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Subject: bug#26169: 25.1; ses.el string cell recalculate message
Resent-From: Kevin Ryde <user42_kevin@HIDDEN>
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Date: Sun, 19 Mar 2017 16:02:01 +1100
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In debian packaged emacs 25.1.1, starting "emacs -Q /tmp/foo.ses"

   " Ret            # create a cell with a string
   hello Ret        # the string content
   C-p              # move point to that cell
   c                # ses-recalculate-cell
   =>
   Format specifier doesn't match argument type: A1

I expected recalc on a string cell to leave it unchanged.
The message looks like a caught error, but I don't know if it's
something bad or merely unsightly.  The same happens in emacs 24.

Occasionally I've had c on a string cell clear it to nil.  I'll see if I
can make something reproducable for that, if it could be related.

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To: Kevin Ryde <user42_kevin@HIDDEN>
Subject: bug#26169: Acknowledgement (25.1; ses.el string cell recalculate
 message)
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Subject: bug#26169: 25.1; ses.el string cell recalculate message
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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To: Kevin Ryde <user42_kevin@HIDDEN>
Cc: Vincent =?UTF-8?Q?Bela=C3=AFche?= <vincentb1@HIDDEN>, 26169 <at> debbugs.gnu.org
From: Lars Ingebrigtsen <larsi@HIDDEN>
References: <87bmsx6era.fsf@HIDDEN>
Date: Thu, 20 Aug 2020 18:22:11 +0200
In-Reply-To: <87bmsx6era.fsf@HIDDEN> (Kevin Ryde's message of "Sun, 19 Mar
 2017 16:02:01 +1100")
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Kevin Ryde <user42_kevin@HIDDEN> writes:

> In debian packaged emacs 25.1.1, starting "emacs -Q /tmp/foo.ses"
>
>    " Ret            # create a cell with a string
>    hello Ret        # the string content
>    C-p              # move point to that cell
>    c                # ses-recalculate-cell
>    =>
>    Format specifier doesn't match argument type: A1
>
> I expected recalc on a string cell to leave it unchanged.
> The message looks like a caught error, but I don't know if it's
> something bad or merely unsightly.  The same happens in emacs 24.
>
> Occasionally I've had c on a string cell clear it to nil.  I'll see if I
> can make something reproducable for that, if it could be related.

I had a peek at ses.el (a package I don't use regularly), and something
like the following fixes the problem, but is probably totally the wrong
solution.

I've Cc'd the maintainer on this -- Vincent?

diff --git a/lisp/ses.el b/lisp/ses.el
index 96b219fc60..e396cc72ac 100644
--- a/lisp/ses.el
+++ b/lisp/ses.el
@@ -1231,7 +1231,9 @@ ses-print-cell
                     (ses--col col))
                 (ses-call-printer (or printer
                                       (ses-col-printer col)
-                                      ses--default-printer)
+                                      (if (stringp value)
+                                          "%7s"
+                                        ses--default-printer))
                                   value)))
 	(if (consp ses-call-printer-return)
 	    ;; Printer returned an error.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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Subject: bug#26169: 25.1; ses.el string cell recalculate message
Resent-From: Vincent =?UTF-8?Q?Bela=C3=AFche?= <vincent.belaiche@HIDDEN>
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From: Vincent =?UTF-8?Q?Bela=C3=AFche?= <vincent.belaiche@HIDDEN>
Date: Mon, 24 Aug 2020 16:20:17 +0200
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Hello Lars,

The root cause is that the default printer is "%.7g". This printer
being a string it is equivalent for (lambda (x) (format xxxx x)),
where xxxx is the concerned string, ie "%.7g".

That default printer comes from the const ses-initial-file-contents,
which hard wires the default printer to "%.7g".

So you can just change your spreadsheet not to get the error by
setting "%s" as a printer to cell A1 (just press p, then "%s", and
then RET). You can also change the default column printer with M-p, or
the default spreadsheet printer with C-c C-p.

A better fix would certainly to accept a new printer format that
instead of a string would be some sort of expression structure that
would map a format string to some predicate, where the predicates
could only be one of stringp , numberp. It could be something

'(printers (stringp . "%s") (numberp . "%.7g"))

So the code would check it for being safe (not to allow viruses on
load) this way

(mapc (lambda (x) (or (and (memq (car x) '(stringp numberp)) (stringp
(cdr x)) (errror "Unsafe printer %S" x))
   yyyy)

where yyyy would be the desired value '(printers (stringp . "%s")
(numberp . "%.7g")).

Well, probably what sort of structure we want to accommodate needs
some more thinking.

  Vincent.

PS : I cannot make the fix straight away, my personal PC ethernet card
has been broken by the latest storm overvoltage, and the other PC
having my credentials is also under repair after overheating damaged
the connectors (well, nothing surprising as this was a MACbook pro, a
notable unreliable sort of machine wrt to thermal extreme conditions).

