(require 'cl)
(defmacro mh-require-cl ()
"Macro to load \"cl\" if needed.
Emacs coding conventions require that the \"cl\" package not be
required at runtime. However, the \"cl\" package in Emacs 21.4
and earlier left \"cl\" routines in their macro expansions. In
particular, the expansion of (setf (gethash ...) ...) used
functions in \"cl\" at run time. This macro recognizes that and
loads \"cl\" appropriately."
(if (eq (car (macroexpand '(setf (gethash foo bar) baz))) 'cl-puthash)
`(require 'cl)
`(eval-when-compile (require 'cl))))
(defmacro mh-do-in-gnu-emacs (&rest body)
"Execute BODY if in GNU Emacs."
(unless (featurep 'xemacs) `(progn ,@body)))
(put 'mh-do-in-gnu-emacs 'lisp-indent-hook 'defun)
(defmacro mh-do-in-xemacs (&rest body)
"Execute BODY if in XEmacs."
(when (featurep 'xemacs) `(progn ,@body)))
(put 'mh-do-in-xemacs 'lisp-indent-hook 'defun)
(defmacro mh-funcall-if-exists (function &rest args)
"Call FUNCTION with ARGS as parameters if it exists."
(when (fboundp function)
`(when (fboundp ',function)
(funcall ',function ,@args))))
(defmacro defun-mh (name function arg-list &rest body)
"Create function NAME.
If FUNCTION exists, then NAME becomes an alias for FUNCTION.
Otherwise, create function NAME with ARG-LIST and BODY."
(let ((defined-p (fboundp function)))
(if defined-p
`(defalias ',name ',function)
`(defun ,name ,arg-list ,@body))))
(put 'defun-mh 'lisp-indent-function 'defun)
(defmacro defmacro-mh (name macro arg-list &rest body)
"Create macro NAME.
If MACRO exists, then NAME becomes an alias for MACRO.
Otherwise, create macro NAME with ARG-LIST and BODY."
(let ((defined-p (fboundp macro)))
(if defined-p
`(defalias ',name ',macro)
`(defmacro ,name ,arg-list ,@body))))
(put 'defmacro-mh 'lisp-indent-function 'defun)
(defmacro mh-make-local-hook (hook)
"Make HOOK local if needed.
XEmacs and versions of GNU Emacs before 21.1 require
`make-local-hook' to be called."
(when (and (fboundp 'make-local-hook)
(not (get 'make-local-hook 'byte-obsolete-info)))
`(make-local-hook ,hook)))
(defmacro mh-mark-active-p (check-transient-mark-mode-flag)
"A macro that expands into appropriate code in XEmacs and nil in GNU Emacs.
In GNU Emacs if CHECK-TRANSIENT-MARK-MODE-FLAG is non-nil then
check if variable `transient-mark-mode' is active."
(cond ((featurep 'xemacs) `(and (boundp 'zmacs-regions) zmacs-regions (region-active-p)))
((not check-transient-mark-mode-flag) `(and (boundp 'mark-active) mark-active))
(t `(and (boundp 'transient-mark-mode) transient-mark-mode
(boundp 'mark-active) mark-active))))
(defvar struct) (defvar x) (defvar y)
(defmacro mh-defstruct (name-spec &rest fields)
"Replacement for `defstruct' from the \"cl\" package.
The `defstruct' in the \"cl\" library produces compiler warnings,
and generates code that uses functions present in \"cl\" at
run-time. This is a partial replacement, that avoids these
issues.
NAME-SPEC declares the name of the structure, while FIELDS
describes the various structure fields. Lookup `defstruct' for
more details."
(let* ((struct-name (if (atom name-spec) name-spec (car name-spec)))
(conc-name (or (and (consp name-spec)
(cadr (assoc :conc-name (cdr name-spec))))
(format "%s-" struct-name)))
(predicate (intern (format "%s-p" struct-name)))
(constructor (or (and (consp name-spec)
(cadr (assoc :constructor (cdr name-spec))))
(intern (format "make-%s" struct-name))))
(field-names (mapcar #'(lambda (x) (if (atom x) x (car x))) fields))
(field-init-forms (mapcar #'(lambda (x) (and (consp x) (cadr x)))
fields))
(struct (gensym "S"))
(x (gensym "X"))
(y (gensym "Y")))
`(progn
(defun* ,constructor (&key ,@(mapcar* #'(lambda (x y) (list x y))
field-names field-init-forms))
(list (quote ,struct-name) ,@field-names))
(defun ,predicate (arg)
(and (consp arg) (eq (car arg) (quote ,struct-name))))
,@(loop for x from 1
for y in field-names
collect `(defmacro ,(intern (format "%s%s" conc-name y)) (z)
(list 'nth ,x z)))
(quote ,struct-name))))
(defmacro with-mh-folder-updating (save-modification-flag &rest body)
"Format is (with-mh-folder-updating (SAVE-MODIFICATION-FLAG) &body BODY).
Execute BODY, which can modify the folder buffer without having to
worry about file locking or the read-only flag, and return its result.
