Serge: display version information with the --version flag

Fixes serge-community#38.

CHANGES

@@ -60,6 +60,8 @@ Revision history
         - When job fails, we now move on to the next job in the config
           (previously the entire config would be skipped)
 
+        - Added version information to the CLI via the `--version` flag (#38)
+
 1.1     April 20, 2016
 
         - On OS X, expand `~` to the actual `$HOME` path in SQLite DB connection string (#1)

lib/Serge/Application.pm

@@ -8,6 +8,7 @@ use File::Find qw(find);
 use File::Spec::Functions qw(rel2abs catfile);
 use Getopt::Long qw(:config no_auto_abbrev no_ignore_case pass_through);
 use Serge::Config::Collector;
+use Serge;
 
 sub new {
     my ($class) = @_;
@@ -24,12 +25,19 @@ sub new {
 sub run {
     my ($self) = @_;
 
-    my ($help, $debug);
+    my ($help, $debug, $version);
     my $result = GetOptions(
         'help' => \$help,
         'debug' => \$debug,
+        'version|V' => \$version,
     );
 
+    # print out version when passing the flat to a bare `serge` command
+    if ($version && !@ARGV[0]) {
+        print "Serge $Serge::VERSION\n";
+        exit(0);
+    }
+
     if (!$result) {
         $self->error("Failed to parse some command-line parameters.");
     }
@@ -172,4 +180,4 @@ sub error {
     exit($exitstatus);
 }
 
-1;
+1;