new script to convert sql schema files into graphviz dot

scripts/sql-to-dot.sed

@@ -0,0 +1,25 @@
+#! /bin/sed -f
+1idigraph schema {
+
+# remove newlines
+:a;N;$!ba;s/\n/ /g
+
+s| *CREATE TABLE[^("'`]*[`"']\?\([a-z]\+\)[`"']\? *|\n    \1\n        [shape=none, margin=0, label=<\n            <table>\n                <tr><td colspan="3"><b>\1</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
+
+s| *COMMENT *= *[`"']\?\([^`"']*\)[`"']\?|                <tr><td colspan="3">\1</td></tr>|ig
+
+s| *[`"']\([a-z]\+\)[`"'] *\([^,)]*\) *COMMENT *[`"']\([^`"']*\)[`"'] *[,)]|                <tr><td port="\1">\1</td><td>\2</td><td>\3</td></tr>\n|ig
+
+s/ *ENGINE *= *\w* *//ig
+s/ *DEFAULT *CHARSET *= *\w* *//ig
+s/ *CHARACTER *SET *=\? *\w* *//ig
+s|;|\n            </table>\n        >];\n|ig
+s/(//ig
+
+$a}