GNU bug report logs - #23730
24.5; format removes text properties

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: ynyaaa <at> gmail.com
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; format removes text properties
Date: Wed, 08 Jun 2016 22:41:46 +0900

`format' may remove text properties.
Second form is an example.

(format (propertize "%d" 'face '(:background "red")) 1)
=>#("1" 0 1 (face (:background "red")))

(format (propertize "%2d" 'face '(:background "red")) 1)
=>" 1"

(format (propertize "%02d" 'face '(:background "red")) 1)
=>#("01" 0 2 (face (:background "red")))




In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.0.6002
Configured using:
 `configure --prefix=/c/usr --host=i686-pc-mingw32'

Important settings:
  value of $LANG: JPN
  locale-coding-system: cp932

Major mode: Lisp Interaction

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  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
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  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

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Memory information:
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 (symbols 32 17447 0)
 (miscs 32 38 127)
 (strings 16 10667 4075)
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Message #8 received at 23730 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: ynyaaa <at> gmail.com
Cc: 23730 <at> debbugs.gnu.org
Subject: Re: bug#23730: 24.5; format removes text properties
Date: Wed, 08 Jun 2016 19:57:10 +0300

> From: ynyaaa <at> gmail.com
> Date: Wed, 08 Jun 2016 22:41:46 +0900
> 
> 
> `format' may remove text properties.
> Second form is an example.
> 
> (format (propertize "%d" 'face '(:background "red")) 1)
> =>#("1" 0 1 (face (:background "red")))
> 
> (format (propertize "%2d" 'face '(:background "red")) 1)
> =>" 1"
> 
> (format (propertize "%02d" 'face '(:background "red")) 1)
> =>#("01" 0 2 (face (:background "red")))

Why did you expect the properties of the format specifier to be
preserved?  The documentation only promises that the characters
_other_ than the format specifier are copied with their properties,
but makes no such promises about the specifier.

IOW, this is the intended behavior.  If you want the result of the
conversion to have some properties, you should propertize the return
value.

Message #15 received at 23730 <at> debbugs.gnu.org (full text, mbox):

From: ynyaaa <at> gmail.com
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 23730 <at> debbugs.gnu.org
Subject: Re: bug#23730: 24.5; format removes text properties
Date: Thu, 09 Jun 2016 11:07:01 +0900

Eli Zaretskii <eliz <at> gnu.org> writes:

>The documentation only promises that the characters
>_other_ than the format specifier are copied with their properties,

Text properties after the format spericifier are copied
with wrong positions.

(format (concat (propertize "%2d" 'x 'X)
                (propertize "a" 'a 'A)
                (propertize "b" 'b 'B))
        1)
=>#(" 1ab" 0 1 (a A) 1 2 (b B))

Message #18 received at 23730-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: ynyaaa <at> gmail.com
Cc: 23730-done <at> debbugs.gnu.org
Subject: Re: bug#23730: 24.5; format removes text properties
Date: Thu, 09 Jun 2016 16:54:50 +0300

> From: ynyaaa <at> gmail.com
> Cc: 23730 <at> debbugs.gnu.org
> Date: Thu, 09 Jun 2016 11:07:01 +0900
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >The documentation only promises that the characters
> >_other_ than the format specifier are copied with their properties,
> 
> Text properties after the format spericifier are copied
> with wrong positions.
> 
> (format (concat (propertize "%2d" 'x 'X)
>                 (propertize "a" 'a 'A)
>                 (propertize "b" 'b 'B))
>         1)
> =>#(" 1ab" 0 1 (a A) 1 2 (b B))

Fixed on the master branch, thanks.  Fixing this also corrected your
originally reported issue, so I made it clear in the documentation
that the text properties from the format specifiers are also copied.

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