[rt-commit] [svn] r609 - in RT-Client: . bin

jesse at fsck.com jesse at fsck.com
Fri Mar 19 17:15:15 EST 2004


Author: jesse
Date: Fri Mar 19 17:15:15 2004
New Revision: 609

Added:
   RT-Client/MANIFEST
   RT-Client/META.yml
   RT-Client/Makefile.PL
   RT-Client/bin/
   RT-Client/bin/rt
Modified:
   RT-Client/   (props changed)
Log:
Initial commit of the client as a seperate package

Added: RT-Client/MANIFEST
==============================================================================
--- (empty file)
+++ RT-Client/MANIFEST	Fri Mar 19 17:15:15 2004
@@ -0,0 +1,17 @@
+bin/rt
+inc/ExtUtils/AutoInstall.pm
+inc/Module/Install.pm
+inc/Module/Install/AutoInstall.pm
+inc/Module/Install/Base.pm
+inc/Module/Install/Can.pm
+inc/Module/Install/Fetch.pm
+inc/Module/Install/Include.pm
+inc/Module/Install/Makefile.pm
+inc/Module/Install/Metadata.pm
+inc/Module/Install/Scripts.pm
+inc/Module/Install/Win32.pm
+inc/Module/Install/WriteAll.pm
+Makefile.PL
+MANIFEST
+META.yml
+SIGNATURE

Added: RT-Client/META.yml
==============================================================================
--- (empty file)
+++ RT-Client/META.yml	Fri Mar 19 17:15:15 2004
@@ -0,0 +1,13 @@
+name: RT-Client-Commandline
+version: 0.01
+abstract: A command line interface for RT from Best Practical Solutions
+author: Jesse Vincent <jesse at bestpractical.com>
+license: perl
+distribution_type: module
+requires:
+  Text::ParseWords: 0
+  HTTP::Request::Common: 0
+no_index:
+  directory:
+    - inc
+generated_by: Module::Install version 0.33

Added: RT-Client/Makefile.PL
==============================================================================
--- (empty file)
+++ RT-Client/Makefile.PL	Fri Mar 19 17:15:15 2004
@@ -0,0 +1,19 @@
+#!/usr/bin/perl
+
+use inc::Module::Install;
+
+name		('RT-Client-Commandline');
+author		('Jesse Vincent <jesse at bestpractical.com>');
+abstract	('A command line interface for RT from Best Practical Solutions');
+license		('perl');
+version		('0.01');
+install_script	('bin/rt');
+
+requires(
+	Text::ParseWords => '0',
+	HTTP::Request::Common => '0',
+);
+include('ExtUtils::AutoInstall');
+auto_install();
+
+WriteAll( sign => 1 );

Added: RT-Client/bin/rt
==============================================================================
--- (empty file)
+++ RT-Client/bin/rt	Fri Mar 19 17:15:15 2004
@@ -0,0 +1,1843 @@
+#!/usr/bin/perl -w
+# BEGIN LICENSE BLOCK
+# 
+# Copyright (c) 1996-2003 Jesse Vincent <jesse at bestpractical.com>
+# 
+# (Except where explictly superceded by other copyright notices)
+# 
+# This work is made available to you under the terms of Version 2 of
+# the GNU General Public License. A copy of that license should have
+# been provided with this software, but in any event can be snarfed
+# from www.gnu.org.
+# 
+# This work is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+# 
+# Unless otherwise specified, all modifications, corrections or
+# extensions to this work which alter its source code become the
+# property of Best Practical Solutions, LLC when submitted for
+# inclusion in the work.
+# 
+# 
+# END LICENSE BLOCK
+
+use strict;
+
+# This program is intentionally written to have as few non-core module
+# dependencies as possible. It should stay that way.
+
+use Cwd;
+use LWP;
+use Text::ParseWords;
+use HTTP::Request::Common;
+
+# We derive configuration information from hardwired defaults, dotfiles,
+# and the RT* environment variables (in increasing order of precedence).
+# Session information is stored in ~/.rt_sessions.
+
+my $VERSION = 0.02;
+my $HOME = eval{(getpwuid($<))[7]}
+           || $ENV{HOME} || $ENV{LOGDIR} || $ENV{HOMEPATH}
+           || ".";
+my %config = (
+    (
+        debug   => 0,
+        user    => eval{(getpwuid($<))[0]} || $ENV{USER} || $ENV{USERNAME},
+        passwd  => undef,
+        server  => 'http://localhost/rt/',
+    ),
+    config_from_file($ENV{RTCONFIG} || ".rtrc"),
+    config_from_env()
+);
+my $session = new Session("$HOME/.rt_sessions");
+my $REST = "$config{server}/REST/1.0";
+
+sub whine;
+sub DEBUG { warn @_ if $config{debug} >= shift }
+
+# These regexes are used by command handlers to parse arguments.
+# (XXX: Ask Autrijus how i18n changes these definitions.)
+
+my $name   = '[\w.-]+';
+my $field  = '[a-zA-Z][a-zA-Z0-9_-]*';
+my $label  = '[a-zA-Z0-9 at _.+-]+';
+my $labels = "(?:$label,)*$label";
+my $idlist = '(?:(?:\d+-)?\d+,)*(?:\d+-)?\d+';
+
+# Our command line looks like this:
+#
+#     rt <action> [options] [arguments]
+#
+# We'll parse just enough of it to decide upon an action to perform, and
+# leave the rest to per-action handlers to interpret appropriately.
+
+my %handlers = (
+#   handler     => [ ...aliases... ],
+    version     => ["version", "ver"],
+    shell       => ["shell"],
+    logout      => ["logout"],
+    help        => ["help", "man"],
+    show        => ["show", "cat"],
+    edit        => ["create", "edit", "new", "ed"],
+    list        => ["search", "list", "ls"],
+    comment     => ["comment", "correspond"],
+    link        => ["link", "ln"],
+    merge       => ["merge"],
+    grant       => ["grant", "revoke"],
+);
+
+my %actions;
+foreach my $fn (keys %handlers) {
+    foreach my $alias (@{ $handlers{$fn} }) {
+        $actions{$alias} = \&{"$fn"};
+    }
+}
+
+# Once we find and call an appropriate handler, we're done.
+
+sub handler {
+    my $action;
+
+    if (@ARGV && exists $actions{$ARGV[0]}) {
+        $action = shift @ARGV;
+    }
+    $actions{$action || "help"}->($action || ());
+}
+
+handler();
+exit;
+
+# Handler functions.
+# ------------------
+#
+# The following subs are handlers for each entry in %actions.
+
+sub shell {
+    $|=1;
+    print "rt> ";
+    while (<>) {
+        chomp;
+        next if /^#/ || /^\s*$/;
+
+        @ARGV = shellwords($_);
+        handler();
+        print "rt> ";
+    }
+    print "\n";
+}
+
+sub version {
+    print "rt $VERSION\n";
+}
+
+sub logout {
+    submit("$REST/logout") if defined $session->cookie;
+}
+
+my %help;
+sub help {
+    my ($action, $type) = @_;
+    my $key;
+
+    # What help topics do we know about?
