+;; `interactive-p' is obsolete since Emacs 23.2.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)
+(put 'gmm-flet 'edebug-form-spec '((&rest (sexp sexp &rest form)) &rest form))
+
+(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)
+(put 'gmm-labels 'edebug-form-spec '((&rest (sexp sexp &rest form)) &rest form))
+
+(defun gmm-format-time-string (format-string &optional time tz)
+ "Use FORMAT-STRING to format the time TIME, or now if omitted.
+The optional TZ specifies the time zone in a number of seconds; any
+other non-nil value will be treated as 0. Note that both the format
+specifiers `%Z' and `%z' will be replaced with a numeric form. "
+;; FIXME: is there a smart way to replace %Z with a time zone name?
+ (if (and (numberp tz) (not (zerop tz)))
+ (let ((st 0)
+ (case-fold-search t)
+ ls nd rest)
+ (setq time (if time
+ (copy-sequence time)
+ (current-time)))
+ (if (>= (setq ls (- (cadr time) (car (current-time-zone)) (- tz))) 0)
+ (setcar (cdr time) ls)
+ (setcar (cdr time) (+ ls 65536))
+ (setcar time (1- (car time))))
+ (setq tz (format "%s%02d%02d"
+ (if (>= tz 0) "+" "-")
+ (/ (abs tz) 3600)
+ (/ (% (abs tz) 3600) 60)))
+ (while (string-match "%+z" format-string st)
+ (if (zerop (% (- (setq nd (match-end 0)) (match-beginning 0)) 2))
+ (progn
+ (push (substring format-string st (- nd 2)) rest)
+ (push tz rest))
+ (push (substring format-string st nd) rest))
+ (setq st nd))
+ (push (substring format-string st) rest)
+ (format-time-string (apply 'concat (nreverse rest)) time))
+ (format-time-string format-string time tz)))
+