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annotate scripts/schema_diagram.py @ 2089:93f03c6714d8

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A few big changes in this commit: 1. The current indexer has been moved to backends/indexer_dbm in anticipation of my writing an indexer_rdbms, 2. Changed indexer invocation during create / set to follow the pattern set by the metakit backend, which was much cleaner, and 3. The "content" property of FileClass is now mutable in all but the metakit backend. Metakit needs to be changed to support the editing of "content". Hey, and I learnt today that the metakit backend implements its own indexer. How about that... :)
author Richard Jones <richard@users.sourceforge.net>
date Fri, 19 Mar 2004 04:47:59 +0000
parents d56b7fc64923
children 64b05e24dbd8
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1 #! /usr/bin/python
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2 #
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3 # Schema diagram generator contributed by Stefan Seefeld of the fresco
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4 # project http://www.fresco.org/.
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5 #
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6 # It generates a 'dot file' that is then fed into the 'dot'
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7 # tool (http://www.graphviz.org) to generate a graph:
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8 #
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9 # %> ./schema.py
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10 # %> dot -Tps schema.dot -o schema.ps
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11 # %> gv schema.ps
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12 #
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13 import sys
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14 import roundup.instance
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15
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16 # open the instance
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17 instance = roundup.instance.open(sys.argv[1])
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18 db = instance.open()
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19
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20 # diagram preamble
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21 print 'digraph schema {'
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22 print 'size="8,6"'
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23 print 'node [shape="record" bgcolor="#ffe4c4" style=filled]'
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24 print 'edge [taillabel="1" headlabel="1" dir=back arrowtail=ediamond]'
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25
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26 # get all the classes
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27 types = db.classes.keys()
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28
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29 # one record node per class
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30 for i in range(len(types)):
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31 print 'node%d [label=\"{%s|}"]'%(i, types[i])
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32
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33 # now draw in the relations
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34 for name in db.classes.keys():
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35 type = db.classes[name]
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36 attributes = type.getprops()
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37 for a in attributes.keys():
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38 attribute = attributes[a]
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39 if isinstance(attribute, roundup.hyperdb.Link):
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40 print 'node%d -> node%d [label=%s]'%(types.index(name),
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41 types.index(attribute.classname),
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42 a)
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43 elif isinstance(attribute, roundup.hyperdb.Multilink):
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44 print 'node%d -> node%d [taillabel="*" label=%s]'%(types.index(name),
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45 types.index(attribute.classname),
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46 a)
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47 # all done
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48 print '}'
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