#!/usr/bin/env perl

#    Copyright 2009 Joseph E. Fields
#    email: fieldsj1@southernct.edu
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

$version = "0.2";

# Version 0.2
#  Changed hashbang to use the '/usr/bin/env perl' hack for portability
#  Added a check on the return status of open("> Makefile").
#
# Version 0.1
#  Original release.

#default values of a few variables

$mag_factor = 1.0;
$pdflatex = 0;
$figure_directory = "./";


&parse_command_line;


if ($figure_directory =~ m/\/$/) {
  $pref = $figure_directory;
} else {
  $pref = $figure_directory . "/";
}
  

#Look for files ending with the .fig extension in the current directory.

opendir(THISDIR, ".");
@fig_files = grep(/\.fig$/, readdir(THISDIR));

open(MAKEFILE, "> Makefile") || die "Can't open Makefile for write. \n"; ;

#First we run through the list of .fig files to make a list of corresponding
#.tex files these are used as the dependencies for the "all" target.

@tex_files = ();
@base_names = ();

foreach $fig (@fig_files) {
  $tex_file_name = $fig;
  $base = $fig;
  $tex_file_name =~ s/\.fig$/\.tex/;
  $base =~ s/\.fig$//;
  push(@tex_files, $tex_file_name);
  push(@base_names, $base);
}
print MAKEFILE "\#\n\# fig4latex makefile\n\#\n\n";
print MAKEFILE "all: @tex_files\n\n";

#For each .fig file we need to add appropriate lines to the Makefile

if ($pdflatex == 1){
    $ext = ".pdf";
} else {
    $ext = ".eps";
}

foreach $nm (@base_names) {
  print MAKEFILE "\# translation into pstex\n\n";
  print MAKEFILE "$nm\.tex: $nm$ext \n";
  print MAKEFILE "\tfig2dev -L pstex_t -p $pref$nm$ext -m $mag_factor $nm\.fig > $nm\.tex\n\n";
  print MAKEFILE "$nm\.pdf: $nm\.eps \n";
  print MAKEFILE "\tepstopdf $nm\.eps\n\n";
  print MAKEFILE "$nm\.eps: $nm\.fig \n";
  print MAKEFILE "\tfig2dev -L pstex -m $mag_factor $nm\.fig > $nm\.eps\n\n";
  print MAKEFILE "clean::\n";
  print MAKEFILE "\trm -f $nm\.tex $nm\.eps $nm\.pdf\n\n\n";
}

close(MAKEFILE);

print "\nNow run \'make\' to update your graphics files.\n\n";
print "If you are changing from PdfLaTeX (-p) to LaTeX (-l), or vice versa, \n";
print "run \'make clean\' then \'make\'.\n\n";

sub parse_command_line{ 
    while ($ARGV[0] =~ /^-/) {
	$_ = shift @ARGV;               # in a subroutine 
	if (/^-m$/) { 
	    $mag_factor = shift @ARGV; 
	    if ( ! ($mag_factor > 0.0)  ) { 
		print "\nThe next thing after the -m option is supposed to be a number\n";       
		die("Bad arg for -m (magnification factor): $mag_factor\n\n");
	    } 
	} 
	elsif (/^-p$/) { 
	    $pdflatex = 1; 
	} 
	elsif (/^-l$/) { 
	    $pdflatex = 0; 
	} 
	elsif (/^-d$/) { 
	    $figure_directory = shift @ARGV;
	    if (! (-d "../".$figure_directory)) {
		print "\nArgument after -d must be the name of the directory\n";
		print "containing the figures, which you should currently be in!\n\n";
		die;
	    }  
	    if ($figure_directory eq "") {
		print "\nPlease specify a path to the figures (relative to the\n";
		print " LaTeX source files). \n\n";
		die;
	    }
	} 
	elsif (/^-h$/ || /^--help$/) { 
	    &usage && die; 
	} 
	elsif (/^--version$/) {
	    print "\nThis is Fig4latex, version $version.\n\n";
	    die;
	}
	else { 
	    &usage && die; 
	} 
    }
} 

sub usage{ 
  print <<"MULTILINE";

Usage: fig4latex [-d dir] [-m NUM] [-p] [-l] [-h] 

 -d DIR Directory containing the figures (a path relative to
        the directory where your LaTeX source files are).
 -m NUM Magnification factor.
 -p Pdflatex -- create makefile for use with pdflatex -- the images
    get converted to pdf format. 
 -l Latex -- create makefile for use with (regular) latex -- the images
    are exported as eps format. (this is the default)
 -h Help -- print this message and quit.

This program creates a Makefile.  Running 'make' will then search the
current director for .fig files and use fig2dev (pstex and pstex_t) to 
create .tex files which are \input into your latex file to include the 
graphic.  Any text in the figure with the 'special' flag set is processed
by LaTeX.
MULTILINE
}