Make profile stacking of default USE and package.* slightly more efficient

by skipping list.insert() calls when possible.

svn path=/main/trunk/; revision=9415

diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py
index 2d30d0102d8ef5afa319554cf9c1ce4f55e9e1f1..d5daf9648ae356b5c30d8f0fae4fb2f9106bbe04 100644 (file)
--- a/pym/portage/__init__.py
+++ b/pym/portage/__init__.py
@@ -1878,7 +1878,8 @@ class config(object):
                                        else:
                                                break
                                del keys
-                       defaults.insert(pos, self.make_defaults_use[i])
+                       if self.make_defaults_use[i]:
+                               defaults.insert(pos, self.make_defaults_use[i])
                        pos = len(defaults)
                defaults = " ".join(defaults)
                if defaults != self.configdict["defaults"].get("USE",""):
@@ -1898,7 +1899,8 @@ class config(object):
                                        else:
                                                break
                                del keys
-                       useforce.insert(pos, self.useforce_list[i])
+                       if self.useforce_list[i]:
+                               useforce.insert(pos, self.useforce_list[i])
                        pos = len(useforce)
                useforce = set(stack_lists(useforce, incremental=True))
                if useforce != self.useforce:
@@ -1918,7 +1920,8 @@ class config(object):
                                        else:
                                                break
                                del keys
-                       usemask.insert(pos, self.usemask_list[i])
+                       if self.usemask_list[i]:
+                               usemask.insert(pos, self.usemask_list[i])
                        pos = len(usemask)
                usemask = set(stack_lists(usemask, incremental=True))
                if usemask != self.usemask: