eval 'exec perl -S $0 ${1+"$@"}'  # -*- Mode: perl -*-
    if $running_under_some_shell; # convertRelease.pl
#*************************************************************************
# Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
#     National Laboratory.
# Copyright (c) 2002 The Regents of the University of California, as
#     Operator of Los Alamos National Laboratory.
# EPICS BASE is distributed subject to a Software License Agreement found
# in file LICENSE that is included with this distribution. 
#*************************************************************************
#
# $Id$
#
# Convert configure/RELEASE file(s) into something else.
#

use strict;
use lib '@TOP@/lib/perl';

use Cwd qw(cwd abs_path);
use Getopt::Std;
use EPICS::Path;
use EPICS::Release;

use vars qw($arch $top $iocroot $root);

our ($opt_a, $opt_t, $opt_T);

$Getopt::Std::OUTPUT_HELP_VERSION = 1;
getopts('a:t:T:') or &HELP_MESSAGE;

my $cwd = UnixPath(cwd());

if ($opt_a) {
    $arch = $opt_a;
} else {		# Look for O.<arch> in current path
    $cwd =~ m{ / O. ([\w-]+) $}x;
    $arch = $1;
}

if ($opt_T) {
    $top = $opt_T;
} else {		# Find $top from current path
    # This approach only works inside iocBoot/* and configure/*
    $top = $cwd;
    $top =~ s{ / iocBoot .* $}{}x;
    $top =~ s{ / configure .* $}{}x;
}

# The IOC may need a different path to get to $top
if ($opt_t) {
    $iocroot = $opt_t;
    $root = $top;
    while (substr($iocroot, -1, 1) eq substr($root, -1, 1)) {
	chop $iocroot;
	chop $root;
    }
}

&HELP_MESSAGE unless @ARGV == 1;

my $outfile = $ARGV[0];

# TOP refers to this application
my %macros = (TOP => LocalPath($top));
my @apps   = ('TOP');	# Records the order of definitions in RELEASE file

# Read the RELEASE file(s)
my $relfile = "$top/configure/RELEASE";
die "Can't find $relfile" unless (-f $relfile);
readReleaseFiles($relfile, \%macros, \@apps, $arch);
expandRelease(\%macros, \@apps);


# This is a perl switch statement:
for ($outfile) {
    m/releaseTops/	 and do { &releaseTops;		last; };
    m/cdCommands/	 and do { &cdCommands;		last; };
    m/envPaths/  	 and do { &envPaths;		last; };
    m/checkRelease/	 and do { &checkRelease;	last; };
    die "Output file type \'$outfile\' not supported";
}


############### Subroutines only below here ###############

sub HELP_MESSAGE {
    print STDERR <<EOF;
Usage: convertRelease.pl [-a arch] [-T top] [-t ioctop] outfile
    where outfile is one of:
        releaseTops - lists the module names defined in RELEASE*s
        cdCommands - generate cd path strings for vxWorks IOCs
        envPaths - generate epicsEnvSet commands for other IOCs
        checkRelease - checks consistency with support modules
EOF
    exit 2;
}

#
# List the module names defined in RELEASE* files
#
sub releaseTops {
    my @includes = grep !/^(TOP|TEMPLATE_TOP)$/, @apps;
    foreach my $app (@includes) {
	print "$app ";
    }
    print "\n";
}

sub cdCommands {
    die "Architecture not set (use -a option)" unless ($arch);
    my @includes = grep !/^TEMPLATE_TOP$/, @apps;
    
    unlink($outfile);
    open(OUT,">$outfile") or die "$! creating $outfile";
    
    my $startup = $cwd;
    $startup =~ s/^$root/$iocroot/o if ($opt_t);
    
    print OUT "startup = \"$startup\"\n";
    
    my $ioc = $cwd;
    $ioc =~ s/^.*\///;	# iocname is last component of directory name
    
    print OUT "putenv \"ARCH=$arch\"\n";
    print OUT "putenv \"IOC=$ioc\"\n";
    
    foreach my $app (@includes) {
	my $iocpath = my $path = $macros{$app};
	$iocpath =~ s/^$root/$iocroot/o if ($opt_t);
	my $app_lc = lc($app);
	print OUT "$app_lc = \"$iocpath\"\n" if (-d $path);
	print OUT "putenv \"$app=$iocpath\"\n" if (-d $path);
	print OUT "${app_lc}bin = \"$iocpath/bin/$arch\"\n" if (-d "$path/bin/$arch");
    }
    close OUT;
}

sub envPaths {
    die "Architecture not set (use -a option)" unless ($arch);
    my @includes = grep !/^TEMPLATE_TOP$/, @apps;
    
    unlink($outfile);
    open(OUT,">$outfile") or die "$! creating $outfile";
    
    my $ioc = $cwd;
    $ioc =~ s/^.*\///;	# iocname is last component of directory name
    
    print OUT "epicsEnvSet(ARCH,\"$arch\")\n";
    print OUT "epicsEnvSet(IOC,\"$ioc\")\n";
    
    foreach my $app (@includes) {
	my $iocpath = my $path = $macros{$app};
	$iocpath =~ s/^$root/$iocroot/o if ($opt_t);
	print OUT "epicsEnvSet($app,\"$iocpath\")\n" if (-d $path);
    }
    close OUT;
}

sub checkRelease {
    my $status = 0;
    delete $macros{TOP};
    delete $macros{TEMPLATE_TOP};
    
    while (my ($app, $path) = each %macros) {
	my %check = (TOP => $path);
	my @order = ();
	my $relfile = "$path/configure/RELEASE";
	readReleaseFiles($relfile, \%check, \@order, $arch);
	expandRelease(\%check, \@order);
	delete $check{TOP};
	
	while (my ($parent, $ppath) = each %check) {
	    if (exists $macros{$parent} &&
		abs_path($macros{$parent}) ne abs_path($ppath)) {
		print "\n" unless ($status);
		print "Definition of $parent conflicts with $app support.\n";
		print "In this application configure/RELEASE defines\n";
		print "\t$parent = $macros{$parent}\n";
		print "but $app at $path has\n";
		print "\t$parent = $ppath\n";
		$status = 1;
	    }
	}
    }
    print "\n" if ($status);
    exit $status;
}