+    if (!%help) {
+        local $/ = undef;
+        foreach my $item (@{ Form::parse(<DATA>) }) {
+            my $title = $item->[2]{Title};
+            my @titles = ref $title eq 'ARRAY' ? @$title : $title;
+
+            foreach $title (@titles) {
+                $help{$title} = $item->[2]{Text};
+            }
+        }
+    }
+
+    # What does the user want help with?
+    undef $action if ($action && $actions{$action} eq \&help);
+    unless ($action || $type) {
+        # If we don't know, we'll look for clues in @ARGV.
+        foreach (@ARGV) {
+            if (exists $help{$_}) { $key = $_; last; }
+        }
+        unless ($key) {
+            # Tolerate possibly plural words.
+            foreach (@ARGV) {
+                if ($_ =~ s/s$// && exists $help{$_}) { $key = $_; last; }
+            }
+        }
+    }
+
+    if ($type && $action) {
+        $key = "$type.$action";
+    }
+    $key ||= $type || $action || "introduction";
+
+    # Find a suitable topic to display.
+    while (!exists $help{$key}) {
+        if ($type && $action) {
+            if ($key eq "$type.$action") { $key = $action;        }
+            elsif ($key eq $action)      { $key = $type;          }
+            else                         { $key = "introduction"; }
+        }
+        else {
+            $key = "introduction";
+        }
+    }
+
+    print STDERR $help{$key}, "\n\n";
+}
+
+# Displays a list of objects that match some specified condition.
+
+sub list {
+    my ($q, $type, %data);
+    my $bad = 0;
+
+    while (@ARGV) {
+        $_ = shift @ARGV;
+
+        if (/^-t$/) {
+            $bad = 1, last unless defined($type = get_type_argument());
+        }
+        elsif (/^-S$/) {
+            $bad = 1, last unless get_var_argument(\%data);
+        }
+        elsif (/^-o$/) {
+            $data{orderby} = shift @ARGV;
+        }
+        elsif (/^-([isl])$/) {
+            $data{format} = $1;
+        }
+        elsif (/^-f$/) {
+            if ($ARGV[0] !~ /^(?:(?:$field,)*$field)$/) {
+                whine "No valid field list in '-f $ARGV[0]'.";
+                $bad = 1; last;
+            }
+            $data{fields} = shift @ARGV;
+        }
+        elsif (!defined $q && !/^-/) {
+            $q = $_;
+        }
+        else {
+            my $datum = /^-/ ? "option" : "argument";
+            whine "Unrecognised $datum '$_'.";
+            $bad = 1; last;
+        }
+    }
+
+    $type ||= "ticket";
+    unless ($type && defined $q) {
+        my $item = $type ? "query string" : "object type";
+        whine "No $item specified.";
+        $bad = 1;
+    }
+    return help("list", $type) if $bad;
+
+    my $r = submit("$REST/search/$type", { query => $q, %data });
+    print $r->content;
+}
+
+# Displays selected information about a single object.
+
+sub show {
+    my ($type, @objects, %data);
+    my $slurped = 0;
+    my $bad = 0;
+
+    while (@ARGV) {
+        $_ = shift @ARGV;
+
+        if (/^-t$/) {
+            $bad = 1, last unless defined($type = get_type_argument());
+        }
+        elsif (/^-S$/) {
+            $bad = 1, last unless get_var_argument(\%data);
+        }
+        elsif (/^-([isl])$/) {
+            $data{format} = $1;
+        }
+        elsif (/^-$/ && !$slurped) {
+            chomp(my @lines = <STDIN>);
+            foreach (@lines) {
+                unless (is_object_spec($_, $type)) {
+                    whine "Invalid object on STDIN: '$_'.";
+                    $bad = 1; last;
+                }
+                push @objects, $_;
+            }
+            $slurped = 1;
+        }
+        elsif (/^-f$/) {
+            if ($ARGV[0] !~ /^(?:(?:$field,)*$field)$/) {
+                whine "No valid field list in '-f $ARGV[0]'.";
+                $bad = 1; last;
+            }
+            $data{fields} = shift @ARGV;
+        }
+        elsif (my $spec = is_object_spec($_, $type)) {
+            push @objects, $spec;
+        }
+        else {
+            my $datum = /^-/ ? "option" : "argument";
+            whine "Unrecognised $datum '$_'.";
+            $bad = 1; last;
+        }
+    }
+
+    unless (@objects) {
+        whine "No objects specified.";
+        $bad = 1;
+    }
+    return help("show", $type) if $bad;
+
+    my $r = submit("$REST/show", { id => \@objects, %data });
+    print $r->content;
+}
+
+# To create a new object, we ask the server for a form with the defaults
+# filled in, allow the user to edit it, and send the form back.
+#
+# To edit an object, we must ask the server for a form representing that
+# object, make changes requested by the user (either on the command line
+# or interactively via $EDITOR), and send the form back.
+
+sub edit {
+    my ($action) = @_;
+    my (%data, $type, @objects);
+    my ($cl, $text, $edit, $input, $output);
+
+    use vars qw(%set %add %del);
+    %set = %add = %del = ();
+    my $slurped = 0;
+    my $bad = 0;
+    
+    while (@ARGV) {
+        $_ = shift @ARGV;
+
+        if    (/^-e$/) { $edit = 1 }
+        elsif (/^-i$/) { $input = 1 }
+        elsif (/^-o$/) { $output = 1 }
+        elsif (/^-t$/) {
+            $bad = 1, last unless defined($type = get_type_argument());
+        }
+        elsif (/^-S$/) {
+            $bad = 1, last unless get_var_argument(\%data);
+        }
+        elsif (/^-$/ && !($slurped || $input)) {
+            chomp(my @lines = <STDIN>);
+            foreach (@lines) {
+                unless (is_object_spec($_, $type)) {
+                    whine "Invalid object on STDIN: '$_'.";
+                    $bad = 1; last;
+                }
+                push @objects, $_;
+            }
+            $slurped = 1;
+        }
+        elsif (/^set$/i) {
+            my $vars = 0;
+
+            while (@ARGV && $ARGV[0] =~ /^($field)([+-]?=)(.*)$/) {
+                my ($key, $op, $val) = ($1, $2, $3);
+                my $hash = ($op eq '=') ? \%set : ($op =~ /^\+/) ? \%add : \%del;
+
+                vpush($hash, lc $key, $val);
+                shift @ARGV;
+                $vars++;
+            }
+            unless ($vars) {
+                whine "No variables to set.";
+                $bad = 1; last;
+            }
+            $cl = $vars;
+        }
+        elsif (/^(?:add|del)$/i) {
+            my $vars = 0;
+            my $hash = ($_ eq "add") ? \%add : \%del;
+
+            while (@ARGV && $ARGV[0] =~ /^($field)=(.*)$/) {
+                my ($key, $val) = ($1, $2);
+
+                vpush($hash, lc $key, $val);
+                shift @ARGV;
+                $vars++;
+            }
+            unless ($vars) {
+                whine "No variables to set.";
+                $bad = 1; last;
+            }
+            $cl = $vars;
+        }
+        elsif (my $spec = is_object_spec($_, $type)) {
+            push @objects, $spec;
+        }
+        else {
+            my $datum = /^-/ ? "option" : "argument";
+            whine "Unrecognised $datum '$_'.";
+            $bad = 1; last;
+        }
+    }
+
+    if ($action =~ /^ed(?:it)?$/) {
+        unless (@objects) {
+            whine "No objects specified.";
+            $bad = 1;
+        }
+    }
+    else {
+        if (@objects) {
+            whine "You shouldn't specify objects as arguments to $action.";
+            $bad = 1;
+        }
+        unless ($type) {
+            whine "What type of object do you want to create?";
+            $bad = 1;
+        }
+        @objects = ("$type/new");
+    }
+    return help($action, $type) if $bad;
+
+    # We need a form to make changes to. We usually ask the server for
+    # one, but we can avoid that if we are fed one on STDIN, or if the
+    # user doesn't want to edit the form by hand, and the command line
+    # specifies only simple variable assignments.
