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Filename : currfile.sty
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\NeedsTeXFormat{LaTeX2e}[1999/12/01]
\ProvidesPackage{currfile}[%
    2013/02/01
    v0.7b
    Provides the file path elements of the current input file]
\RequirePackage{kvoptions}
\SetupKeyvalOptions{family=currfile,prefix=currfile@}

\@ifpackageloaded{fink}{%
    \DeclareStringOption[\fnk@mainext]{mainext}%
    \DeclareStringOption[\fnk@maindir]{maindir}%
    \DeclareBoolOption[true]{fink}%
    \PackageWarning{currfile}{Deprecated package 'fink' detected. %
      The 'fink' option will default to 'true'.^^J%
      If set to 'false' no 'fink' macros will be changed but they will stop
      working correctly!}%
}{%
    \DeclareStringOption[tex]{mainext}%
    \DeclareStringOption[\@currdir]{maindir}%
    \DeclareBoolOption[false]{fink}%
}%
\DeclareVoidOption{force}{\PassOptionsToPackage{force}{filehook}}
\DeclareBoolOption[false]{parent}
\DeclareBoolOption[false]{parents}
\DeclareBoolOption[false]{realmainfile}%
\let\ifcurrfile@realmainfile\relax
\DeclareBoolOption[false]{abspath}%
\RequirePackage{filehook}[2011/01/09]
\ProcessKeyvalOptions*\relax

\begingroup
\xdef\currfile@mainext{\currfile@mainext}%
\xdef\currfile@maindir{\currfile@maindir}%
\def\@tempa{./}%
\ifx\@tempa\currfile@maindir
    \global\let\currfile@maindir\@empty
\fi
\endgroup

\expandafter\ifx\csname ifcurrfile@realmainfile\endcsname\relax
    \ifcurrfile@abspath
        \currfile@realmainfiletrue
    \else
        \currfile@realmainfilefalse
    \fi
\fi

\ifcurrfile@abspath
    \RequirePackage{currfile-abspath}
\else
\ifcurrfile@realmainfile
    \RequirePackage{currfile-abspath}
\fi\fi
\filehook@prefixwarg\filehook@every@atbegin{%
  \currfile@push
  \currfile@set{#1}%
}
\filehook@appendwarg\filehook@every@atend{%
  \currfile@pop
}
\def\currfile@set#1{%
  \begingroup
    \currfile@setparent
    \edef\@filef@und{#1}%
    \ifx\input@path\@undefined\else
        \currfile@checkpath
    \fi
    \@onelevel@sanitize\@filef@und
    \let\filename@simple\currfile@parseext
    \let\filename@base\@gobble
    \expandafter\filename@parse\expandafter{\@filef@und}%
    \global\let\currfiledir\filename@area
    \global\let\currfilebase\filename@base
    \global\let\currfileext\filename@ext
    \xdef\currfilename{\currfilebase\ifx\currfileext\@empty\else.\currfileext\fi}%
    \xdef\currfilepath{\currfiledir\currfilename}%
    \ifcurrfile@abspath
        \getabspath\currfilepath
        \global\let\currfileabspath\theabspath
        \xdef\currfileabsdir{\theabsdir\currfiledir}%
    \fi
    \global\advance\c@currfiledepth by\@ne
  \endgroup
}
\ifcurrfile@parent
\ifcurrfile@abspath
\def\currfile@setparent{%
    \global\let\parentfiledir\currfiledir
    \global\let\parentfilebase\currfilebase
    \global\let\parentfileext\currfileext
    \global\let\parentfilename\currfilename
    \global\let\parentfilepath\currfilepath
    \global\let\parentfileabspath\currfileabspath
    \global\let\parentfileabsdir\currfileabsdir
}
\else
\def\currfile@setparent{%
    \global\let\parentfiledir\currfiledir
    \global\let\parentfilebase\currfilebase
    \global\let\parentfileext\currfileext
    \global\let\parentfilename\currfilename
    \global\let\parentfilepath\currfilepath
}
\fi
\else
\let\currfile@setparent\relax
\fi
\def\currfile@checkpath{%
    \openin\@inputcheck\@filef@und\relax
    \ifeof\@inputcheck
        \currfile@check@inputpath
    \fi
    \closein\@inputcheck
}
\def\currfile@check@inputpath{%
    \expandafter\@tfor
    \expandafter\@tempb
    \expandafter:\expandafter=\input@path\do{%
