1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
| | # 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
# This adds CSS spans for diff highlighting.
# It also generates links for ViewVCS + SolverGit to show
# (or reconstruct) blobs.
package PublicInbox::ViewDiff;
use strict;
use warnings;
use base qw(Exporter);
our @EXPORT_OK = qw(flush_diff);
use URI::Escape qw(uri_escape_utf8);
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_CTX () { 3 } # /^ /
sub DSTATE_ADD () { 4 } # /^\+/
sub DSTATE_DEL () { 5 } # /^\-/
my @state2class = (
'', # init
'', # stat
'head',
'', # ctx
'add',
'del'
);
sub UNSAFE () { "^A-Za-z0-9\-\._~/" }
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 ($$) {
$_[0]->linkify_1($_[1]);
$_[0]->linkify_2(ascii_html($_[1]));
}
# link to line numbers in blobs
sub diff_hunk ($$$$) {
my ($dctx, $spfx, $ca, $cb) = @_;
my $oid_a = $dctx->{oid_a};
my $oid_b = $dctx->{oid_b};
(defined($spfx) && defined($oid_a) && defined($oid_b)) or
return "@@ $ca $cb @@";
my ($n) = ($ca =~ /^-(\d+)/);
$n = defined($n) ? do { ++$n; "#n$n" } : '';
my $rv = qq(@@ <a\nhref="$spfx$oid_a/s/$dctx->{Q}$n">$ca</a>);
($n) = ($cb =~ /^\+(\d+)/);
$n = defined($n) ? do { ++$n; "#n$n" } : '';
$rv .= qq( <a\nhref="$spfx$oid_b/s/$dctx->{Q}$n">$cb</a> @@);
}
sub oid ($$$) {
my ($dctx, $spfx, $oid) = @_;
defined($spfx) ? qq(<a\nhref="$spfx$oid/s/$dctx->{Q}">$oid</a>) : $oid;
}
sub to_state ($$$) {
my ($dst, $state, $new_state) = @_;
$$dst .= '</span>' if $state2class[$state];
$_[1] = $new_state;
my $class = $state2class[$new_state] or return;
$$dst .= qq(<span\nclass="$class">);
}
sub flush_diff ($$$$) {
my ($dst, $spfx, $linkify, $diff) = @_;
my $state = DSTATE_INIT;
my $dctx = { Q => '' }; # {}, keys: oid_a, oid_b, path_a, path_b
foreach my $s (@$diff) {
if ($s =~ /^ /) {
if ($state2class[$state]) {
to_state($dst, $state, DSTATE_CTX);
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^-- $/) { # email signature begins
$state == DSTATE_INIT or
to_state($dst, $state, DSTATE_INIT);
$$dst .= $s;
} elsif ($s =~ m!^diff --git ($PATH_A) ($PATH_B)$!) {
if ($state != DSTATE_HEAD) {
my ($pa, $pb) = ($1, $2);
to_state($dst, $state, DSTATE_HEAD);
$pa = (split('/', git_unquote($pa), 2))[1];
$pb = (split('/', git_unquote($pb), 2))[1];
$dctx = {
Q => "?b=".uri_escape_utf8($pb, UNSAFE),
};
if ($pa ne $pb) {
$dctx->{Q} .=
"&a=".uri_escape_utf8($pa, UNSAFE);
}
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ s/^(index $OID_NULL\.\.)($OID_BLOB)\b//o) {
$$dst .= $1 . oid($dctx, $spfx, $2);
$$dst .= to_html($linkify, $s) ;
} elsif ($s =~ s/^index ($OID_NULL)(\.\.$OID_BLOB)\b//o) {
$$dst .= 'index ' . oid($dctx, $spfx, $1) . $2;
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^index ($OID_BLOB)\.\.($OID_BLOB)/o) {
$dctx->{oid_a} = $1;
$dctx->{oid_b} = $2;
$$dst .= to_html($linkify, $s);
} elsif ($s =~ s/^@@ (\S+) (\S+) @@//) {
$$dst .= '</span>' if $state2class[$state];
$$dst .= qq(<span\nclass="hunk">);
$$dst .= diff_hunk($dctx, $spfx, $1, $2);
$$dst .= '</span>';
$state = DSTATE_CTX;
$$dst .= to_html($linkify, $s);
} elsif ($s =~ m!^--- $PATH_A! ||
$s =~ m!^\+{3} $PATH_B!) {
# color only (no oid link)
$state == DSTATE_INIT and
to_state($dst, $state, DSTATE_HEAD);
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^\+/) {
if ($state != DSTATE_ADD && $state != DSTATE_INIT) {
to_state($dst, $state, DSTATE_ADD);
}
$$dst .= to_html($linkify, $s);
} elsif ($s =~ /^-/) {
if ($state != DSTATE_DEL && $state != DSTATE_INIT) {
to_state($dst, $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 {
$state == DSTATE_INIT or
to_state($dst, $state, DSTATE_INIT);
$$dst .= to_html($linkify, $s);
}
}
@$diff = ();
$$dst .= '</span>' if $state2class[$state];
undef;
}
1;
|