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# This program is copyright 2010-2012 Percona Inc.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA.
# ###########################################################################
# ReadKeyMini package
# ###########################################################################
# Package: ReadKeyMini
# ReadKeyMini is a wrapper around Term::ReadKey. If that's available,
# we use ReadMode and GetTerminalSize from there. Otherwise, we use homebrewn
# definitions.
BEGIN {
package ReadKeyMini;
# Here be magic. We lie to %INC and say that someone already pulled us from
# the filesystem. Which might be true, if this is inside a .pm file, but
# might not be, if we are part of the big file. The spurious BEGINs are mostly
# unnecesary, but if we aren't inside a .pm and something uses us, import or
# EXPORT_OK might not yet be defined. Though that probably won't help.
# Costs us nothing though, so worth trying. Putting this on top of the file
# would solve the issue.
BEGIN { $INC{"ReadKeyMini.pm"} ||= 1 }
use warnings;
use strict;
use English qw(-no_match_vars);
use constant PTDEBUG => $ENV{PTDEBUG} || 0;
use POSIX qw( :termios_h );
use Fcntl qw( F_SETFL F_GETFL );
use base qw( Exporter );
BEGIN {
# Fake Term::ReadKey. We clobber our own glob,
# ReadKeyMini::Function, and the Term::ReadKey glob, so callers can
# both import it if requested, or even use the fully-qualified name
# without issues.
our @EXPORT_OK = qw( GetTerminalSize ReadMode );
*ReadMode = *Term::ReadKey::ReadMode = \&_ReadMode;
*GetTerminalSize = *Term::ReadKey::GetTerminalSize = \&_GetTerminalSize;
}
my %modes = (
original => 0,
restore => 0,
normal => 1,
noecho => 2,
cbreak => 3,
raw => 4,
'ultra-raw' => 5,
);
# This primarily comes from the Perl Cookbook, recipe 15.8
{
my $fd_stdin = fileno(STDIN);
my $flags;
unless ( $PerconaTest::DONT_RESTORE_STDIN ) {
$flags = fcntl(STDIN, F_GETFL, 0)
or warn "Error getting STDIN flags with fcntl: $OS_ERROR";
}
my $term = POSIX::Termios->new();
$term->getattr($fd_stdin);
my $oterm = $term->getlflag();
my $echo = ECHO | ECHOK | ICANON;
my $noecho = $oterm & ~$echo;
sub _ReadMode {
my $mode = $modes{ $_[0] };
if ( $mode == $modes{normal} ) {
cooked();
}
elsif ( $mode == $modes{cbreak} || $mode == $modes{noecho} ) {
cbreak( $mode == $modes{noecho} ? $noecho : $oterm );
}
else {
die("ReadMore('$_[0]') not supported");
}
}
sub cbreak {
my ($lflag) = $_[0] || $noecho;
$term->setlflag($lflag);
$term->setcc( VTIME, 1 );
$term->setattr( $fd_stdin, TCSANOW );
}
sub cooked {
$term->setlflag($oterm);
$term->setcc( VTIME, 0 );
$term->setattr( $fd_stdin, TCSANOW );
if ( !$PerconaTest::DONT_RESTORE_STDIN ) {
fcntl(STDIN, F_SETFL, int($flags))
or warn "Error restoring STDIN flags with fcntl: $OS_ERROR";
}
}
END { cooked() }
}
sub readkey {
my $key = '';
cbreak();
sysread(STDIN, $key, 1);
my $timeout = 0.1;
if ( $key eq "\033" ) {
# Ugly and broken hack, but good enough for the two minutes it took
# to write. Namely, Ctrl escapes, the F-NUM keys, and other stuff
# you can send from the keyboard take more than one "character" to
# represent, and would be wrong to break into pieces.
my $x = '';
STDIN->blocking(0);
sysread(STDIN, $x, 2);
STDIN->blocking(1);
$key .= $x;
redo if $key =~ /\[[0-2](?:[0-9];)?$/
}
cooked();
return $key;
}
# As per perlfaq8:
BEGIN {
eval { no warnings; local $^W; require 'sys/ioctl.ph' };
if ( !defined &TIOCGWINSZ ) {
*TIOCGWINSZ = sub () {
# Very few systems actually have ioctl.ph, thus it comes to this.
# These seem to be good enough, for now. See:
# http://stackoverflow.com/a/4286840/536499
$^O eq 'linux' ? 0x005413
: $^O eq 'solaris' ? 0x005468
: 0x40087468;
};
}
}
sub _GetTerminalSize {
if ( @_ ) {
die "My::Term::ReadKey doesn't implement GetTerminalSize with arguments";
}
my $cols = $ENV{COLUMNS} || 80;
my $rows = $ENV{LINES} || 24;
if ( open( TTY, "+<", "/dev/tty" ) ) { # Got a tty
my $winsize = '';
if ( ioctl( TTY, &TIOCGWINSZ, $winsize ) ) {
( $rows, $cols, my ( $xpixel, $ypixel ) ) = unpack( 'S4', $winsize );
return ( $cols, $rows, $xpixel, $ypixel );
}
}
if ( $rows = `tput lines 2>/dev/null` ) {
chomp($rows);
chomp($cols = `tput cols`);
}
elsif ( my $stty = `stty -a 2>/dev/null` ) {
($rows, $cols) = $stty =~ /([0-9]+) rows; ([0-9]+) columns;/;
}
else {
($cols, $rows) = @ENV{qw( COLUMNS LINES )};
$cols ||= 80;
$rows ||= 24;
}
return ( $cols, $rows );
}
}
1;
# ###########################################################################
# End ReadKeyMini package
# ###########################################################################
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