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#!/bin/sh

: ${PERL=perl}

$PERL -e 1 > /dev/null 2>&1 || {
  echo 1>&2 "$0: configure didn't find a usable version of Perl," \
    "so can't run this test"
  exit 77
}

ARGV_0=$0
export ARGV_0

exec $PERL -w -- - <<\EOF

# Ensure that cat exits upon a single EOF (^D) from a tty.
# Do the same for all programs that can read stdin,
# require no arguments and that write to standard output.
use strict;

(my $ME = $ENV{ARGV_0}) =~ s|.*/||;

# Some older versions of Expect.pm (e.g. 1.07) lack the log_user method,
# so check for that, too.
eval { require Expect; Expect->require_version('1.11') };
$@ and (warn "$ME: this script requires Perl's Expect package >=1.11\n"),
  exit 77;

{
  my $fail = 0;
  my @stdin_reading_commands = qw(
    base64
    cat
    cksum
    dd
    expand
    fmt
    fold
    head
    md5sum
    nl
    od
    paste
    pr
    ptx
    sha1sum
    sha224sum
    sha256sum
    sha384sum
    sha512sum
    sort
    sum
    tac
    tail
    tee
    tsort
    unexpand
    uniq
    wc
  );
  foreach my $cmd ((@stdin_reading_commands), 'cut -f2')
    {
      my $exp = new Expect;
      $exp->log_user(0);
      $exp->spawn($cmd)
	or (warn "$ME: cannot run `$cmd': $!\n"), $fail=1, next;
      # No input for cut -f2.
      $cmd =~ /^cut/
	or $exp->send("a b\n");
      $exp->send("\cD");  # This is Control-D.  FIXME: what if that's not EOF?
      $exp->expect (0, '-re', "^a b\\r?\$");
      my $found = $exp->expect (1, '-re', "^.+\$");
      # $found and warn "F: $found: " . $exp->exp_match () . "\n";
      $exp->expect(1, 'eof');
      # Expect no output from cut, since we gave it no input.
      defined $found || $cmd =~ /^cut/
	or (warn "$ME: $cmd didn't produce expected output\n"),
	  $fail=1, next;
      defined defined $exp->exitstatus
	or (warn "$ME: $cmd didn't exit after ^D from standard input\n"),
	  $fail=1, next;
      my $s = $exp->exitstatus;
      $s == 0
	or (warn "$ME: $cmd exited with status $s (expected 0)\n"),
	  $fail=1;
      $exp->hard_close();
    }

  exit $fail
}
EOF