/usr/bin/ikiwiki-comment is in ikiwiki 3.20160121.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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  | #!/usr/bin/perl
use warnings;
use strict;
use IkiWiki;
use IkiWiki::Plugin::comments;
use Getopt::Long;
sub usage {
	die gettext("usage: ikiwiki-comment pagefile [options]") . "\n";
}
sub main {
	my $pagefile=shift || usage();
	my $interactive = -t STDIN;
	my $content;
	my ($format, $username, $subject, $date, $url, $email, $ip);
	GetOptions(
		'format:s'	=> \$format,
		'username:s'	=> \$username,
		'subject:s'	=> \$subject,
		'date:s'	=> \$date,
		'url:s'		=> \$url,
		'email:s'	=> \$email,
		'ip:s'		=> \$ip,
	) || usage();
	my $dir=get_dir($pagefile);
	my $page=get_page($pagefile);
	IkiWiki::Plugin::comments::checkconfig();
	if ($interactive) {
		$format		||= 'mdwn';
		$username	||= get_username();
		$subject	||= get_subject($page, $dir);
		$date		||= IkiWiki::Plugin::comments::commentdate();
		$url		||= undef;
		$email		||= undef;
		$ip		||= undef;
	} else {
		$format		||= undef;
		die "must supply username" unless defined $username;
		$subject	||= get_subject($page, $dir);
		die "must supply date" unless defined $date;
		$url		||= undef;
		$email		||= undef;
		$ip		||= undef;
		chomp($content = join('', <STDIN>));
	}
	my $comment=get_comment($format, $username, $subject, $date, $url, $email, $ip, $content);
	# For interactive use, this will yield a hash of the comment before
	# it's edited, but that's ok; the date provides sufficient entropy
	# to avoid collisions, and the hash of a comment does not need to
	# match its actual content.
	# Doing it this way avoids needing to move the file to a final
	# location after it's edited.
	my $location=IkiWiki::Plugin::comments::unique_comment_location($page, $comment, $dir)."._comment";
	IkiWiki::writefile($location, $dir, $comment);
	exec_editor("$dir/$location") if $interactive;
}
sub get_dir {
	my ($file) = @_;
	my $dir=IkiWiki::dirname($file);
	$dir="." unless length $dir;
	return $dir;
}
sub get_page {
	my ($file) = @_;
	my $page=IkiWiki::basename($file);
	$page=~s/\.[^.]+$// unless -d $file;
	return $page;
}
sub get_username {
	my $username = getpwuid($<);
	$username="" unless defined $username;
	return $username;
}
sub get_subject {
	my ($page, $dir) = @_;
	my $comment_num=1+IkiWiki::Plugin::comments::num_comments($page, $dir);
	return "comment $comment_num";
}
sub get_comment {
	my ($format, $username, $subject, $date, $url, $email, $ip, $content) = @_;
	$format = defined $format ? $format = " format=$format" : q{};
	$content = '' unless defined $content;
	my $comment="[[!comment$format\n";
	$comment.=" username=\"$username\"\n";
	$comment.=" subject=\"\"\"$subject\"\"\"\n";
	$comment.=" date=\"$date\"\n";
	$comment.=" url=\"$url\"\n" if defined $url;
	$comment.=" email=\"$email\"\n" if defined $email;
	$comment.=" ip=\"$ip\"\n" if defined $ip;
	$comment.=" content=\"\"\"\n$content\n\"\"\"]]\n";
	return $comment;
}
sub exec_editor {
	my ($file) = @_;
	my @editor="vi";
	if (-x "/usr/bin/editor") {
		@editor="/usr/bin/editor";
	}
	if (exists $ENV{EDITOR}) {
		@editor=split(' ', $ENV{EDITOR});
	}
	if (exists $ENV{VISUAL}) {
	@editor=split(' ', $ENV{VISUAL});
	}
	exec(@editor, $file);
}
main(@ARGV);
 |