+
+    if ($input) {
+        local $/ = undef;
+        $text = <STDIN>;
+    }
+    elsif ($edit || %add || %del || !$cl) {
+        my $r = submit("$REST/show", { id => \@objects, format => 'l' });
+        $text = $r->content;
+    }
+
+    # If any changes were specified on the command line, apply them.
+    if ($cl) {
+        if ($text) {
+            # We're updating forms from the server.
+            my $forms = Form::parse($text);
+
+            foreach my $form (@$forms) {
+                my ($c, $o, $k, $e) = @$form;
+                my ($key, $val);
+
+                next if ($e || !@$o);
+
+                local %add = %add;
+                local %del = %del;
+                local %set = %set;
+
+                # Make changes to existing fields.
+                foreach $key (@$o) {
+                    if (exists $add{lc $key}) {
+                        $val = delete $add{lc $key};
+                        vpush($k, $key, $val);
+                        $k->{$key} = vsplit($k->{$key}) if $val =~ /[,\n]/;
+                    }
+                    if (exists $del{lc $key}) {
+                        $val = delete $del{lc $key};
+                        my %val = map {$_=>1} @{ vsplit($val) };
+                        $k->{$key} = vsplit($k->{$key});
+                        @{$k->{$key}} = grep {!exists $val{$_}} @{$k->{$key}};
+                    }
+                    if (exists $set{lc $key}) {
+                        $k->{$key} = delete $set{lc $key};
+                    }
+                }
+                
+                # Then update the others.
+                foreach $key (keys %set) { vpush($k, $key, $set{$key}) }
+                foreach $key (keys %add) {
+                    vpush($k, $key, $add{$key});
+                    $k->{$key} = vsplit($k->{$key});
+                }
+                push @$o, (keys %add, keys %set);
+            }
+
+            $text = Form::compose($forms);
+        }
+        else {
+            # We're rolling our own set of forms.
+            my @forms;
+            foreach (@objects) {
+                my ($type, $ids, $args) =
+                    m{^($name)/($idlist|$labels)(?:(/.*))?$}o;
+
+                $args ||= "";
+                foreach my $obj (expand_list($ids)) {
+                    my %set = (%set, id => "$type/$obj$args");
+                    push @forms, ["", [keys %set], \%set];
+                }
+            }
+            $text = Form::compose(\@forms);
+        }
+    }
+
+    if ($output) {
+        print $text;
+        return;
+    }
+
+    my $synerr = 0;
+
+EDIT:
+    # We'll let the user edit the form before sending it to the server,
+    # unless we have enough information to submit it non-interactively.
+    if ($edit || (!$input && !$cl)) {
+        my $newtext = vi($text);
+        # We won't resubmit a bad form unless it was changed.
+        $text = ($synerr && $newtext eq $text) ? undef : $newtext;
+    }
+
+    if ($text) {
+        my $r = submit("$REST/edit", {content => $text, %data});
+        if ($r->code == 409) {
+            # If we submitted a bad form, we'll give the user a chance
+            # to correct it and resubmit.
+            if ($edit || (!$input && !$cl)) {
+                $text = $r->content;
+                $synerr = 1;
+                goto EDIT;
+            }
+            else {
+                print $r->content;
+                return;
+            }
+        }
+        print $r->content;
+    }
+}
+
+# We roll "comment" and "correspond" into the same handler.
+
+sub comment {
+    my ($action) = @_;
+    my (%data, $id, @files, @bcc, @cc, $msg, $wtime, $edit);
+    my $bad = 0;
+
+    while (@ARGV) {
+        $_ = shift @ARGV;
+
+        if (/^-e$/) {
+            $edit = 1;
+        }
+        elsif (/^-[abcmw]$/) {
+            unless (@ARGV) {
+                whine "No argument specified with $_.";
+                $bad = 1; last;
+            }
+
+            if (/-a/) {
+                unless (-f $ARGV[0] && -r $ARGV[0]) {
+                    whine "Cannot read attachment: '$ARGV[0]'.";
+                    return;
+                }
+                push @files, shift @ARGV;
+            }
+            elsif (/-([bc])/) {
+                my $a = $_ eq "-b" ? \@bcc : \@cc;
+                @$a = split /\s*,\s*/, shift @ARGV;
+            }
+            elsif (/-m/) { $msg = shift @ARGV }
+            elsif (/-w/) { $wtime = shift @ARGV }
+        }
+        elsif (!$id && m|^(?:ticket/)?($idlist)$|) {
+            $id = $1;
+        }
+        else {
+            my $datum = /^-/ ? "option" : "argument";
+            whine "Unrecognised $datum '$_'.";
+            $bad = 1; last;
+        }
+    }
+
+    unless ($id) {
+        whine "No object specified.";
+        $bad = 1;
+    }
+    return help($action, "ticket") if $bad;
+
+    my $form = [
+        "",
+        [ "Ticket", "Action", "Cc", "Bcc", "Attachment", "TimeWorked", "Text" ],
+        {
+            Ticket     => $id,
+            Action     => $action,
+            Cc         => [ @cc ],
+            Bcc        => [ @bcc ],
+            Attachment => [ @files ],
+            TimeWorked => $wtime || '',
+            Text       => $msg || '',
+            Status => ''
+        }
+    ];
+
+    my $text = Form::compose([ $form ]);
+
+    if ($edit || !$msg) {
+        my $error = 0;
+        my ($c, $o, $k, $e);
+
+        do {
+            my $ntext = vi($text);
+            return if ($error && $ntext eq $text);
+            $text = $ntext;
+            $form = Form::parse($text);
+            $error = 0;
+
+            ($c, $o, $k, $e) = @{ $form->[0] };
+            if ($e) {
+                $error = 1;
+                $c = "# Syntax error.";
+                goto NEXT;
+            }
+            elsif (!@$o) {
+                return;
+            }
+            @files = @{ vsplit($k->{Attachment}) };
+
+        NEXT:
+            $text = Form::compose([[$c, $o, $k, $e]]);
+        } while ($error);
+    }
+
+    my $i = 1;
+    foreach my $file (@files) {
+        $data{"attachment_$i"} = bless([ $file ], "Attachment");
+        $i++;
+    }
+    $data{content} = $text;
+
+    my $r = submit("$REST/ticket/comment/$id", \%data);
+    print $r->content;
+}
+
+# Merge one ticket into another.
