setup

#!/usr/bin/env perl

use strict;
use warnings;
use utf8;

sub imlib2_is_take_off_line
{
    my $line = shift;
    if ($line =~ /#include <Imlib2\.h>$/ ||
        $line =~ /imlib_create_image/    ||
        $line =~ /ngx_http_small_light_(jpeg|imlib2)\.(c|h)/)
    {
        return 1;
    }
    return 0;
}

sub gd_is_take_off_line
{
    my $line = shift;
    if ($line =~ /#include <gd\.h>$/ ||
        $line =~ /gdImageCreate/     ||
        $line =~ /gdImagePtr/        ||
        $line =~ /gdImageWebpPtr/    ||
        $line =~ /ngx_http_small_light_gd\.(c|h)/)
    {
        return 1;
    }
    return 0;
}

sub gd_is_enabled_webp
{
    my $gd_libs = shift;
    if ($gd_libs =~ /-lvpx/) {
        return 1;
    }
    return 0;
}

sub gd_webp_is_take_off_line
{
    my $line = shift;
    if ($line =~ /img_gd_webp/) {
        return 1;
    }
    return 0;
}

sub xxx_set_enabled
{
    my @args = @_;
    my $c    = $#args + 1;
    my $imagemagick_enabled = 1; # default
    my $imlib2_enabled      = 0;
    my $gd_enabled          = 0;
    for (my $i=0;$i<$c;$i++) {
        my $arg = $args[$i];
        if($arg eq "--with-imlib2") {
            $imlib2_enabled = 1;
        } elsif ($arg eq "--with-gd") {
            $gd_enabled = 1;
        }else {
            print "unrecognized option: " . $arg . "\n";
            exit;
        }
    }
    return ($imagemagick_enabled, $imlib2_enabled, $gd_enabled);
}

my $imagemagick_enabled;
my $imlib2_enabled;
my $gd_enabled;

($imagemagick_enabled, $imlib2_enabled, $gd_enabled) = xxx_set_enabled(@ARGV);

my $wand_libs     = `pkg-config MagickWand --libs`;
my $wand_lds      = `pkg-config MagickWand --libs`;
my $wand_includes = `pkg-config MagickWand --cflags`;

chomp($wand_libs);
chomp($wand_lds);
chomp($wand_includes);

my $imlib2_libs     = "";
my $imlib2_includes = "";
if ($imlib2_enabled == 1) {
    $imlib2_libs     = `pkg-config imlib2 --libs`;
    $imlib2_libs     =~ s/\s*?\@my_libs\@\s*?//;
    $imlib2_includes = `pkg-config imlib2 --cflags`;
    chomp($imlib2_libs);
    chomp($imlib2_includes);
    # the output of `imlib2-config --libs` does not include '-ljpeg'.
    $imlib2_libs    .= " -ljpeg";
}

my $gd_libs     = "";
my $gd_lds      = "";
my $gd_includes = "";
if ($gd_enabled == 1) {
    $gd_libs     = `pkg-config gdlib --libs`;
    $gd_libs     =~ s/\s*?\@LIBICONV\@\s*?//;
    $gd_lds      = `pkg-config gdlib --libs`;
    $gd_includes = `pkg-config gdlib --cflags`;
    chomp($gd_libs);
    chomp($gd_includes);
    # the output of `gdlib-config --libs` does not include '-lgd'.(This is a bug of GD)
    $gd_libs    .= " -lgd";
}

my $libs     = $wand_libs . " " . $imlib2_libs . " " . $gd_libs;
my $lds      = $wand_lds . " " . $gd_lds;
my $includes = $wand_includes . " " . $imlib2_includes . " " . $gd_includes;
my $includes_exclude_not_include = $includes;
$includes_exclude_not_include    =~ s/-fopenmp//;

my $macro_imlib2_enabled = "";
my $macro_gd_enabled     = "";

if ($imlib2_enabled == 1) {
    $macro_imlib2_enabled = "-DNGX_HTTP_SMALL_LIGHT_IMLIB2_ENABLED";
}

if ($gd_enabled == 1) {
    $macro_gd_enabled = "-DNGX_HTTP_SMALL_LIGHT_GD_ENABLED";
}

open(CONFIG_IN, "< config.in") or die("config.in not found");
open(CONFIG,    "> config")    or die("open config failed");

while (my $line = <CONFIG_IN>) {
    $line =~ s/\{\$ngx_feature_libs\}/$libs $lds/;
    $line =~ s/\{\$ngx_feature_inc_path\}/$includes_exclude_not_include/;
    if ($imlib2_enabled != 1) {
        if (imlib2_is_take_off_line($line)) {
            next;
        }
        $line =~ s/\{\$CFLAGS\}/$includes $macro_imlib2_enabled $macro_gd_enabled/;
    } else {
        $line =~ s/\{\$CFLAGS\}/$includes $macro_imlib2_enabled $macro_gd_enabled/;
    }
    if ($gd_enabled != 1) {
        $line =~ s/\{\$GD_WEBP_FLAGS\}//;
        if (gd_is_take_off_line($line)) {
            next;
        }
    } else {
        if (!gd_is_enabled_webp($gd_libs)) {
            $line =~ s/\{\$GD_WEBP_FLAGS\}//;
            if (gd_webp_is_take_off_line($line)) {
                next;
            }
        } else {
            my $macro_gd_webp_enabled = "-DNGX_HTTP_SMALL_LIGHT_GD_WEBP_ENABLED";
            $line =~ s/\{\$GD_WEBP_FLAGS\}/$macro_gd_webp_enabled/;
        }
        $line =~ s/\{\$CFLAGS\}/$includes $macro_imlib2_enabled $macro_gd_enabled/;
    }
    print CONFIG $line;
}

close(CONFIG_IN);
close(CONFIG);

print("config is generated.\n");