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#!/usr/bin/perl
 
##############################################################################
#
#       generate_config_sh
#               Process that takes an automatically generated config.sh
#               file and allows the environment to overload the values
#               automatically discovered by Configure on our target platform.
#
#       Author  Redvers Davies <red@criticalintegration.com>
#
##############################################################################
 
my $config = shift;
 
my $sys = $ENV{SYS};
 
my $callbacks = {};
$callbacks->{'ar'} = [\&simple_process, ["AR", "arm-linux-ar"]];
$callbacks->{'archname'} = [\&simple_process, ["SYS", "armv4l-linux"]];
$callbacks->{'cc'} = [\&simple_process, ["CC", "arm-linux-gcc"]];
$callbacks->{'cccdlflags'} = [\&simple_process, ["CFLAGS", ""]];
$callbacks->{'ccdlflags'} = [\&simple_process, ["CFLAGS", ""]];
$callbacks->{'ccflags'} = [\&simple_process, ["CFLAGS", "-fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"]];
$callbacks->{'ccflags_uselargefiles'} = [\&simple_process, ["CFLAGS", "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"]];
$callbacks->{'ccname'} = [\&simple_process, ["CC", "arm-linux-gcc"]];
$callbacks->{'cpp'} = [\&simple_process, ["CCP", "arm-linux-cpp"]];
$callbacks->{'cppflags'} = [\&simple_process, ["CCPFLAGS", "-fno-strict-aliasing"]];
$callbacks->{'cpprun'} = [\&simple_process_append, ["CC", "arm-linux-gcc -E", "-E"]];
$callbacks->{'cppstdin'} = [\&simple_process_append, ["CC", "arm-linux-gcc -E", "-E"]];
$callbacks->{'full_ar'} = [\&backtick, ["AR", "which $ENV{AR}", "/usr/local/arm/2.95.3/bin/arm-linux-ar"]];
$callbacks->{'ld'} = [\&simple_process, ["LD", "arm-linux-ld"]];
$callbacks->{'ldflags'} = [\&simple_process, ["LDFLAGS", ""]];
$callbacks->{'ldflags_uselargefiles'} = [\&simple_process, ["LDFLAGS", ""]];
$callbacks->{'myarchname'} = [\&simple_process, ["SYS", "armv4l-linux"]];
$callbacks->{'archlib'} = [\&library_munge, ["SYS", "armv4l-linux"]];
$callbacks->{'archlibexp'} = [\&library_munge, ["SYS", "armv4l-linux"]];
$callbacks->{'installarchlib'} = [\&library_munge, ["SYS", "armv4l-linux"]];
$callbacks->{'installsitearch'} = [\&library_munge, ["SYS", "armv4l-linux"]];
$callbacks->{'sitearch'} = [\&library_munge, ["SYS", "armv4l-linux"]];
$callbacks->{'sitearchexp'} = [\&library_munge, ["SYS", "armv4l-linux"]];
 
if ($config eq "") {
        die("Please run me as generate_config_sh path/to/original/config.sh");
}
 
open(FILE, '<', $config) || die("Unable to open $config");
 
my $line_in;
while ($line_in = <FILE>) {
        if ($line_in =~ /^#/) {
                next;
        }
 
        if ($line_in !~ /./) {
                next;
        }
 
        $line_in =~ /^([^=]+)=(.*)/;
        my $key = $1;
        my $value = $2;
        if (ref($callbacks->{$key}) eq "ARRAY") {
                ($callbacks->{$key}[0])->($key,$value);
        } else {
                print($line_in);
        }
}
 
sub backtick {
        my $key = shift;
        my $value = shift;
        my $envvar = $callbacks->{$key}->[1][0];
 
        if ($ENV{$envvar}) {
                my $rawtext = `$callbacks->{$key}->[1][1]`;
                chomp($rawtext);
                print("$key=\'$rawtext\'\n");
        } else {
                print("$key=\'$callbacks->{$key}->[1][2]\'\n");
        }
}
         
 
sub simple_process {
        my $key = shift;
        my $envvar = $callbacks->{$key}->[1][0];
 
        if ($ENV{$envvar}) {
                print("$key=\"$ENV{$envvar}\"\n");
        } else {
                print("$key=\'$callbacks->{$key}->[1][1]\'\n");
        }
 
}
 
sub simple_process_append {
        my $key = shift;
        my $envvar = $callbacks->{$key}->[1][0];
 
        if ($ENV{$envvar}) {
                print("$key=\"$ENV{$envvar} $callbacks->{$key}->[1][2]\"\n");
        } else {
                print("$key=\'$callbacks->{$key}->[1][1]\'\n");
        }
 
}
 
sub library_munge {
        my $key = shift;
        my $value = shift;
        my $envvar = $callbacks->{$key}->[1][0];
 
        if ($ENV{$envvar}) {
                $value =~ s/$callbacks->{$key}->[1][1]/$ENV{$envvar}/g;
                print("$key=$value\n");
        } else {
                print("$key=$value\n");
        }
                 
}