PATCH: Re: Bug w/matching control + feature request

[Sven Wischnowsky <wischnow@informatik.hu-berlin.de>]

Felix Rosencrantz wrote:

> Thanks for adding the cycle-completion-positions code, Sven! 

Thanks for helping to debug it.

> Though, there
> seems to be a problem with it.
> 
> Check out
> % zsh -f
> host% autoload -U compinit cycle-completion-positions ; compinit -D 
> host% compdef _tst tst
> host% _tst () {compadd -M 'r:|[.,_-]=** r:[^0-9]||[0-9]=**' _cd a_c ab_c
> _b_cde_c}
> host% zle -N cycle cycle-completion-positions
> host% bindkey "^T" cycle
> host% tst _c<TAB><^T>
> 
> After the tab it lists the possible completions.  But the value of
> $_lastcomp[insert_positions] is 4:6:6, which causes the
> cycle-completion-positions to get stuck at cursor position 6.  Not sure
> if there should be unique values or cycle-completion-positions should
> be able to deal with the duplicate values.

In this case it was because the position after the word is always
unconditionally added (that seemed sensible, even if there may be
cases when there is nothing missing at the end).

I've added code to make sure every position is added only once.

> There are other cases, where there is only one value but there should be
> multiple positions.  But I wasn't sure if it would be possible to list all the
> positions. (Use same input but with
> 	_tst () {compadd -M 'r:|[.,_-]=** r:[^0-9]||[0-9]=**' _cd a_c ab_c }
> 
> and the positions are 6:6, and there should be two positions.)

This was actually caused by a flaw deeper down in the engine room. The 
code didn't mark the first cline as having missing characters. With
the patch below this also means that by default the cursor is placed
there (at the beginning) because it looks friendlier to the code in
cline_str().


Bye
 Sven

Index: Src/Zle/compmatch.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/compmatch.c,v
retrieving revision 1.28
diff -u -r1.28 compmatch.c
--- Src/Zle/compmatch.c	2001/01/10 09:24:46	1.28
+++ Src/Zle/compmatch.c	2001/01/12 13:47:34
@@ -1627,6 +1627,8 @@
 	    *orest = NULL;
 	if (nrest)
 	    *nrest = n;
+	if (n)
+	    ot->flags |= CLF_MISS;
 
 	return;
     }
Index: Src/Zle/compresult.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/compresult.c,v
retrieving revision 1.30
diff -u -r1.30 compresult.c
--- Src/Zle/compresult.c	2001/01/11 10:06:50	1.30
+++ Src/Zle/compresult.c	2001/01/12 13:47:35
@@ -165,7 +165,7 @@
 cline_str(Cline l, int ins, int *csp, LinkList posl)
 {
     Cline s;
-    int ocs = cs, ncs, pcs, scs;
+    int ocs = cs, ncs, pcs, scs, opos, npos;
     int pm, pmax, pmm, pma, sm, smax, smm, sma, d, dm, mid;
     int i, j, li = 0, cbr, padd = (ins ? wb - ocs : -ocs);
     Brinfo brp, brs;
@@ -224,8 +224,10 @@
 
 		if ((s->flags & CLF_DIFF) && (!dm || (s->flags & CLF_MATCHED))) {
 		    d = cs; dm = s->flags & CLF_MATCHED;
-		    if (posl)
-			addlinknode(posl, (void *) ((long) (cs + padd)));
+		    if (posl && (npos = cs + padd) != opos) {
+			opos = npos;
+			addlinknode(posl, (void *) ((long) npos));
+		    }
 		}
 		li += s->llen;
 	    }
@@ -247,8 +249,10 @@
 	/* Remember the position if this is the first prefix with
 	 * missing characters. */
 	if ((l->flags & CLF_MISS) && !(l->flags & CLF_SUF)) {
-	    if (posl && l->min != l->max)
-		addlinknode(posl, (void *) ((long) (cs + padd)));
+	    if (posl && l->min != l->max && (npos = cs + padd) != opos) {
+		opos = npos;
+		addlinknode(posl, (void *) ((long) npos));
+	    }
 	    if (((pmax < (l->max - l->min) || (pma && l->max != l->min)) &&
 		 (!pmm || (l->flags & CLF_MATCHED))) ||
 		((l->flags & CLF_MATCHED) && !pmm)) {
@@ -299,8 +303,10 @@
 	    if (l->flags & CLF_MID)
 		mid = cs;
 	    else if (l->flags & CLF_SUF) {
-		if (posl && l->min != l->max)
-		    addlinknode(posl, (void *) ((long) (cs + padd)));
+		if (posl && l->min != l->max && (npos = cs + padd) != opos) {
+		    opos = npos;
+		    addlinknode(posl, (void *) ((long) npos));
+		}
 		if (((smax < (l->min - l->max) || (sma && l->max != l->min)) &&
 		     (!smm || (l->flags & CLF_MATCHED))) ||
 		    ((l->flags & CLF_MATCHED) && !smm)) {
@@ -399,14 +405,16 @@
 	    cs += i;
 	    if (j >= 0 && (!dm || (js->flags & CLF_MATCHED))) {
 		d = cs - j; dm = js->flags & CLF_MATCHED;
-		if (posl)
-		    addlinknode(posl, (void *) ((long) (cs - j + padd)));
+		if (posl && (npos = cs - j + padd) != opos) {
+		    opos = npos;
+		    addlinknode(posl, (void *) ((long) npos));
+		}
 	    }
 	}
 	l = l->next;
     }
-    if (posl)
-	addlinknode(posl, (void *) ((long) (cs + padd)));
+    if (posl && (npos = cs + padd) != opos)
+	addlinknode(posl, (void *) ((long) npos));
     if (ins) {
 	int ocs = cs;
 

--
Sven Wischnowsky                         wischnow@informatik.hu-berlin.de