If SAVE-MODIFICATION-FLAG is non-nil, the buffer's modification flag
is unchanged, otherwise it is cleared."
(setq save-modification-flag (car save-modification-flag)) `(prog1
(let ((mh-folder-updating-mod-flag (buffer-modified-p))
(buffer-read-only nil)
(buffer-file-name nil)) (prog1
(progn
,@body)
(mh-set-folder-modified-p mh-folder-updating-mod-flag)))
,@(if (not save-modification-flag)
'((mh-set-folder-modified-p nil)))))
(put 'with-mh-folder-updating 'lisp-indent-hook 'defun)
(defmacro mh-in-show-buffer (show-buffer &rest body)
"Format is (mh-in-show-buffer (SHOW-BUFFER) &body BODY).
Display buffer SHOW-BUFFER in other window and execute BODY in it.
Stronger than `save-excursion', weaker than `save-window-excursion'."
(setq show-buffer (car show-buffer)) `(let ((mh-in-show-buffer-saved-window (selected-window)))
(switch-to-buffer-other-window ,show-buffer)
(if mh-bury-show-buffer-flag (bury-buffer (current-buffer)))
(unwind-protect
(progn
,@body)
(select-window mh-in-show-buffer-saved-window))))
(put 'mh-in-show-buffer 'lisp-indent-hook 'defun)
(defmacro mh-do-at-event-location (event &rest body)
"Switch to the location of EVENT and execute BODY.
After BODY has been executed return to original window. The
modification flag of the buffer in the event window is
preserved."
(let ((event-window (make-symbol "event-window"))
(event-position (make-symbol "event-position"))
(original-window (make-symbol "original-window"))
(original-position (make-symbol "original-position"))
(modified-flag (make-symbol "modified-flag")))
`(save-excursion
(let* ((,event-window
(or (mh-funcall-if-exists posn-window (event-start ,event))
(mh-funcall-if-exists event-window ,event)))
(,event-position
(or (mh-funcall-if-exists posn-point (event-start ,event))
(mh-funcall-if-exists event-closest-point ,event)))
(,original-window (selected-window))
(,original-position (progn
(set-buffer (window-buffer ,event-window))
(set-marker (make-marker) (point))))
(,modified-flag (buffer-modified-p))
(buffer-read-only nil))
(unwind-protect (progn
(select-window ,event-window)
(goto-char ,event-position)
,@body)
(set-buffer-modified-p ,modified-flag)
(goto-char ,original-position)
(set-marker ,original-position nil)
(select-window ,original-window))))))
(put 'mh-do-at-event-location 'lisp-indent-hook 'defun)
(defmacro mh-seq-msgs (sequence)
"Extract messages from the given SEQUENCE."
(list 'cdr sequence))
(defmacro mh-iterate-on-messages-in-region (var begin end &rest body)
"Iterate over region.
VAR is bound to the message on the current line as we loop
starting from BEGIN till END. In each step BODY is executed.
If VAR is nil then the loop is executed without any binding."
(unless (symbolp var)
(error "Can not bind the non-symbol %s" var))
(let ((binding-needed-flag var))
`(save-excursion
(goto-char ,begin)
(beginning-of-line)
(while (and (<= (point) ,end) (not (eobp)))
(when (looking-at mh-scan-valid-regexp)
(let ,(if binding-needed-flag `((,var (mh-get-msg-num t))) ())
,@body))
(forward-line 1)))))
(put 'mh-iterate-on-messages-in-region 'lisp-indent-hook 'defun)
(defmacro mh-iterate-on-range (var range &rest body)
"Iterate an operation over a region or sequence.
VAR is bound to each message in turn in a loop over RANGE, which
can be a message number, a list of message numbers, a sequence, a
region in a cons cell, or a MH range (something like last:20) in
a string. In each iteration, BODY is executed.
The parameter RANGE is usually created with
`mh-interactive-range' in order to provide a uniform interface to
MH-E functions."
(unless (symbolp var)
(error "Can not bind the non-symbol %s" var))
(let ((binding-needed-flag var)
(msgs (make-symbol "msgs"))
(seq-hash-table (make-symbol "seq-hash-table")))
`(cond ((numberp ,range)
(when (mh-goto-msg ,range t t)
(let ,(if binding-needed-flag `((,var ,range)) ())
,@body)))
((and (consp ,range)
(numberp (car ,range)) (numberp (cdr ,range)))
(mh-iterate-on-messages-in-region ,var
(car ,range) (cdr ,range)
,@body))
(t (let ((,msgs (cond ((and ,range (symbolp ,range))
(mh-seq-to-msgs ,range))
((stringp ,range)
(mh-translate-range mh-current-folder
,range))
(t ,range)))
(,seq-hash-table (make-hash-table)))
(dolist (msg ,msgs)
(setf (gethash msg ,seq-hash-table) t))
(mh-iterate-on-messages-in-region v (point-min) (point-max)
(when (gethash v ,seq-hash-table)
(let ,(if binding-needed-flag `((,var v)) ())
,@body))))))))
(put 'mh-iterate-on-range 'lisp-indent-hook 'defun)
(provide 'mh-acros)