#!/usr/bin/env perl 

use strict;
use warnings;
use lib qw(/home/agentz/gmake-db/lib /home/agentz/mdom-gmake/lib);

#use Smart::Comments;
use Getopt::Long;
use Makefile::Parser::GmakeDB;
use IPC::Run3;
use File::Slurp;
use Makefile::AST::Evaluator;
use List::Util 'first';

my $VERSION = $Makefile::Parser::GmakeDB::VERSION;

my @DefaultMakefile = (
    'GNUmakefile',
    'makefile',
    'Makefile'
);

my $user_makefile;
my $print_version;
my ($makefile, $njobs, @goals);
Getopt::Long::Configure ("bundling");
GetOptions(
    'f|file|makefile=s' => \$user_makefile,
    'j=s' => \$njobs,  # job server is not really supported
    'n|just-print|dry-run|recon' => \$Makefile::AST::Evaluator::JustPrint,
    's|silent|quiet'  => \$Makefile::AST::Evaluator::Quiet,
    'i|ignore-errors' => \$Makefile::AST::Evaluator::IgnoreErrors,
    'B|always-make' => \$Makefile::AST::Evaluator::AlwaysMake,
    'q|question' => \$Makefile::AST::Evaluator::Question,
    'v|version' => \$print_version,
) or die "Usage: $0 [-f makefile] goals...\n";
### $makefile
### @ARGV

if ($print_version) {
    print <<"_EOC_";
pgmake-db $VERSION
_EOC_
    exit 0;
}

if ($Makefile::AST::Evaluator::Question) {
    $Makefile::AST::Evaluator::Quiet = 1;
}
our $MAKE;
my @var_defs;
for my $arg (@ARGV) {
    if ($arg =~ /(.*?)=(.*)/) {
        my ($var, $value) = ($1, $2);
        if ($var eq 'MAKE') {
            $MAKE = $value;
        }
        push @var_defs, $arg;
    } else {
        push @goals, $arg;
    }
}
if (!defined $MAKE) {
    ($MAKE = $0) =~ s/.*[\\\/]//;
    push @var_defs, "MAKE=$MAKE";
}

$makefile = $user_makefile;
if (!defined $makefile) {
    $makefile = first { -f $_ } @DefaultMakefile;
} elsif ($makefile ne '-' and !-f $makefile) {
    warn "$MAKE: $makefile: No such file or directory\n";
    push @goals, $makefile; # This is required
}

### var defs via command line: @var_defs

my ($stdout, $stderr);
run3 ['make', '-pqRrs', '-f', $makefile, @var_defs], undef, \$stdout, \$stderr;
## $stderr
my $exit_code = $? >> 8;
if ($stderr and $exit_code == 2 and $stderr !~ /^make:/) {
    $stderr =~ s/^make:/$MAKE:/msg;
    warn $stderr;
    exit $exit_code;
}
if ($stderr =~ /warning: (overriding|ignoring old) commands for target/) {
    warn $stderr;
}

#die "GNU make stdout: $stdout\n";

# XXX debug only
write_file('/home/agentz/mdom-gmake/make.db', $stdout);

# patch the database output to work around gmake bugs
patch_database(\$stdout);

# XXX debug only
write_file('/home/agentz/mdom-gmake/make.db.patched', $stdout);

#if ($stdout =~ m{^\s*\./Makefile_\S+\s*:\s*[^\n]*$}ms) {
#    die $&;
#}
#print $stdout;
#exit 0;

$Makefile::AST::Runtime = 1;

my $ast = Makefile::Parser::GmakeDB->parse(\$stdout);
$ast->{makefile} = $makefile;
## $ast
## var a: $ast->get_var('a')
## var b: $ast->get_var('b')
#die;

my $default_goal = $ast->default_goal;
push @goals, $ast->default_goal
    if !@goals && defined $default_goal;
### @goals

if (!@goals && !defined $makefile) {
    warn "$MAKE: *** No targets specified and no makefile found.  Stop.\n";
    exit(2);
}

my $eval = Makefile::AST::Evaluator->new($ast);
$eval->set_required_target($user_makefile)
    if defined $user_makefile;
my $up_to_date = 1;
for my $goal (@goals) {
    ### goal: $goal
    $Makefile::AST::Evaluator::CmdRun = 0;
    my $res = $eval->make($goal);
    ### result: $res
    if ($res and $res eq 'UP_TO_DATE')  {
        if (!$Makefile::AST::Evaluator::Question and !$Makefile::AST::Evaluator::CmdRun) {
            print "$::MAKE: Nothing to be done for `$goal'.\n";
        }
    } else {
        $up_to_date = 0;
    }
}

if ($Makefile::AST::Evaluator::Question) {
    exit 0 if $up_to_date;
    exit 1;
}

# XXX promote the fixes on the GNU make side
sub patch_database {
    my $ref = shift;
    #$$ref =~ s/(\n\S+)#/$1\\#$2/gsm;
    $$ref =~ s/^([^\n]*)(?<!\\)\\(\S[^\n]*\n#  Implicit rule search has)/$1\\\\$2/msg;
    $$ref =~ s/^([^\n]*)(?<!\\)#(\S[^\n]*\n#  Implicit rule search has)/$1\\#$2/msg;
    $$ref =~ s/^([^\n]*)(?<!\\):(\S[^\n]*:\n#  Implicit rule search has)/$1\\:$2/msg;
}

__END__

=head1 NAME

pgmake-db - A make utility using Makefile::Parser::GmakeDB, Makefile::AST, and Makefile::AST::Evaluator

=head1 SYNOPSIS

    $ pgmake-db
    $ pgmake-db -f mine.mk

=head1 DESCRIPTION

This is a F<make> tool using L<Makefile::Parser::GmakeDB>, L<Makefile::AST>, and L<Makefile::AST::Evaluator>.

This script is primary for testing the whole toolchain via running GNU make's official test suite.

As of this writing, pgmake-db has already passed 51% of GNU make 3.81's test suite.

=head1 SVN REPOSITORY

For the very latest version of this script, check out the source from

L<http://github.com/agentzh/makefile-parser-pm>.

There is anonymous access to all.

=head1 AUTHOR

Zhang "agentzh" Yichun C<< <agentzh@gmail.com> >>

=head1 COPYRIGHT AND LICENSE

Copyright (c) 2007-2008 by Zhang "agentzh" Yichun (agentzh).

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=head1 SEE ALSO

L<Makefile::Parser::GmakeDB>, L<Makefile::AST>, L<Makefile::AST::Evaluator>, L<Makefile::Parser::GmakeDB>, L<pgmake-db>, L<makesimple>, L<Makefile::DOM>.