In the slot collision display, show a maximum of 3 parents

for each package in order to avoid flooding the display.

svn path=/main/trunk/; revision=8500

1 files changed, 22 insertions, 0 deletions

diff --git a/pym/_emerge/__init__.py b/pym/_emerge/__init__.py
index e2c657aa3..8df77b558 100644
--- a/pym/_emerge/__init__.py
+++ b/pym/_emerge/__init__.py
@@ -1275,6 +1275,8 @@ class depgraph(object):
 			"package slot have been \n")
 		msg.append("!!! pulled into the dependency graph:\n\n")
 		indent = "  "
+		# Max number of parents shown, to avoid flooding the display.
+		max_parents = 3
 		for slot_atom, root in self._slot_collision_info:
 			msg.append(slot_atom)
 			msg.append("\n\n")
@@ -1288,11 +1290,31 @@ class depgraph(object):
 				msg.append(str(node))
 				parents = self._parent_child_digraph.parent_nodes(node)
 				if parents:
+					omitted_parents = 0
+					if len(parents) > max_parents:
+						omitted_parents = len(parents) - max_parents
+						pruned_list = []
+						# When generating the pruned list, prefer instances
+						# of DependencyArg over instances of Package.
+						for parent in parents:
+							if isinstance(parent, DependencyArg):
+								pruned_list.append(parent)
+								if len(pruned_list) == max_parents:
+									break
+						for parent in parents:
+							if not isinstance(parent, DependencyArg):
+								pruned_list.append(parent)
+								if len(pruned_list) == max_parents:
+									break
+						parents = pruned_list
 					msg.append(" pulled in by\n")
 					for parent in parents:
 						msg.append(2*indent)
 						msg.append(str(parent))
 						msg.append("\n")
+					if omitted_parents:
+						msg.append(2*indent)
+						msg.append("(and %d more)\n" % omitted_parents)
 				else:
 					msg.append(" (no parents)\n")
 				msg.append("\n")