Fixed some bugs in the builder

1 files changed, 14 insertions, 0 deletions

diff --git a/base/util.py b/base/util.py
index 5b68c3b..0d4723c 100644
--- a/base/util.py
+++ b/base/util.py
@@ -82,5 +82,19 @@ def one(l, f):
         if f(x):
             return x
 
+def isiter(i):
+    return hasattr(i, '__iter__')
+
+def flatten(l):
+    acc = []
+    def _flatten(acc, i):
+        if isiter(i):
+            for x in i:
+                _flatten(acc, x)
+        else:
+            acc.append(i)
+    _flatten(acc, l)
+    return acc
+
 __all__ = ['pwd', 'copy', 'with_sudo', 'with_su', 'symlink', 'move',
            'log_file', 'one']