1 files changed, 102 insertions, 0 deletions
diff --git a/third_party/python/gyp/tools/graphviz.py b/third_party/python/gyp/tools/graphviz.py
new file mode 100755
index 0000000000..538b059da4
--- /dev/null
+++ b/third_party/python/gyp/tools/graphviz.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2011 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Using the JSON dumped by the dump-dependency-json generator,
+generate input suitable for graphviz to render a dependency graph of
+targets."""
+
+from __future__ import print_function
+
+import collections
+import json
+import sys
+
+
+def ParseTarget(target):
+  target, _, suffix = target.partition('#')
+  filename, _, target = target.partition(':')
+  return filename, target, suffix
+
+
+def LoadEdges(filename, targets):
+  """Load the edges map from the dump file, and filter it to only
+  show targets in |targets| and their depedendents."""
+
+  file = open('dump.json')
+  edges = json.load(file)
+  file.close()
+
+  # Copy out only the edges we're interested in from the full edge list.
+  target_edges = {}
+  to_visit = targets[:]
+  while to_visit:
+    src = to_visit.pop()
+    if src in target_edges:
+      continue
+    target_edges[src] = edges[src]
+    to_visit.extend(edges[src])
+
+  return target_edges
+
+
+def WriteGraph(edges):
+  """Print a graphviz graph to stdout.
+  |edges| is a map of target to a list of other targets it depends on."""
+
+  # Bucket targets by file.
+  files = collections.defaultdict(list)
+  for src, dst in edges.items():
+    build_file, target_name, toolset = ParseTarget(src)
+    files[build_file].append(src)
+
+  print('digraph D {')
+  print('  fontsize=8')  # Used by subgraphs.
+  print('  node [fontsize=8]')
+
+  # Output nodes by file.  We must first write out each node within
+  # its file grouping before writing out any edges that may refer
+  # to those nodes.
+  for filename, targets in files.items():
+    if len(targets) == 1:
+      # If there's only one node for this file, simplify
+      # the display by making it a box without an internal node.
+      target = targets[0]
+      build_file, target_name, toolset = ParseTarget(target)
+      print('  "%s" [shape=box, label="%s\\n%s"]' % (target, filename,
+                                                     target_name))
+    else:
+      # Group multiple nodes together in a subgraph.
+      print('  subgraph "cluster_%s" {' % filename)
+      print('    label = "%s"' % filename)
+      for target in targets:
+        build_file, target_name, toolset = ParseTarget(target)
+        print('    "%s" [label="%s"]' % (target, target_name))
+      print('  }')
+
+  # Now that we've placed all the nodes within subgraphs, output all
+  # the edges between nodes.
+  for src, dsts in edges.items():
+    for dst in dsts:
+      print('  "%s" -> "%s"' % (src, dst))
+
+  print('}')
+
+
+def main():
+  if len(sys.argv) < 2:
+    print(__doc__, file=sys.stderr)
+    print(file=sys.stderr)
+    print('usage: %s target1 target2...' % (sys.argv[0]), file=sys.stderr)
+    return 1
+
+  edges = LoadEdges('dump.json', sys.argv[1:])
+
+  WriteGraph(edges)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())