status: support commands.status.relative config

When the config is set to true, status output becomes relative to the
working directory. This has bugged me since I started using hg and it
turns it is sillily simple to support it (unless I missed something,
of course).

We could also add a --relative flag, but I would personally always
want that on, and I haven't heard any use for having it sometimes on,
so this patch only lets you enable it via config.

mercurial/commands.py

@@ -4734,7 +4734,7 def status(ui, repo, *pats, **opts):
     else:
         node1, node2 = scmutil.revpair(repo, revs)
 
-    if pats:
+    if pats or ui.configbool('commands', 'status.relative'):
         cwd = repo.getcwd()
     else:
         cwd = ''

mercurial/help/config.txt

@@ -417,6 +417,10 effect and style see :hg:`help color`.
 ``commands``
 ----------
 
+``status.relative``
+    Make paths in ``hg status`` output relative to the current directory.
+    (default: False)
+
 ``update.requiredest``
     Require that the user pass a destination when running ``hg update``.
     For example, ``hg update .::`` will be allowed, but a plain ``hg update``

tests/test-status.t

@@ -107,6 +107,27 combining patterns with root and pattern
   ? a/in_a
   ? b/in_b
 
+relative paths can be requested
+
+  $ cat >> $HGRCPATH <<EOF
+  > [commands]
+  > status.relative = True
+  > EOF
+  $ hg status --cwd a
+  ? 1/in_a_1
+  ? in_a
+  ? ../b/1/in_b_1
+  ? ../b/2/in_b_2
+  ? ../b/in_b
+  ? ../in_root
+  $ HGPLAIN=1 hg status --cwd a
+  ? a/1/in_a_1
+  ? a/in_a
+  ? b/1/in_b_1
+  ? b/2/in_b_2
+  ? b/in_b
+  ? in_root
+
   $ cd ..
 
   $ hg init repo2