Adding this feature turned out to be pretty easy. If anyone else is
interested, here's a patch that allows you to write a message of the
form "col i\n" to /n/ctl to move window n to the i th column from the
left, starting with 0.
diff -r ad2f6f64fbc8 src/cmd/acme/xfid.c
--- a/src/cmd/acme/xfid.c Wed Jan 12 00:54:22 2011 -0500
+++ b/src/cmd/acme/xfid.c Wed Jan 19 03:39:10 2011 -0500
@@ -780,6 +780,26 @@
if(strncmp(p, "scroll", 6) == 0){ /* turn on automatic
scrolling
(writes to body only) */
w->noscroll = FALSE;
m = 6;
+ }else
+ if(strncmp(p, "col ", 4) == 0){
+ pp = p+4;
+ m = 4;
+ q = memchr(pp, '\n', e-pp);
+ if(q==nil || q==pp){
+ err = Ebadctl;
+ break;
+ }
+ *q = 0;
+ i = atoi(pp);
+ if(i < 0 || i >= row.ncol){
+ err = Ebadctl;
+ break;
+ }
+ if(row.col[i] != w->col){
+ colclose(w->col, w, FALSE);
+ coladd(row.col[i], w, nil, 0);
+ }
+ m += (q+1) - pp;
}else{
err = Ebadctl;
break;
