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#!/usr/bin/perl

use File::Basename;

use File::Copy;

#setup

#location of imagemagick compare binary

my $compare = "/usr/bin/compare";

#location of eagle binary

my $eagle = "/usr/bin/eagle";

#where to store temporary files

my $tmpdir = "/tmp";

#the dpi parameter to send to eagle for generating images

my $brdresolution = 1000;

my $schresolution = 200;

#store the resulting images at the path of argument 1 or 2

my $storeresult=2;

#name of eagle script file, will be created

my $eaglecommands=$tmpdir."/eaglecmd";

#check number of arguments, must be 2

my $argcount = @ARGV;

unless ($argcount eq "2") {

        print "Syntax: perl eagle-compare <file1> <file2>\n";

        exit;

}

#read arguments and find file suffix

my $file1 = $ARGV[0];

my $file2 = $ARGV[1];

my(undef, undef, $suffix1) = fileparse($file1,qr"\..*");

my(undef, undef, $suffix2) = fileparse($file2,qr"\..*");

#check that files exists

unless (-e $file1)

  {

    print "File '$file1' does not exist.\n";

    exit;

  }

unless (-e $file2)

  {

    print "File '$file2' does not exist.\n";

    exit;

  }

#check that both files have the same suffix

unless ($suffix1 eq $suffix2)

  {

    print "File '$file1' does not have the same file type as '$file2'.\n";

    exit;

  }

#check that suffix is a supported one

unless (($suffix1 eq ".brd") || ($suffix1 eq ".sch"))

  {

    print "Only .brd and .sch are supported.\n";

    exit;

  }

my $storedir=$tmpdir;

if ($storeresult == 1)

{

    $storedir = dirname($file1);

}

if ($storeresult == 2)

{

    $storedir = dirname($file2);

}

#create a file name random, the file names will be too long if they are created with the path

$file1unique = $tmpdir."/".generate_random_string(8).$suffix1;

$file2unique = $tmpdir."/".generate_random_string(8).$suffix1;

#copy files to temp area

copy($file1, $file1unique);

copy($file2, $file2unique);

#if suffix is a layout file

if ($suffix1 eq ".brd")

{

    #create eagle script file for first file argument

    open (MYFILE,">".$eaglecommands);

    print MYFILE "SET VECTOR_FONT ON\n";

    print MYFILE "DISPLAY ALL\n";

    print MYFILE "RIPUP @\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 1\n";

    print MYFILE "EXPORT IMAGE ".$file1unique.".1.png ".$brdresolution."\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 2\n";

    print MYFILE "EXPORT IMAGE ".$file1unique.".2.png ".$brdresolution."\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 15\n";

    print MYFILE "EXPORT IMAGE ".$file1unique.".15.png ".$brdresolution."\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 16\n";

    print MYFILE "EXPORT IMAGE ".$file1unique.".16.png ".$brdresolution."\n";

    print MYFILE "QUIT\n";

    close (MYFILE);

    #run eagle with the first layout file and the created script file as arguments

    #this will create 4 png files in the temp dir

    system ($eagle, $file1unique, "-S", $eaglecommands);

    #create eagle script file for second file argument

    open (MYFILE,">".$eaglecommands);

    print MYFILE "SET VECTOR_FONT ON\n";

    print MYFILE "DISPLAY ALL\n";

    print MYFILE "RIPUP @\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 1\n";

    print MYFILE "EXPORT IMAGE ".$file2unique.".1.png ".$brdresolution."\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 2\n";

    print MYFILE "EXPORT IMAGE ".$file2unique.".2.png ".$brdresolution."\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 15\n";

    print MYFILE "EXPORT IMAGE ".$file2unique.".15.png ".$brdresolution."\n";

    print MYFILE "DISPLAY NONE 17 18 ?? 16\n";

    print MYFILE "EXPORT IMAGE ".$file2unique.".16.png ".$brdresolution."\n";

    print MYFILE "QUIT\n";

    close (MYFILE);

    #run eagle with the second layout file and the created script file as arguments

    #this will create 4 png files in the temp dir

    system ($eagle, $file2unique, "-S", $eaglecommands);

    #compare each png file for the first file argument and the second file argument

    #the resulting compared images will be stored from where the script is run

    system ($compare, $file1unique.".1.png", $file2unique.".1.png", $storedir."/eagle-diff-brd-layer1.png");

    system ($compare, $file1unique.".2.png", $file2unique.".2.png", $storedir."/eagle-diff-brd-layer2.png");

    system ($compare, $file1unique.".15.png", $file2unique.".15.png", $storedir."/eagle-diff-brd-layer15.png");

    system ($compare, $file1unique.".16.png", $file2unique.".16.png", $storedir."/eagle-diff-brd-layer16.png");

    #remove all intermediate files

    unlink($file1unique.".1.png");

    unlink($file1unique.".2.png");

    unlink($file1unique.".15.png");

    unlink($file1unique.".16.png");

    unlink($file2unique.".1.png");

    unlink($file2unique.".2.png");

    unlink($file2unique.".15.png");

    unlink($file2unique.".16.png");

    unlink($eaglecommands);

}

if ($suffix1 eq ".sch")

{

    #create eagle script file for first file argument

    open (MYFILE,">".$eaglecommands);

    #print MYFILE "SET VECTOR_FONT ON\n";   # causes a save-dialog-box if not already persistent in this drawing

    print MYFILE "DISPLAY NONE 91 92 94 95 96 97 98\n";

    print MYFILE "EXPORT IMAGE ".$file1unique.".png ".$schresolution."\n";

    print MYFILE "QUIT\n";

    close (MYFILE);

    #run eagle with the first schematic file and the created script file as arguments

    #this will create one png file in the temp dir

    system ($eagle, $file1unique, "-S", $eaglecommands);

    #create eagle script file for second file argument

    open (MYFILE,">".$eaglecommands);

    #print MYFILE "SET VECTOR_FONT ON\n";   # causes a save-dialog-box if not already persistent in this drawing

    print MYFILE "DISPLAY NONE 91 92 94 95 96 97 98\n";

    print MYFILE "EXPORT IMAGE ".$file2unique.".png ".$schresolution."\n";

    print MYFILE "QUIT\n";

    close (MYFILE);

    #run eagle with the second schematic file and the created script file as arguments

    #this will create one png file in the temp dir

    system ($eagle, $file2unique, "-S", $eaglecommands);

    #compare png file for the first file argument and the second file argument

    #the resulting compared image will be stored from where the script is run

    system ($compare, $file1unique.".png", $file2unique.".png", $storedir."/eagle-diff-sch.png");

    #remove all intermediate files

    unlink($file1unique.".png");

    unlink($file2unique.".png");

    unlink($eaglecommands);

}

unlink($file1unique);

unlink($file2unique);

# This function generates random strings of a given length

sub generate_random_string

{

    my $length_of_randomstring=shift;# the length of 

             # the random string to generate

    my @chars=('a'..'z','A'..'Z','0'..'9','_');

    my $random_string;

    foreach (1..$length_of_randomstring)

    {

        # rand @chars will generate a random 

        # number between 0 and scalar @chars

        $random_string.=$chars[rand @chars];

    }

    return $random_string;

}