1 files changed, 98 insertions, 0 deletions
diff --git a/waflib/extras/stale.py b/waflib/extras/stale.py
new file mode 100644
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+++ b/waflib/extras/stale.py
@@ -0,0 +1,98 @@
+#! /usr/bin/env python
+# encoding: UTF-8
+# Thomas Nagy, 2006-2015 (ita)
+
+"""
+Add a pre-build hook to remove build files (declared in the system)
+that do not have a corresponding target
+
+This can be used for example to remove the targets
+that have changed name without performing
+a full 'waf clean'
+
+Of course, it will only work if there are no dynamically generated
+nodes/tasks, in which case the method will have to be modified
+to exclude some folders for example.
+
+Make sure to set bld.post_mode = waflib.Build.POST_AT_ONCE
+"""
+
+from waflib import Logs, Build
+from waflib.Runner import Parallel
+
+DYNAMIC_EXT = [] # add your non-cleanable files/extensions here
+MOC_H_EXTS = '.cpp .cxx .hpp .hxx .h'.split()
+
+def can_delete(node):
+	"""Imperfect moc cleanup which does not look for a Q_OBJECT macro in the files"""
+	if not node.name.endswith('.moc'):
+		return True
+	base = node.name[:-4]
+	p1 = node.parent.get_src()
+	p2 = node.parent.get_bld()
+	for k in MOC_H_EXTS:
+		h_name = base + k
+		n = p1.search_node(h_name)
+		if n:
+			return False
+		n = p2.search_node(h_name)
+		if n:
+			return False
+
+		# foo.cpp.moc, foo.h.moc, etc.
+		if base.endswith(k):
+			return False
+
+	return True
+
+# recursion over the nodes to find the stale files
+def stale_rec(node, nodes):
+	if node.abspath() in node.ctx.env[Build.CFG_FILES]:
+		return
+
+	if getattr(node, 'children', []):
+		for x in node.children.values():
+			if x.name != "c4che":
+				stale_rec(x, nodes)
+	else:
+		for ext in DYNAMIC_EXT:
+			if node.name.endswith(ext):
+				break
+		else:
+			if not node in nodes:
+				if can_delete(node):
+					Logs.warn('Removing stale file -> %r', node)
+					node.delete()
+
+old = Parallel.refill_task_list
+def refill_task_list(self):
+	iit = old(self)
+	bld = self.bld
+
+	# execute this operation only once
+	if getattr(self, 'stale_done', False):
+		return iit
+	self.stale_done = True
+
+	# this does not work in partial builds
+	if bld.targets != '*':
+		return iit
+
+	# this does not work in dynamic builds
+	if getattr(bld, 'post_mode') == Build.POST_AT_ONCE:
+		return iit
+
+	# obtain the nodes to use during the build
+	nodes = []
+	for tasks in bld.groups:
+		for x in tasks:
+			try:
+				nodes.extend(x.outputs)
+			except AttributeError:
+				pass
+
+	stale_rec(bld.bldnode, nodes)
+	return iit
+
+Parallel.refill_task_list = refill_task_list
+