Sweden-Number/tools/winapi/output.pm

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#
# Copyright 1999, 2000, 2001 Patrik Stridvall
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#
package output;
use strict;
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK);
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw();
@EXPORT_OK = qw($output);
use vars qw($output);
$output = '_output'->new;
package _output;
use strict;
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my $stdout_isatty = -t STDOUT;
my $stderr_isatty = -t STDERR;
sub new($) {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {};
bless ($self, $class);
my $progress_enabled = \${$self->{PROGRESS_ENABLED}};
my $progress = \${$self->{PROGRESS}};
my $last_progress = \${$self->{LAST_PROGRESS}};
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my $last_time = \${$self->{LAST_TIME}};
my $progress_count = \${$self->{PROGRESS_COUNT}};
my $prefix = \${$self->{PREFIX}};
my $prefix_callback = \${$self->{PREFIX_CALLBACK}};
$$progress_enabled = 1;
$$progress = "";
$$last_progress = "";
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$$last_time = 0;
$$progress_count = 0;
$$prefix = undef;
$$prefix_callback = undef;
return $self;
}
sub DESTROY {
my $self = shift;
$self->hide_progress;
}
sub enable_progress($) {
my $self = shift;
my $progress_enabled = \${$self->{PROGRESS_ENABLED}};
$$progress_enabled = 1;
}
sub disable_progress($) {
my $self = shift;
my $progress_enabled = \${$self->{PROGRESS_ENABLED}};
$$progress_enabled = 0;
}
sub show_progress($) {
my $self = shift;
my $progress_enabled = \${$self->{PROGRESS_ENABLED}};
my $progress = ${$self->{PROGRESS}};
my $last_progress = \${$self->{LAST_PROGRESS}};
my $progress_count = \${$self->{PROGRESS_COUNT}};
$$progress_count++;
if($$progress_enabled) {
if($$progress_count > 0 && $$progress && $stderr_isatty) {
# If progress has more than $columns characters the xterm will
# scroll to the next line and our ^H characters will fail to
# erase it.
my $columns=$ENV{COLUMNS} || 80;
$progress = substr $progress,0,($columns-1);
print STDERR $progress;
$$last_progress = $progress;
}
}
}
sub hide_progress($) {
my $self = shift;
my $progress_enabled = \${$self->{PROGRESS_ENABLED}};
my $progress = \${$self->{PROGRESS}};
my $last_progress = \${$self->{LAST_PROGRESS}};
my $progress_count = \${$self->{PROGRESS_COUNT}};
$$progress_count--;
if($$progress_enabled) {
if($$last_progress && $stderr_isatty) {
my $message=" " x length($$last_progress);
print STDERR $message;
undef $$last_progress;
}
}
}
sub update_progress($) {
my $self = shift;
my $progress_enabled = \${$self->{PROGRESS_ENABLED}};
my $progress = ${$self->{PROGRESS}};
my $last_progress = \${$self->{LAST_PROGRESS}};
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if($$progress_enabled) {
# If progress has more than $columns characters the xterm will
# scroll to the next line and our ^H characters will fail to
# erase it.
my $columns=$ENV{COLUMNS} || 80;
$progress = substr $progress,0,($columns-1);
my $prefix = "";
my $suffix = "";
if($$last_progress) {
$prefix = "" x length($$last_progress);
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my $diff = length($$last_progress)-length($progress);
if($diff > 0) {
$suffix = (" " x $diff) . ("" x $diff);
}
}
print STDERR $prefix, $progress, $suffix;
$$last_progress = $progress;
}
}
sub progress($$) {
my $self = shift;
my $progress = \${$self->{PROGRESS}};
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my $last_time = \${$self->{LAST_TIME}};
my $new_progress = shift;
if(defined($new_progress)) {
if(!defined($$progress) || $new_progress ne $$progress) {
$$progress = $new_progress;
$self->update_progress;
$$last_time = 0;
}
} else {
return $$progress;
}
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}
sub lazy_progress($$) {
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my $self = shift;
my $progress = \${$self->{PROGRESS}};
my $last_time = \${$self->{LAST_TIME}};
$$progress = shift;
my $time = time();
if($time - $$last_time > 0) {
$self->update_progress;
$$last_time = $time;
}
}
sub prefix($$) {
my $self = shift;
my $prefix = \${$self->{PREFIX}};
my $prefix_callback = \${$self->{PREFIX_CALLBACK}};
my $new_prefix = shift;
if(defined($new_prefix)) {
if(!defined($$prefix) || $new_prefix ne $$prefix) {
$$prefix = $new_prefix;
$$prefix_callback = undef;
}
} else {
return $$prefix;
}
}
sub prefix_callback($) {
my $self = shift;
my $prefix = \${$self->{PREFIX}};
my $prefix_callback = \${$self->{PREFIX_CALLBACK}};
$$prefix = undef;
$$prefix_callback = shift;
}
sub write($$) {
my $self = shift;
my $message = shift;
my $prefix = \${$self->{PREFIX}};
my $prefix_callback = \${$self->{PREFIX_CALLBACK}};
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$self->hide_progress if $stdout_isatty;
if(defined($$prefix)) {
print $$prefix . $message;
} elsif(defined($$prefix_callback)) {
print &{$$prefix_callback}() . $message;
} else {
print $message;
}
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$self->show_progress if $stdout_isatty;
}
1;