#!/usr/bin/perl
#
# FreeSwitch fsxs
#
# (C) 2006 Stefan Knoblich <stkn@netdomination.org>

use strict;

#
# @FOO@ will be replaced by the freeswitch build process
#
my %vars = (
	CC => '@CC@',
	LD => '@LD@',
	MKDIR => '@MKINSTALLDIRS@',
	INSTALL => '@INSTALL@',
	LIBS => '@LIBS@',
	CFLAGS => '@CFLAGS@',
	INCLUDES => '@INCLUDES@',
	LDFLAGS => '@LDFLAGS@',
	SOLINK => '@SOLINK@',

	MODULES_DIR => '@MODULES_DIR@',
	LIB_DIR => '@LIB_DIR@',
	BIN_DIR => '@BIN_DIR@',
	INC_DIR => '@INC_DIR@',
	DB_DIR => '@DB_DIR@',
	CFG_DIR => '@CFG_DIR@',
	PREFIX => '@PREFIX@'
);

#
# Misc variables
#
my @files = ();

my $command;
my $target;

my $needs_target = 1;
my $debug = 0;

#
# functions 
#

sub do_exec {
	my $retval = system( "@_ >/dev/null" );
	if( $retval ) {
		exit $retval;
	}
}

sub fsxs_usage {
	print "FreeSwitch fsxs\n(C) 2006-2008 Stefan Knoblich <stkn\@netdomination.org>\n";
	print "\n";
	print "Usage:\n";
	print "\t$0 compile [options] <file1 ...>\n";
	print "\t$0 link    [options] <target> <file1 ...>\n";
	print "\t$0 build   [options] <target> <file1 ...>\n";
	print "\t$0 install [options] <file1 ...>\n\n";
	print "\t$0 show    <var1>...[varN]\n";
	print "\t$0         <--var1>...<--varN>\n\n";

	print "Command description:\n";
	print "\tcompile: Compile source file(s) into object file(s)\n";
	print "\tlink:    Create module from object file(s)\n";
	print "\tbuild:   Build module from source file(s) (compile + link)\n";
	print "\tinstall: Install module(s) into freeswitch module directory\n";
	print "\tshow:    Show defined variable(s)\n";
	print "\n";

	print "Options:\n";
	print "\t--add-cflags  Append custom cflags   [compile, build]\n";
	print "\t--set-cflags  Override cflags        [compile, build]\n";
	print "\n";
	print "\t--add-ldflags Append custom ldflags  [link, build]\n";
	print "\t--set-ldflags Override ldflags       [link, build]\n";
	print "\t--add-libs    Append additional libs [link, build]\n";
	print "\t--set-libs    Override libs          [link, build]\n";
	print "\n";
	print "\t--destdir     Installation prefix    [install]\n";
	print "\n";

	print "Variable names for \"fsxs show\" / \"fsxs --var\":\n";
	print "\tcflags ldflags libs solink includes cc ld mkdir install\n";
	print "\tprefix lib_dir modules_dir db_dir inc_dir cfg_dir bin_dir\n";
	print "\n";

	print "Examples:\n";
	print "\t$0 compile --add-cflags=\"-DFOO=1 -DBAR\" mod_test.c mod_test2.c\n\n";
	print "\t$0 link --add-ldflags=\"-ltest\" mod_test.so mod_test.o mod_test2.o\n\n";
	print "\t$0 build --add-cflags=\"-DFOO\" --add-ldflags=\"-ltest\" mod_test.so mod_test.c mod_test2.c\n\n";
	exit 1;
}

sub fsxs_compile {
	my $cc_cmd;

	$cc_cmd = "$vars{CC}";
	if( defined( $vars{INCLUDES} ) && $vars{INCLUDES} ) {
		$cc_cmd = $cc_cmd . " $vars{INCLUDES}"
	}
	$cc_cmd = $cc_cmd . " $vars{CFLAGS} -c -o";

	foreach( @_ ) {
		chomp( $_ );

		# replace file extension
		my $outfile = $_;
		$outfile =~ s/\.(cpp|cc|c)$/.o/;

		print "CC\t$_\n";
		if( $debug ) {
			print "$cc_cmd $outfile $_\n"
		}
		do_exec( "$cc_cmd $outfile $_" );
	}
}

sub fsxs_link {
	my $target = shift;
	my @objs = @_;
	my $ld_cmd;

	$ld_cmd = "$vars{LD}";
	$ld_cmd = $ld_cmd . " $vars{LDFLAGS} $vars{SOLINK} -o";

	print "LD\t$target\t[@objs]\n";
	if( $debug ) {
		print "$ld_cmd $target @objs $vars{LIBS}\n"
	}
	do_exec( "$ld_cmd $target @objs $vars{LIBS}" );
}

sub fsxs_install {
	my @files = @_;
	my $destination = $vars{DESTDIR} . $vars{MODULES_DIR};

