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[auf_roundup.git] / scripts / schema_diagram.py
1 #! /usr/bin/python
2 #
3 # Schema diagram generator contributed by Stefan Seefeld of the fresco
4 # project http://www.fresco.org/.
5 #
6 # It generates a 'dot file' that is then fed into the 'dot'
7 # tool (http://www.graphviz.org) to generate a graph:
8 #
9 # %> ./schema.py
10 # %> dot -Tps schema.dot -o schema.ps
11 # %> gv schema.ps
12 #
13 import sys
14 import roundup.instance
15
16 # open the instance
17 instance = roundup.instance.open(sys.argv[1])
18 db = instance.open()
19
20 # diagram preamble
21 print 'digraph schema {'
22 print 'size="8,6"'
23 print 'node [shape="record" bgcolor="#ffe4c4" style=filled]'
24 print 'edge [taillabel="1" headlabel="1" dir=back arrowtail=ediamond]'
25
26 # get all the classes
27 types = db.classes.keys()
28
29 # one record node per class
30 for i in range(len(types)):
31 print 'node%d [label=\"{%s|}"]'%(i, types[i])
32
33 # now draw in the relations
34 for name in db.classes.keys():
35 type = db.classes[name]
36 attributes = type.getprops()
37 for a in attributes.keys():
38 attribute = attributes[a]
39 if isinstance(attribute, roundup.hyperdb.Link):
40 print 'node%d -> node%d [label=%s]'%(types.index(name),
41 types.index(attribute.classname),
42 a)
43 elif isinstance(attribute, roundup.hyperdb.Multilink):
44 print 'node%d -> node%d [taillabel="*" label=%s]'%(types.index(name),
45 types.index(attribute.classname),
46 a)
47 # all done
48 print '}'