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|
package Stow::Util;
=head1 NAME
Stow::Util - general utilities
=head1 SYNOPSIS
use Stow::Util qw(debug set_debug_level error ...);
=head1 DESCRIPTION
Supporting utility routines for L<Stow>.
=cut
use strict;
use warnings;
use POSIX qw(getcwd);
use base qw(Exporter);
our @EXPORT_OK = qw(
error debug set_debug_level set_test_mode
join_paths parent canon_path restore_cwd
);
our $ProgramName = 'stow';
our $VERSION = '2.2.2';
#############################################################################
#
# General Utilities: nothing stow specific here.
#
#############################################################################
=head1 IMPORTABLE SUBROUTINES
=head2 error($format, @args)
Outputs an error message in a consistent form and then dies.
=cut
sub error {
my ($format, @args) = @_;
die "$ProgramName: ERROR: " . sprintf($format, @args) . "\n";
}
=head2 set_debug_level($level)
Sets verbosity level for C<debug()>.
=cut
our $debug_level = 0;
sub set_debug_level {
my ($level) = @_;
$debug_level = $level;
}
=head2 set_test_mode($on_or_off)
Sets testmode on or off.
=cut
our $test_mode = 0;
sub set_test_mode {
my ($on_or_off) = @_;
if ($on_or_off) {
$test_mode = 1;
}
else {
$test_mode = 0;
}
}
=head2 debug($level, $msg)
Logs to STDERR based on C<$debug_level> setting. C<$level> is the
minimum verbosity level required to output C<$msg>. All output is to
STDERR to preserve backward compatibility, except for in test mode,
when STDOUT is used instead. In test mode, the verbosity can be
overridden via the C<TEST_VERBOSE> environment variable.
Verbosity rules:
=over 4
=item 0: errors only
=item >= 1: print operations: LINK/UNLINK/MKDIR/RMDIR/MV
=item >= 2: print operation exceptions
e.g. "_this_ already points to _that_", skipping, deferring,
overriding, fixing invalid links
=item >= 3: print trace detail: trace: stow/unstow/package/contents/node
=item >= 4: debug helper routines
=item >= 5: debug ignore lists
=back
=cut
sub debug {
my ($level, $msg) = @_;
if ($debug_level >= $level) {
if ($test_mode) {
print "# $msg\n";
}
else {
warn "$msg\n";
}
}
}
#===== METHOD ===============================================================
# Name : join_paths()
# Purpose : concatenates given paths
# Parameters: path1, path2, ... => paths
# Returns : concatenation of given paths
# Throws : n/a
# Comments : factors out redundant path elements:
# : '//' => '/' and 'a/b/../c' => 'a/c'
#============================================================================
sub join_paths {
my @paths = @_;
# weed out empty components and concatenate
my $result = join '/', grep {! /\A\z/} @paths;
# factor out back references and remove redundant /'s)
my @result = ();
PART:
for my $part (split m{/+}, $result) {
next PART if $part eq '.';
if (@result && $part eq '..' && $result[-1] ne '..') {
pop @result;
}
else {
push @result, $part;
}
}
return join '/', @result;
}
#===== METHOD ===============================================================
# Name : parent
# Purpose : find the parent of the given path
# Parameters: @path => components of the path
# Returns : returns a path string
# Throws : n/a
# Comments : allows you to send multiple chunks of the path
# : (this feature is currently not used)
#============================================================================
sub parent {
my @path = @_;
my $path = join '/', @_;
my @elts = split m{/+}, $path;
pop @elts;
return join '/', @elts;
}
#===== METHOD ===============================================================
# Name : canon_path
# Purpose : find absolute canonical path of given path
# Parameters: $path
# Returns : absolute canonical path
# Throws : n/a
# Comments : is this significantly different from File::Spec->rel2abs?
#============================================================================
sub canon_path {
my ($path) = @_;
my $cwd = getcwd();
chdir($path) or error("canon_path: cannot chdir to $path from $cwd");
my $canon_path = getcwd();
restore_cwd($cwd);
return $canon_path;
}
sub restore_cwd {
my ($prev) = @_;
chdir($prev) or error("Your current directory $prev seems to have vanished");
}
=head1 BUGS
=head1 SEE ALSO
=cut
1;
# Local variables:
# mode: perl
# cperl-indent-level: 4
# end:
# vim: ft=perl
|
