patch 7.4.709

Problem:    ":tabmove" does not work as documented.
Solution:   Make it work consistently.  Update documentation and add tests.
            (Hirohito Higashi)

runtime/doc/tabpage.txt

@@ -202,23 +202,29 @@ REORDERING TAB PAGES:
 		Move the current tab page to after tab page N.  Use zero to
 		make the current tab page the first one.  Without N the tab
 		page is made the last one. >
+		    :.tabmove	" do nothing
 		    :-tabmove	" move the tab page to the left
-		    :tabmove	" move the tab page to the right
+		    :+tabmove	" move the tab page to the right
-		    :.tabmove	" as above
-		    :+tabmove	" as above
 		    :0tabmove	" move the tab page to the beginning of the tab
 				" list
-		    :$tabmove	" move the tab page to the end of the tab list
+		    :tabmove 0	" as above
-<
+		    :tabmove	" move the tab page to the last
+		    :$tabmove	" as above
+		    :tabmove $	" as above
 
 :tabm[ove] +[N]
 :tabm[ove] -[N]
 		Move the current tab page N places to the right (with +) or to
-		the left (with -).
+		the left (with -). >
+		    :tabmove -	" move the tab page to the left
+		    :tabmove -1	" as above
+		    :tabmove +	" move the tab page to the right
+		    :tabmove +1	" as above
+
 
 Note that although it is possible to move a tab behind the N-th one by using
-:Ntabmove, it is impossible to move it by N places by using :+Ntabmove. For
+:Ntabmove. And move it by N places by using :+Ntabmove. For clarification what
-clarification what +N means in this context see |[range]|.
++N means in this context see |[range]|.
 
 
 LOOPING OVER TAB PAGES:

src/ex_docmd.c

@@ -8145,7 +8145,7 @@ ex_tabnext(eap)
 ex_tabmove(eap)
     exarg_T	*eap;
 {
-    int tab_number = 9999;
+    int tab_number;
 
     if (eap->arg && *eap->arg != NUL)
     {
@@ -8166,19 +8166,38 @@ ex_tabmove(eap)
 	else
 	    p = eap->arg;
 
-	if (p == skipdigits(p))
+	if (relative == 0)
 	{
-	    /* No numbers as argument. */
+	    if (STRCMP(p, "$") == 0)
-	    eap->errmsg = e_invarg;
+		tab_number = LAST_TAB_NR;
-	    return;
+	    else if (p == skipdigits(p))
+	    {
+		/* No numbers as argument. */
+		eap->errmsg = e_invarg;
+		return;
+	    }
+	    else
+		tab_number = getdigits(&p);
+	}
+	else
+	{
+	    if (*p != NUL)
+		tab_number = getdigits(&p);
+	    else
+		tab_number = 1;
+	    tab_number = tab_number * relative + tabpage_index(curtab);
+	    if (relative == -1)
+		--tab_number;
 	}
-
-	tab_number = getdigits(&p);
-	if (relative != 0)
-	    tab_number = tab_number * relative + tabpage_index(curtab) - 1;;
     }
     else if (eap->addr_count != 0)
+    {
 	tab_number = eap->line2;
+	if (**eap->cmdlinep == '-')
+	    --tab_number;
+    }
+    else
+	tab_number = LAST_TAB_NR;
 
     tabpage_move(tab_number);
 }

src/testdir/test62.in

@@ -96,30 +96,44 @@ STARTTEST
 :"
 :for i in range(9) | tabnew | endfor
 1gt
-Go=tabpagenr()
+:$put =tabpagenr()
 :tabmove 5
-
+:$put =tabpagenr()
+:.tabmove
+:$put =tabpagenr()
+:tabmove -
+:$put =tabpagenr()
+:tabmove +
+:$put =tabpagenr()
 :tabmove -2
-i=tabpagenr()
+:$put =tabpagenr()
 :tabmove +4
-
+:$put =tabpagenr()
 :tabmove
-i=tabpagenr()
+:$put =tabpagenr()
 :tabmove -20
-
+:$put =tabpagenr()
 :tabmove +20
-i=tabpagenr()
+:$put =tabpagenr()
+:0tabmove
+:$put =tabpagenr()
+:$tabmove
+:$put =tabpagenr()
+:tabmove 0
+:$put =tabpagenr()
+:tabmove $
+:$put =tabpagenr()
 :3tabmove
-
+:$put =tabpagenr()
 :7tabmove 5
-i=tabpagenr()
+:$put =tabpagenr()
 :let a='No error caught.'
 :try
 :tabmove foo
 :catch E474
 :let a='E474 caught.'
 :endtry
-:tabmove +20
+:$put =a
 :"
 :" Test autocommands
 :tabonly!

src/testdir/test62.ok

@@ -9,14 +9,21 @@ tab drop 1: pass
 tab drop 2: pass
 tab drop 3: pass
 1
-6
+5
+5
 4
-8
+5
+3
+7
+10
+1
+10
+1
 10
 1
 10
 4
-6
+5
 E474 caught.
 === tab split ===
 WinLeave

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    709,
 /**/
     708,
 /**/

src/window.c

@@ -4120,18 +4120,27 @@ goto_tabpage_win(tp, wp)
 }
 
 /*
- * Move the current tab page to before tab page "nr".
+ * Move the current tab page to after tab page "nr".
  */
     void
 tabpage_move(nr)
     int		nr;
 {
-    int		n = nr;
+    int		n = 1;
-    tabpage_T	*tp;
+    tabpage_T	*tp, *tp_dst;
 
     if (first_tabpage->tp_next == NULL)
 	return;
 
+    for (tp = first_tabpage; tp->tp_next != NULL && n < nr; tp = tp->tp_next)
+	++n;
+
+    if (tp == curtab || (nr > 0 && tp->tp_next != NULL
+						    && tp->tp_next == curtab))
+	return;
+
+    tp_dst = tp;
+
     /* Remove the current tab page from the list of tab pages. */
     if (curtab == first_tabpage)
 	first_tabpage = curtab->tp_next;
@@ -4146,17 +4155,15 @@ tabpage_move(nr)
     }
 
     /* Re-insert it at the specified position. */
-    if (n <= 0)
+    if (nr <= 0)
     {
 	curtab->tp_next = first_tabpage;
 	first_tabpage = curtab;
     }
     else
     {
-	for (tp = first_tabpage; tp->tp_next != NULL && n > 1; tp = tp->tp_next)
+	curtab->tp_next = tp_dst->tp_next;
-	    --n;
+	tp_dst->tp_next = curtab;
-	curtab->tp_next = tp->tp_next;
-	tp->tp_next = curtab;
     }
 
     /* Need to redraw the tabline.  Tab page contents doesn't change. */