Don't read up entire directories to decide if an Alias is up-to-date.

1 files changed, 62 insertions, 0 deletions

diff --git a/src/engine/SCons/Scanner/Dir.py b/src/engine/SCons/Scanner/Dir.py
new file mode 100644
index 0000000..6161059
--- /dev/null
+++ b/src/engine/SCons/Scanner/Dir.py
@@ -0,0 +1,62 @@
+#
+# __COPYRIGHT__
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
+
+import string
+
+import SCons.Node.FS
+import SCons.Scanner
+
+def DirScanner(fs = SCons.Node.FS.default_fs, **kw):
+    """Return a prototype Scanner instance for scanning
+    directories for on-disk files"""
+    def only_dirs(nodes, fs=fs):
+        return filter(lambda n: isinstance(n.disambiguate(), SCons.Node.FS.Dir), nodes)
+    kw['node_factory'] = fs.Entry
+    kw['recursive'] = only_dirs
+    ds = apply(SCons.Scanner.Base, [scan, "DirScanner"], kw)
+    return ds
+
+skip_entry = {
+   '.' : 1,
+   '..' : 1,
+   '.sconsign' : 1,
+   '.sconsign.dblite' : 1,
+}
+
+def scan(node, env, path=()):
+    """
+    This scanner scans program files for static-library
+    dependencies.  It will search the LIBPATH environment variable
+    for libraries specified in the LIBS variable, returning any
+    files it finds as dependencies.
+    """
+    try:
+        flist = node.fs.listdir(node.abspath)
+    except OSError:
+        return []
+    dont_scan = lambda k: not skip_entry.has_key(k)
+    flist = filter(dont_scan, flist)
+    flist.sort()
+    return map(node.Entry, flist)