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gitweb: Buffer diff header to deal with split patches + git_patchset_…
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…body refactoring

There are some cases when one line from "raw" git-diff output (raw format)
corresponds to more than one patch in the patchset git-diff output. To deal
with this buffer git diff header and extended diff header (everything up to
actual patch) to check from information from "index <hash>..<hash>" extended
header line if the patch corresponds to the same or next difftree raw line.

This could also be used to gather information needed for hyperlinking, and
used for printing gitweb quoted filenames, from extended diff header instead
of raw git-diff output.

While at it, refactor git_patchset_body subroutine from the event-driven,
AWK-like state-machine parsing to sequential parsing: for each patch
parse (and output) git diff header, parse extended diff header, parse two-line
from-file/to-file diff header, parse patch itself; patch ends with the end
of input [file] or the line matching m/^diff /.

For better understanding the code, there were added assertions in the
comments a la Carp::Assert module. Just in case there is commented out code
dealing with unexpected end of input (should not happen, hence commented
out).

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
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Jakub Narebski authored and Junio C Hamano committed Nov 21, 2006
1 parent 04408c3 commit 6d55f05
Showing 1 changed file with 136 additions and 99 deletions.
235 changes: 136 additions & 99 deletions gitweb/gitweb.perl
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Original file line number Diff line number Diff line change
Expand Up @@ -2202,31 +2202,56 @@ sub git_patchset_body {
my ($fd, $difftree, $hash, $hash_parent) = @_;

my $patch_idx = 0;
my $in_header = 0;
my $patch_found = 0;
my $patch_line;
my $diffinfo;
my (%from, %to);
my ($from_id, $to_id);

print "<div class=\"patchset\">\n";

LINE:
while (my $patch_line = <$fd>) {
# skip to first patch
while ($patch_line = <$fd>) {
chomp $patch_line;

if ($patch_line =~ m/^diff /) { # "git diff" header
# beginning of patch (in patchset)
if ($patch_found) {
# close extended header for previous empty patch
if ($in_header) {
print "</div>\n" # class="diff extended_header"
}
# close previous patch
print "</div>\n"; # class="patch"
} else {
# first patch in patchset
$patch_found = 1;
last if ($patch_line =~ m/^diff /);
}

PATCH:
while ($patch_line) {
my @diff_header;

# git diff header
#assert($patch_line =~ m/^diff /) if DEBUG;
#assert($patch_line !~ m!$/$!) if DEBUG; # is chomp-ed
push @diff_header, $patch_line;

# extended diff header
EXTENDED_HEADER:
while ($patch_line = <$fd>) {
chomp $patch_line;

last EXTENDED_HEADER if ($patch_line =~ m/^--- /);

if ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/) {
$from_id = $1;
$to_id = $2;
}
print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n";

push @diff_header, $patch_line;
}
#last PATCH unless $patch_line;
my $last_patch_line = $patch_line;

# check if current patch belong to current raw line
# and parse raw git-diff line if needed
if (defined $diffinfo &&
$diffinfo->{'from_id'} eq $from_id &&
$diffinfo->{'to_id'} eq $to_id) {
# this is split patch
print "<div class=\"patch cont\">\n";
} else {
# advance raw git-diff output if needed
$patch_idx++ if defined $diffinfo;

# read and prepare patch information
if (ref($difftree->[$patch_idx]) eq "HASH") {
Expand All @@ -2247,100 +2272,112 @@ sub git_patchset_body {
hash=>$diffinfo->{'to_id'},
file_name=>$to{'file'});
}
$patch_idx++;

# print "git diff" header
$patch_line =~ s!^(diff (.*?) )"?a/.*$!$1!;
if ($from{'href'}) {
$patch_line .= $cgi->a({-href => $from{'href'}, -class => "path"},
'a/' . esc_path($from{'file'}));
} else { # file was added
$patch_line .= 'a/' . esc_path($from{'file'});
}
$patch_line .= ' ';
if ($to{'href'}) {
$patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
'b/' . esc_path($to{'file'}));
} else { # file was deleted
$patch_line .= 'b/' . esc_path($to{'file'});
}

print "<div class=\"diff header\">$patch_line</div>\n";
print "<div class=\"diff extended_header\">\n";
$in_header = 1;
next LINE;
# this is first patch for raw difftree line with $patch_idx index
# we index @$difftree array from 0, but number patches from 1
print "<div class=\"patch\" id=\"patch". ($patch_idx+1) ."\">\n";
}

if ($in_header) {
if ($patch_line !~ m/^---/) {
# match <path>
if ($patch_line =~ s!^((copy|rename) from ).*$!$1! && $from{'href'}) {
$patch_line .= $cgi->a({-href=>$from{'href'}, -class=>"path"},
esc_path($from{'file'}));
}
if ($patch_line =~ s!^((copy|rename) to ).*$!$1! && $to{'href'}) {
$patch_line = $cgi->a({-href=>$to{'href'}, -class=>"path"},
esc_path($to{'file'}));
}
# match <mode>
if ($patch_line =~ m/\s(\d{6})$/) {
$patch_line .= '<span class="info"> (' .
file_type_long($1) .
')</span>';
# print "git diff" header
$patch_line = shift @diff_header;
$patch_line =~ s!^(diff (.*?) )"?a/.*$!$1!;
if ($from{'href'}) {
$patch_line .= $cgi->a({-href => $from{'href'}, -class => "path"},
'a/' . esc_path($from{'file'}));
} else { # file was added
$patch_line .= 'a/' . esc_path($from{'file'});
}
$patch_line .= ' ';
if ($to{'href'}) {
$patch_line .= $cgi->a({-href => $to{'href'}, -class => "path"},
'b/' . esc_path($to{'file'}));
} else { # file was deleted
$patch_line .= 'b/' . esc_path($to{'file'});
}
print "<div class=\"diff header\">$patch_line</div>\n";