        \openin\@inputcheck\@tempb\@filef@und\relax
        \ifeof\@inputcheck\else
            \edef\@filef@und{\@tempb\@filef@und}%
            \@break@tfor
        \fi
    }%
}
\AtEndOfPackageFile*{import}{%
\def\currfile@checkpath{%
    \ifx\IfFileExists\@iffileonpath
        \currfile@check@inputpath
    \else
        \openin\@inputcheck\@filef@und\relax
        \ifeof\@inputcheck
            \currfile@check@inputpath
        \fi
    \fi
    \closein\@inputcheck
}%
}
\begingroup
\@makeother{.}
\gdef\currfile@parseext#1.#2\\{%
    \ifx\\#2\\%
        \ifx\filename@base\@gobble
            \def\filename@base{#1}%
            \let\filename@ext\currfile@defaultext%
        \else
            \def\filename@ext{#1}%
        \fi
    \else
        \edef\filename@base{\filename@base.#1}%
        \def\@tempa{\currfile@parseext#2\\}%
        \expandafter\@tempa
    \fi
}
\endgroup
\def\currfile@defaultext{tex}
\@onelevel@sanitize\currfile@defaultext
\ifcurrfile@abspath
\def\currfile@push{%
  \xdef\currfile@stack{%
    {\currfiledir}%
    {\currfilebase}%
    {\currfileext}%
    {\currfileabsdir}%
    \currfile@stack
  }%
}
\else
\def\currfile@push{%
  \xdef\currfile@stack{%
    {\currfiledir}%
    {\currfilebase}%
    {\currfileext}%
    \currfile@stack
  }%
}
\fi
\def\currfile@pop{%
  \ifcase0%
    \ifx\currfile@stack\empty 1\else
    \ifnum\c@currfiledepth<\@ne 1\fi\fi
  \relax
    \global\advance\c@currfiledepth by\m@ne
  \else
    \PackageWarning{currfile}{File stack underflow!}%
    \global\let\currfile@stack\currfile@stackinit
    \global\c@currfiledepth=\z@
  \fi
  \expandafter\currfile@pop@\currfile@stack\relax
  \relax\relax\relax\relax\relax\relax\relax
}
\ifcurrfile@abspath
\def\currfile@pop@#1#2#3#4{%
  \gdef\currfiledir{#1}%
  \gdef\currfilebase{#2}%
  \gdef\currfileext{#3}%
  \xdef\currfilename{\currfilebase\ifx\currfileext\empty\else.\currfileext\fi}%
  \xdef\currfilepath{\currfiledir\currfilename}%
  \gdef\currfileabsdir{#4}%
  \xdef\currfileabspath{\ifx\currfileabsdir\@empty\else\currfileabsdir\currfilename\fi}%
  \currfile@updatestack
}
\else
\def\currfile@pop@#1#2#3{%
  \gdef\currfiledir{#1}%
  \gdef\currfilebase{#2}%
  \gdef\currfileext{#3}%
  \xdef\currfilename{\currfilebase\ifx\currfileext\empty\else.\currfileext\fi}%
  \xdef\currfilepath{\currfiledir\currfilename}%
  \currfile@updatestack
}
\fi
\ifcurrfile@parent
\ifcurrfile@abspath
\def\currfile@updatestack#1#2#3#4#5\relax{%
  \gdef\parentfiledir{#1}%
  \gdef\parentfilebase{#2}%
  \gdef\parentfileext{#3}%
  \xdef\parentfilename{\parentfilebase\ifx\parentfileext\empty\else.\parentfileext\fi}%
  \xdef\parentfilepath{\parentfiledir\parentfilename}%
  \gdef\parentfileabsdir{#4}%
  \xdef\parentfileabspath{\ifx\parentfileabsdir\@empty\else\parentfileabsdir\parentfilename\fi}%
  \gdef\currfile@stack{{#1}{#2}{#3}{#4}#5}%
}
\else
\def\currfile@updatestack#1#2#3#4\relax{%
  \gdef\parentfiledir{#1}%
  \gdef\parentfilebase{#2}%
  \gdef\parentfileext{#3}%
  \xdef\parentfilename{\parentfilebase\ifx\parentfileext\empty\else.\parentfileext\fi}%
  \xdef\parentfilepath{\parentfiledir\parentfilename}%
  \gdef\currfile@stack{{#1}{#2}{#3}#4}%
}
\fi
\else
\def\currfile@updatestack#1\relax{%
  \gdef\currfile@stack{#1}%
}
\fi
\ifcurrfile@parents
\newcommand*\currfilegetparents{%
  \@tempcnta\@ne
  \expandafter\currfile@getparents\currfile@stack\relax
  \relax\relax\relax\relax\relax\relax\relax
}
\ifcurrfile@abspath
\def\currfile@getparents#1#2#3#4{%
  \@namedef{parentfiledir\romannumeral\@tempcnta}{#1}%
  \@namedef{parentfilebase\romannumeral\@tempcnta}{#2}%
  \@namedef{parentfileext\romannumeral\@tempcnta}{#3}%
