* Functions that need X @ 2011-01-01 19:35 Cecil Westerhof 2011-01-01 21:32 ` Barry Margolin ` (2 more replies) 0 siblings, 3 replies; 11+ messages in thread From: Cecil Westerhof @ 2011-01-01 19:35 UTC (permalink / raw To: help-gnu-emacs I have a lot of functionality written for my Emacs. I was asked to maintain a server for a friend. I installed Emacs there and put my Emacs functionality there also. But some things are depending on X. Because of this I made those depended working with X. In the start of my .emacs I have: (defconst +using-X+ (getenv "DISPLAY")) And where I use X-functionality (not much at the moment) I have: (unless (not +using-X+) (set-scroll-bar-mode 'right) (tool-bar-mode -1)) -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 19:35 Functions that need X Cecil Westerhof @ 2011-01-01 21:32 ` Barry Margolin 2011-01-01 21:58 ` Tim X 2011-01-11 0:24 ` Kevin Rodgers 2 siblings, 0 replies; 11+ messages in thread From: Barry Margolin @ 2011-01-01 21:32 UTC (permalink / raw To: help-gnu-emacs In article <87sjxcv2ld.fsf@Compaq.site>, Cecil Westerhof <Cecil@decebal.nl> wrote: > I have a lot of functionality written for my Emacs. I was asked to > maintain a server for a friend. I installed Emacs there and put my > Emacs functionality there also. But some things are depending on X. > Because of this I made those depended working with X. In the start of > my .emacs I have: > (defconst +using-X+ (getenv "DISPLAY")) > > And where I use X-functionality (not much at the moment) I have: > (unless (not +using-X+) Why use "unless + not" when you can simply use "when"? > (set-scroll-bar-mode 'right) > (tool-bar-mode -1)) The idiomatic way to do this is: (when (eq window-system 'x) ...) Also, these things are not dependent on X, they work with any window system (e.g. Mac, Windows). So you may just want to do: (when window-system ...) -- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 19:35 Functions that need X Cecil Westerhof 2011-01-01 21:32 ` Barry Margolin @ 2011-01-01 21:58 ` Tim X 2011-01-01 23:29 ` Barry Margolin 2011-01-03 14:46 ` Cecil Westerhof 2011-01-11 0:24 ` Kevin Rodgers 2 siblings, 2 replies; 11+ messages in thread From: Tim X @ 2011-01-01 21:58 UTC (permalink / raw To: help-gnu-emacs Cecil Westerhof <Cecil@decebal.nl> writes: > I have a lot of functionality written for my Emacs. I was asked to > maintain a server for a friend. I installed Emacs there and put my > Emacs functionality there also. But some things are depending on X. > Because of this I made those depended working with X. In the start of > my .emacs I have: > (defconst +using-X+ (getenv "DISPLAY")) > Alternatively, just use the built-in variable window-system i.e. (unless (eq 'x window-system) ....) or even better, use one of the display capability predicates, such as (unless (display-graphic-p) ...) > And where I use X-functionality (not much at the moment) I have: > (unless (not +using-X+) > (set-scroll-bar-mode 'right) > (tool-bar-mode -1)) Do you actually need the above? Long time since I've used emacs in a non-graphics mode, but when I did, you didn't get things like tool-bar unless the display could support it. One of the reasons I no longer use emacs in console mode is because I do almost everything on remote systems via tramp these days and very rarely need to run a remote emacs. Tim -- tcross (at) rapttech dot com dot au ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 21:58 ` Tim X @ 2011-01-01 23:29 ` Barry Margolin 2011-01-02 22:46 ` Tim X 2011-01-03 4:52 ` Stefan Monnier 2011-01-03 14:46 ` Cecil Westerhof 1 sibling, 2 replies; 11+ messages in thread From: Barry Margolin @ 2011-01-01 23:29 UTC (permalink / raw To: help-gnu-emacs In article <8739pcwake.fsf@puma.rapttech.com.au>, Tim X <timx@nospam.dev.null> wrote: > Cecil Westerhof <Cecil@decebal.nl> writes: > > > I have a lot of functionality written for my Emacs. I was asked to > > maintain a server for a friend. I installed Emacs there and put my > > Emacs functionality there also. But some things are depending on X. > > Because of this I made those depended working with X. In the start of > > my .emacs I have: > > (defconst +using-X+ (getenv "DISPLAY")) > > > > Alternatively, just use the built-in variable window-system i.e. > > (unless (eq 'x window-system) > ....) > > or even better, use one of the display capability predicates, such as > > (unless (display-graphic-p) > ...) > > > And where I use X-functionality (not much at the moment) I have: > > (unless (not +using-X+) > > (set-scroll-bar-mode 'right) > > (tool-bar-mode -1)) > > Do you actually need the above? Long time since I've used emacs in a > non-graphics mode, but when I did, you didn't get things like tool-bar > unless the display could support it. The reason is that if the display doesn't support it these functions aren't even defined, so you get an error when you try to turn off the nonexistent tool bar. It probably would be better if there were stub versions of all these functions in console Emacs, so that they would