+
+sub merge {
+    my @id;
+    my $bad = 0;
+
+    while (@ARGV) {
+        $_ = shift @ARGV;
+
+        if (/^\d+$/) {
+            push @id, $_;
+        }
+        else {
+            whine "Unrecognised argument: '$_'.";
+            $bad = 1; last;
+        }
+    }
+
+    unless (@id == 2) {
+        my $evil = @id > 2 ? "many" : "few";
+        whine "Too $evil arguments specified.";
+        $bad = 1;
+    }
+    return help("merge", "ticket") if $bad;
+
+    my $r = submit("$REST/ticket/merge/$id[0]", {into => $id[1]});
+    print $r->content;
+}
+
+# Link one ticket to another.
+
+sub link {
+    my ($bad, $del, %data) = (0, 0, ());
+    my %ltypes = map { lc $_ => $_ } qw(DependsOn DependedOnBy RefersTo
+                                        ReferredToBy HasMember MemberOf);
+
+    while (@ARGV && $ARGV[0] =~ /^-/) {
+        $_ = shift @ARGV;
+
+        if (/^-d$/) {
+            $del = 1;
+        }
+        else {
+            whine "Unrecognised option: '$_'.";
+            $bad = 1; last;
+        }
+    }
+
+    if (@ARGV == 3) {
+        my ($from, $rel, $to) = @ARGV;
+        if ($from !~ /^\d+$/ || $to !~ /^\d+$/) {
+            my $bad = $from =~ /^\d+$/ ? $to : $from;
+            whine "Invalid ticket ID '$bad' specified.";
+            $bad = 1;
+        }
+        unless (exists $ltypes{lc $rel}) {
+            whine "Invalid relationship '$rel' specified.";
+            $bad = 1;
+        }
+        %data = (id => $from, rel => $rel, to => $to, del => $del);
+    }
+    else {
+        my $bad = @ARGV < 3 ? "few" : "many";
+        whine "Too $bad arguments specified.";
+        $bad = 1;
+    }
+    return help("link", "ticket") if $bad;
+
+    my $r = submit("$REST/ticket/link", \%data);
+    print $r->content;
+}
+
+# Grant/revoke a user's rights.
+
+sub grant {
+    my ($cmd) = @_;
+
+    my $revoke = 0;
+    while (@ARGV) {
+    }
+
+    $revoke = 1 if $cmd->{action} eq 'revoke';
+}
+
+# Client <-> Server communication.
+# --------------------------------
+#
+# This function composes and sends an HTTP request to the RT server, and
+# interprets the response. It takes a request URI, and optional request
+# data (a string, or a reference to a set of key-value pairs).
+
+sub submit {
+    my ($uri, $content) = @_;
+    my ($req, $data);
+    my $ua = new LWP::UserAgent(agent => "RT/3.0b", env_proxy => 1);
+
+    # Did the caller specify any data to send with the request?
+    $data = [];
+    if (defined $content) {
+        unless (ref $content) {
+            # If it's just a string, make sure LWP handles it properly.
+            # (By pretending that it's a file!)
+            $content = [ content => [undef, "", Content => $content] ];
+        }
+        elsif (ref $content eq 'HASH') {
+            my @data;
+            foreach my $k (keys %$content) {
+                if (ref $content->{$k} eq 'ARRAY') {
+                    foreach my $v (@{ $content->{$k} }) {
+                        push @data, $k, $v;
+                    }
+                }
+                else { push @data, $k, $content->{$k} }
+            }
+            $content = \@data;
+        }
+        $data = $content;
+    }
+
+    # Should we send authentication information to start a new session?
+    if (!defined $session->cookie) {
+        push @$data, ( user => $config{user} );
+        push @$data, ( pass => $config{passwd} || read_passwd() );
+    }
+
+    # Now, we construct the request.
+    if (@$data) {
+        $req = POST($uri, $data, Content_Type => 'form-data');
+    }
+    else {
+        $req = GET($uri);
+    }
+    $session->add_cookie_header($req);
+
+    # Then we send the request and parse the response.
+    DEBUG(3, $req->as_string);
+    my $res = $ua->request($req);
+    DEBUG(3, $res->as_string);
+
+    if ($res->is_success) {
+        # The content of the response we get from the RT server consists
+        # of an HTTP-like status line followed by optional header lines,
+        # a blank line, and arbitrary text.
+
+        my ($head, $text) = split /\n\n/, $res->content, 2;
+        my ($status, @headers) = split /\n/, $head;
+        $text =~ s/\n*$/\n/;
+
+        # "RT/3.0.1 401 Credentials required"
+        if ($status !~ m#^RT/\d+(?:\.\d+)+(?:-?\w+)? (\d+) ([\w\s]+)$#) {
+            warn "rt: Malformed RT response from $config{server}.\n";
+            warn "(Rerun with RTDEBUG=3 for details.)\n" if $config{debug} < 3;
+            exit -1;
+        }
+
+        # Our caller can pretend that the server returned a custom HTTP
+        # response code and message. (Doing that directly is apparently
+        # not sufficiently portable and uncomplicated.)
+        $res->code($1);
+        $res->message($2);
+        $res->content($text);
+        $session->update($res) if ($res->is_success || $res->code != 401);
+
+        if (!$res->is_success) {
+            # We can deal with authentication failures ourselves. Either
+            # we sent invalid credentials, or our session has expired.
+            if ($res->code == 401) {
+                my %d = @$data;
+                if (exists $d{user}) {
+                    warn "rt: Incorrect username or password.\n";
+                    exit -1;
+                }
+                elsif ($req->header("Cookie")) {
+                    # We'll retry the request with credentials, unless
+                    # we only wanted to logout in the first place.
+                    $session->delete;
+                    return submit(@_) unless $uri eq "$REST/logout";
+                }
+            }
+            # Conflicts should be dealt with by the handler and user.
+            # For anything else, we just die.
+            elsif ($res->code != 409) {
+                warn "rt: ", $res->content;
+                exit;
+            }
+        }
+    }
+    else {
+        warn "rt: Server error: ", $res->message, " (", $res->code, ")\n";
+        exit -1;
+    }
+
+    return $res;
+}
+
+# Session management.
+# -------------------
+#
+# Maintains a list of active sessions in the ~/.rt_sessions file.
+{
+    package Session;
+    my ($s, $u);
+
+    # Initialises the session cache.
+    sub new {
+        my ($class, $file) = @_;
+        my $self = {
+            file => $file || "$HOME/.rt_sessions",
+            sids => { }
+        };
+       
+        # The current session is identified by the currently configured
+        # server and user.
+        ($s, $u) = @config{"server", "user"};
+
+        bless $self, $class;
+        $self->load();
+
+        return $self;
+    }
+
+    # Returns the current session cookie.
