[21711] | 1 | #!/usr/bin/perl -w
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| 2 | # diffs two files and writes an HTML output file.
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| 3 | use strict;
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| 4 | use CGI qw(:standard :html3);
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| 5 | use Algorithm::Diff 'traverse_sequences';
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| 6 | use Text::Tabs;
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| 7 |
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| 8 | my ( @a, @b );
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| 9 |
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| 10 | # Take care of whitespace.
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| 11 | sub preprocess
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| 12 | {
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| 13 | my $arrayRef = shift;
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| 14 | chomp(@$arrayRef);
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| 15 | @$arrayRef = expand(@$arrayRef);
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| 16 | }
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| 17 |
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| 18 | # This will be called with both lines are the same
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| 19 | sub match
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| 20 | {
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| 21 | my ( $ia, $ib ) = @_;
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| 22 | print pre( $a[$ia] ), "\n";
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| 23 | }
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| 24 |
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| 25 | # This will be called when there is a line in A that isn't in B
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| 26 | sub only_a
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| 27 | {
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| 28 | my ( $ia, $ib ) = @_;
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| 29 | print pre( { -class => 'onlyA' }, $a[$ia] ), "\n";
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| 30 | }
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| 31 |
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| 32 | # This will be called when there is a line in B that isn't in A
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| 33 | sub only_b
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| 34 | {
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| 35 | my ( $ia, $ib ) = @_;
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| 36 | print pre( { -class => 'onlyB' }, $b[$ib] ), "\n";
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| 37 | }
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| 38 |
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| 39 | # MAIN PROGRAM
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| 40 |
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| 41 | # Check for two arguments.
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| 42 | print "usage: $0 file1 file2 > diff.html\n" if @ARGV != 2;
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| 43 |
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| 44 | $tabstop = 4; # For Text::Tabs
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| 45 |
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| 46 | # Read each file into an array.
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| 47 | open FH, $ARGV[0];
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| 48 | @a = <FH>;
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| 49 | close FH;
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| 50 |
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| 51 | open FH, $ARGV[1];
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| 52 | @b = <FH>;
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| 53 | close FH;
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| 54 |
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| 55 | # Expand whitespace
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| 56 | preprocess( \@a );
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| 57 | preprocess( \@b );
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| 58 |
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| 59 | # inline style
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| 60 | my $style = <<EOS;
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| 61 | PRE {
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| 62 | margin-left: 24pt;
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| 63 | font-size: 12pt;
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| 64 | font-family: Courier, monospaced;
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| 65 | white-space: pre
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| 66 | }
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| 67 | PRE.onlyA { color: red }
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| 68 | PRE.onlyB { color: blue }
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| 69 | EOS
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| 70 |
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| 71 | # Print out the starting HTML
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| 72 | print
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| 73 |
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| 74 | # header(),
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| 75 | start_html(
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| 76 | {
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| 77 | -title => "$ARGV[0] vs. $ARGV[1]",
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| 78 | -style => { -code => $style }
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| 79 | }
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| 80 | ),
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| 81 | h1(
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| 82 | { -style => 'margin-left: 24pt' },
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| 83 | span( { -style => 'color: red' }, $ARGV[0] ),
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| 84 | span(" <i>vs.</i> "),
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| 85 | span( { -style => 'color: blue' }, $ARGV[1] )
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| 86 | ),
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| 87 | "\n";
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| 88 |
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| 89 | # And compare the arrays
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| 90 | traverse_sequences(
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| 91 | \@a, # first sequence
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| 92 | \@b, # second sequence
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| 93 | {
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| 94 | MATCH => \&match, # callback on identical lines
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| 95 | DISCARD_A => \&only_a, # callback on A-only
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| 96 | DISCARD_B => \&only_b, # callback on B-only
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| 97 | }
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| 98 | );
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| 99 |
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| 100 | print end_html();
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