bug#28746: 27.0.50; cc-mode should automatically detect Objective-C headers

bug#28746: 27.0.50; cc-mode should automatically detect Objective-C headers

[Philipp]

Visit a file with a file name extension of .h and the following
contents:

@interface foo {
}
- (void)method;
@end

The buffer will be in c-mode, not objc-mode.  CC-Mode should
automatically detect that this is an Objective-C header and switch to
objc-mode.  Probably searching for @interface or @implementation should
cover most cases.


In GNU Emacs 27.0.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2017-10-08 built on localhost
Repository revision: 9b3ce6252115980802adaa562af575bcd73a2c55
Windowing system distributor 'The X.Org Foundation', version 11.0.11803000
System Description:	Ubuntu 14.04.5 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-gtk-deprecation-warnings --with-modules
 --without-pop --with-mailutils --enable-checking
 --enable-check-lisp-object-type --enable-gcc-warnings 'CFLAGS=-ggdb3
 -O0''

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
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cl-preloaded nadvice loaddefs button faces cus-face macroexp files
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custom widget hashtable-print-readable backquote inotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 94525 13775)
 (symbols 48 20163 1)
 (miscs 40 39 170)
 (strings 32 28082 1740)
 (string-bytes 1 728996)
 (vectors 16 13949)
 (vector-slots 8 488053 13844)
 (floats 8 49 68)
 (intervals 56 214 0)
 (buffers 992 12)
 (heap 1024 28679 1010))

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bug#28746: 27.0.50; cc-mode should automatically detect Objective-C headers

[Philipp Stephani]

[-- Attachment #1: Type: text/plain, Size: 617 bytes --]

Philipp <p.stephani2@gmail.com> schrieb am So., 8. Okt. 2017 um 16:16 Uhr:

>
> Visit a file with a file name extension of .h and the following
> contents:
>
> @interface foo {
> }
> - (void)method;
> @end
>
> The buffer will be in c-mode, not objc-mode.  CC-Mode should
> automatically detect that this is an Objective-C header and switch to
> objc-mode.  Probably searching for @interface or @implementation should
> cover most cases.
>

It seems like CC-Mode is already doing something similar with
`c-or-c++-mode'. Probably that functionality should be extended to cover
Objective-C (and Objective-C++?) as well.

[-- Attachment #2: Type: text/html, Size: 939 bytes --]

bug#28746: 27.0.50; cc-mode should automatically detect Objective-C headers

[Lars Ingebrigtsen]

Philipp Stephani <p.stephani2@gmail.com> writes:

> Philipp <p.stephani2@gmail.com> schrieb am So., 8. Okt. 2017 um 16:16 Uhr:
>
>  Visit a file with a file name extension of .h and the following
>  contents:
>
>  @interface foo {
>  }
>  - (void)method;
>  @end
>
>  The buffer will be in c-mode, not objc-mode.

This is still the case in Emacs 28, as far as I can tell.

>  CC-Mode should automatically detect that this is an Objective-C
>  header and switch to objc-mode.  Probably searching for @interface or
>  @implementation should cover most cases.
>
> It seems like CC-Mode is already doing something similar with `c-or-c++-mode'.
> Probably that functionality should be extended to cover Objective-C (and
> Objective-C++?) as well. 

Sounds reasonable to me.  I've added Alan to the CCs.

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