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package Version;
# ************************************************************
# Description : Central location for the MPC version.
# Author : Chad Elliott
# Create Date : 1/5/2003
# ************************************************************
# ************************************************************
# Pragmas
# ************************************************************
use strict;
use File::Spec;
# ************************************************************
# Data Section
# ************************************************************
## This is the starting major and minor version
my $version = '5.1';
my $once = 1;
my $cache = 'modules/.version';
# ************************************************************
# Subroutine Section
# ************************************************************
sub get {
if ($once) {
## We only need to do this once
$once = 0;
## Attempt to dynamically determine the revision part of the version
## string every time the version number is requested. This only happens
## if the --version option is used, an invalid option is used, and when
## the process starts up and the version hasn't been cached yet.
my $rev = '?';
my $cwd = Cwd::getcwd();
if (chdir(::getBasePath())) {
## Get the git revision for the final part of the version string.
my $nul = File::Spec->devnull();
my $r = _readVersion("git rev-parse --short HEAD 2> $nul |");
if (defined $r) {
## Store the version for later use, in the event that the git
## revision isn't available in the future.
if (open(CLH, ">$cache")) {
print CLH "$r\n";
close(CLH);
}
}
else {
## See if we can load in the previously stored version string.
$r = _readVersion($cache);
}
## Set the revision string if we were able to read one.
$rev = $r if (defined $r);
chdir($cwd);
}
## We then append the revision to the version string.
$version .= ".$rev";
}
return $version;
}
sub cache {
## Attempt to cache the revision if the cache file does not exist.
## This will allow the revision to be obtained in the event that git
## cannot return the revision information at a later time.
get() if (!-e ::getBasePath() . '/' . $cache);
}
1;
sub _readVersion {
my $file = shift;
my $rev;
if (open(CLH, $file)) {
while(<CLH>) {
if (/^(\w+)$/) {
$rev = $1;
last;
}
}
close(CLH);
}
return $rev;
}
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