# print extended diff header
print "<div class=\"diff extended_header\">\n" if (@diff_header > 0);
EXTENDED_HEADER:
foreach $patch_line (@diff_header) {
# match <path>
if ($patch_line =~ s!^((copy|rename) from ).*$!$1! && $from{'href'}) {
$patch_line .= $cgi->a({-href=>$from{'href'}, -class=>"path"},
esc_path($from{'file'}));
}
if ($patch_line =~ s!^((copy|rename) to ).*$!$1! && $to{'href'}) {
$patch_line = $cgi->a({-href=>$to{'href'}, -class=>"path"},
esc_path($to{'file'}));
}
# match <mode>
if ($patch_line =~ m/\s(\d{6})$/) {
$patch_line .= '<span class="info"> (' .
file_type_long($1) .
')</span>';
}
# match <hash>
if ($patch_line =~ m/^index/) {
my ($from_link, $to_link);
if ($from{'href'}) {
$from_link = $cgi->a({-href=>$from{'href'}, -class=>"hash"},
substr($diffinfo->{'from_id'},0,7));
} else {
$from_link = '0' x 7;
}
# match <hash>
if ($patch_line =~ m/^index/) {
my ($from_link, $to_link);
if ($from{'href'}) {
$from_link = $cgi->a({-href=>$from{'href'}, -class=>"hash"},
substr($diffinfo->{'from_id'},0,7));
} else {
$from_link = '0' x 7;
}
if ($to{'href'}) {
$to_link = $cgi->a({-href=>$to{'href'}, -class=>"hash"},
substr($diffinfo->{'to_id'},0,7));
} else {
$to_link = '0' x 7;
}
my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
$patch_line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
if ($to{'href'}) {
$to_link = $cgi->a({-href=>$to{'href'}, -class=>"hash"},
substr($diffinfo->{'to_id'},0,7));
} else {
$to_link = '0' x 7;
}
print $patch_line . "<br/>\n";

} else {
#$in_header && $patch_line =~ m/^---/;
print "</div>\n"; # class="diff extended_header"
$in_header = 0;
#affirm {
# my ($from_hash, $to_hash) =
# ($patch_line =~ m/^index ([0-9a-fA-F]{40})..([0-9a-fA-F]{40})/);
# my ($from_id, $to_id) =
# ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
# ($from_hash eq $from_id) && ($to_hash eq $to_id);
#} if DEBUG;
my ($from_id, $to_id) = ($diffinfo->{'from_id'}, $diffinfo->{'to_id'});
$patch_line =~ s!$from_id\.\.$to_id!$from_link..$to_link!;
}
print $patch_line . "<br/>\n";
}
print "</div>\n" if (@diff_header > 0); # class="diff extended_header"

# from-file/to-file diff header
$patch_line = $last_patch_line;
#assert($patch_line =~ m/^---/) if DEBUG;
if ($from{'href'}) {
$patch_line = '--- a/' .
$cgi->a({-href=>$from{'href'}, -class=>"path"},
esc_path($from{'file'}));
}
print "<div class=\"diff from_file\">$patch_line</div>\n";

if ($from{'href'}) {
$patch_line = '--- a/' .
$cgi->a({-href=>$from{'href'}, -class=>"path"},
esc_path($from{'file'}));
}
print "<div class=\"diff from_file\">$patch_line</div>\n";
$patch_line = <$fd>;
#last PATCH unless $patch_line;
chomp $patch_line;

$patch_line = <$fd>;
chomp $patch_line;
#assert($patch_line =~ m/^+++/) if DEBUG;
if ($to{'href'}) {
$patch_line = '+++ b/' .
$cgi->a({-href=>$to{'href'}, -class=>"path"},
esc_path($to{'file'}));
}
print "<div class=\"diff to_file\">$patch_line</div>\n";

#$patch_line =~ m/^+++/;
if ($to{'href'}) {
$patch_line = '+++ b/' .
$cgi->a({-href=>$to{'href'}, -class=>"path"},
esc_path($to{'file'}));
}
print "<div class=\"diff to_file\">$patch_line</div>\n";
# the patch itself
LINE:
while ($patch_line = <$fd>) {
chomp $patch_line;

}
next PATCH if ($patch_line =~ m/^diff /);

next LINE;
print format_diff_line($patch_line);
}

print format_diff_line($patch_line);
} continue {
print "</div>\n"; # class="patch"
}
print "</div>\n" if $in_header; # extended header

print "</div>\n" if $patch_found; # class="patch"

print "</div>\n"; # class="patchset"
}
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