--- Begin Message ---
|
Subject: |
25.0.50; mh-e: wrong usage of cl-flet |
|
Date: |
Wed, 06 Jan 2016 10:01:23 +0900 |
|
User-agent: |
Gnus/5.130014 (真 Gnus v0.14) Emacs/25.0.50 (i686-pc-cygwin) |
Hi,
mh-e uses Gnus functions to render MIME messages and uses the
mh-cl-flet macro to modify some of them. Currently mh-e always
loads cl (see mh-acros.el), so both cl-flet and flet are available
and mh-cl-flet will become cl-flet:
,----
| ;; Emacs 24 renamed flet to cl-flet.
| (defalias 'mh-cl-flet
| (if (fboundp 'cl-flet)
| 'cl-flet
| 'flet))
`----
However, cl-flet is quite unlike flet, IIUC. For instance, if
cl-flet is used, the mh-cl-flet code in mh-display-emphasis
,----
| ;; (defun mh-display-emphasis ()
| ;; "Display graphical emphasis."
| ;; (when (and mh-graphical-emphasis-flag (mh-small-show-buffer-p))
| (mh-cl-flet
| ((article-goto-body ())) ; shadow this function to do nothing
| (save-excursion
| (goto-char (point-min))
| (article-emphasize)))
| ;; ))
`----
will be expanded to
,----
| (progn
| (save-excursion
| (goto-char (point-min))
| (article-emphasize)))
`----
whereas if flet is used, it will be expanded to:
,----
| (let* ((vnew (cl-function (lambda nil
| (cl-block article-goto-body))))
| (old (symbol-function 'article-goto-body)))
| (unwind-protect
| (progn
| (fset 'article-goto-body vnew)
| (save-excursion
| (goto-char (point-min))
| (article-emphasize)))
| (fset 'article-goto-body old)))
`----
Note that the former doesn't achieve the original target, i.e.,
article-goto-body is not modified while running article-emphasize.
I don't know how it damages the behavior of mh-e, but I think it
should be fixed anyway. If mh-e keeps loading cl as ever,
mh-cl-flet can be:
(defalias 'mh-cl-flet 'flet)
Otherwise use this complete Emacs-Lisp style flet emulation macro
(a copy of gmm-flet that exists in only the Gnus git master):
--8<---------------cut here---------------start------------->8---
(defmacro mh-cl-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 'mh-cl-flet 'lisp-indent-function 1)
(put 'mh-cl-flet 'edebug-form-spec
'((&rest (sexp sexp &rest form)) &rest form))
--8<---------------cut here---------------end--------------->8---
I'm not the right person to install it since I'm not a mh-e user,
sorry.
Regards,
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#22317: 25.0.50; mh-e: wrong usage of cl-flet |
|
Date: |
Mon, 30 May 2016 17:18:14 -0700 |
Fixed and committed to emacs-25 release branch:
commit 0992ec3b0bfaf98edce1d08462e9ec8e11d6b6e6
Author: Bill Wohler <address@hidden>
Date: Mon May 30 16:49:37 2016 -0700
Correct cl-flet usage (Bug#22317)
* mh-compat.el: Rename mh-cl-flet to mh-flet and convert alias to
macro using patch from Katsumi Yamaoka <address@hidden>.
* mh-thread.el (mh-thread-set-tables):
* mh-show.el (mh-gnus-article-highlight-citation):
* mh-mime.el (mh-display-with-external-viewer):
(mh-mime-display, mh-press-button, mh-push-button):
(mh-display-emphasis): Call mh-flet instead of mh-cl-flet.
Glenn Morris <address@hidden> wrote:
> mh-e-devel, FYI:
>
> http://debbugs.gnu.org/22317
>
> Katsumi Yamaoka wrote:
>
> > Hi,
> >
> > mh-e uses Gnus functions to render MIME messages and uses the
> > mh-cl-flet macro to modify some of them. Currently mh-e always
> > loads cl (see mh-acros.el), so both cl-flet and flet are available
> > and mh-cl-flet will become cl-flet:
> > ,----
> > | ;; Emacs 24 renamed flet to cl-flet.
> > | (defalias 'mh-cl-flet
> > | (if (fboundp 'cl-flet)
> > | 'cl-flet
> > | 'flet))
> > `----
> > However, cl-flet is quite unlike flet, IIUC. For instance, if
> > cl-flet is used, the mh-cl-flet code in mh-display-emphasis
> > ,----
> > | ;; (defun mh-display-emphasis ()
> > | ;; "Display graphical emphasis."
> > | ;; (when (and mh-graphical-emphasis-flag (mh-small-show-buffer-p))
> > | (mh-cl-flet
> > | ((article-goto-body ())) ; shadow this function to do nothing
> > | (save-excursion
> > | (goto-char (point-min))
> > | (article-emphasize)))
> > | ;; ))
> > `----
> > will be expanded to
> > ,----
> > | (progn
> > | (save-excursion
> > | (goto-char (point-min))
> > | (article-emphasize)))
> > `----
> > whereas if flet is used, it will be expanded to:
> > ,----
> > | (let* ((vnew (cl-function (lambda nil
> > | (cl-block article-goto-body))))
> > | (old (symbol-function 'article-goto-body)))
> > | (unwind-protect
> > | (progn
> > | (fset 'article-goto-body vnew)
> > | (save-excursion
> > | (goto-char (point-min))
> > | (article-emphasize)))
> > | (fset 'article-goto-body old)))
> > `----
> > Note that the former doesn't achieve the original target, i.e.,
> > article-goto-body is not modified while running article-emphasize.
> >
> > I don't know how it damages the behavior of mh-e, but I think it
> > should be fixed anyway. If mh-e keeps loading cl as ever,
> > mh-cl-flet can be:
> >
> > (defalias 'mh-cl-flet 'flet)
> >
> > Otherwise use this complete Emacs-Lisp style flet emulation macro
> > (a copy of gmm-flet that exists in only the Gnus git master):
> >
> > --8<---------------cut here---------------start------------->8---
> > (defmacro mh-cl-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 'mh-cl-flet 'lisp-indent-function 1)
> > (put 'mh-cl-flet 'edebug-form-spec
> > '((&rest (sexp sexp &rest form)) &rest form))
> > --8<---------------cut here---------------end--------------->8---
> >
> > I'm not the right person to install it since I'm not a mh-e user,
> > sorry.
> >
> > Regards,
>
>
>
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--
Bill Wohler <address@hidden> aka <address@hidden>
http://www.newt.com/wohler/
GnuPG ID:610BD9AD
--- End Message ---