%% To use, simply create diagram environments with code, being sure to
%% declare something named 'dia' in each, which will be rendered.  For example:
%%
%% \begin{diagram}[width=200]
%% import Data.List
%% dia = hcat . map circle . sort $ [4,8,9,2,3,6]
%% \end{diagram}


%% diagrams-latex.sty
%% Copyright (c) 2011-2012, Ryan Yates
%% 
%% Large portions copied from dot2texi.sty
%%
%% Copyright (c) 2007-2008, Kjell Magne Fauske
%%
%% Author: Kjell Magne Fauske <km@fauskes.net>
%%                             http://www.fauskes.net
%%

%% Copyright (c) 2005, Lars Kotthoff <metalhead@metalhead.ws>
%%
%% Large portions copied from pdftex,
%% Copyright (c) 2001-3, Radhakrishnan CV <cvr@river-valley.com>
%%                       Rajagopal CV <cvr3@river-valley.com>
%%                       http://www.river-valley.com
%%
%% River Valley Technologies, Floor III, SJP Buildings, Cotton Hills
%% Trivandrum, India 695014
%%
%% Tel: +91 471 233 7501
%%
%%                     Antoine Chambert-Loir
%%                     <chambert@math.polytechnique.fr>
%%                     http://www.math.polytechnique.fr/\protect \unhbox \voidb@x \penalty \@M \ {}chambert
%%
%% Ecole polytechnique, Palaiseau Cedex, France
%%
%% 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 2
%% 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 (gpl.txt); if not, write to the Free
%% Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
%% MA  02111-1307, USA.
%%

%% Copyright (C) 2007 by Will Robertson & Johannes Große

\NeedsTeXFormat{LaTeX2e}[1999/12/01]
\ProvidesPackage{diagrams-latex}[2012/04/07 v0.1 Generate diagrams embedded within LaTeX]
\RequirePackage{moreverb}
\RequirePackage{xkeyval}[2005/02/22]

\newif\ifdtt@ShellEscape
%\newif\ifmiktex \miktexfalse
\newif\ifdtt@ForceShellEscape \dtt@ForceShellEscapefalse
\newif\ifdtt@debug \dtt@debugfalse
\newif\ifdtt@autosize \dtt@autosizefalse
% Options related to shell escape
\DeclareOptionX{shell}{\dtt@ShellEscapetrue}
\DeclareOptionX{noshell}{\dtt@ShellEscapefalse}
\DeclareOptionX{forceshell}{\dtt@ForceShellEscapetrue\dtt@ShellEscapetrue}
\DeclareOptionX{miktex}{} % dummy (for backwards compatability)

% Options for setting output size
\DeclareOptionX{width}[]{\def\dtt@width{-w #1}}
\def\dtt@width{} % default output width
\DeclareOptionX{height}[]{\def\dtt@height{-h #1}}
\def\dtt@height{} % default output height

% Option for setting an output directory
\DeclareOptionX{outputdir}[]{\def\dtt@outputdir{#1}}
\def\dtt@outputdir{}
\DeclareOptionX{debug}{\dtt@debugtrue}

\newcommand\setoutputdir[1]{\def\dtt@outputdir{#1}}

% Options for setting backend
\DeclareOptionX{backend}[]{\def\dtt@backend{#1}}
\def\dtt@backend{cairo}  % use cairo as the default backend
\DeclareOptionX{extension}[]{\def\dtt@extension{#1}}
\def\dtt@extension{pdf}  % default output extension of .pdf

\ExecuteOptionsX{shell}

\ProcessOptionsX\relax


%% The platform detection code is copied from the ifplatform package
%% avaialable from: http://tug.ctan.org/tex-archive/macros/latex/contrib/ifplatform/
%% Copyright (C) 2007 by Will Robertson & Johannes Große
\newif\ifdtt@ShellEscapeEnabled
\newif\ifwindows
\edef\ip@file{\jobname.w18}
\edef\ip@sig{write18-test-\the\year\the\month\the\day\the\time}
\edef\ip@win{'\ip@sig'}
\def\ip@read@file{%
  \newread\instream
  \openin\instream=\ip@file
  \@tempcnta=\endlinechar
  \endlinechar=-1
  \read\instream to\@tempa
  \endlinechar=\@tempcnta
  \closein\instream}
\immediate\write18{echo \ip@win >"\ip@file"}
\IfFileExists{\ip@file}{\dtt@ShellEscapeEnabledtrue}{\dtt@ShellEscapeEnabledfalse}
\ifdtt@ShellEscapeEnabled
    \ip@read@file
    \ifx\@tempa\ip@sig
    \windowsfalse
    \else
    \ifx\@tempa\ip@win
        \windowstrue
    \fi
    \fi
    \immediate\write18{\ifwindows del \else rm -- \fi "\ip@file"}
\fi

