-;; XXX: This should be a generic function in emacs somewhere, not
-;; here.
-(defun point-invisible-p ()
- "Return whether the character at point is invisible.
-
-Here visibility is determined by `buffer-invisibility-spec' and
-the invisible property of any overlays for point. It doesn't have
-anything to do with whether point is currently being displayed
-within the current window."
- (let ((prop (get-char-property (point) 'invisible)))
- (if (eq buffer-invisibility-spec t)
- prop
- (or (memq prop buffer-invisibility-spec)
- (assq prop buffer-invisibility-spec)))))
+(defun notmuch-remove-if-not (predicate list)
+ "Return a copy of LIST with all items not satisfying PREDICATE removed."
+ (let (out)
+ (while list
+ (when (funcall predicate (car list))
+ (push (car list) out))
+ (setq list (cdr list)))
+ (nreverse out)))
+
+; This lets us avoid compiling these replacement functions when emacs
+; is sufficiently new enough to supply them alone. We do the macro
+; treatment rather than just wrapping our defun calls in a when form
+; specifically so that the compiler never sees the code on new emacs,
+; (since the code is triggering warnings that we don't know how to get
+; rid of.
+;
+; A more clever macro here would accept a condition and a list of forms.
+(defmacro compile-on-emacs-prior-to-23 (form)
+ "Conditionally evaluate form only on emacs < emacs-23."
+ (list 'when (< emacs-major-version 23)
+ form))
+
+;; Compatibility functions for versions of emacs before emacs 23.
+;;
+;; Both functions here were copied from emacs 23 with the following copyright:
+;;
+;; Copyright (C) 1985, 1986, 1992, 1994, 1995, 1999, 2000, 2001, 2002, 2003,
+;; 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+;;
+;; and under the GPL version 3 (or later) exactly as notmuch itself.
+(compile-on-emacs-prior-to-23
+ (defun apply-partially (fun &rest args)
+ "Return a function that is a partial application of FUN to ARGS.
+ARGS is a list of the first N arguments to pass to FUN.
+The result is a new function which does the same as FUN, except that
+the first N arguments are fixed at the values with which this function
+was called."
+ (lexical-let ((fun fun) (args1 args))
+ (lambda (&rest args2) (apply fun (append args1 args2))))))
+
+(compile-on-emacs-prior-to-23
+ (defun mouse-event-p (object)
+ "Return non-nil if OBJECT is a mouse click event."
+ (memq (event-basic-type object) '(mouse-1 mouse-2 mouse-3 mouse-movement))))
+
+;; This variable is used only buffer local, but it needs to be
+;; declared globally first to avoid compiler warnings.
+(defvar notmuch-show-process-crypto nil)
+(make-variable-buffer-local 'notmuch-show-process-crypto)