#! /bin/sed -f
1i\
/** @page database Database Schema\
\
@dot\
digraph schema {

# remove newlines
:a;N;$!ba;s/\n/ /g
# reduce spaces
s, \+, ,g

s| *CREATE *TABLE *\(if *not *exists\)\? *`\?\([a-z]\+\)`\? *|\n    \2\n        [shape=none, margin=0, label=<\n            <table bgcolor="#dddddd">\n                <tr><td bgcolor="#ddddff" colspan="4"><b>\2</b></td></tr>\n|ig

s/varchar *( *\([0-9]\+\) *)/varchar[\1]/ig

s/ *PRIMARY KEY *( *`\?\([a-z]\+\)`\? *) *[,)]//ig

:b;s/\([a-z]\+\)\([^;]*\)FOREIGN KEY *( *`\?\([a-z]\+\)`\? *) *REFERENCES *`\?\([a-z]\+\)`\? *( *`\?\([a-z]\+\)`\? *) *\([^,)]*\)[,)]\(.*\)/\1\2\7\n \1:\3 -> \4:\5/ig;tb

:c;s|\n[(,] *`\?\([a-z]\+\)`\? *\([^ ]\+\)*\([^,)]*\) *COMMENT *[`"']\([^`"']*\)[`"'] *[,)]|\n                <tr><td align="left" port="\1"><b>\1</b></td><td align="left">\2</td><td align="left">\3</td><td align="left">\4</td></tr>\n,|ig;tc

s| \+</td>|</td>|g
s|<td> \+|<td>|g
s|\(<td[^>]*>[^<]\{30,40\}\) \+\([^<]\{20,\}</td>\)|\1<br/>\2|g
:d;s|\(<br/>[^<]\{30,40\}\) \+\([^<]\{20,\}</td>\)|\1<br/>\2|g;td

s| *COMMENT *= *["']\?\([^"']*\)["']\?|\n                <tr><td bgcolor="#ddddff" colspan="4">\1</td></tr>|ig

s| \+</td>|</td>|g
s|<td> \+|<td>|g
s|\(<td[^>]*>[^<]\{60,80\}\) \+\([^<]\{30,\}</td>\)|\1<br/>\2|g
:e;s|\(<br/>[^<]\{60,80\}\) \+\([^<]\{30,\}</td>\)|\1<br/>\2|g;te

s/\n,[^\n]*/\n/g
s|;|\n            </table>\n        >];\n|ig

$a\
}\
@enddot\
*/