[Koha-patches] [PATCH] Bug 7345: Enable exporting records sans private fields

[Jared Camins-Esakov]

Add an option for marcstd to the opac-export.pl and catalogue/export.pl
scripts. This new format removes all 9XX, X9X, XX9 fields and subfield $9
(with the exception of 490 in flavours of MARC other than UNIMARC). The work is
done in C4::Record::marc2marc.

Testing plan:
1. Export a record in "MARC (Unicode/UTF-8)" format as a control
2. In the OPAC, run the following jQuery to add the marcstd option to the UI:
> $("#export #format").append("<option value='marcstd'>MARC (no 9xx)</option>");
3. Export the same record in "MARC (no 9xx)" format
4. Compare the two, noticing that any subfield $9 or fields including 9 (other
   than 490 in flavours of MARC other than UNIMARC) have been removed
---
 C4/Record.pm        |   27 ++++++++++++++++++++++++++-
 catalogue/export.pl |    4 ++++
 opac/opac-export.pl |    4 ++++
 3 files changed, 34 insertions(+), 1 deletions(-)

diff --git a/C4/Record.pm b/C4/Record.pm
index cecb6ed..9c55abb 100644
--- a/C4/Record.pm
+++ b/C4/Record.pm
@@ -77,7 +77,32 @@ Returns an ISO-2709 scalar
 
 sub marc2marc {
 	my ($marc,$to_flavour,$from_flavour,$encoding) = @_;
-	my $error = "Feature not yet implemented\n";
+	my $error;
+    if ($to_flavour =~ m/marcstd/) {
+        my $marc_record_obj;
+        if ($marc =~ /^MARC::Record/) { # it's already a MARC::Record object
+            $marc_record_obj = $marc;
+        } else { # it's not a MARC::Record object, make it one
+            eval { $marc_record_obj = MARC::Record->new_from_usmarc($marc) }; # handle exceptions
+
+# conversion to MARC::Record object failed, populate $error
+                if ($@) { $error .="\nCreation of MARC::Record object failed: ".$MARC::File::ERROR };
+        }
+        unless ($error) {
+            my @privatefields;
+            foreach my $field ($marc_record_obj->fields()) {
+                if ($field->tag() =~ m/9/ && ($field->tag() != '490' || C4::Context->preference("marcflavour") eq 'UNIMARC')) {
+                    push @privatefields, $field;
+                } elsif (! ($field->is_control_field())) {
+                    $field->delete_subfield(code => '9') if ($field->subfield('9'));
+                }
+            }
+            $marc_record_obj->delete_field(@privatefields);
+            $marc = $marc_record_obj->as_usmarc();
+        }
+    } else {
+        $error = "Feature not yet implemented\n";
+    }
 	return ($error,$marc);
 }
 
diff --git a/catalogue/export.pl b/catalogue/export.pl
index 2b55d9f..db69af9 100755
--- a/catalogue/export.pl
+++ b/catalogue/export.pl
@@ -51,6 +51,10 @@ if ($op eq "export") {
 				C4::Charset::SetUTF8Flag($marc, 1);
 				$marc = $marc->as_usmarc();
 			}
+            elsif ($format =~ /marcstd/) {
+                C4::Charset::SetUTF8Flag($marc,1);
+                ($error,$marc) = marc2marc($marc, 'marcstd', C4::Context->preference('marcflavour'));
+            }
 			print $query->header(
 				-type => 'application/octet-stream',
                 -attachment=>"bib-$biblionumber.$format");
diff --git a/opac/opac-export.pl b/opac/opac-export.pl
index 411fd3f..fb8dee7 100755
--- a/opac/opac-export.pl
+++ b/opac/opac-export.pl
@@ -66,6 +66,10 @@ elsif ($format =~ /utf8/) {
     C4::Charset::SetUTF8Flag($marc,1);
     $marc = $marc->as_usmarc();
 }
+elsif ($format =~ /marcstd/) {
+    C4::Charset::SetUTF8Flag($marc,1);
+    ($error,$marc) = marc2marc($marc, 'marcstd', C4::Context->preference('marcflavour'));
+}
 else {
     $error= "Format $format is not supported.";
 }
-- 
1.7.2.5