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