# -*-Perl-*-

# the best beginning module example.  Very simple, uses the standard hooks.

# instances allowed: one 

# (single instance modules would be silly to use more than one of
# anyway, so we use package local storage.  This is faster and places
# less artificial load on the machine than doing everything through
# the object hash)

package MGMmodule::loadav;
use vars qw($xpath $widget $graph);

sub module_init{
    my$this=shift;
    my$toplevel=$this->{"toplevel"};
    my$xclass=$this->{"xclass"};
    
    unless (open(PROC,"</proc/loadavg")){
	$toplevel->optionAdd("$xclass*active",'false',21);
    }
    $toplevel->optionAdd("$xclass.order", 2,21);
    $this;
}

sub module_instance{
    my$this=shift;
    my$toplevel=$this->{"toplevel"};
    return undef if(defined($xpath));
    $xpath=$this->{"xpath"};
    # modify defaults
    $toplevel->optionAdd("$xpath*scalerefresh",2000,21); # 2s
    $toplevel->optionAdd("$xpath.bar.0.label", "Load average",21);
    $toplevel->optionAdd("$xpath.bar.1.label", "Load (5min)",21);
    $toplevel->optionAdd("$xpath.bar.2.label", "Load (15min)",21);
    $toplevel->optionAdd("$xpath.scalewidadj", 220,21);  # narrower
    $toplevel->optionAdd("$xpath.scalelenadj", 60,21);   # shorter
    
    my($minx,$miny)=&MGM::Graph::calcxysize($this,1024*1024*512,' proc(s)',3);
    
    $toplevel->optionAdd("$xpath.minx",        $minx,21);      
    $toplevel->optionAdd("$xpath.miny",        $miny,21);          
    $this;
}

sub module_run{
    my$this=shift;
    
    $graph=MGM::Graph->new($this,num=>3,prompt=>' proc(s)');
    $widget=$graph->{"widget"};        # must return the widget
}

sub module_update{ 
    my$this=shift;
    if(open(PROC,"</proc/loadavg")){
	sysread PROC, $_, 1024;
	if(m/^([0123456789\.]+)\s*([0123456789\.]+)\s*([0123456789\.]+)/){
	    $graph->set($1,$2,$3);
	}
	close PROC;
    }
}

sub destroy{
    undef $xpath;
}

bless {};