# src/pl/plperl/text2macro.pl

=head1 NAME

text2macro.pl - convert text files into C string-literal macro definitions

=head1 SYNOPSIS

  text2macro [options] file ... > output.h

Options:

  --prefix=S   - add prefix S to the names of the macros
  --name=S     - use S as the macro name (assumes only one file)
  --strip=S    - don't include lines that match perl regex S

=head1 DESCRIPTION

Reads one or more text files and outputs a corresponding series of C
pre-processor macro definitions. Each macro defines a string literal that
contains the contents of the corresponding text file. The basename of the text
file as capitalized and used as the name of the macro, along with an optional prefix.

=cut

use strict;
use warnings;

use Getopt::Long;

GetOptions(
	'prefix=s'  => \my $opt_prefix,
	'name=s'    => \my $opt_name,
	'strip=s'   => \my $opt_strip,
	'selftest!' => sub { exit selftest() },
) or exit 1;

die "No text files specified"
	unless @ARGV;

print qq{
/*
 * DO NOT EDIT - THIS FILE IS AUTOGENERATED - CHANGES WILL BE LOST
 * Written by $0 from @ARGV
 */
};

for my $src_file (@ARGV) {

	(my $macro = $src_file) =~ s/ .*? (\w+) (?:\.\w+) $/$1/x;

	open my $src_fh, $src_file # not 3-arg form
		or die "Can't open $src_file: $!";

	printf qq{#define %s%s \\\n},
		$opt_prefix || '',
		($opt_name) ? $opt_name : uc $macro;
	while (<$src_fh>) {
		chomp;

		next if $opt_strip and m/$opt_strip/o;

		# escape the text to suite C string literal rules
		s/\\/\\\\/g;
		s/"/\\"/g;

		printf qq{"%s\\n" \\\n}, $_;
	}
	print qq{""\n\n};
}

print "/* end */\n";

exit 0;


sub selftest {
	my $tmp = "text2macro_tmp";
	my $string = q{a '' '\\'' "" "\\"" "\\\\" "\\\\n" b};

	open my $fh, ">$tmp.pl" or die;
	print $fh $string;
	close $fh;

	system("perl $0 --name=X $tmp.pl > $tmp.c") == 0 or die;
	open $fh, ">>$tmp.c";
	print $fh "#include <stdio.h>\n";
	print $fh "int main() { puts(X); return 0; }\n";
	close $fh;
	system("cat -n $tmp.c");
	
	system("make $tmp") == 0 or die;
	open $fh, "./$tmp |" or die;
	my $result = <$fh>;
	unlink <$tmp.*>;

	warn "Test string: $string\n";
	warn "Result     : $result";
	die "Failed!" if $result ne "$string\n";
}