+    sub cookie {
+        my ($self) = @_;
+        my $cookie = $self->{sids}{$s}{$u};
+        return defined $cookie ? "RT_SID=$cookie" : undef;
+    }
+
+    # Deletes the current session cookie.
+    sub delete {
+        my ($self) = @_;
+        delete $self->{sids}{$s}{$u};
+    }
+
+    # Adds a Cookie header to an outgoing HTTP request.
+    sub add_cookie_header {
+        my ($self, $request) = @_;
+        my $cookie = $self->cookie();
+
+        $request->header(Cookie => $cookie) if defined $cookie;
+    }
+
+    # Extracts the Set-Cookie header from an HTTP response, and updates
+    # session information accordingly.
+    sub update {
+        my ($self, $response) = @_;
+        my $cookie = $response->header("Set-Cookie");
+
+        if (defined $cookie && $cookie =~ /^RT_SID=([0-9A-Fa-f]+);/) {
+            $self->{sids}{$s}{$u} = $1;
+        }
+    }
+
+    # Loads the session cache from the specified file.
+    sub load {
+        my ($self, $file) = @_;
+        $file ||= $self->{file};
+        local *F;
+
+        open(F, $file) && do {
+            $self->{file} = $file;
+            my $sids = $self->{sids} = {};
+            while (<F>) {
+                chomp;
+                next if /^$/ || /^#/;
+                next unless m#^https?://[^ ]+ \w+ [0-9A-Fa-f]+$#;
+                my ($server, $user, $cookie) = split / /, $_;
+                $sids->{$server}{$user} = $cookie;
+            }
+            return 1;
+        };
+        return 0;
+    }
+
+    # Writes the current session cache to the specified file.
+    sub save {
+        my ($self, $file) = shift;
+        $file ||= $self->{file};
+        local *F;
+
+        open(F, ">$file") && do {
+            my $sids = $self->{sids};
+            foreach my $server (keys %$sids) {
+                foreach my $user (keys %{ $sids->{$server} }) {
+                    my $sid = $sids->{$server}{$user};
+                    if (defined $sid) {
+                        print F "$server $user $sid\n";
+                    }
+                }
+            }
+            close(F);
+            chmod 0600, $file;
+            return 1;
+        };
+        return 0;
+    }
+
+    sub DESTROY {
+        my $self = shift;
+        $self->save;
+    }
+}
+
+# Form handling.
+# --------------
+#
+# Forms are RFC822-style sets of (field, value) specifications with some
+# initial comments and interspersed blank lines allowed for convenience.
+# Sets of forms are separated by --\n (in a cheap parody of MIME).
+#
+# Each form is parsed into an array with four elements: commented text
+# at the start of the form, an array with the order of keys, a hash with
+# key/value pairs, and optional error text if the form syntax was wrong.
+
+# Returns a reference to an array of parsed forms.
+sub Form::parse {
+    my $state = 0;
+    my @forms = ();
+    my @lines = split /\n/, $_[0];
+    my ($c, $o, $k, $e) = ("", [], {}, "");
+
+    LINE:
+    while (@lines) {
+        my $line = shift @lines;
+
+        next LINE if $line eq '';
+
+        if ($line eq '--') {
+            # We reached the end of one form. We'll ignore it if it was
+            # empty, and store it otherwise, errors and all.
+            if ($e || $c || @$o) {
+                push @forms, [ $c, $o, $k, $e ];
+                $c = ""; $o = []; $k = {}; $e = "";
+            }
+            $state = 0;
+        }
+        elsif ($state != -1) {
+            if ($state == 0 && $line =~ /^#/) {
+                # Read an optional block of comments (only) at the start
+                # of the form.
+                $state = 1;
+                $c = $line;
+                while (@lines && $lines[0] =~ /^#/) {
+                    $c .= "\n".shift @lines;
+                }
+                $c .= "\n";
+            }
+            elsif ($state <= 1 && $line =~ /^($field):(?:\s+(.*))?$/) {
+                # Read a field: value specification.
+                my $f  = $1;
+                my @v  = ($2 || ());
+
+                # Read continuation lines, if any.
+                while (@lines && ($lines[0] eq '' || $lines[0] =~ /^\s+/)) {
+                    push @v, shift @lines;
+                }
+                pop @v while (@v && $v[-1] eq '');
+
+                # Strip longest common leading indent from text.
+                my $ws = "";
+                foreach my $ls (map {/^(\s+)/} @v[1..$#v]) {
+                    $ws = $ls if (!$ws || length($ls) < length($ws));
+                }
+                s/^$ws// foreach @v;
+
+                push(@$o, $f) unless exists $k->{$f};
+                vpush($k, $f, join("\n", @v));
+
+                $state = 1;
+            }
+            elsif ($line !~ /^#/) {
+                # We've found a syntax error, so we'll reconstruct the
+                # form parsed thus far, and add an error marker. (>>)
+                $state = -1;
+                $e = Form::compose([[ "", $o, $k, "" ]]);
+                $e.= $line =~ /^>>/ ? "$line\n" : ">> $line\n";
+            }
+        }
+        else {
+            # We saw a syntax error earlier, so we'll accumulate the
+            # contents of this form until the end.
+            $e .= "$line\n";
+        }
+    }
+    push(@forms, [ $c, $o, $k, $e ]) if ($e || $c || @$o);
+
+    foreach my $l (keys %$k) {
+        $k->{$l} = vsplit($k->{$l}) if (ref $k->{$l} eq 'ARRAY');
+    }
+
+    return \@forms;
+}
+
+# Returns text representing a set of forms.
+sub Form::compose {
+    my ($forms) = @_;
+    my @text;
+
+    foreach my $form (@$forms) {
+        my ($c, $o, $k, $e) = @$form;
+        my $text = "";
+
+        if ($c) {
+            $c =~ s/\n*$/\n/;
+            $text = "$c\n";
+        }
+        if ($e) {
+            $text .= $e;
+        }
+        elsif ($o) {
+            my @lines;
+
+            foreach my $key (@$o) {
+                my ($line, $sp);
+                my $v = $k->{$key};
+                my @values = ref $v eq 'ARRAY' ? @$v : $v;
+
+                $sp = " "x(length("$key: "));
+                $sp = " "x4 if length($sp) > 16;
+
+                foreach $v (@values) {
+                    if ($v =~ /\n/) {
+                        $v =~ s/^/$sp/gm;
+                        $v =~ s/^$sp//;
+
+                        if ($line) {
+                            push @lines, "$line\n\n";
+                            $line = "";
+                        }
+                        elsif (@lines && $lines[-1] !~ /\n\n$/) {
+                            $lines[-1] .= "\n";
+                        }
+                        push @lines, "$key: $v\n\n";
+                    }
+                    elsif ($line &&
+                           length($line)+length($v)-rindex($line, "\n") >= 70)
+                    {
+                        $line .= ",\n$sp$v";
+                    }
+                    else {
+                        $line = $line ? "$line, $v" : "$key: $v";
+                    }
+                }
+
+                $line = "$key:" unless @values;
+                if ($line) {
+                    if ($line =~ /\n/) {
+                        if (@lines && $lines[-1] !~ /\n\n$/) {
+                            $lines[-1] .= "\n";
+                        }
+                        $line .= "\n";
+                    }
+                    push @lines, "$line\n";
+                }
+            }
+
+            $text .= join "", @lines;
+        }
+        else {
+            chomp $text;
+        }
+        push @text, $text;
+    }
+
+    return join "\n--\n\n", @text;
+}
+
+# Configuration.
