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| | # Copyright (C) 2019 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
#
# used by PublicInbox::View
package PublicInbox::ViewDiff;
use strict;
use warnings;
use base qw(Exporter);
our @EXPORT_OK = qw(flush_diff);
use PublicInbox::Hval qw(ascii_html);
use PublicInbox::Git qw(git_unquote);
sub DSTATE_INIT () { 0 }
sub DSTATE_STAT () { 1 } # TODO
sub DSTATE_HEAD () { 2 } # /^diff --git /, /^index /, /^--- /, /^\+\+\+ /
sub DSTATE_HUNK () { 3 } # /^@@ /
sub DSTATE_CTX () { 4 } # /^ /
sub DSTATE_ADD () { 5 } # /^\+/
sub DSTATE_DEL () { 6 } # /^\-/
my $OID_NULL = '0{7,40}';
my $OID_BLOB = '[a-f0-9]{7,40}';
my $PATH_A = '"?a/.+|/dev/null';
my $PATH_B = '"?b/.+|/dev/null';
sub to_html ($$) {
$_[0]->linkify_1($_[1]);
$_[0]->linkify_2(ascii_html($_[1]));
}
# link to line numbers in blobs
sub diff_hunk ($$$$) {
my ($dctx, $spfx, $ca, $cb) = @_;
my $oid_a = $dctx->{oid_a};
my $oid_b = $dctx->{oid_b};
(defined($oid_a) && defined($oid_b)) or return "@@ $ca $cb @@";
my ($n) = ($ca =~ /^-(\d+)/);
$n = defined($n) ? do { ++$n; "#n$n" } : '';
my $rv = qq(@@ <a\nhref=$spfx$oid_a/s$n>$ca</a>);
($n) = ($cb =~ /^\+(\d+)/);
$n = defined($n) ? do { ++$n; "#n$n" } : '';
$rv .= qq( <a\nhref=$spfx$oid_b/s$n>$cb</a> @@);
}
sub flush_diff ($$$$) {
my ($dst, $spfx, $linkify, $diff) = @_;
my $state = DSTATE_INIT;
my $dctx; # {}, keys: oid_a, oid_b, path_a, path_b
foreach my $s (@$diff) {
if ($s =~ /^ /) {
if ($state == DSTATE_HUNK || $state == DSTATE_ADD ||
$state == DSTATE_DEL || $state == DSTATE_HEAD) {
$$dst .= "</span><span\nclass=ctx>";
$state = DSTATE_CTX;
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^-- $/) { # email signature begins
if ($state != DSTATE_INIT) {
$state = DSTATE_INIT;
$$dst .= '</span>';
}
$$dst .= $s;
} elsif ($s =~ m!^diff --git ($PATH_A) ($PATH_B)$!x) {
if ($state != DSTATE_HEAD) {
my ($pa, $pb) = ($1, $2);
$$dst .= '</span>' if $state != DSTATE_INIT;
$$dst .= "<span\nclass=head>";
$state = DSTATE_HEAD;
$pa = (split('/', git_unquote($pa), 2))[1];
$pb = (split('/', git_unquote($pb), 2))[1];
$dctx = { path_a => $pa, path_b => $pb };
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ s/^(index $OID_NULL\.\.)($OID_BLOB)\b//o) {
$$dst .= qq($1<a\nhref=$spfx$2/s>$2</a>);
$$dst .= to_html($linkify, $s) ;
} elsif ($s =~ s/^index ($OID_NULL)(\.\.$OID_BLOB)\b//o) {
$$dst .= 'index ';
$$dst .= qq(<a\nhref=$spfx$1/s>$1</a>$2);
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^index ($OID_BLOB)\.\.($OID_BLOB)/o) {
$dctx->{oid_a} = $1;
$dctx->{oid_b} = $2;
$$dst .= to_html($linkify, $s);
} elsif ($s =~ s/^@@ (\S+) (\S+) @@//) {
my ($ca, $cb) = ($1, $2);
if ($state == DSTATE_HEAD || $state == DSTATE_CTX ||
$state == DSTATE_ADD || $state == DSTATE_DEL) {
$$dst .= "</span><span\nclass=hunk>";
$state = DSTATE_HUNK;
$$dst .= diff_hunk($dctx, $spfx, $ca, $cb);
} else {
$$dst .= to_html($linkify, "@@ $ca $cb @@");
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ m!^--- $PATH_A!) {
if ($state == DSTATE_INIT) { # color only (no oid link)
$state = DSTATE_HEAD;
$$dst .= "<span\nclass=head>";
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ m!^\+{3} $PATH_B!) {
if ($state == DSTATE_INIT) { # color only (no oid link)
$state = DSTATE_HEAD;
$$dst .= "<span\nclass=head>";
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^\+/) {
if ($state != DSTATE_ADD && $state != DSTATE_INIT) {
$$dst .= "</span><span\nclass=add>";
$state = DSTATE_ADD;
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^-/) {
if ($state != DSTATE_DEL && $state != DSTATE_INIT) {
$$dst .= "</span><span\nclass=del>";
$state = DSTATE_DEL;
}
$$dst .= to_html($linkify, $s);
# ignore the following lines in headers:
} elsif ($s =~ /^(?:dis)similarity index/ ||
$s =~ /^(?:old|new) mode/ ||
$s =~ /^(?:deleted|new) file mode/ ||
$s =~ /^(?:copy|rename) (?:from|to) / ||
$s =~ /^(?:dis)?similarity index /) {
$$dst .= to_html($linkify, $s);
} else {
if ($state != DSTATE_INIT) {
$$dst .= '</span>';
$state = DSTATE_INIT;
}
$$dst .= to_html($linkify, $s);
}
}
@$diff = ();
$$dst .= '</span>' if $state != DSTATE_INIT;
undef;
}
1;
|