Add python implementation of consult's rblanche

This isn't complete yet, but it includes the key functionality and (for deeply
nested lists) is much faster. It also handles member lists that start with
hyphens.

Missing features include:
- auth support
- most of rblanche's options

diff --git a/rblanche.py b/rblanche.py
new file mode 100755 (executable)
index 0000000..10b0705
--- /dev/null
+++ b/rblanche.py
@@ -0,0 +1,47 @@
+#!/usr/bin/python
+import moira
+import sys
+
+cache = {}
+
+def get_members_of_list(lst):
+    return moira.query('get_members_of_list', lst)
+
+def expand(lst):
+    if lst in cache: return cache[lst]
+    try:
+        members = get_members_of_list(lst)
+    except moira.MoiraException, e:
+        code, message = e
+        if message == "Insufficient permission to perform requested database access":
+            cache[lst] = [{'member_type': 'ERR', 'member_name':'** Error: no permissions to look up this list **'}]
+            return cache[lst]
+        else: raise
+    for member in members:
+        if member['member_type'] == 'LIST':
+            member['members'] = expand(member['member_name'])
+    cache[lst] = members
+    return members
+
+def print_tree(path, lst_tree):
+    for member in lst_tree:
+        if 'members' in member:
+            path.append(member['member_name'])
+            print_tree(path, member['members'])
+            path.pop()
+        else:
+            if member['member_type'] == "USER":
+                text = member['member_name']
+            elif member['member_type'] == "ERR":
+                text = member['member_name']
+            else:
+                text = "%s:%s" % (member['member_type'], member['member_name'], )
+            print ":  ".join(path+[text])
+
+def rblanche(lst):
+    result = expand(lst)
+    print_tree([lst], result)
+
+if __name__ == '__main__':
+    moira.connect()
+    rblanche(sys.argv[1])