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#!/usr/bin/env perl

# -------------------------------------------------------------------
# Copyright (C) 2002-2009 SQLFairy Authors
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307  USA
# -------------------------------------------------------------------

=head1 NAME 

sqlt-graph - Automatically create a graph from a database schema

=head1 SYNOPSIS

  ./sqlt-graph -d|--db|-f|--from=db_parser [options] schema.sql

  Options:

    -l|--layout        Layout schema for GraphViz
                       ("dot," "neato," "twopi"; default "dot")
    -n|--node-shape    Shape of the nodes ("record," "plaintext," 
                       "ellipse," "circle," "egg," "triangle," "box," 
                       "diamond," "trapezium," "parallelogram," "house," 
                       "hexagon," "octagon," default "record")
    -o|--output        Output file name (default STDOUT)
    -t|--output-type   Output file type ("canon", "text," "ps," "hpgl,"
                       "pcl," "mif," "pic," "gd," "gd2," "gif," "jpeg,"
                       "png," "wbmp," "cmap," "ismap," "imap," "vrml,"
                       "vtx," "mp," "fig," "svg," "plain," default "png")
    -c|--color         Add colors
    --cluster          Cluster tables
    --no-fields        Don't show field names
    --height           Image height (in inches, default "11",
                       set to "0" to undefine)
    --width            Image width (in inches, default "8.5", 
                       set to "0" to undefine)
    --fontsize         custom font size for node and edge labels
    --fontname         name of custom font (or full path to font file) for 
                       node, edge, and graph labels
    --nodeattr         attribute name and value (in key=val syntax) for
                       nodes; this option may be repeated to specify 
                       multiple node attributes
    --edgeattr         same as --nodeattr, but for edge attributes
    --graphattr        same as --nodeattr, but for graph attributes
    --natural-join     Perform natural joins
    --natural-join-pk  Perform natural joins from primary keys only
    --show-datatypes   Show datatype of each field
    --show-sizes       Show column sizes for VARCHAR and CHAR fields
    --show-constraints Show list of constraints for each field
    -s|--skip          Fields to skip in natural joins
    --skip-tables      Comma-separated list of table names to exclude 
    --skip-tables-like Comma-separated list of regexen to exclude tables
    --debug            Print debugging information

=head1 DESCRIPTION

This script will create a graph of your schema.  Only the database
driver argument (for SQL::Translator) is required.  If no output file
name is given, then image will be printed to STDOUT, so you should
redirect the output into a file.

The default action is to assume the presence of foreign key
relationships defined via "REFERNCES" or "FOREIGN KEY" constraints on
the tables.  If you are parsing the schema of a file that does not
have these, you will find the natural join options helpful.  With
natural joins, like-named fields will be considered foreign keys.
This can prove too permissive, however, as you probably don't want a
field called "name" to be considered a foreign key, so you could
include it in the "skip" option, and all fields called "name" will be
excluded from natural joins.  A more efficient method, however, might
be to simply deduce the foriegn keys from primary keys to other fields
named the same in other tables.  Use the "natural-join-pk" option
to acheive this.

If the schema defines foreign keys, then the graph produced will be
directed showing the direction of the relationship.  If the foreign
keys are intuited via natural joins, the graph will be undirected.

Clustering of tables allows you to group and box tables according to 
function or domain or whatever criteria you choose.  The syntax for 
clustering tables is:

  cluster1=table1,table2;cluster2=table3,table4

=cut

# -------------------------------------------------------------------

use strict;
use warnings;
use Data::Dumper;
use Getopt::Long;
use GraphViz;
use Pod::Usage;
use SQL::Translator;

use vars '$VERSION';
$VERSION = '1.59';

#
# Get arguments.
#
my ( 
    $layout, $node_shape, $out_file, $output_type, $db_driver, $add_color, 
    $natural_join, $join_pk_only, $skip_fields, $show_datatypes,
    $show_sizes, $show_constraints, $debug, $help, $height, $width,
    $no_fields, $fontsize, $fontname, $skip_tables, $skip_tables_like,
    $cluster
);

# multi-valued options:
my %edgeattrs = ();
my %nodeattrs = ();
my %graphattrs = ();

GetOptions(
    'd|db|f|from=s'      => \$db_driver,
    'o|output:s'         => \$out_file,
    'l|layout:s'         => \$layout,
    'n|node-shape:s'     => \$node_shape,
    't|output-type:s'    => \$output_type,
    'height:f'           => \$height,
    'width:f'            => \$width,
    'fontsize=i'         => \$fontsize,
    'fontname=s'         => \$fontname,
    'nodeattr=s'         => \%nodeattrs,
    'edgeattr=s'         => \%edgeattrs,
    'graphattr=s'        => \%graphattrs,
    'c|color'            => \$add_color,
    'cluster:s'          => \$cluster,
    'no-fields'          => \$no_fields,
    'natural-join'       => \$natural_join,
    'natural-join-pk'    => \$join_pk_only,
    's|skip:s'           => \$skip_fields,
    'skip-tables:s'      => \$skip_tables,
    'skip-tables-like:s' => \$skip_tables_like,
    'show-datatypes'     => \$show_datatypes,
    'show-sizes'         => \$show_sizes,
    'show-constraints'   => \$show_constraints,
    'debug'              => \$debug,
    'h|help'             => \$help,
) or die pod2usage;
my @files = @ARGV; # the create script(s) for the original db

pod2usage(1) if $help;
pod2usage( -message => "No db driver specified" ) unless $db_driver;
pod2usage( -message => 'No input file'          ) unless @files;

my $translator           =  SQL::Translator->new( 
    from                 => $db_driver,
    to                   => 'GraphViz',
    debug                => $debug || 0,
    producer_args        => {
        out_file         => $out_file,
        layout           => $layout,
        node_shape       => $node_shape,
        output_type      => $output_type,
        add_color        => $add_color,
        natural_join     => $natural_join,
        natural_join_pk  => $join_pk_only,
        skip_fields      => $skip_fields,
        skip_tables      => $skip_tables,
        skip_tables_like => $skip_tables_like,
        show_datatypes   => $show_datatypes,
        show_sizes       => $show_sizes,
        show_constraints => $show_constraints,
        cluster          => $cluster,
        height           => $height || 0,
        width            => $width  || 0,
        fontsize         => $fontsize,
        fontname         => $fontname,
        nodeattrs        => \%nodeattrs,
        edgeattrs        => \%edgeattrs,
        graphattrs       => \%graphattrs,
        show_fields      => $no_fields ? 0 : 1,
    },
) or die SQL::Translator->error;

for my $file (@files) {
    my $output = $translator->translate( $file ) or die
                 "Error: " . $translator->error;
    if ( $out_file ) {
        print "Image written to '$out_file'.  Done.\n";
    }
    else {
        print $output;
    }
}

# -------------------------------------------------------------------

=pod

=head1 AUTHOR

Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>.

=head1 SEE ALSO

perl, SQL::Translator.

=cut