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