+# --------------
+
+# Returns configuration information from the environment.
+sub config_from_env {
+    my %env;
+
+    foreach my $k ("DEBUG", "USER", "PASSWD", "SERVER") {
+        if (exists $ENV{"RT$k"}) {
+            $env{lc $k} = $ENV{"RT$k"};
+        }
+    }
+
+    return %env;
+}
+
+# Finds a suitable configuration file and returns information from it.
+sub config_from_file {
+    my ($rc) = @_;
+
+    if ($rc =~ m#^/#) {
+        # We'll use an absolute path if we were given one.
+        return parse_config_file($rc);
+    }
+    else {
+        # Otherwise we'll use the first file we can find in the current
+        # directory, or in one of its (increasingly distant) ancestors.
+
+        my @dirs = split /\//, cwd;
+        while (@dirs) {
+            my $file = join('/', @dirs, $rc);
+            if (-r $file) {
+                return parse_config_file($file);
+            }
+
+            # Remove the last directory component each time.
+            pop @dirs;
+        }
+
+        # Still nothing? We'll fall back to some likely defaults.
+        for ("$HOME/$rc", "/etc/rt.conf") {
+            return parse_config_file($_) if (-r $_);
+        }
+    }
+
+    return ();
+}
+
+# Makes a hash of the specified configuration file.
+sub parse_config_file {
+    my %cfg;
+    my ($file) = @_;
+
+    open(CFG, $file) && do {
+        while (<CFG>) {
+            chomp;
+            next if (/^#/ || /^\s*$/);
+
+            if (/^(user|passwd|server)\s+([^ ]+)$/) {
+                $cfg{$1} = $2;
+            }
+            else {
+                die "rt: $file:$.: unknown configuration directive.\n";
+            }
+        }
+    };
+
+    return %cfg;
+}
+
+# Helper functions.
+# -----------------
+
+sub whine {
+    my $sub = (caller(1))[3];
+    $sub =~ s/^main:://;
+    warn "rt: $sub: @_\n";
+    return;
+}
+
+sub read_passwd {
+    eval 'require Term::ReadKey';
+    if ($@) {
+        die "No password specified (and Term::ReadKey not installed).\n";
+    }
+
+    print "Password: ";
+    Term::ReadKey::ReadMode('noecho');
+    chomp(my $passwd = Term::ReadKey::ReadLine(0));
+    Term::ReadKey::ReadMode('restore');
+    print "\n";
+
+    return $passwd;
+}
+
+sub vi {
+    my ($text) = @_;
+    my $file = "/tmp/rt.form.$$";
+    my $editor = $ENV{EDITOR} || $ENV{VISUAL} || "vi";
+
+    local *F;
+    local $/ = undef;
+
+    open(F, ">$file") || die "$file: $!\n"; print F $text; close(F);
+    system($editor, $file) && die "Couldn't run $editor.\n";
+    open(F, $file) || die "$file: $!\n"; $text = <F>; close(F);
+    unlink($file);
+
+    return $text;
+}
+
+# Add a value to a (possibly multi-valued) hash key.
+sub vpush {
+    my ($hash, $key, $val) = @_;
+    my @val = ref $val eq 'ARRAY' ? @$val : $val;
+
+    if (exists $hash->{$key}) {
+        unless (ref $hash->{$key} eq 'ARRAY') {
+            my @v = $hash->{$key} ne '' ? $hash->{$key} : ();
+            $hash->{$key} = \@v;
+        }
+        push @{ $hash->{$key} }, @val;
+    }
+    else {
+        $hash->{$key} = $val;
+    }
+}
+
+# "Normalise" a hash key that's known to be multi-valued.
+sub vsplit {
+    my ($val) = @_;
+    my ($word, @words);
+    my @values = ref $val eq 'ARRAY' ? @$val : $val;
+
+    foreach my $line (map {split /\n/} @values) {
+        # XXX: This should become a real parser, à la Text::ParseWords.
+        $line =~ s/^\s+//;
+        $line =~ s/\s+$//;
+        push @words, split /\s*,\s*/, $line;
+    }
+
+    return \@words;
+}
+
+sub expand_list {
+    my ($list) = @_;
+    my ($elt, @elts, %elts);
+
+    foreach $elt (split /,/, $list) {
+        if ($elt =~ /^(\d+)-(\d+)$/) { push @elts, ($1..$2) }
+        else                         { push @elts, $elt }
+    }
+
+    @elts{@elts}=();
+    return sort {$a<=>$b} keys %elts;
+}
+
+sub get_type_argument {
+    my $type;
+
+    if (@ARGV) {
+        $type = shift @ARGV;
+        unless ($type =~ /^[A-Za-z0-9_.-]+$/) {
+            # We want whine to mention our caller, not us.
+            @_ = ("Invalid type '$type' specified.");
+            goto &whine;
+        }
+    }
+    else {
+        @_ = ("No type argument specified with -t.");
+        goto &whine;
+    }
+
+    $type =~ s/s$//; # "Plural". Ugh.
+    return $type;
+}
+
+sub get_var_argument {
+    my ($data) = @_;
+
+    if (@ARGV) {
+        my $kv = shift @ARGV;
+        if (my ($k, $v) = $kv =~ /^($field)=(.*)$/) {
+            push @{ $data->{$k} }, $v;
+        }
+        else {
+            @_ = ("Invalid variable specification: '$kv'.");
+            goto &whine;
+        }
+    }
+    else {
+        @_ = ("No variable argument specified with -S.");
+        goto &whine;
+    }
+}
+
+sub is_object_spec {
+    my ($spec, $type) = @_;
+
+    $spec =~ s|^(?:$type/)?|$type/| if defined $type;
+    return $spec if ($spec =~ m{^$name/(?:$idlist|$labels)(?:/.*)?$}o);
+    return;
+}
+
+__DATA__
+
+Title: intro
+Title: introduction
+Text:
+
+    ** THIS IS AN UNSUPPORTED PREVIEW RELEASE **
+    ** PLEASE REPORT BUGS TO rt-bugs at fsck.com **
+
+    This is a command-line interface to RT 3.
+
+    It allows you to interact with an RT server over HTTP, and offers an
+    interface to RT's functionality that is better-suited to automation
+    and integration with other tools.
+
+    In general, each invocation of this program should specify an action
+    to perform on one or more objects, and any other arguments required
+    to complete the desired action.
+
+    For more information:
+
+        - rt help actions       (a list of possible actions)
+        - rt help objects       (how to specify objects)
+        - rt help usage         (syntax information)
+
+        - rt help config        (configuration details)
+        - rt help examples      (a few useful examples)
+        - rt help topics        (a list of help topics)
+
+--
+
+Title: usage
+Title: syntax
+Text:
+
+    Syntax:
+
+        rt <action> [options] [arguments]
+
+    Each invocation of this program must specify an action (e.g. "edit",
+    "create"), options to modify behaviour, and other arguments required
+    by the specified action. (For example, most actions expect a list of
+    numeric object IDs to act upon.)
