Missed from #20942.

[p5sagit/p5-mst-13.2.git] / lib / File / Compare.pm

diff --git a/lib/File/Compare.pm b/lib/File/Compare.pm
index 0ee84bd..0b73d7c 100644 (file)
--- a/lib/File/Compare.pm
+++ b/lib/File/Compare.pm
@@ -1,29 +1,26 @@
 package File::Compare;
 
+use 5.006;
 use strict;
-use vars qw($VERSION @ISA @EXPORT @EXPORT_OK $Too_Big *FROM *TO);
+use warnings;
+our($VERSION, @ISA, @EXPORT, @EXPORT_OK, $Too_Big);
 
 require Exporter;
 use Carp;
 
-$VERSION = '1.1002';
+$VERSION = '1.1003';
 @ISA = qw(Exporter);
 @EXPORT = qw(compare);
 @EXPORT_OK = qw(cmp compare_text);
 
 $Too_Big = 1024 * 1024 * 2;
 
-sub VERSION {
-    # Version of File::Compare
-    return $File::Compare::VERSION;
-}
-
 sub compare {
     croak("Usage: compare( file1, file2 [, buffersize]) ")
       unless(@_ == 2 || @_ == 3);
 
     my ($from,$to,$size) = @_;
-    my $text_mode = defined($size) && $size < 0;
+    my $text_mode = defined($size) && (ref($size) eq 'CODE' || $size < 0);
 
     my ($fromsize,$closefrom,$closeto);
     local (*FROM, *TO);
@@ -65,15 +62,19 @@ sub compare {
        local $/ = "\n";
        my ($fline,$tline);
        while (defined($fline = <FROM>)) {
-           unless (defined($tline = <TO>) && $fline eq $tline) {
-               goto fail_inner;
+           goto fail_inner unless defined($tline = <TO>);
+           if (ref $size) {
+               # $size contains ref to comparison function
+               goto fail_inner if &$size($fline, $tline);
+           } else {
+               goto fail_inner if $fline ne $tline;
            }
        }
        goto fail_inner if defined($tline = <TO>);
     }
     else {
        unless (defined($size) && $size > 0) {
-           $size = $fromsize;
+           $size = $fromsize || -s TO || 0;
            $size = 1024 if $size < 512;
            $size = $Too_Big if $size > $Too_Big;
        }
@@ -111,10 +112,20 @@ sub compare {
     return -1;
 }
 
+sub cmp;
 *cmp = \&compare;
 
-# Using a negative buffer size puts compare into text_mode
-sub compare_text { compare(@_[0..1], -1) }
+sub compare_text {
+    my ($from,$to,$cmp) = @_;
+    croak("Usage: compare_text( file1, file2 [, cmp-function])")
+       unless @_ == 2 || @_ == 3;
+    croak("Third arg to compare_text() function must be a code reference")
+       if @_ == 3 && ref($cmp) ne 'CODE';
+
+    # Using a negative buffer size puts compare into text_mode too
+    $cmp = -1 unless defined $cmp;
+    compare($from, $to, $cmp);
+}
 
 1;
 
@@ -142,12 +153,21 @@ File::Compare::cmp is a synonym for File::Compare::compare.  It is
 exported from File::Compare only by request.
 
 File::Compare::compare_text does a line by line comparison of the two
-files. It stops as soon as a difference is detected.
+files. It stops as soon as a difference is detected. compare_text()
+accepts an optional third argument: This must be a CODE reference to
+a line comparison function, which returns 0 when both lines are considered
+equal. For example:
+
+    compare_text($file1, $file2)
+
+is basically equivalent to
+
+    compare_text($file1, $file2, sub {$_[0] ne $_[1]} )
 
 =head1 RETURN
 
-File::Compare::compare return 0 if the files are equal, 1 if the
-files are unequal, or -1 if an error was encountered.
+File::Compare::compare and its sibling functions return 0 if the files
+are equal, 1 if the files are unequal, or -1 if an error was encountered.
 
 =head1 AUTHOR