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Filename :
graphviz.py
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#! /usr/bin/python2 # 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())