#! /usr/bin/perl

use File::FnMatch qw(fnmatch);
use MdwOpt;

our $CROSSDIR = "@crossdir@";
(our $ME = $0) =~ s:^.*/::;

###--------------------------------------------------------------------------
### Utilities.

sub usage (*) {
  my ($fh) = @_;
  print $fh
    "usage: $ME [-kns] [-j N] =ARCHGLOB|:FLAVOUR ... [--] CMD [ARGS ...]\n";
}
sub barf ($) {
  my ($msg) = @_;
  print STDERR "$0: $msg\n";
  exit 2;
}

###--------------------------------------------------------------------------
### Read and prepare the configuration.

our %C = ();
open my $fh, "<", "$CROSSDIR/etc/config.sh" or barf "open config: $!";
while (<$fh>) {
  chomp;
  if (/^\s*(#|$)/) { next; }
  if (!/^([^=]+)='(.*)'$/) { barf "bad config line `$_'"; }
  my ($k, $v) = ($1, $2);
  $v =~ s/'\\''/'/g;
  $C{$k} = $v;
}

our @ALLARCH;
our %FLAVOUR;
for my $f (split ' ', $C{"FLAVOURS"}) {
  (my $v = $f) =~ tr/-/_/;
  my @a = split ' ', $C{"${v}_ARCHS"};
  @{$FLAVOUR{$f}} = @a;
  push @ALLARCH, @a;
}

###--------------------------------------------------------------------------
### Parse the command line.

our @ARCH = ();
our $JOBS = undef;
our $KEEPGOING = 0;
our $SILENT = 0;
our $DRYRUN = 0;
our $DIR = ".";
our $MARKER = "{}";
our @CMD = ();

my $mo = new MdwOpt "hC:j:km:ns",
  { "help" => { 'return' => "h" },
    "directory" => { 'return' => 'C', 'arg' => 'req' },
    "jobs" => { 'return' => "j", 'arg' => 'req' },
    "keep-going" => { 'return' => "k" },
    "marker" => { 'return' => "m", 'arg' => 'req' },
    "dry-run" => { 'return' => "n" },
    "silent" => { 'return' => "s" } },
  \@ARGV,
  ['inorder'];
my $bad = 0;
OPT: for (;;) {
  my ($opt, $arg) = $mo->read;
  last OPT unless defined $opt;
  if ($opt eq "h") { usage STDOUT; exit 0; }
  elsif ($opt eq "C") { $DIR = $arg; }
  elsif ($opt eq "j")
    { $arg =~ /^[+]?\d+$/ or barf "bad integer `$arg'"; $JOBS = $arg; }
  elsif ($opt eq "k") { $KEEPGOING = 1; }
  elsif ($opt eq "m") { $MARKER = $arg; }
  elsif ($opt eq "n") { $DRYRUN = $arg; }
  elsif ($opt eq "s") { $SILENT = $arg; }
  elsif ($opt eq '') {
    if ($arg =~ /^=(.*)$/) {
      my $pat = $1;
      my $match = 0;
      ARCH: for my $a (@ALLARCH) {
	next ARCH unless fnmatch $pat, $a;
	$match = 1; push @ARCH, $a;
      }
      $match or barf "no architectures match `$pat'";
    } elsif ($arg =~ /^:(.*)$/) {
      my $f = $1;
      exists $FLAVOUR{$f} or barf "no architeture flavour `$f'";
      push @ARCH, @{%FLAVOUR{$f}};
    } else {
      push @CMD, $arg;
      last OPT;
    }
  } else {
    $bad = 1;
  }
}
$bad = 1 unless @ARCH && @CMD;
push @CMD, $mo->rest, @{$mo->{argv}};
if ($bad) { usage STDERR; exit 2; }

###--------------------------------------------------------------------------
### Hack the arguments and run `make'.

sub hack ($) {
  my ($x) = @_;
  $x =~ s/'/'\\''/g;
  $x =~ s/\$/\$\$/g;
  $x =~ s/\Q$MARKER/\$*/g;
  return "'$x'";
}

our $TARGET = "run";
if ($CMD[0] eq 'make') { $TARGET = "run-make"; shift @CMD; }
our @MAKE = ("make");
push @MAKE, "-f$CROSSDIR/Makefile";
push @MAKE, "-j$JOBS" if defined $JOBS;
push @MAKE, "-k" if $KEEPGOING;
push @MAKE, "-n" if $DRYRUN;
push @MAKE, "-s" if $SILENT;
push @MAKE, $TARGET;
push @MAKE, "ARCHS=" . join " ", @ARCH;
push @MAKE, "ARGS=" . join " ", map { hack $_ } @CMD;
push @MAKE, "CROSSDIR=$CROSSDIR";
push @MAKE, "DIR=" . hack $DIR;
exec @MAKE;
barf "make: $!";

###----- That's all, folks --------------------------------------------------