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Date: Mon, 8 Oct 2012 12:54:57 +0100
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Subject: Re: RFE: make non-x11 emacs mouse-aware
From: Andy Koppe <andy DOT koppe AT gmail DOT com>
To: cygwin AT cygwin DOT com
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On 8 October 2012 11:59, Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca> wrote:
> On 07/10/2012 11:37 AM, Ken Brown wrote:
>>
>> On 10/1/2012 5:54 PM, Ken Brown wrote:
>>>
>>> On 10/1/2012 4:29 PM, Ryan Johnson wrote:
>>>>
>>>> On 01/10/2012 3:20 PM, Ken Brown wrote:
>>>>>
>>>>> On 10/1/2012 2:49 PM, Ryan Johnson wrote:
>>>>>>
>>>>>> Hi all, esp. emacs maintainer(s),
>>>>>>
>>>>>> I'd like to request that the non-x11 emacs be made mouse aware. Right
>>>>>> now, terminal mouse mode is broken in normal emacs because the emacs
>>>>>> core doesn't recognize the resulting mouse events. You can use
>>>>>> emacs-x11
>>>>>> in terminal mode as a heavyweight workaround, but it turns out that
>>>>>> mouse awareness is controlled by the src/config.h file created by
>>>>>> ./configure:
>>>>>>>
>>>>>>> /* Define if you have mouse support. */
>>>>>>> /* #undef HAVE_MOUSE */
>>>>>>
>>>>>>
>>>>>> There doesn't seem to be an explicit configure switch for it (it's
>>>>>> enabled indirectly by --with-x11 or --with-ns), but editing directly
>>>>>> produced the desired results on a headless linux machine, with no
>>>>>> undesirable side effects so far. I see no reason it shouldn't also
>>>>>> work
>>>>>> under cygwin.
>>>>>
>>>>>
>>>>> I'd be happy to do it if I could be sure there were no bad side
>>>>> effects.  But I never use emacs-nox, so it isn't easy for me to test
>>>>> it on a long-term basis.  Maybe you should build it yourself and
>>>>> report back.
>>>>
>>>> As noted, I have tested on a headless linux machine, with no problems so
>>>> far (several days). There seems to be a clean division between the
>>>> window management and the mouse handling code. This makes sense, because
>>>> the mouse events themselves are handled by keymaps and such, in elisp
>>>> land, while the generation of those events is deeper and varies
>>>> depending on their source (X11, NS, terminal).
>>>>
>>>> If you worry that cygwin might behave differently than linux, I could
>>>> build emacs locally and test as well, but I don't expect any difference.
>>>>
>>>>> And can you be more specific about what you expect emacs to do with
>>>>> mouse events when it's running in a terminal?  I thought mintty
>>>>> captured mouse events.  In particular, when I run emacs-x11 under
>>>>> mintty, C-h k <mouse-click> produces no response; the cursor stays in
>>>>> the minibuffer, and emacs continues to wait for me to press a key.
>>>>> Running under X, however, emacs does see the mouse click in that same
>>>>> situation.  For another example, if I run emacs-x11 under mintty, I
>>>>> can highlight text with the mouse and then paste it with
>>>>> shift-insert.  But again it's mintty doing the work, not emacs.
>>>>
>>>> On any emacs, xterm-mouse-mode puts the terminal in mouse-reporting mode
>>>> and starts watching stdin for the xterm mouse escape sequences: left,
>>>> right, scroll, modifier keys, anything the terminal makes available
>>>> (most xterm-like terminals intercept shift + mouse, for example). You
>>>> can peek in xt-mouse.el to see how mouse escapes are turned into
>>>> appropriate mouse events, but that's not really important here. The
>>>> issue is that emacs-nox doesn't know what to do with '<mouse-1>' etc
>>>> that it suddenly starts receiving. I suppose you could manually wire up
>>>> all the various events by hand, but on emacs-x11 they're already there
>>>> (even in terminal mode) and terminal-generated mouse events work out of
>>>> the box.
>>>
>>>
>>> I didn't know about xterm-mouse-mode.
>>>
>>> OK, I've built emacs-nox with mouse support, and it works, as far as I
>>> can tell.  I'll upload it as a test release after I've tested it a
>>> little more.
>>
>>
>> Before going ahead with this, I decided to ask for comments on the
>> emacs-devel list, to make sure no one could see a downside.  This led to a
>> question about your tests on Linux.  The default on Linux is to provide
>> mouse support in a terminal via GPM (which is not available on Cygwin).  Did
>> you explicitly disable GPM when you built emacs for Linux?  If not, then
>> your tests may not be an accurate indication of what will happen on Cygwin.
>
> I'm sorry, my test machine was actually running Solaris, so GPM was
> definitely disabled... mixed up which VM guest on my laptop I was using,
> sorry. I redid the tests with a non-VM Ubuntu 11 machine, and AFAICT GPM is
> *not* the default, at least with emacs-24.2. Neither HAVE_GPM nor HAVE_MOUSE
> was defined, and (unsurprisingly) mouse clicks under xterm-mouse-mode mouse
> give the error: "<mouse-1> is undefined." Manually defining HAVE_MOUSE and
> recompiling fixed the problem.
>
> In any case, I thought GPM was only useful in console mode?

Apparently the gpm client library can not only connect to a gpm server
handling mouse events in a Linux console, but it can also translate
xterm mouse events, and present the same API with both approaches.
Alas, there's no gpm client library package for Cygwin, and I don't
know whether it can be built for Cygwin.

Andy

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