[9fans] winclear in p9p

[9fans] winclear in p9p

[Matthias Teege]

Moin,

I've found

fn winclear {
	echo -n Edit ,d > /dev/acme/body
	echo -n /Edit ,d/ > /dev/acme/addr
	echo -n 'dot=addr' > /dev/acme/ctl
	cat /dev/acme/addr | awk '{printf("MX%s %s\n", $1, $2)}' > /dev/acme/event
}

in the wiki but how do I clear a win in Plan 9 ports? To be accurate I
need to replace some text in the middle of the body and it would be
nice, if I can avoid a tempfile.

Many thanks
Matthias

Re: [9fans] winclear in p9p

[Paul Lalonde]

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Looking at this briefly, I discovered that the p9p version of acme  
doesn't make available body/addr/ctl/event of the current selected  
window.  So the straightforward "substitute 9p commands" fails.

What is the correct way for a script to discover the ID of the acme  
window it was run from?  I could trap the command in the plumber and  
add the id as a parameter, but that's rather intrusive.

Paul

On 31-Oct-06, at 9:22 AM, Matthias Teege wrote:

> Moin,
>
> I've found
>
> fn winclear {
> 	echo -n Edit ,d > /dev/acme/body
> 	echo -n /Edit ,d/ > /dev/acme/addr
> 	echo -n 'dot=addr' > /dev/acme/ctl
> 	cat /dev/acme/addr | awk '{printf("MX%s %s\n", $1, $2)}' > /dev/ 
> acme/event
> }
>
> in the wiki but how do I clear a win in Plan 9 ports? To be accurate I
> need to replace some text in the middle of the body and it would be
> nice, if I can avoid a tempfile.
>
> Many thanks
> Matthias

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Re: [9fans] winclear in p9p

[Russ Cox]

9p read acme/$winid/tag
(Same as cat /mnt/acme/$winid/tag in Plan 9.)

Russ

Re: [9fans] winclear in p9p

[Russ Cox]

> fn winclear {
>         echo -n Edit ,d > /dev/acme/body
>         echo -n /Edit ,d/ > /dev/acme/addr
>         echo -n 'dot=addr' > /dev/acme/ctl
>         cat /dev/acme/addr | awk '{printf("MX%s %s\n", $1, $2)}' > /dev/acme/event
> }

I finally read this part of the message.
This is a remarkably complicated way to go about deleting the window text!

Here is a simpler one:

	echo -n , >/mnt/acme/$winid/addr
	echo -n >/mnt/acme/$winid/data

(Or on Unix:
	echo -n , | 9p write acme/$winid/addr
	9p write acme/$winid/data </dev/null
)

Russ

Re: Re: [9fans] winclear in p9p

[David Leimbach]

On 11/9/06, Russ Cox <rsc@swtch.com> wrote:
> > fn winclear {
> >         echo -n Edit ,d > /dev/acme/body
> >         echo -n /Edit ,d/ > /dev/acme/addr
> >         echo -n 'dot=addr' > /dev/acme/ctl
> >         cat /dev/acme/addr | awk '{printf("MX%s %s\n", $1, $2)}' > /dev/acme/event
> > }
>
> I finally read this part of the message.
> This is a remarkably complicated way to go about deleting the window text!

Yep and I posted it literally months ago as I was just exploring the
Acme filesystem.

>
> Here is a simpler one:
>
>         echo -n , >/mnt/acme/$winid/addr
>         echo -n >/mnt/acme/$winid/data
>
> (Or on Unix:
>         echo -n , | 9p write acme/$winid/addr
>         9p write acme/$winid/data </dev/null
> )
>
> Russ
>

Re: Re: [9fans] winclear in p9p

[David Leimbach]

On 11/9/06, Russ Cox <rsc@swtch.com> wrote:
> > fn winclear {
> >         echo -n Edit ,d > /dev/acme/body
> >         echo -n /Edit ,d/ > /dev/acme/addr
> >         echo -n 'dot=addr' > /dev/acme/ctl
> >         cat /dev/acme/addr | awk '{printf("MX%s %s\n", $1, $2)}' > /dev/acme/event
> > }
>
> I finally read this part of the message.
> This is a remarkably complicated way to go about deleting the window text!
>
> Here is a simpler one:
>
>         echo -n , >/mnt/acme/$winid/addr
>         echo -n >/mnt/acme/$winid/data
>

Maybe it's how I keyed it in, or that I've got the worst cold I've had
in about 6 or 7 years, but I'm getting invalid address with this
version.  It looks cleaner but for some reason it's just not liking
me.

> (Or on Unix:
>         echo -n , | 9p write acme/$winid/addr
>         9p write acme/$winid/data </dev/null
> )
>
> Russ
>

Re: Re: [9fans] winclear in p9p

[Arvindh Rajesh Tamilmani]

> > Here is a simpler one:
> >
> >         echo -n , >/mnt/acme/$winid/addr
> >         echo -n >/mnt/acme/$winid/data
> >
>
> Maybe it's how I keyed it in, or that I've got the worst cold I've had
> in about 6 or 7 years, but I'm getting invalid address with this
> version.  It looks cleaner but for some reason it's just not liking
> me.

Were you trying it on win(1)?
I think the original winclear was built for that.

The two-liner clears win, but then win stops responding to commands.

The following patch to win/main.c seems to make the two-liner work.

Arvindh

/acme/bin/source/win/main.c:237,243 - main.c:237,242
  	sprint(buf, "#%lud,#%lud", q0, q0+n);
  	winsetaddr(w, buf, 0);
  	write(w->data, buf, 0);
- 	*q1 -= n;
  	return 0;
  }

/acme/bin/source/win/main.c:457,463 - main.c:456,466
  		case 'F':	/* generated by our actions (specifically case 'S' above) */
  			delta = e->q1-e->q0;
  			if(e->c2=='D'){
- 				/* we know about the delete by _sendinput */
+ 				endpt -= delta;
+ 				if(e->q1 < hostpt)
+ 					hostpt -= delta;
+ 				else if(e->q0 < hostpt)
+ 					hostpt = e->q0;
  				break;
  			}
  			if(e->c2=='I'){