Bug 343814: Move PatchReader specific code into a separate module - Patch by…

Bugzilla/Attachment/PatchReader.pm

+# -*- Mode: perl; indent-tabs-mode: nil -*-
+#
+# The contents of this file are subject to the Mozilla Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/MPL/
+#
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+#
+# The Original Code is the Bugzilla Bug Tracking System.
+#
+# Contributor(s): John Keiser <john@johnkeiser.com>
+#                 Frédéric Buclin <LpSolit@gmail.com>
+
+use strict;
+
+package Bugzilla::Attachment::PatchReader;
+
+use Bugzilla::Config qw(:localconfig);
+use Bugzilla::Error;
+
+
+sub process_diff {
+    my ($attachment, $format, $context) = @_;
+    my $dbh = Bugzilla->dbh;
+    my $cgi = Bugzilla->cgi;
+    my $vars = {};
+
+    my ($reader, $last_reader) = setup_patch_readers(undef, $context);
+
+    if ($format eq 'raw') {
+        require PatchReader::DiffPrinter::raw;
+        $last_reader->sends_data_to(new PatchReader::DiffPrinter::raw());
+        # Actually print out the patch.
+        print $cgi->header(-type => 'text/plain',
+                           -expires => '+3M');
+
+        $reader->iterate_string('Attachment ' . $attachment->id, $attachment->data);
+    }
+    else {
+        $vars->{'other_patches'} = [];
+        if ($interdiffbin && $diffpath) {
+            # Get list of attachments on this bug.
+            # Ignore the current patch, but select the one right before it
+            # chronologically.
+            my $attachment_list =
+                $dbh->selectall_arrayref('SELECT attach_id, description
+                                            FROM attachments
+                                           WHERE bug_id = ?
+                                             AND ispatch = 1
+                                        ORDER BY creation_ts DESC',
+                                          undef, $attachment->bug_id);
+
+            my $select_next_patch = 0;
+            foreach (@$attachment_list) {
+                my ($other_id, $other_desc) = @$_;
+                if ($other_id == $attachment->id) {
+                    $select_next_patch = 1;
+                }
+                else {
+                    push(@{$vars->{'other_patches'}}, {'id'       => $other_id,
+                                                       'desc'     => $other_desc,
+                                                       'selected' => $select_next_patch});
+                    if ($select_next_patch) {
+                      $select_next_patch = 0;
+                    }
+                }
+            }
+        }
+
+        $vars->{'bugid'} = $attachment->bug_id;
+        $vars->{'attachid'} = $attachment->id;
+        $vars->{'description'} = $attachment->description;
+
+        setup_template_patch_reader($last_reader, $format, $context, $vars);
+        # Actually print out the patch.
+        $reader->iterate_string('Attachment ' . $attachment->id, $attachment->data);
+    }
+}
+
+sub process_interdiff {
+    my ($old_attachment, $new_attachment, $format, $context) = @_;
+    my $cgi = Bugzilla->cgi;
+    my $vars = {};
+
+    # Get old patch data.
+    my ($old_filename, $old_file_list) = get_unified_diff($old_attachment);
+    # Get new patch data.
+    my ($new_filename, $new_file_list) = get_unified_diff($new_attachment);
+
+    my $warning = warn_if_interdiff_might_fail($old_file_list, $new_file_list);
+
+    # Send through interdiff, send output directly to template.
+    # Must hack path so that interdiff will work.
+    $ENV{'PATH'} = $diffpath;
+    open my $interdiff_fh, "$interdiffbin $old_filename $new_filename|";
+    binmode $interdiff_fh;
+    my ($reader, $last_reader) = setup_patch_readers("", $context);
+
+    if ($format eq 'raw') {
+        require PatchReader::DiffPrinter::raw;
+        $last_reader->sends_data_to(new PatchReader::DiffPrinter::raw());
+        # Actually print out the patch.
+        print $cgi->header(-type => 'text/plain',
+                           -expires => '+3M');
+    }
+    else {
+        $vars->{'warning'} = $warning if $warning;
+        $vars->{'bugid'} = $new_attachment->bug_id;
+        $vars->{'oldid'} = $old_attachment->id;
+        $vars->{'old_desc'} = $old_attachment->description;
+        $vars->{'newid'} = $new_attachment->id;
+        $vars->{'new_desc'} = $new_attachment->description;
+
+        setup_template_patch_reader($last_reader, $format, $context, $vars);
+    }
+    $reader->iterate_fh($interdiff_fh, 'interdiff #' . $old_attachment->id .
+                        ' #' . $new_attachment->id);
+    close $interdiff_fh;
+    $ENV{'PATH'} = '';
+
+    # Delete temporary files.
+    unlink($old_filename) or warn "Could not unlink $old_filename: $!";
+    unlink($new_filename) or warn "Could not unlink $new_filename: $!";
+}
+
+######################
+#  Internal routines
+######################
+
+sub get_unified_diff {
+    my $attachment = shift;
+
+    # Bring in the modules we need.