+
+    The details of the syntax and arguments for each action are given by
+    "rt help <action>". Some actions may be referred to by more than one
+    name ("create" is the same as "new", for example).  
+
+    Objects are identified by a type and an ID (which can be a name or a
+    number, depending on the type). For some actions, the object type is
+    implied (you can only comment on tickets); for others, the user must
+    specify it explicitly. See "rt help objects" for details.
+
+    In syntax descriptions, mandatory arguments that must be replaced by
+    appropriate value are enclosed in <>, and optional arguments are
+    indicated by [] (for example, <action> and [options] above).
+
+    For more information:
+
+        - rt help objects       (how to specify objects)
+        - rt help actions       (a list of actions)
+        - rt help types         (a list of object types)
+
+--
+
+Title: conf
+Title: config
+Title: configuration
+Text:
+
+    This program has two major sources of configuration information: its
+    configuration files, and the environment.
+
+    The program looks for configuration directives in a file named .rtrc
+    (or $RTCONFIG; see below) in the current directory, and then in more
+    distant ancestors, until it reaches /. If no suitable configuration
+    files are found, it will also check for ~/.rtrc and /etc/rt.conf.
+
+    Configuration directives:
+
+        The following directives may occur, one per line:
+
+        - server <URL>          URL to RT server.
+        - user <username>       RT username.
+        - passwd <passwd>       RT user's password.
+
+        Blank and #-commented lines are ignored.
+
+    Environment variables:
+
+        The following environment variables override any corresponding
+        values defined in configuration files:
+
+        - RTUSER
+        - RTPASSWD
+        - RTSERVER
+        - RTDEBUG       Numeric debug level. (Set to 3 for full logs.)
+        - RTCONFIG      Specifies a name other than ".rtrc" for the
+                        configuration file.
+
+--
+
+Title: objects
+Text:
+
+    Syntax:
+
+        <type>/<id>[/<attributes>]
+
+    Every object in RT has a type (e.g. "ticket", "queue") and a numeric
+    ID. Some types of objects can also be identified by name (like users
+    and queues). Furthermore, objects may have named attributes (such as
+    "ticket/1/history").
+
+    An object specification is like a path in a virtual filesystem, with
+    object types as top-level directories, object IDs as subdirectories,
+    and named attributes as further subdirectories.
+
+    A comma-separated list of names, numeric IDs, or numeric ranges can
+    be used to specify more than one object of the same type. Note that
+    the list must be a single argument (i.e., no spaces). For example,
+    "user/root,1-3,5,7-10,ams" is a list of ten users; the same list
+    can also be written as "user/ams,root,1,2,3,5,7,8-20".
+    
+    Examples:
+
+        ticket/1
+        ticket/1/attachments
+        ticket/1/attachments/3
+        ticket/1/attachments/3/content
+        ticket/1-3/links
+        ticket/1-3,5-7/history
+
+        user/ams
+        user/ams/rights
+        user/ams,rai,1/rights
+
+    For more information:
+
+        - rt help <action>      (action-specific details)
+        - rt help <type>        (type-specific details)
+
+--
+
+Title: actions
+Title: commands
+Text:
+
+    You can currently perform the following actions on all objects:
+
+        - list          (list objects matching some condition)
+        - show          (display object details)
+        - edit          (edit object details)
+        - create        (create a new object)
+
+    Each type may define actions specific to itself; these are listed in
+    the help item about that type.
+
+    For more information:
+
+        - rt help <action>      (action-specific details)
+        - rt help types         (a list of possible types)
+
+--
+
+Title: types
+Text:
+
+    You can currently operate on the following types of objects:
+
+        - tickets
+        - users
+        - groups
+        - queues
+
+    For more information:
+
+        - rt help <type>        (type-specific details)
+        - rt help objects       (how to specify objects)
+        - rt help actions       (a list of possible actions)
+
+--
+
+Title: ticket
+Text:
+
+    Tickets are identified by a numeric ID.
+
+    The following generic operations may be performed upon tickets:
+
+        - list
+        - show
+        - edit
+        - create
+
+    In addition, the following ticket-specific actions exist:
+
+        - link
+        - merge
+        - comment
+        - correspond
+
+    Attributes:
+
+        The following attributes can be used with "rt show" or "rt edit"
+        to retrieve or edit other information associated with tickets:
+
+        links                      A ticket's relationships with others.
+        history                    All of a ticket's transactions.
+        history/type/<type>        Only a particular type of transaction.
+        history/id/<id>            Only the transaction of the specified id.
+        attachments                A list of attachments.
+        attachments/<id>           The metadata for an individual attachment.
+        attachments/<id>/content   The content of an individual attachment.
+
+--
+
+Title: user
+Title: group
+Text:
+
+    Users and groups are identified by name or numeric ID.
+
+    The following generic operations may be performed upon them:
+
+        - list
+        - show
+        - edit
+        - create
+
+    In addition, the following type-specific actions exist:
+
+        - grant
+        - revoke
+
+    Attributes:
+
+        The following attributes can be used with "rt show" or "rt edit"
+        to retrieve or edit other information associated with users and
+        groups:
+
+        rights                  Global rights granted to this user.
+        rights/<queue>          Queue rights for this user.
+
+--
+
+Title: queue
+Text:
+
+    Queues are identified by name or numeric ID.
+
+    Currently, they can be subjected to the following actions:
+
+        - show
+        - edit
+        - create
+
+--
+
+Title: logout
+Text:
+
+    Syntax:
+
+        rt logout
+
+    Terminates the currently established login session. You will need to
+    provide authentication credentials before you can continue using the
+    server. (See "rt help config" for details about authentication.)
+
+--
+
+Title: ls
+Title: list
+Title: search
+Text:
+
+    Syntax:
+
+        rt <ls|list|search> [options] "query string"
+
+    Displays a list of objects matching the specified conditions.
+    ("ls", "list", and "search" are synonyms.)
+
+    Conditions are expressed in the SQL-like syntax used internally by
+    RT3. (For more information, see "rt help query".) The query string
+    must be supplied as one argument.
+
+    (Right now, the server doesn't support listing anything but tickets.
+    Other types will be supported in future; this client will be able to
+    take advantage of that support without any changes.)
+
+    Options:
+
+        The following options control how much information is displayed
+        about each matching object:
+
+        -i      Numeric IDs only. (Useful for |rt edit -; see examples.)
+        -s      Short description.
+        -l      Longer description.
+
+        In addition,
+        
+        -o +/-<field>   Orders the returned list by the specified field.
+        -S var=val      Submits the specified variable with the request.
+        -t type         Specifies the type of object to look for. (The
+                        default is "ticket".)
