repobrowse: shorten internal names

We'll still be keeping "repobrowse" for the public API
for use with .psgi files, but shortening the name means
less typing and we may have command-line tools, too.

1 files changed, 201 insertions, 0 deletions

diff --git a/lib/PublicInbox/RepoGitCommit.pm b/lib/PublicInbox/RepoGitCommit.pm
new file mode 100644
index 00000000..e98c3c18
--- /dev/null
+++ b/lib/PublicInbox/RepoGitCommit.pm
@@ -0,0 +1,201 @@
+# Copyright (C) 2015 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# shows the /commit/ endpoint for git repositories
+#
+# anchors used:
+#        D - diffstat
+#        P - parents
+#        ...and various filenames from to_attr
+# The 'D' and 'P' anchors may conflict with odd filenames, but we won't
+# punish the common case with extra bytes if somebody uses 'D' or 'P'
+# in filenames.
+
+package PublicInbox::RepoGitCommit;
+use strict;
+use warnings;
+use base qw(PublicInbox::RepoBase);
+use PublicInbox::Hval qw(utf8_html to_attr);
+use PublicInbox::RepoGit qw(git_unquote git_commit_title);
+use PublicInbox::RepoGitDiffCommon;
+use PublicInbox::Qspawn;
+
+use constant GIT_FMT => '--pretty=format:'.join('%n',
+        '%H', '%h', '%s', '%an <%ae>', '%ai', '%cn <%ce>', '%ci',
+        '%t', '%p', '%D', '%b%x00');
+
+use constant CC_EMPTY => " This is a merge, and the combined diff is empty.\n";
+use constant CC_MERGE => " This is a merge, showing combined diff:\n\n";
+
+sub commit_header {
+        my ($self, $req) = @_;
+        my ($H, $h, $s, $au, $ad, $cu, $cd, $t, $p, $D, $rest) =
+                split("\n", $req->{dbuf}, 11);
+        $s = utf8_html($s);
+        $au = utf8_html($au);
+        $cu = utf8_html($cu);
+        my @p = split(' ', $p);
+
+        my $rel = $req->{relcmd};
+        my $q = $req->{'q'};
+        my $qs = $req->{qs} = $q->qs(id => $h);
+        my $x = $self->html_start($req, $s) . "\n" .
+                qq(   commit $H (<a\nhref="${rel}patch$qs">patch</a>)\n) .
+                qq(     tree <a\nrel=nofollow\nhref="${rel}tree?id=$h">$t</a>);
+
+        my $git = $req->{repo_info}->{git};
+        # extra show path information, if any
+        my $extra = $req->{extra};
+        my $path = '';
+        if (@$extra) {
+                my @t;
+                my $ep;
+                $x .= ' -- ';
+                $x .= join('/', map {
+                        push @t, $_;
+                        my $e = PublicInbox::Hval->utf8($_, join('/', @t));
+                        $ep = $e->as_path;
+                        my $eh = $e->as_html;
+                        $ep = "${rel}tree/$ep?id=$h";
+                        qq(<a\nrel=nofollow\nhref="$ep">$eh</a>);
+                } @$extra);
+                $path = "/$ep";
+        }
+
+        $x .= "\n   author $au\t$ad\ncommitter $cu\t$cd\n";
+        my $np = scalar @p;
+        if ($np == 1) {
+                my $p = $p[0];
+                $x .= git_parent_line('   parent', $p, $q, $git, $rel, $path);
+        } elsif ($np > 1) {
+                $req->{mhelp} = CC_MERGE;
+                my @common = ($q, $git, $rel, $path);
+                my @t = @p;
+                my $p = shift @t;
+                $x .= git_parent_line('  parents', $p, @common);
+                foreach $p (@t) {
+                        $x .= git_parent_line('         ', $p, @common);
+                }
+        }
+        $x .= "\n<b>";
+        $x .= $s;
+        $x .= "</b>\n\n";
+        my $bx00;
+
+        # FIXME: deal with excessively long commit message bodies
+        ($bx00, $req->{dbuf}) = split("\0", $rest, 2);
+        $req->{anchors} = {};
+        $req->{h} = $h;
+        $req->{p} = \@p;
+        $x .= utf8_html($bx00) . "<a\nid=D>---</a>\n";
+}
+
+sub git_commit_sed ($$) {
+        my ($self, $req) = @_;
+        git_diff_sed_init($req);
+        my $dbuf = \($req->{dbuf});
+
+        # this filters for $fh->write or $body->getline (see Qspawn)
+        sub {
+                my $dst = '';