  \expandafter\edef\csname parentfilename\romannumeral\@tempcnta\endcsname{#2\ifx\empty#3\empty\else.#3\fi}%
  \expandafter\edef\csname parentfilepath\romannumeral\@tempcnta\endcsname{#1\csname parentfilename\romannumeral\@tempcnta\endcsname}%
  \@namedef{parentfileabsdir\romannumeral\@tempcnta}{#4}%
  \expandafter\edef\csname parentfileabspath\romannumeral\@tempcnta\endcsname{%
    \expandafter\ifx\csname parentfileabsdir\romannumeral\@tempcnta\endcsname\@empty\else
      \csname parentfileabsdir\romannumeral\@tempcnta\endcsname
      \csname parentfilename\romannumeral\@tempcnta\endcsname
    \fi
  }%
  \ifnum\@tempcnta<\c@currfiledepth
    \advance\@tempcnta\@ne
    \expandafter\currfile@getparents
  \fi
}
\else
\def\currfile@getparents#1#2#3{%
  \@namedef{parentfiledir\romannumeral\@tempcnta}{#1}%
  \@namedef{parentfilebase\romannumeral\@tempcnta}{#2}%
  \@namedef{parentfileext\romannumeral\@tempcnta}{#3}%
  \expandafter\edef\csname parentfilename\romannumeral\@tempcnta\endcsname{#2\ifx\empty#3\empty\else.#3\fi}%
  \expandafter\edef\csname parentfilepath\romannumeral\@tempcnta\endcsname{#1\csname parentfilename\romannumeral\@tempcnta\endcsname}%
  \ifnum\@tempcnta<\c@currfiledepth
    \advance\@tempcnta\@ne
    \expandafter\currfile@getparents
  \fi
}
\fi
\newcommand\parentfile[2]{%
    \csname parentfile#1\romannumeral#2\endcsname
}
\fi
\let\currfile@stack\@empty
\let\currfiledir\@empty
\let\currfilebase\@empty
\let\currfileext\@empty
\let\currfilename\@empty
\let\currfilepath\@empty
\let\currfileabspath\@empty
\let\currfileabsdir\@empty
\newcounter{currfiledepth}
\global\c@currfiledepth\m@ne
\currfile@push
\ifcurrfile@realmainfile
    \getmainfile
    \ifx\themainfile\@empty
        \currfile@set{\currfile@maindir\jobname.\currfile@mainext}
    \else
        \currfile@set{\themainfile}
    \fi
\else
    \currfile@set{\currfile@maindir\jobname.\currfile@mainext}
\fi
\let\currfile@stackinit\currfile@stack
\let\currfile@abspathfalse\relax
\let\currfile@abspathtrue\relax
\newcommand*\ifcurrfilename{\begingroup\currfile@if\currfilename}
\newcommand*\ifcurrfilebase{\begingroup\currfile@if\currfilebase}
\newcommand*\ifcurrfileext{\begingroup\currfile@if\currfileext}
\newcommand*\ifcurrfiledir{\begingroup\currfile@if\currfiledir}
\newcommand*\ifcurrfilepath{\begingroup\currfile@if\currfilepath}
\ifcurrfile@abspath
\newcommand*\ifcurrfileabspath{\begingroup\currfile@if\currfileabspath}
\newcommand*\ifcurrfileabsdir{\begingroup\currfile@if\currfileabsdir}
\fi
\newcommand*\ifcurrfile[1]{%
    \begingroup
    \edef\@tempb{#1}%
    \@onelevel@sanitize\@tempb
    \currfile@if\@tempb
}
\def\currfile@if#1#2{%
    \edef\@tempa{#2}%
    \@onelevel@sanitize\@tempa
    \ifx\@tempa#1%
        \endgroup
        \expandafter\@firstoftwo
    \else
        \endgroup
        \expandafter\@secondoftwo
    \fi
}
\ifcurrfile@fink
    \def\finkfile{\currfilename}%
    \def\finkdir{\currfiledir}%
    \def\finkpath{\currfilepath}%
    \def\finkbase{\currfilebase}%
    \def\finkext{\currfileext}%
    \@ifpackageloaded{fink}{%
        \def\fink@restore#1{}%
    }{%
        \@namedef{ver@fink.sty}{2011/01/09}%
        \expandafter\edef\csname opt@fink.sty\endcsname{%
            maindir=\currfile@maindir,mainext=\currfile@mainext
        }%
    }%
\else
    \@ifpackageloaded{fink}{}{%
        \AtBeginOfPackageFile{fink}{%
            \PackageError{currfile}{The 'fink' package is now deprecated. %
             Load 'currfile' with the 'fink' option or see the upgrade guide in the manual}{}%
        }%
    }%
\fi
\endinput
%%
%% End of file `currfile.sty'.