use strict;
my %command_list;
my @cl;
my $command;

%command_list = (
       #quit => \&end_program,
       greeting => \&greeting,
       #time => \&systime,
       #help => \&help,                        
       log => \&which_log   # this one is new
);

while (1){
   $command = <STDIN>; # assume $command="log start"
   @cl = split / /,$command;
   my $func = shift @cl;   # first CLI argument is hash key
   
   if (!(defined($cl[0]))){  # had to add this to handle single word commands
      chop($func);
      }
         
   if (defined($command_list{$func})) {
     $command_list{$func}->(@cl);   # passes rest of CLI args to handler
   } else {
     print "invalid command\n";
   }
}

sub greeting {
   print "welcome\n"
}

sub start_logs() {
   print "Logs Started\n";
}


sub stop_logs() {
   print "Logs Stopped\n";
}

sub log_status {
   print "log status\n"
}


sub which_log {
   my $arg = shift;
   chop($arg); # newline here also...
   return start_logs() if ($arg eq "start");
   return stop_logs() if ($arg eq "stop");
   return log_status(); # default behavior
}