C-/ and C-( not recognized in Terminal on Mac?

C-/ and C-( not recognized in Terminal on Mac?

[Presto]

On a Mac, after opening the Terminal application and launching Emacs,
entering the keystroke "C-/" (mapped to undo) gives a system alert
indicating the keystroke was not recognized. Trying the Emacs function
"describe-key" with "C-/" to check what Emacs is receiving reveals
that Emacs seems to not be receiving anything at all.  Why is the
keystroke "C-/" not being passed through to Emacs?

Another keystroke not passed through seems to be "C-(". Both of the
mentioned keystrokes are important to me and I would like to use them
in Emacs in Terminal. I noticed some other keystrokes involving the
Control modifier _are_ passed through: "C-_" and "C-@" for example. Is
this a terminal issue? Is it possible to make the Mac Terminal pass
"C-/" and "C-(" through to Emacs?

Re: C-/ and C-( not recognized in Terminal on Mac?

[Peter Dyballa]

Am 30.11.2007 um 00:34 schrieb Presto:

> Is this a terminal issue?

Yes.

> Is it possible to make the Mac Terminal pass
> "C-/" and "C-(" through to Emacs?

Try Apple Bug Reporter: https://bugreport.apple.com/cgi-bin/ 
WebObjects/RadarWeb.woa

--
Greetings

   Pete

Bake pizza not war!

Re: C-/ and C-( not recognized in Terminal on Mac?

[Peter Dyballa]

Am 30.11.2007 um 01:11 schrieb prestowk:

>
> On 30 Nov 2007, at 03:04, prestowk wrote:
>
>> On 30 Nov 2007, at 02:51, Peter Dyballa wrote:
>>>
>
>>> Try Apple Bug Reporter: https://bugreport.apple.com/cgi-bin/ 
>>> WebObjects/RadarWeb.woa
>>
>> I will do that. However, do you have any information that would be  
>> useful to add in the report, such as a motivation why the current  
>> behavior should be fixed? Is Terminal's behavior just plain wrong,  
>> or have they made a political decision/interpretation of some  
>> standard? I hope making the report as technically informative and  
>> convincing as possible increases the chance of this getting fixed.
>
> Addition: For example, is there a standard/specification that I  
> could refer to that says (or at least does not prohibit) that  
> functionality? Maybe VT100 or something like that. Also, are there  
> other terminal emulators in which this works that I could compare  
> with? You seem to be sure of the nature of this issue, so I'm  
> asking for whatever useful information you might have.


I never investigated which terminal emulation works better, I simply  
accepted the fact that terminal emulations do not support or allow  
all possible control-<some keyboard key> combinations – maybe it's  
because in ASCII there are just 32 control characters defined? I  
always thought I am more clever and use GNU Emacs as X client – where  
a lot more synthetic keyboard key events are possible.

--
Greetings

   Pete

In a world without walls and fences, who needs gates and windows?

Re: C-/ and C-( not recognized in Terminal on Mac?

[Enno Fennema]

Peter Dyballa wrote:
> Am 30.11.2007 um 01:11 schrieb prestowk:
>> On 30 Nov 2007, at 03:04, prestowk wrote:

>> Addition: For example, is there a standard/specification that I  could 
>> refer to that says (or at least does not prohibit) that  
>> functionality? Maybe VT100 or something like that. Also, are there  
>> other terminal emulators in which this works that I could compare  
>> with? You seem to be sure of the nature of this issue, so I'm  asking 
>> for whatever useful information you might have.

I thought the fun of emulation is to emulate something, to do neither 
more nor less. I don't know when the last VT100 was manufactured but its 
specification is no longer capable of change. The termcap file is quite 
specific what a terminal eg. a VT100 can and cannot do.

Enno Fennema

Re: C-/ and C-( not recognized in Terminal on Mac?

[David Brodbeck]

[-- Attachment #1.1: Type: text/plain, Size: 1098 bytes --]


On Nov 30, 2007, at 7:38 AM, Enno Fennema wrote:
> I thought the fun of emulation is to emulate something, to do  
> neither more nor less. I don't know when the last VT100 was  
> manufactured but its specification is no longer capable of change.  
> The termcap file is quite specific what a terminal eg. a VT100 can  
> and cannot do.

I don't think there are many terminal emulators left that emulate a  
VT-100 strictly.  Most add some features a VT-100 didn't have (e.g.,  
ANSI color, Unicode) and leave out some stuff that is rarely used or  
hard to implement (double-height mode, application-controlled  
keyboard LEDs, 132-column mode, etc.)  Generally they're actually  
"emulating" some cross between a VT-100 and an ANSI terminal, or a  
VT-100 and an xterm.

Actually, the most thorough VT-100 emulator I can remember ever using  
was the old MacOS serial terminal program Red Ryder.  It *did*  
emulate double-height mode and keyboard LEDs, the latter via a pop-up  
window.


David Brodbeck
Information Technology Specialist 3
Computational Linguistics
University of Washington



[-- Attachment #1.2: Type: text/html, Size: 2522 bytes --]

[-- Attachment #2: Type: text/plain, Size: 152 bytes --]

_______________________________________________
help-gnu-emacs mailing list
help-gnu-emacs@gnu.org
http://lists.gnu.org/mailman/listinfo/help-gnu-emacs