (car load-path)
- (when (boundp 'image-load-path)
+ (when (boundp \\='image-load-path)
image-load-path))))
(mh-tool-bar-folder-buttons-init))"
(unless library (error "No library specified"))