+
+    Examples:
+
+        rt ls "Priority > 5 and Status='new'"
+        rt ls -o +Subject "Priority > 5 and Status='new'"
+        rt ls -o -Created "Priority > 5 and Status='new'"
+        rt ls -i "Priority > 5"|rt edit - set status=resolved
+        rt ls -t ticket "Subject like '[PATCH]%'"
+
+--
+
+Title: show
+Text:
+
+    Syntax:
+
+        rt show [options] <object-ids>
+
+    Displays details of the specified objects.
+
+    For some types, object information is further classified into named
+    attributes (for example, "1-3/links" is a valid ticket specification
+    that refers to the links for tickets 1-3). Consult "rt help <type>"
+    and "rt help objects" for further details.
+
+    This command writes a set of forms representing the requested object
+    data to STDOUT.
+
+    Options:
+
+        -               Read IDs from STDIN instead of the command-line.
+        -t type         Specifies object type.
+        -f a,b,c        Restrict the display to the specified fields.
+        -S var=val      Submits the specified variable with the request.
+
+    Examples:
+
+        rt show -t ticket -f id,subject,status 1-3
+        rt show ticket/3/attachments/29
+        rt show ticket/3/attachments/29/content
+        rt show ticket/1-3/links
+        rt show -t user 2
+
+--
+
+Title: new
+Title: edit
+Title: create
+Text:
+
+    Syntax:
+
+        rt edit [options] <object-ids> set field=value [field=value] ...
+                                       add field=value [field=value] ...
+                                       del field=value [field=value] ...
+
+    Edits information corresponding to the specified objects.
+
+    If, instead of "edit", an action of "new" or "create" is specified,
+    then a new object is created. In this case, no numeric object IDs
+    may be specified, but the syntax and behaviour remain otherwise
+    unchanged.
+
+    This command typically starts an editor to allow you to edit object
+    data in a form for submission. If you specified enough information
+    on the command-line, however, it will make the submission directly.
+
+    The command line may specify field-values in three different ways.
+    "set" sets the named field to the given value, "add" adds a value
+    to a multi-valued field, and "del" deletes the corresponding value.
+    Each "field=value" specification must be given as a single argument.
+
+    For some types, object information is further classified into named
+    attributes (for example, "1-3/links" is a valid ticket specification
+    that refers to the links for tickets 1-3). These attributes may also
+    be edited. Consult "rt help <type>" and "rt help object" for further
+    details.
+
+    Options:
+
+        -       Read numeric IDs from STDIN instead of the command-line.
+                (Useful with rt ls ... | rt edit -; see examples below.)
+        -i      Read a completed form from STDIN before submitting.
+        -o      Dump the completed form to STDOUT instead of submitting.
+        -e      Allows you to edit the form even if the command-line has
+                enough information to make a submission directly.
+        -S var=val
+                Submits the specified variable with the request.
+        -t type Specifies object type.
+
+    Examples:
+
+        # Interactive (starts $EDITOR with a form).
+        rt edit ticket/3
+        rt create -t ticket
+
+        # Non-interactive.
+        rt edit ticket/1-3 add cc=foo at example.com set priority=3
+        rt ls -t tickets -i 'Priority > 5' | rt edit - set status=resolved
+        rt edit ticket/4 set priority=3 owner=bar at example.com \
+                         add cc=foo at example.com bcc=quux at example.net
+        rt create -t ticket subject='new ticket' priority=10 \
+                            add cc=foo at example.com
+
+--
+
+Title: comment
+Title: correspond
+Text:
+
+    Syntax:
+
+        rt <comment|correspond> [options] <ticket-id>
+
+    Adds a comment (or correspondence) to the specified ticket (the only
+    difference being that comments aren't sent to the requestors.)
+
+    This command will typically start an editor and allow you to type a
+    comment into a form. If, however, you specified all the necessary
+    information on the command line, it submits the comment directly.
+
+    (See "rt help forms" for more information about forms.)
+
+    Options:
+
+        -m <text>       Specify comment text.
+        -a <file>       Attach a file to the comment. (May be used more
+                        than once to attach multiple files.)
+        -c <addrs>      A comma-separated list of Cc addresses.
+        -b <addrs>      A comma-separated list of Bcc addresses.
+        -w <time>       Specify the time spent working on this ticket.
+        -e              Starts an editor before the submission, even if
+                        arguments from the command line were sufficient.
+
+    Examples:
+
+        rt comment -t 'Not worth fixing.' -a stddisclaimer.h 23
+
+--
+
+Title: merge
+Text:
+
+    Syntax:
+
+        rt merge <from-id> <to-id>
+
+    Merges the two specified tickets.
+
+--
+
+Title: link
+Text:
+
+    Syntax:
+
+        rt link [-d] <id-A> <relationship> <id-B>
+
+    Creates (or, with -d, deletes) a link between the specified tickets.
+    The relationship can (irrespective of case) be any of:
+
+        DependsOn/DependedOnBy:     A depends upon B (or vice versa).
+        RefersTo/ReferredToBy:      A refers to B (or vice versa).
+        MemberOf/HasMember:         A is a member of B (or vice versa).
+
+    To view a ticket's relationships, use "rt show ticket/3/links". (See
+    "rt help ticket" and "rt help show".)
+
+    Options:
+
+        -d      Deletes the specified link.
+
+    Examples:
+
+        rt link 2 dependson 3
+        rt link -d 4 referredtoby 6     # 6 no longer refers to 4
+
+--
+
+Title: grant
+Title: revoke
+Text:
+
+--
+
+Title: query
+Text:
+
+    RT3 uses an SQL-like syntax to specify object selection constraints.
+    See the <RT:...> documentation for details.
+    
+    (XXX: I'm going to have to write it, aren't I?)
+
+--
+
+Title: form
+Title: forms
+Text:
+
+    This program uses RFC822 header-style forms to represent object data
+    in a form that's suitable for processing both by humans and scripts.
+
+    A form is a set of (field, value) specifications, with some initial
+    commented text and interspersed blank lines allowed for convenience.
+    Field names may appear more than once in a form; a comma-separated
+    list of multiple field values may also be specified directly.
+    
+    Field values can be wrapped as in RFC822, with leading whitespace.
+    The longest sequence of leading whitespace common to all the lines
+    is removed (preserving further indentation). There is no limit on
+    the length of a value.
+
+    Multiple forms are separated by a line containing only "--\n".
+
+    (XXX: A more detailed specification will be provided soon. For now,
+    the server-side syntax checking will suffice.)
+
+--
+
+Title: topics
+Text:
+
+    Use "rt help <topic>" for help on any of the following subjects:
+
+        - tickets, users, groups, queues.
+        - show, edit, ls/list/search, new/create.
+
+        - query                                 (search query syntax)
+        - forms                                 (form specification)
+
+        - objects                               (how to specify objects)
+        - types                                 (a list of object types)
+        - actions/commands                      (a list of actions)
+        - usage/syntax                          (syntax details)
+        - conf/config/configuration             (configuration details)
+        - examples                              (a few useful examples)
+
+--
+
+Title: example
+Title: examples
+Text:
+
+    This section will be filled in with useful examples, once it becomes
+    more clear what examples may be useful.
+
+    For the moment, please consult examples provided with each action.
+
+--



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