Make "hg log --style=changelog > changelog" work (issue338)

Style files in templates/ now take precedence over current directory.
This can be overridden with --style=./changelog if really neeeded.
Added test for issue338.

mercurial/commands.py

@@ -399,9 +399,9 b' def show_changeset(ui, repo, opts):'
 
     if tmpl or mapfile:
         if mapfile:
-            if not os.path.isfile(mapfile):
-                mapname = templater.templatepath('map-cmdline.' + mapfile)
-                if not mapname: mapname = templater.templatepath(mapfile)
+            if not os.path.split(mapfile)[0]:
+                mapname = (templater.templatepath('map-cmdline.' + mapfile)
+                           or templater.templatepath(mapfile))
                 if mapname: mapfile = mapname
         try:
             t = templater.changeset_templater(ui, repo, mapfile)

tests/test-command-template

@@ -65,6 +65,10 b" echo '[ui]' > .hg/hgrc"
 echo 'style = t' >> .hg/hgrc
 hg log
 
+echo '# issue338'
+hg log --style=changelog > changelog
+cat changelog
+
 echo "# keys work"
 for key in author branches date desc file_adds file_dels files \
         manifest node parents rev tags; do

tests/test-command-template.out

@@ -76,6 +76,33 b' 3'
 2
 1
 0
+# issue338
[phone]  person  <person>
+
+	* c:
+	no user, no domain
+	[10e46f2dcbf4] [tip]
+
[phone]  other  <other@place>
+
+	* c:
+	no person
+	[97054abb4ab8]
+
[phone]  A. N. Other  <other@place>
+
+	* b:
+	other 1 other 2
+
+	other 3
+	[b608e9d1a3f0]
+
[phone]  User Name  <user@hostname>
+
+	* a:
+	line 1 line 2
+	[1e4e1b8f71e0]
+
 # keys work
 author: person
 author: other@place