#!/usr/bin/perl -w
#
# (C)opyright Oracle/Innobase Oy. 2007.
#
# The purpose of this (simple) script is to create a configure command line
# that can be used to build the InnoDB dynamic plugin. It makes the assumption
# that the configure parameters are quoted like so '--with-innodb'. It uses
# this to split the string on "'".
#
# Usage: dynconfig <path/to/mysqlbug>
#
# RETURNS: 0 OK

use strict;
use warnings;

my $buffer;

# These are the engines whose config parameters we need to remove.
my @engines = (
	"ndbcluster",
	"innodb",
	"csv",
	"archive",
	"blackhole",
	"example",
	"federated",
	"embedded-server",
	"partition"
);

# Map the following variables to something else. If you want to remove any
# parameters from the configure command line, simply add an "" value to the
# hashtable below.
my %mapped = (
	"--disable-shared"	=>	"",
	"--enable-static"	=>	"--enable-shared"
);

# Variables to use from the environment if defined
my @environment = (
	"CC",
	"CXX"
);

sub get_value {
	my ($line) = @_;

	$line =~ s/^CONFIGURE_LINE="(.*)"$/$1/;

	return($line);
}

sub is_with_engine {
	my ($param) = @_;

	foreach my $engine (@engines) {

		if ($param =~ /--with-$engine/) {
			return($engine);
		} elsif ($param =~ /--with-$engine-storage-engine/) {
			return($engine);
		}
	}

	return(undef);
}

sub map_param {
	my ($param) = @_;
	my ($name, $value) = split(/=/, $param);
	my $mapped;

	if (!defined($value)) {
		$mapped = $mapped{$param};
	} else {
		$mapped = $mapped{$name};
	}

	return(defined($mapped) ? $mapped: $param);
}

# Remove leading whitespace
sub ltrim($) {
	my $string = shift;

	$string =~ s/^\s+//;

	return $string;
}

# Remove trailing whitespace
sub rtrim($) {
	my $string = shift;

	$string =~ s/\s+$//;

	return $string;
}

# Remove leading and trailing whitespace
sub squeeze($) {
	my $string = shift;

	return(rtrim(ltrim($string)));
}

if ($#ARGV != 0) {
	die "usage: $0 path/to/mysqlbug\n";
}

open(F, $ARGV[0]) ||
	die "Error opening $ARGV[0]: $!\n";
read(F, $buffer, 131072) ||
	die "Error reading file $ARGV[0]: $!\n";
close(F);

my @matched = grep(/^CONFIGURE_LINE=/, split(/\n/, $buffer));

# Check for no match
if ($#matched == -1 ) {
	die "CONFIGURE_LINE= not found in : $ARGV[0]\n";
# Check if more than one line matched
} elsif ($#matched > 0) {
	die "Error: $#matched matches for CONFIGURE_LINE= found.\n";
}

# Since CONFIGURE_LINE is an environment variable we extract the value,
# stripping the "" quotes around the value too.
my $configure = get_value($matched[0]);

# Insert the environment variables if found into the hash table
foreach my $var (@environment) {

	if (defined($ENV{$var})) {
		$mapped{$var} = "$var=" . $ENV{$var};
	}
}

# Set the value to "" for the parameters to be removed.
if (defined($ENV{"MYSQL_CONFIG_DEL"})) {
	my $value = $ENV{"MYSQL_CONFIG_DEL"};

	($value) =~ s/MYSQL_CONFIG_DEL="(.+)"$/$1/;

	foreach my $param (split(/,/, $value)) {
		$param = squeeze($param);

		if ($param =~ /^'(.+)'$/) {
			$param = $1;
		}
		$mapped{$param} = "";
	}
}

my @arr = split("'", $configure);

foreach my $param (@arr) {

	# Skip blank lines
	if ($param =~ /^\s+$/) {
		next;
	# We don't want to put quotes around the command
	} elsif ($param =~ /.\/configure/) {
		print "$param";
		next;
	# Filter out the --with-engine parameters
	} elsif (is_with_engine($param)) {
		next;
	}

	$param = map_param($param);

	if (length($param) > 0) {
		print " '$param'";
	}
}

if (defined($ENV{"MYSQL_CONFIG_ADD"})) {
	my $value = $ENV{"MYSQL_CONFIG_ADD"};

	$value =~ s/MYSQL_CONFIG_ADD="(.+)"$/$1/;

	foreach my $param (split(/,/, $value)) {
		$param = squeeze($param);
		if ($param =~ /^'(.+)'$/) {
			$param = $1;
		}
		print " '$param'";
	}
}

print "\n";

exit(0);