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#!/usr/bin/env perl
# tap3 [DESC] - check output/error/status of a command against a specification
#
# A tiny variant of shelltestrunner (format v1), just takes one test
# case and outputs a TAP line.
#
# Input format:
#
# CMD
# <<<
# INPUT
# >>>
# OUTPUT
# >>> /OUTPUT REGEX/
# >>>2
# STDERR
# >>>2 /STDERR REGEX/
# >>>= STATUS
# >>>= !STATUS
#
# All but CMD are optional and can be put in any order,
# Regex variants can be repeated, all patterns must match.
# By default, STATUS is set to 0 and STDERR assumed empty.
#
# To the extent possible under law, the creator of this work has waived
# all copyright and related or neighboring rights to this work.
# http://creativecommons.org/publicdomain/zero/1.0/

use strict;
use warnings;
use Symbol 'gensym';
use IPC::Open3;

my $cmd = "";
my ($input, $output, @output_rx, $stderr, @stderr_rx, $status, $status_not);
my $ignored = "";

my $var = \$cmd;
while (<STDIN>) {
	if (/^#!? /) { next; }
	if (/^<<<$/) { $var = \$input; $input = ""; next; }
	if (/^>>>$/) { $var = \$output; $output = ""; next; }
	if (/^>>>2$/) { $var = \$stderr; $stderr = ""; next; }
	if (/^>>>\s*\/(.*)\/$/) { push @output_rx, $1; next; }
	if (/^>>>2\s*\/(.*)\/$/) { push @stderr_rx, $1; next; }
	if (/^>>>=\s+(\d+)$/) { $var = \$ignored; $status = $1; next; }
	if (/^>>>=\s+!(\d+)$/) { $var = \$ignored; $status_not = $1; next; }
	$$var .= $_;
}

chomp($cmd);
die "No command to check given\n"  if !$cmd;

my ($wtr, $rdr);
my $err = gensym;
my $pid = open3($wtr, $rdr, $err, "/bin/sh", "-c", $cmd);

my $desc = shift || $cmd;
$desc =~ s/\n.*//;

print $wtr $input  if (defined($input));
close $wtr;
my $real_output = do { local $/; <$rdr>; };
my $real_stderr = do { local $/; <$err>; };
waitpid($pid, 0);
my $real_status = $? >> 8;

my $r = 0;

sub not_ok {
	print "not ok - $desc\n"  if (!$r);
	$r = 1;
	$_[0] =~ s/^/# /mg;
	print $_[0];
}

if (defined($output) && $real_output ne $output) {
	not_ok("wrong output:\n$real_output");
}
for my $rx (@output_rx) {
	if ($real_output !~ $rx) {
		not_ok("output doesn't match /$rx/:\n$real_output\n");
	}
}
if (defined($stderr) && $real_stderr ne $stderr) {
	not_ok("wrong stderr:\n$real_stderr");
}
for my $rx (@stderr_rx) {
	if ($real_stderr !~ $rx) {
		not_ok("stderr doesn't match /$rx/:\n$real_stderr\n");
	}
}
if (!defined($stderr) && !@stderr_rx &&
    !defined($status) && !defined($status_not) &&
    $real_stderr) {
	not_ok("output to stderr:\n$real_stderr\n");
}
if (defined($status) && $real_status != $status) {
	not_ok("wrong status: $real_status (expected $status)\n");
}
if (defined($status_not) && $real_status == $status_not) {
	not_ok("wrong status: $real_status (expected anything else)\n");
}
if (!defined($status) && !defined($status_not) &&
    !defined($stderr) && !@stderr_rx &&
    $real_status != 0) {
	not_ok("wrong status: $real_status (command failed)\n");
}

print "ok - $desc\n"  if (!$r);

exit $r;