just be ignored. But since there aren't, you need to check first. -- Barry Margolin, barmar@alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 23:29 ` Barry Margolin @ 2011-01-02 22:46 ` Tim X 2011-01-03 14:34 ` Cecil Westerhof 2011-01-03 4:52 ` Stefan Monnier 1 sibling, 1 reply; 11+ messages in thread From: Tim X @ 2011-01-02 22:46 UTC (permalink / raw To: help-gnu-emacs Barry Margolin <barmar@alum.mit.edu> writes: > In article <8739pcwake.fsf@puma.rapttech.com.au>, > Tim X <timx@nospam.dev.null> wrote: > >> Cecil Westerhof <Cecil@decebal.nl> writes: >> >> > I have a lot of functionality written for my Emacs. I was asked to >> > maintain a server for a friend. I installed Emacs there and put my >> > Emacs functionality there also. But some things are depending on X. >> > Because of this I made those depended working with X. In the start of >> > my .emacs I have: >> > (defconst +using-X+ (getenv "DISPLAY")) >> > >> >> Alternatively, just use the built-in variable window-system i.e. >> >> (unless (eq 'x window-system) >> ....) >> >> or even better, use one of the display capability predicates, such as >> >> (unless (display-graphic-p) >> ...) >> >> > And where I use X-functionality (not much at the moment) I have: >> > (unless (not +using-X+) >> > (set-scroll-bar-mode 'right) >> > (tool-bar-mode -1)) >> >> Do you actually need the above? Long time since I've used emacs in a >> non-graphics mode, but when I did, you didn't get things like tool-bar >> unless the display could support it. > > The reason is that if the display doesn't support it these functions > aren't even defined, so you get an error when you try to turn off the > nonexistent tool bar. Actually, in emacs 24.0.50, you can call tool-bar-mode with no problems from the console - it doesn't appear to do anything if the display cannot handle tool-bars. You are correct, set-scroll-bar-mode does not exist under the console. I also find the documentation for that command a bit weak i.e. ,----[ C-h f set-scroll-bar-mode RET ] | set-scroll-bar-mode is a compiled Lisp function in `scroll-bar.el'. | | (set-scroll-bar-mode VALUE) | | Set `scroll-bar-mode' to VALUE and put the new value into effect. `---- Documentation of that type reminds me of code comments you see like x := 3; // set x to 3 100% accurate and 100% useless! I think this one deserves a bug report. The documentation should at least give some indication on what the allowed values for 'VALUE' are and what they would do. > > It probably would be better if there were stub versions of all these > functions in console Emacs, so that they would just be ignored. But > since there aren't, you need to check first. I'd not noticed this before as I use Xresources to disable much of this sort of thing in my .emacs, but I think your correct and a stub for this under non-scrolling environments whould be useful. I suspect the reason it doesn't happen is to avoid namespace pollution and loading of unnecessary packages (thinking that any stub would likely be part of scroll-bar.el and without careful or considerable re-engineering, may be difficul to only load sufficient code to just handle that endge case without also loading lots of other unnecessary stuff - not a reason not todo it, but possibly explains why it has not been done). I suspect this is also one of those situations where custom has an advantage over hand crafted code in .emacs i.e. disabling scroll bars using custom does not cause errors when run under the console. I think I'll log a bug report for set-scroll-bar-mode. If it is a consistent mode and follows the norms for +/- 1 or nil etc, it should jus say that. Tim -- tcross (at) rapttech dot com dot au ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-02 22:46 ` Tim X @ 2011-01-03 14:34 ` Cecil Westerhof 2011-01-03 15:55 ` Drew Adams 0 siblings, 1 reply; 11+ messages in thread From: Cecil Westerhof @ 2011-01-03 14:34 UTC (permalink / raw To: help-gnu-emacs Op zondag 2 jan 2011 23:46 CET schreef Tim X.: > I suspect this is also one of those situations where custom has an > advantage over hand crafted code in .emacs i.e. disabling scroll bars > using custom does not cause errors when run under the console. Not in my case. I have a generic file, which I distribute on many computers. I would not like to do the custom bit on all of them. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ^ permalink raw reply [flat|nested] 11+ messages in thread
