From ca0a28d52d43609cd6cabf5af085260032e5afa9 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Thu, 17 Jan 2019 11:51:34 +0000
Subject: view: wire up diff and vcs viewers with solver

---
 lib/PublicInbox/ViewDiff.pm | 147 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 lib/PublicInbox/ViewDiff.pm

(limited to 'lib/PublicInbox/ViewDiff.pm')

diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
new file mode 100644
index 00000000..ee450fa7
--- /dev/null
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -0,0 +1,147 @@
+# 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;
-- 
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