# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 1532554428 25200
# Node ID d2d03df3956f52e8651ce31f22489bf9d7d1d7da
# Parent  038cdaca714580f45f61a6845c8a9304f999d6a5
builddependencies: build inverse dict from forward dict

It's error-prone to keep "dependencies" and "rdependencies" in sync
(we don't do it correctly when there are multiple successors or a
node). It's easier to just create "rependencies" from "dependencies"
after it's complete.

diff -r 038cdaca7145 -r d2d03df3956f hgext3rd/evolve/utility.py
--- a/hgext3rd/evolve/utility.py	Wed Jul 25 14:21:49 2018 -0700
+++ b/hgext3rd/evolve/utility.py	Wed Jul 25 14:33:48 2018 -0700
@@ -92,8 +92,6 @@
     # dependencies = {3: [6], 6:[]}
     # Means that: 6 has no dependency, 3 depends on 6 to be solved
     dependencies = {}
-    # rdependencies is the inverted dict of dependencies
-    rdependencies = {r: set() for r in revs}
 
     for r in revs:
         dependencies[r] = set()
@@ -111,7 +109,13 @@
                 continue
             if succ in revs:
                 dependencies[r].add(succ)
-                rdependencies[succ].add(r)
+
+    # rdependencies is the inverted dict of dependencies
+    rdependencies = {r: set() for r in revs}
+    for r, deps in dependencies.items():
+        for dep in deps:
+            rdependencies[dep].add(r)
+
     return dependencies, rdependencies
 
 def _singlesuccessor(repo, p):