Restore some :tabmove argument errors and update :help for recent changes.

--HG--
extra : rebase_source : 496b6d553c64e88cef45620dc1f8210301ad5fe2

common/content/tabs.js

@@ -763,7 +763,7 @@ var Tabs = Module("tabs", {
                 function () { tabs.stopAll(); },
                 { argCount: "0" });
 
-            // TODO: add count support
+            // TODO: add count and bang multimatch support - unify with :buffer nonsense
             commands.add(["tabm[ove]"],
                 "Move the current tab to the position of tab N",
                 function (args) {
@@ -771,7 +771,8 @@ var Tabs = Module("tabs", {
 
                     if (tabs.indexFromSpec(arg) == -1) {
                         let tabs = [tab for (tab in matchTabs(args, true))];
-                        dactyl.assert(tabs.length == 1);
+                        dactyl.assert(tabs.length, _("error.invalidArgument", arg));
+                        dactyl.assert(tabs.length == 1, _("buffer.multipleMatching", arg));
                         arg = tabs[0];
                     }
                     tabs.move(tabs.getTab(), arg, args.bang);

common/locale/en-US/tabs.xml

@@ -205,6 +205,7 @@
 <item>
     <tags>b :b :buffer</tags>
     <spec>:<oa>count</oa>b<oa>uffer</oa><oa>!</oa> <oa>url|index</oa></spec>
+    <spec>:<oa>count</oa>b<oa>uffer</oa><oa>!</oa> <a>match</a></spec>
     <spec><oa>count</oa>b</spec>
     <description>
         <p>
@@ -216,8 +217,9 @@
 
         <p>
             If argument is neither a full URL nor an index but uniquely identifies a
-            buffer, it is selected. With <oa>!</oa> the next buffer matching the argument is
+            buffer, by a partial match with the URL or title, it is selected.
-            selected, even if it cannot be identified uniquely. Use <k>b</k> as a
+            With <oa>!</oa> the next buffer matching the argument is selected,
+            even if it cannot be identified uniquely. Use <k>b</k> as a
             shortcut to open this prompt.
         </p>
 
@@ -285,15 +287,20 @@
 
 <item>
     <tags>:tabm :tabmove</tags>
-    <spec>:tabm<oa>ove</oa> <oa>N</oa></spec>
+    <spec>:tabm<oa>ove</oa> <a>N</a></spec>
-    <spec>:tabm<oa>ove</oa><oa>!</oa> <oa>+N</oa> | <oa>-N</oa></spec>
+    <spec>:tabm<oa>ove</oa> <a>match</a></spec>
+    <spec>:tabm<oa>ove</oa><oa>!</oa> <a>+N|-N</a></spec>
     <description>
         <p>
-            Move the current tab to the position of tab <oa>N</oa>. When
+            Move the current tab to the position of tab <a>N</a>. When <a>N</a>
-            <oa>N</oa> is 0, the current tab is made the first one. <oa>N</oa>
+            is <em>$</em>, the current tab is made the last one. <a>N</a> can
-            can also be prefixed with ‘+’ or ‘-’ to indicate a relative
+            also be prefixed with <em>+</em> or <em>-</em> to indicate a
-            movement. If <oa>!</oa> is specified the movement wraps around the
+            relative movement. If <oa>!</oa> is specified the movement wraps
-            start or end of the tab list.
+            around the start or end of the tab list.
+        </p>
+        <p>
+            The tab index may also be selected by a general <a>match</a> string
+            like <ex>:buffer</ex>.
         </p>
     </description>
 </item>

common/tests/functional/testCommands.js

@@ -677,7 +677,14 @@ var tests = {
     tabdo: {},
     tabduplicate: {},
     tablast: {},
-    tabmove: {},
+    tabmove: {
+        error: [""],
+        noOutput: ["1", "$", "999", "-1", "+1", "! +1", "! -1", "-999", "+999", "! +999", "! -999"],
+        completions: [
+            ["", hasItems],
+            ["1", hasItems]
+        ]
+    },
     tabnext: {},
     tabonly: {},
     tabopen: {},