Le jeu. 20 ao=C3=BBt 2020 =C3=A0 18:22, Lars Ingebrigtsen <larsi@HIDDEN> =
a =C3=A9crit :
>
> Kevin Ryde <user42_kevin@HIDDEN> writes:
>
> > In debian packaged emacs 25.1.1, starting "emacs -Q /tmp/foo.ses"
> >
> >    " Ret            # create a cell with a string
> >    hello Ret        # the string content
> >    C-p              # move point to that cell
> >    c                # ses-recalculate-cell
> >    =3D>
> >    Format specifier doesn't match argument type: A1
> >
> > I expected recalc on a string cell to leave it unchanged.
> > The message looks like a caught error, but I don't know if it's
> > something bad or merely unsightly.  The same happens in emacs 24.
> >
> > Occasionally I've had c on a string cell clear it to nil.  I'll see if =
I
> > can make something reproducable for that, if it could be related.
>
> I had a peek at ses.el (a package I don't use regularly), and something
> like the following fixes the problem, but is probably totally the wrong
> solution.
>
> I've Cc'd the maintainer on this -- Vincent?
>
> diff --git a/lisp/ses.el b/lisp/ses.el
> index 96b219fc60..e396cc72ac 100644
> --- a/lisp/ses.el
> +++ b/lisp/ses.el
> @@ -1231,7 +1231,9 @@ ses-print-cell
>                      (ses--col col))
>                  (ses-call-printer (or printer
>                                        (ses-col-printer col)
> -                                      ses--default-printer)
> +                                      (if (stringp value)
> +                                          "%7s"
> +                                        ses--default-printer))
>                                    value)))
>         (if (consp ses-call-printer-return)
>             ;; Printer returned an error.
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no

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From: Vincent =?UTF-8?Q?Bela=C3=AFche?= <vincent.belaiche@HIDDEN>
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Or we could have some extended format string, like this:

"%?n{%.7g%}%?s{%s%}%?*{%S%}"

where whatever is between %?xxxx{ and %} is conditioned by some
predicate xxxx that can be n for numberp, s for stringp, and * for
"none of those at the same level", and some parser would compile this
format string into

(cond
   ((numberp x) (format "%.7g" x))
   ((stringp x) (format "%s" x))
   (t (format "%S" x))

Le lun. 24 ao=C3=BBt 2020 =C3=A0 16:20, Vincent Bela=C3=AFche
<vincent.belaiche@HIDDEN> a =C3=A9crit :
>
> Hello Lars,
>
> The root cause is that the default printer is "%.7g". This printer
> being a string it is equivalent for (lambda (x) (format xxxx x)),
> where xxxx is the concerned string, ie "%.7g".
>
> That default printer comes from the const ses-initial-file-contents,
> which hard wires the default printer to "%.7g".
>
> So you can just change your spreadsheet not to get the error by
> setting "%s" as a printer to cell A1 (just press p, then "%s", and
> then RET). You can also change the default column printer with M-p, or
> the default spreadsheet printer with C-c C-p.
>
> A better fix would certainly to accept a new printer format that
> instead of a string would be some sort of expression structure that
> would map a format string to some predicate, where the predicates
> could only be one of stringp , numberp. It could be something
>
> '(printers (stringp . "%s") (numberp . "%.7g"))
>
> So the code would check it for being safe (not to allow viruses on
> load) this way
>
> (mapc (lambda (x) (or (and (memq (car x) '(stringp numberp)) (stringp
> (cdr x)) (errror "Unsafe printer %S" x))
>    yyyy)
>
> where yyyy would be the desired value '(printers (stringp . "%s")
> (numberp . "%.7g")).
>
> Well, probably what sort of structure we want to accommodate needs
> some more thinking.
>
>   Vincent.
>
> PS : I cannot make the fix straight away, my personal PC ethernet card
> has been broken by the latest storm overvoltage, and the other PC
> having my credentials is also under repair after overheating damaged
> the connectors (well, nothing surprising as this was a MACbook pro, a
> notable unreliable sort of machine wrt to thermal extreme conditions).
>
> Le jeu. 20 ao=C3=BBt 2020 =C3=A0 18:22, Lars Ingebrigtsen <larsi@HIDDEN=
> a =C3=A9crit :
> >
> > Kevin Ryde <user42_kevin@HIDDEN> writes:
> >
> > > In debian packaged emacs 25.1.1, starting "emacs -Q /tmp/foo.ses"
> > >
> > >    " Ret            # create a cell with a string
> > >    hello Ret        # the string content
> > >    C-p              # move point to that cell
> > >    c                # ses-recalculate-cell
> > >    =3D>
> > >    Format specifier doesn't match argument type: A1
> > >
> > > I expected recalc on a string cell to leave it unchanged.
> > > The message looks like a caught error, but I don't know if it's
> > > something bad or merely unsightly.  The same happens in emacs 24.
> > >
> > > Occasionally I've had c on a string cell clear it to nil.  I'll see i=
f I
> > > can make something reproducable for that, if it could be related.
> >
> > I had a peek at ses.el (a package I don't use regularly), and something
> > like the following fixes the problem, but is probably totally the wrong
> > solution.
> >
> > I've Cc'd the maintainer on this -- Vincent?
> >
> > diff --git a/lisp/ses.el b/lisp/ses.el
> > index 96b219fc60..e396cc72ac 100644
> > --- a/lisp/ses.el
> > +++ b/lisp/ses.el
> > @@ -1231,7 +1231,9 @@ ses-print-cell
> >                      (ses--col col))
> >                  (ses-call-printer (or printer
> >                                        (ses-col-printer col)
> > -                                      ses--default-printer)
> > +                                      (if (stringp value)
> > +                                          "%7s"
> > +                                        ses--default-printer))
> >                                    value)))
> >         (if (consp ses-call-printer-return)
> >             ;; Printer returned an error.
> >
> > --
> > (domestic pets only, the antidote for overdose, milk.)
> >    bloggy blog: http://lars.ingebrigtsen.no

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