+    require PatchReader::Raw;
+    require PatchReader::FixPatchRoot;
+    require PatchReader::DiffPrinter::raw;
+    require PatchReader::PatchInfoGrabber;
+    require File::Temp;
+
+    $attachment->ispatch
+      || ThrowCodeError('must_be_patch', { 'attach_id' => $attachment->id });
+
+    # Reads in the patch, converting to unified diff in a temp file.
+    my $reader = new PatchReader::Raw;
+    my $last_reader = $reader;
+
+    # Fixes patch root (makes canonical if possible).
+    if (Bugzilla->params->{'cvsroot'}) {
+        my $fix_patch_root =
+            new PatchReader::FixPatchRoot(Bugzilla->params->{'cvsroot'});
+        $last_reader->sends_data_to($fix_patch_root);
+        $last_reader = $fix_patch_root;
+    }
+
+    # Grabs the patch file info.
+    my $patch_info_grabber = new PatchReader::PatchInfoGrabber();
+    $last_reader->sends_data_to($patch_info_grabber);
+    $last_reader = $patch_info_grabber;
+
+    # Prints out to temporary file.
+    my ($fh, $filename) = File::Temp::tempfile();
+    my $raw_printer = new PatchReader::DiffPrinter::raw($fh);
+    $last_reader->sends_data_to($raw_printer);
+    $last_reader = $raw_printer;
+
+    # Iterate!
+    $reader->iterate_string($attachment->id, $attachment->data);
+
+    return ($filename, $patch_info_grabber->patch_info()->{files});
+}
+
+sub warn_if_interdiff_might_fail {
+    my ($old_file_list, $new_file_list) = @_;
+
+    # Verify that the list of files diffed is the same.
+    my @old_files = sort keys %{$old_file_list};
+    my @new_files = sort keys %{$new_file_list};
+    if (@old_files != @new_files
+        || join(' ', @old_files) ne join(' ', @new_files))
+    {
+        return 'interdiff1';
+    }
+
+    # Verify that the revisions in the files are the same.
+    foreach my $file (keys %{$old_file_list}) {
+        if ($old_file_list->{$file}{old_revision} ne
+            $new_file_list->{$file}{old_revision})
+        {
+            return 'interdiff2';
+        }
+    }
+    return undef;
+}
+
+sub setup_patch_readers {
+    my ($diff_root, $context) = @_;
+
+    # Parameters:
+    # format=raw|html
+    # context=patch|file|0-n
+    # collapsed=0|1
+    # headers=0|1
+
+    # Define the patch readers.
+    # The reader that reads the patch in (whatever its format).
+    require PatchReader::Raw;
+    my $reader = new PatchReader::Raw;
+    my $last_reader = $reader;
+    # Fix the patch root if we have a cvs root.
+    if (Bugzilla->params->{'cvsroot'}) {
+        require PatchReader::FixPatchRoot;
+        $last_reader->sends_data_to(new PatchReader::FixPatchRoot(Bugzilla->params->{'cvsroot'}));
+        $last_reader->sends_data_to->diff_root($diff_root) if defined($diff_root);
+        $last_reader = $last_reader->sends_data_to;
+    }
+
+    # Add in cvs context if we have the necessary info to do it
+    if ($context ne 'patch' && $cvsbin && Bugzilla->params->{'cvsroot_get'}) {
+        require PatchReader::AddCVSContext;
+        $last_reader->sends_data_to(
+          new PatchReader::AddCVSContext($context, Bugzilla->params->{'cvsroot_get'}));
+        $last_reader = $last_reader->sends_data_to;
+    }
+
+    return ($reader, $last_reader);
+}
+
+sub setup_template_patch_reader {
+    my ($last_reader, $format, $context, $vars) = @_;
+    my $cgi = Bugzilla->cgi;
+    my $template = Bugzilla->template;
+
+    require PatchReader::DiffPrinter::template;
+
+    # Define the vars for templates.
+    if (defined $cgi->param('headers')) {
+        $vars->{'headers'} = $cgi->param('headers');
+    }
+    else {
+        $vars->{'headers'} = 1 if !defined $cgi->param('headers');
+    }
+
+    $vars->{'collapsed'} = $cgi->param('collapsed');
+    $vars->{'context'} = $context;
+    $vars->{'do_context'} = $cvsbin && Bugzilla->params->{'cvsroot_get'} && !$vars->{'newid'};
+
+    # Print everything out.
+    print $cgi->header(-type => 'text/html',
+                       -expires => '+3M');
+
+    $last_reader->sends_data_to(new PatchReader::DiffPrinter::template($template,
+                                "attachment/diff-header.$format.tmpl",
+                                "attachment/diff-file.$format.tmpl",
+                                "attachment/diff-footer.$format.tmpl",
+                                { %{$vars},
+                                  bonsai_url => Bugzilla->params->{'bonsai_url'},
+                                  lxr_url => Bugzilla->params->{'lxr_url'},
+                                  lxr_root => Bugzilla->params->{'lxr_root'},
+                                }));
+}
+
+1;
+
+__END__