[9fans] acme tags for shell scripts

[Gorka Guardiola <paurea@lsub.org>]

I was trying to access the tag of the current window on acme from a
shell script and found it impossible.  The problem is that there is no
way to get back the id of the current window (the one the script is
run on) in the shell script in order to access to /dev/wsys/%d.  I have
looked the way win does it (binding the current window on /dev/wsys/id
and done it for every script run in acme).  It is a little change,
which makes ID obsolete (it can be a shell script now), and makes
scripts on acme more powerful.  It doesn't seem to break anything.
What do you think about it?.  Does it break anything, is it
necessary?.  Is there anything I haven't seen?.



I will create a patch tonight as I don't have time now, but the
diff is very simple... (I haven't taken ID out yet, that will take
some more work as I am not that familiar with acme).

term% yesterday -D /sys/src/cmd/acme
post...
diff -n /n/dump/2004/1014/sys/src/cmd/acme /sys/src/cmd/acme
diff -n /n/dump/2004/1014/sys/src/cmd/acme/exec.c /sys/src/cmd/acme/exec.c
/n/dump/2004/1014/sys/src/cmd/acme/exec.c:1206 c /sys/src/cmd/acme/exec.c:1206
< 		c->md = fsysmount(rdir, ndir, incl, nincl);
---
> 		c->md = fsysmount(rdir, ndir, incl, nincl, win->id);
diff -n /n/dump/2004/1014/sys/src/cmd/acme/fns.h /sys/src/cmd/acme/fns.h
/n/dump/2004/1014/sys/src/cmd/acme/fns.h:66 c /sys/src/cmd/acme/fns.h:66
< Mntdir*	fsysmount(Rune*, int, Rune**, int);
---
> Mntdir*	fsysmount(Rune*, int, Rune**, int, int);
diff -n /n/dump/2004/1014/sys/src/cmd/acme/fsys.c /sys/src/cmd/acme/fsys.c
/n/dump/2004/1014/sys/src/cmd/acme/fsys.c:246 c /sys/src/cmd/acme/fsys.c:246
< fsysmount(Rune *dir, int ndir, Rune **incl, int nincl)
---
> fsysmount(Rune *dir, int ndir, Rune **incl, int nincl, int winid)
/n/dump/2004/1014/sys/src/cmd/acme/fsys.c:248 c /sys/src/cmd/acme/fsys.c:248
< 	char buf[256];
---
> 	char buf[256], *wpath;
/n/dump/2004/1014/sys/src/cmd/acme/fsys.c:264 a /sys/src/cmd/acme/fsys.c:265,270
> 	wpath=smprint("/mnt/acme/%d", winid);
> 	if(bind(wpath, "/dev/acme", MBEFORE) < 0){
> 		fsysdelid(m);
> 		return nil;
> 	}
> 	free(wpath);


An example of use of this (for the tags program by nemo) is using T tag to mark
the current file:

#!/bin/rc

acmepath=`{cat /dev/acme/tag|awk '{print $1}'}
if(~ $#* 0){	
	grep -n $acmepath $home/lib/*.tags
}
if not{
	tag/Tag $acmepath $*
}


ID as a shell script:

#!/bin/rc

cat /dev/acme/ctl|awk '{print $1}'