\ifdtt@ForceShellEscape
    \PackageInfo{diagrams-latex}
    {ForceShellEscape enabled}
\fi

\ifdtt@ShellEscapeEnabled
    \PackageInfo{diagrams-latex}
    {XXX}
\else
    \PackageWarningNoLine{diagrams-latex}
        {Shell escape not enabled.\MessageBreak
        You'll need to compile the diagrams yourself.}
\fi
\newcounter{dtt@fignum}
\def\dtt@figname{\dtt@outputdir/\jobname-diagrams-latex-fig\thedtt@fignum}


%%%%%%%%%%%%%%%%% diagrams-latex code
% Most of the code is from dot2texi.sty

% Options
\define@key{dtt}{width}[]{%
    \def\dtt@width{-w #1}
}
\define@key{dtt}{height}[]{%
    \def\dtt@height{-h #1}
}

\define@key{dtt}{outputdir}[]{%
    \def\dtt@outputdir{#1}
}
\define@key{dtt}{file}[]{%
    \def\dtt@figname{\dtt@outputdir/#1}
}
\define@key{dtt}{backend}[]{%
    \def\dtt@backend{#1}
}
\define@key{dtt}{extension}[]{%
    \def\dtt@extension{#1}
}

\define@key{dtt}{shell}[]{\dtt@ShellEscapetrue}
\define@key{dtt}{noshell}[]{\dtt@ShellEscapefalse}

\newif\ifdtt@writetofile \dtt@writetofiletrue

\newwrite\verbatim@out
\def\diagramslatexverbatimwrite#1{%
    \def\BeforeStream{
        \message{Opening diagrams-latex stream #1
        }%
    }%
    \@bsphack
    \immediate\openout \verbatim@out #1
    \BeforeStream%
    \let\do\@makeother\dospecials
    \catcode`\^^M\active
    \def\verbatim@processline{%
        \immediate\write\verbatim@out
        {\the\verbatim@line}}%
    \verbatim@start%
}

\def\enddiagramslatexverbatimwrite{%
    \immediate\closeout\verbatim@out
    \@esphack
        \catcode`\\0
        \catcode`\{1
        \catcode`\}2
        \catcode`\$3
        \catcode`\&4
        \catcode`\^^M5
        \catcode`\#6
        \catcode`\^7
        \catcode`\_8
        \catcode`\~9% Added this one
        \catcode`\ 10
        \catcode`\%14}

\newenvironment{diagram}[1][]{\stepcounter{dtt@fignum}%
    \setkeys{dtt}{#1}
    \ifdtt@ForceShellEscape
        \dtt@ShellEscapetrue
    \fi
    \immediate\write18{mkdir -p \dtt@outputdir}
    \xdef\diagramslatexCutFile{\dtt@figname.hs}
    \diagramslatexverbatimwrite{\diagramslatexCutFile}}
    {\enddiagramslatexverbatimwrite%
    \diagramslatexgraphicsinclude}

\long\gdef\diagramslatexgraphicsprocess{%
    \ifdtt@ShellEscape
        \IfFileExists{\dtt@figname.hs}{%
            \immediate\write18{diagrams-builder-\dtt@backend\space -o \dtt@figname.\dtt@extension\space
                \dtt@width\space
                \dtt@height\space
                \dtt@figname.hs\space }%
            \IfFileExists{\dtt@figname.\dtt@extension}{%
                \PackageInfo{diagrams-latex}{\dtt@figname.hs converted}
            }
            {\PackageWarningNoLine{diagrams-latex}
                {Conversion of \dtt@figname.hs failed}}}{}
            \fi
}

\long\gdef\diagramslatexgraphicsinclude{\diagramslatexgraphicsprocess%
    \IfFileExists{\dtt@figname.\dtt@extension}{{\includegraphics{\dtt@figname.\dtt@extension}}}
    {\PackageWarningNoLine{diagrams-latex}
            {Please convert \dtt@figname.hs manually}}
}

\endinput