* RE: Functions that need X 2011-01-03 14:34 ` Cecil Westerhof @ 2011-01-03 15:55 ` Drew Adams 0 siblings, 0 replies; 11+ messages in thread From: Drew Adams @ 2011-01-03 15:55 UTC (permalink / raw To: 'Cecil Westerhof', help-gnu-emacs > > I suspect this is also one of those situations where custom has an > > advantage over hand crafted code in .emacs i.e. disabling > > scroll bars using custom does not cause errors when run under the console. > > Not in my case. I have a generic file, which I distribute on many > computers. I would not like to do the custom bit on all of them. I can't speak directly to your particular situation, no doubt, but in general you can create once and then distribute the same `custom-file' or just part of it (e.g. `custom-set-variables'), not necessarily assigning it as the value of any given user's `custom-file' var. IOW, Customize just creates Lisp code for you to load (or not). ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 23:29 ` Barry Margolin 2011-01-02 22:46 ` Tim X @ 2011-01-03 4:52 ` Stefan Monnier 2011-01-03 5:45 ` Tim X 1 sibling, 1 reply; 11+ messages in thread From: Stefan Monnier @ 2011-01-03 4:52 UTC (permalink / raw To: help-gnu-emacs > It probably would be better if there were stub versions of all these > functions in console Emacs, so that they would just be ignored. But > since there aren't, you need to check first. The general rule I'd like to follow (tho Emacs doesn't follow it yet) is that a function that is not specific to one particular kind of display (tty, X11, w32, you name it) should always be defined. So if/when you bump into such a function that's only defined when used (or compiled) with a GUI, please report it as a bug. Stefan ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-03 4:52 ` Stefan Monnier @ 2011-01-03 5:45 ` Tim X 0 siblings, 0 replies; 11+ messages in thread From: Tim X @ 2011-01-03 5:45 UTC (permalink / raw To: help-gnu-emacs Stefan Monnier <monnier@iro.umontreal.ca> writes: >> It probably would be better if there were stub versions of all these >> functions in console Emacs, so that they would just be ignored. But >> since there aren't, you need to check first. > > The general rule I'd like to follow (tho Emacs doesn't follow it yet) is > that a function that is not specific to one particular kind of display > (tty, X11, w32, you name it) should always be defined. > > So if/when you bump into such a function that's only defined when used > (or compiled) with a GUI, please report it as a bug. > > OK, will do so for set-scroll-bar-mode Tim -- tcross (at) rapttech dot com dot au ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 21:58 ` Tim X 2011-01-01 23:29 ` Barry Margolin @ 2011-01-03 14:46 ` Cecil Westerhof 1 sibling, 0 replies; 11+ messages in thread From: Cecil Westerhof @ 2011-01-03 14:46 UTC (permalink / raw To: help-gnu-emacs Op zaterdag 1 jan 2011 22:58 CET schreef Tim X.: >> I have a lot of functionality written for my Emacs. I was asked to >> maintain a server for a friend. I installed Emacs there and put my >> Emacs functionality there also. But some things are depending on X. >> Because of this I made those depended working with X. In the start of >> my .emacs I have: >> (defconst +using-X+ (getenv "DISPLAY")) >> > > Alternatively, just use the built-in variable window-system i.e. > > (unless (eq 'x window-system) > ....) > > or even better, use one of the display capability predicates, such as > > (unless (display-graphic-p) > ...) I did not know this. Combining with another tip the code now has become: (when (display-graphic-p) (set-scroll-bar-mode 'right) (tool-bar-mode -1)) > One of the reasons I no longer use emacs in console mode is because I do > almost everything on remote systems via tramp these days and very rarely > need to run a remote emacs. I work with screen and emacs on this system. The problem is that sometimes the connection goes away. And if this happens my emacs will hang. With screen I just can continue where I left of after the connection is restored. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: Functions that need X 2011-01-01 19:35 Functions that need X Cecil Westerhof 2011-01-01 21:32 ` Barry Margolin 2011-01-01 21:58 ` Tim X @ 2011-01-11 0:24 ` Kevin Rodgers 2 siblings, 0 replies; 11+ messages in thread From: Kevin Rodgers @ 2011-01-11 0:24 UTC (permalink / raw To: help-gnu-emacs On 1/1/11 12:35 PM, Cecil Westerhof wrote: > I have a lot of functionality written for my Emacs. I was asked to > maintain a server for a friend. I installed Emacs there and put my > Emacs functionality there also. But some things are depending on X. > Because of this I made those depended working with X. In the start of > my .emacs I have: > (defconst +using-X+ (getenv "DISPLAY")) > > And where I use X-functionality (not much at the moment) I have: > (unless (not +using-X+) > (set-scroll-bar-mode 'right) > (tool-bar-mode -1)) (when (eq window-system 'x) ...) or probably just (when window-system ...) -- Kevin Rodgers Denver, Colorado, USA ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2011-01-11 0:24 UTC | newest] Thread overview: 11+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2011-01-01 19:35 Functions that need X Cecil Westerhof 2011-01-01 21:32 ` Barry Margolin 2011-01-01 21:58 ` Tim X 2011-01-01 23:29 ` Barry Margolin 2011-01-02 22:46 ` Tim X 2011-01-03 14:34 ` Cecil Westerhof 2011-01-03 15:55 ` Drew Adams 2011-01-03 4:52 ` Stefan Monnier 2011-01-03 5:45 ` Tim X 2011-01-03 14:46 ` Cecil Westerhof 2011-01-11 0:24 ` Kevin Rodgers
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