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#!/usr/bin/perl -w
# $Id: //info.ravenbrook.com/project/mps/master/test/test/script/optproc#3 $
#
# subroutines for processing options to qa commands
# Each command can specify which options it requires,
# and what, if anything, they default to.
# In no default is specified, global defaults will be
# used, and if no global default is given, we'll get
# an error message.

1;

sub process_options {
 &parseoptions;
 &applydefaults;
}

sub requiredoptions {
 local ($pur, $missing, $report, $qa_opt) = ("", 0, "");
 local (@missopt);

 foreach (@_) {
  unless (&getoption($_)) {
   $missing = $missing + 1;
   push(@missopt, $_);
  }
 }
 if ($missing > 0) {
  if ($missing > 1) {
   $pur = "s";
  }
  print "Error: $qa_command requires the following option".
   $pur.":\n";
  &explainoptions(@missopt);
  die "\n";
 }
}

#
# Only cumulative options can appear twice.
#

sub parseoptions {
 local ($tem);

 @qa_args = ();

 while (defined ($_ = shift(@ARGV))) {
  if (/^\-+(.*)$/i) { # allow >1 minus sign before options!
   if ($qa_options{$1}) {
    $qa_opt_val = shift(@ARGV);
    &setonceoption($qa_options{$1}, $qa_opt_val);
   } else {
    $flag = $1;
    if ($1 =~ /^no/) { # prefix "no" negates any flag
     $flag =~ s/^no//;
     $qa_opt_val = "off";
    } else {
     $qa_opt_val = "on";
    }
    unless ($qa_flags{$flag}) {
     die "Unrecognized option or flag: $flag.\n";
    }
    &setonceoption($qa_flags{$flag}, $qa_opt_val);
   }
  } else {
   push(@qa_args, $_);
  }
 }
 @ARGV = @qa_args;
}

sub getoption {
 local ($opt) = @_;
 return eval "\$".$opt;
}

sub setoption {
 local ($opt, $val) = @_;
 if (defined $val) {
  eval "\$".$opt." = \$val";
 }
}

sub setonceoption {
 local ($opt, $val) = @_;
 if (defined &getoption($opt) && !exists $qa_cumulative_opts{$opt}) {
  die "Non-cumulative option $opt specified twice on command line.\n"
 }
 if (defined &getoption($opt)) {
  $val = &getoption($opt)." ".$val;
 }
 &setoption($opt, $val);
}

# 
# precedence for parameters is:
# 1. parameter supplied on command line
# 2. parameter supplied in MMQA_PARAMETERS
# 3. parameter supplied as MMQA_PARAM_<param>
#

sub getparameter {
 local ($par) = @_;
 &debug("*>*>*>$PARAMETERS<*<*<*");
 if ($PARAMETERS =~ /(^|.*?\s)$par\s*=\s*(\S+)(\s|$)/) {
  return $2;
 } else {
 return $ENV{"MMQA_PARAM_".$par};
 }
}

sub flagcode {
 local ($opt, $code) = @_;
 foreach $code (keys %qa_flags) {
  if ($qa_flags{$code} eq $opt) {
   return $code
  }
 }
 return 0;
}

sub optioncode {
 local ($opt, $code) = @_;
 foreach $code (keys %qa_options) {
  if ($qa_options{$code} eq $opt) {
   return $code
  }
 }
 return 0;
}

#
# for cumulative options, command line comes first
#

sub applydefaults {
 local ($opt, $val, %arr);

 %arr = (%qa_options, %qa_flags);

 foreach (keys %arr) {
  $opt = $arr{$_};
  $val = &getoption($opt);
  $var = $ENV{"MMQA_".$opt};
  $def = $qa_defaults{$opt};

  if (defined $val) {
   if (exists $qa_cumulative_opts{$opt} && defined $var) {
    $val .= " ".$var;
   }
  } else {
   if (defined $var) {
    $val = $var;
   } else {
    $val = $def;
   }
  }
  if (! defined $val) {
   $val = "";
  }
  &setoption($opt, $val);
 }
}

sub explainoptions {
 local (@keys) = @_;
 local ($optname, $optcode, $optcur);

 $~ = "OPTLIST";

 $optname = "OPTION";
 $optcode = "CODE";
 $optcur  = "CURRENT";
 write;
 print "\n";

 foreach $key (sort @keys) {
  $optname = "$key";
  if (&optioncode($key)) {
   $optcode = "-".&optioncode($key)." <val>";
  } elsif (&flagcode($key)) {
   $optcode = "-[no]".&flagcode($key);
  } else {
   $optcode = "";
  }
  $optcur = (&getoption($key) || "");
 write;
 }
}

sub displayalloptions {
 print"------------------------------------------------------------------------
 MMQA harness version $HARNESS_VERSION

";
 &explainoptions(values %qa_options, values %qa_flags);
 print"
 (Add MMQA_ to start of option to give environment variable)
";
 print"------------------------------------------------------------------------
";
}

format OPTLIST =
 @<<<<<<<<<<<<<<<<<<<<< @<<<<<<<<<<<<<< ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
$optname, $optcode, $optcur
~~                                      ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
$optcur
.