+                if (defined $_[0]) { # $_[0] == scalar buffer
+                        $$dbuf .= $_[0];
+                        if ($req->{dstate} == DSTATE_INIT) {
+                                return $dst if index($$dbuf, "\0") < 0;
+                                $req->{dstate} = DSTATE_STAT;
+                                $dst .= commit_header($self, $req);
+                        }
+                        git_diff_sed_run(\$dst, $req);
+                } else { # undef means EOF from "git show", flush the last bit
+                        git_diff_sed_close(\$dst, $req);
+                        $dst .= CC_EMPTY if delete $req->{mhelp};
+                        show_unchanged(\$dst, $req);
+                        $dst .= '</pre></body></html>';
+                }
+                $dst;
+        }
+}
+
+sub call_git_commit { # RepoBase calls this
+        my ($self, $req) = @_;
+        my $env = $req->{env};
+        my $q = PublicInbox::RepoGitQuery->new($env);
+        my $id = $q->{id};
+        $id eq '' and $id = 'HEAD';
+
+        my $expath = $req->{expath};
+        if ($expath ne '') {
+                my $relup = join('', map { '../' } @{$req->{extra}});
+                my $qs = $q->qs;
+                return $self->r(301, $req, "$relup$qs#".to_attr($expath));
+        }
+
+        my $git = $req->{repo_info}->{git};
+        my $cmd = $git->cmd(qw(show -z --numstat -p --encoding=UTF-8
+                        --no-notes --no-color -c),
+                        $git->abbrev, GIT_FMT, $id, '--');
+        my $rdr = { 2 => $git->err_begin };
+        my $qsp = PublicInbox::Qspawn->new($cmd, undef, $rdr);
+        $req->{'q'} = $q;
+        $env->{'qspawn.quiet'} = 1;
+        $qsp->psgi_return($env, undef, sub { # parse header
+                my ($r, $bref) = @_;
+                if (!defined $r) {
+                        my $errmsg = $git->err;
+                        [ 500, [ 'Content-Type', 'text/html' ], [ $errmsg ] ];
+                } elsif ($r == 0) {
+                        git_commit_404($req);
+                } else {
+                        $env->{'qspawn.filter'} = git_commit_sed($self, $req);
+                        [ 200, [ 'Content-Type', 'text/html' ] ];
+                }
+        });
+}
+
+sub git_commit_404 {
+        my ($req) = @_;
+        my $x = 'Missing commit or path';
+        my $pfx = "$req->{relcmd}commit";
+
+        my $try = 'try';
+        $x = "<html><head><title>$x</title></head><body><pre><b>$x</b>\n\n";
+        my $qs = $req->{'q'}->qs(id => '');
+        $x .= "<a\nhref=\"$pfx$qs\">$try the latest commit in HEAD</a>\n";
+        $x .= '</pre></body>';
+
+        [404, ['Content-Type'=>'text/html'], [ $x ]];
+}
+
+# FIXME: horrifically expensive...
+sub git_parent_line {
+        my ($pfx, $p, $q, $git, $rel, $path) = @_;
+        my $qs = $q->qs(id => $p);
+        my $t = git_commit_title($git, $p);
+        $t = defined $t ? utf8_html($t) : '';
+        $pfx . qq( <a\nid=P\nhref="${rel}commit$path$qs">$p</a> $t\n);
+}
+
+# do not break anchor links if the combined diff doesn't show changes:
+sub show_unchanged {
+        my ($dst, $req) = @_;
+
+        my @unchanged = sort keys %{$req->{anchors}};
+        return unless @unchanged;
+        my $anchors = $req->{anchors};
+        $$dst .= "\n There are uninteresting changes from this merge.\n" .
+                qq( See the <a\nhref="#P">parents</a>, ) .
+                "or view final state(s) below:\n\n";
+        my $rel = $req->{relcmd};
+        my $qs = $req->{qs};
+        foreach my $anchor (@unchanged) {
+                my $fn = $anchors->{$anchor};
+                my $p = PublicInbox::Hval->utf8(git_unquote($fn));
+                $p = $p->as_path;
+                $fn = utf8_html($fn);
+                $$dst .= qq(\t<a\nrel=nofollow);
+                $$dst .= qq(\nid="$anchor"\nhref="${rel}tree/$p$qs">);
+                $$dst .= "$fn</a>\n";
+        }
+}
+
+1;