#!/usr/bin/perl -w
#
# Copyright (C) 2006 Rodolphe Quiedeville <rodolphe@quiedeville.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# If you improve this script please send your version to my email address
# with the copyright notice upgrade with your name.
#
# Wildcard-plugin to monitor the ccache stats. To monitor an
# user cache, link ccache_<user> to this file. E.g.
#
#    ln -s /usr/share/munin/plugins/ccache_ /etc/munin/plugins/ccache_loic
#
# ...will monitor loic ccache stats.
#
# $Log$
# Revision 1.1  2006/04/27 14:12:19  rodo
# More stats
#
# Revision 1.0  2006/04/27 14:12:19  rodo
# Created by Rodolphe Quiedeville
#
# Configurable variables
#
# 	ccache          - Override default ccache command
# 	ccache_dir      - Override default cache dir
#
# Magic markers (optinal - used by munin-config and some installation
# scripts):
#
#%# family=compilation
#%# capabilities=autoconf

use strict;

$0 =~ /ccache_(.+)*$/;
my $user = $1;
exit 2 unless defined $user;

$ENV{CCACHE_DIR} = exists $ENV{'ccache_dir'} ? $ENV{'ccache_dir'} : "/home/$user/.ccache";

my $CCACHE = exists $ENV{'ccache'} ? $ENV{'ccache'} : "/usr/bin/ccache";


(-d $ENV{CCACHE_DIR}) || die "Can't open $ENV{CCACHE_DIR}\n";
(-x $CCACHE) || die "Can't exec $CCACHE\n";

# cache directory                     /home/rodo/.ccache
# cache hit                              9
# cache miss                             6
# called for link                       11
# multiple source files                 20
# compiler produced stdout               2
# compile failed                         3
# ccache internal error                  5
# preprocessor error                     6
# couldn't find the compiler             7
# cache file missing                     8
# bad compiler arguments                10
# not a C/C++ file                      50
# autoconf compile/link                 30
# unsupported compiler option           20
# output to stdout                      30
# output to a non-regular file          20
# no input file                         25
# files in cache                        45
# cache size                            20 Kbytes
# max files                             30
# max cache size                      1024 Kbytes

my %WANTED = ( "cache hit"       => "hit",
	       "cache miss"      => "miss",
	       "called for link" => "link",
	       "multiple source files" => "multiple",
	       "compiler produced stdout" => "prodoutput",
	       "compile failed"  => "failed",
	       "ccache internal error" => "error",
	       "preprocessor error" => "preperror",
	       "couldn't find the compiler" => "compiler",
	       "cache file missing" => "missing",
	       "bad compiler arguments" => "badarg",
	       "not a C/C++ file" => "noc",
	       "autoconf compile/link" => "autoconf",
	       "unsupported compiler option" => "unsup",
	       "output to stdout" => "stdout",
	       "output to a non-regular file" => "ononregf",
	       "no input file"   => "noinput",
	       );

my $cache = "$CCACHE -s";

if ($ARGV[0] and $ARGV[0] eq "config" ){
    print "graph_title ccache utilisation for $user\n";
    print "graph_args --base 1000 -l 0\n";
    print "graph_scale yes\n";
    print "graph_vlabel files\n";
    print "graph_category compilation\n";
    print 'graph_info Plugin available at <a href="http://rodolphe.quiedeville.org/hack/munin/">http://rodolphe.quiedeville.org/hack/munin/</a>'."\n";

    open(CCH, "$cache|") or exit 4;
    my ($num) = (0);
    while (<CCH>)
    {
	my ($k, $v) = (/(.*)\s+(\d+)$/);
	next unless ($k);
	$k =~ s/\s+$//;

	if (exists $WANTED{$k} ) {
	    print("$WANTED{$k}.label $k\n");
	    print("$WANTED{$k}.type DERIVE\n");

	    ($num > 0) ? print("$WANTED{$k}.draw STACK\n") : print("$WANTED{$k}.draw AREA\n");

	    $num++;
	}	
    }
    close(CCH);
    exit 0;
}

open(CCH, "$cache|") or exit 4;
while (<CCH>)
{
    my ($k, $v) = (/(.*)\s+(\d+)$/);
    next unless ($k);
    $k =~ s/\s+$//;

    print("$WANTED{$k}.value $v\n") if (exists $WANTED{$k});
}
close(CCH);