	# check if destination exists, create if it doesn't
	if( ! -e $destination ) {
		if( $debug ) {
			print "$vars{MKDIR} $destination\n";
		}
		do_exec( "$vars{MKDIR} $destination" );
	}
	if( $debug ) {
		print "$vars{INSTALL} -m644 @files $destination\n";
	}
	do_exec( "$vars{INSTALL} -m644 @files $destination" );
}

sub fsxs_show {
	my @varlist = @_;

	if( $#varlist < 0 ) {
		# none requested, show all variables with names
		my $key;
		foreach $key ( keys %vars ) {
			print "$key: $vars{$key}\n";
		}
	}
	elsif( $#varlist > 0 ) {
		# more than one requested, show with name
		foreach( @varlist ) {
			if( defined $vars{$_} ) {
				print "$_: $vars{$_}\n";
			}
		}
	} else {
		# show only one variable, without name
		if( defined $vars{$varlist[0]} ) {
			print "$vars{$varlist[0]}\n";
		}
	}
}

sub fsxs_showq {
	my @varlist = @_;

	if( $#varlist >= 0 ) {
		foreach( @varlist ) {
			if( defined $vars{$_} ) {
				print "$vars{$_} ";
			}
		}
	}
}

#
# main part
#
if( $#ARGV < 0 ) {
	fsxs_usage;
}

if( @ARGV[0] =~ /^\--.+$/ ) {
	# 'show' shortcut for using fsxs in scripts
	$needs_target = 0;
	$command = "showq";
}
else {
	chomp( $command = shift @ARGV );

	if( $command =~ /^install|build|link|compile|show$/ ) {

		# add -lfreeswitch to the front of the library list
		# we don't want it to be in the show / showq output
		# but we still want to be able to override it with --set-libs
		if( $command ne "show" ) {
			$vars{LIBS} = "-lfreeswitch $vars{LIBS}";
		}

		if( $command =~ /^show|compile|install$/ ) {
			$needs_target = 0;
		}
	}
	else {
		print STDERR "Unknown command: $command\n";
		fsxs_usage;
	}
}

# parse environment variables
if( defined $ENV{DEBUG} && $ENV{DEBUG} ) {
	$debug = 1;
}

# parse arguments
foreach(@ARGV) {
	chomp( $_ );

	if( $command ne "show" && $command ne "showq" )
	{
		if( /^\--add-cflags=(.*)$/ ) {
			$vars{CFLAGS} = "$vars{CFLAGS} $1";
		}
		elsif( /^\--set-cflags=(.*)$/ ) {
			$vars{CFLAGS} = "$1";
		}
		elsif( /^\--add-ldflags=(.*)$/ ) {
			$vars{LDFLAGS} = "$vars{LDFLAGS} $1";
		}
		elsif( /^\--set-ldflags=(.*)$/ ) {
			$vars{LDFLAGS} = "$1";
		}
		elsif( /^\--add-libs=(.*)$/ ) {
			$vars{LIBS} = "$vars{LIBS} $1";
		}
		elsif( /^\--set-libs=(.*)$/ ) {
			$vars{LIBS} = "$1";
		}
		elsif( /^\--destdir=(.*)$/ ) {
			$vars{DESTDIR} = "$1";
		}
		elsif( /^\--debug$/ ) {
			$debug = 1;
		}
		elsif( /^(DESTDIR|CFLAGS|CC|LDFLAGS|LD|LIBS)=(.*)$/ ) {
			if( $debug ) {
				print "Overriding $1 (new value: $2)\n";
			}
			$vars{$1} = "$2";
		}
		elsif( /^([^\-]+.*)$/ ) {
			if( $needs_target ) {
				$target = "$1";
				$needs_target = 0;
			} else {
				push(@files, "$1");
			}
		}
	} else {
		# show command has different parameter handling
		if( /^\--(.*)$/ ) {
			push( @files, uc "$1" );
		}
		elsif( /^([^\-]+.*)$/ ) {
			push( @files, uc "$1" );
		}
	}
}

#
# execute commands
#
if( $command eq 'link' ) {
	fsxs_link( $target, @files );
}
elsif( $command eq 'compile' ) {
	fsxs_compile( @files );
}
elsif( $command eq 'build' ) {
	my @objs = ();

	fsxs_compile( @files );

	foreach( @files ) {
		chomp( $_ );
		$_ =~ s/\.(cpp|cc|c)$/.o/;
		push( @objs, "$_" );
	}

	fsxs_link( $target, @objs );
}
elsif( $command eq 'show' ) {
	fsxs_show( @files );
}
elsif( $command eq 'showq' ) {
	fsxs_showq( @files );
}
elsif( $command eq 'install' ) {
	fsxs_install( @files );
}
else {
	fsxs_usage;
}

exit 0;