as I said before, in Persian we have two footnotes, one for Persian and the other for English, if the first footnote in a pageis English, then footnote rule will appear on left hand side and if the first footnote in a pgeis persian, the footnote appears on right .
handside.
this is the code taken from xepersian which does automatic footnoterule, it produces a file-name.fot
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% footnote setup %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifx \CatEscape\undefined
\chardef\CatEscape=0
\chardef\CatOpen=1
\chardef\CatClose=2
\chardef\CatIgnore=9
\chardef\CatLetter=11
\chardef\CatOther=12
\chardef\CatActive=13 % is defined in Plain already
\chardef\CatUsCode=\catcode`\_
\fi
\catcode`\_=\CatLetter % top level macro file
\def\r@fn{%
\hbox to \columnwidth
{\beginR \vbox{\kern -3\p@
\hrule width .4\columnwidth \kern2.6\p@}\hfil\endR}}
\def\l@fn{%
\hrule width .4\columnwidth\kern 2.6\p@}
\def\@makefnmark{\hbox{$^{\hbox{\scriptsize\@thefnmark}}\m@th$}}
\def\leftfootnoterule{\global\def\footnoterule{\l@fn}}
\def\rightfootnoterule{\global\def\footnoterule{\r@fn}}
\leftfootnoterule
%%% \beginprog
\newread\old_foot_file
\newwrite\foot_file
\def\foot_file_name{\jobname.fot\relax}
\def\init_footnote{%
\openin\old_foot_file\foot_file_name
\ifeof\old_foot_file \closein\old_foot_file
\else \closein\old_foot_file
\read_foot_file
\fi
\immediate\openout\foot_file\foot_file_name
\immediate\write\foot_file{\relax}%
\global\let\init_footnote\relax
}
\newcount\foot_name_no % for generating footnote mark names
\newcount\autofootnote
\def\fnpp_next_footnote{%
\init_footnote
\global\advance\foot_name_no\@ne
\global\advance\c@footnote\@ne
\edef\do_write{%
\immediate\write\foot_file{%
\string\advance\autofootnote\@ne
\string\expandafter\xdef
\string\csname\space f@\number\foot_name_no \endcsname{%
\string\number\autofootnote
}%
}%
}%
\do_write
\global\autofootnote 0\csname f@\number\foot_name_no \endcsname \relax
}
\def\read_foot_file{%
\begingroup
\catcode`\@\CatLetter \catcode`\^^M\CatIgnore
\input \foot_file_name
\endgroup
}
\let\fnpp_orig_outputpage=\@outputpage
\def\@outputpage{%
\ifx \init_footnote\relax
\immediate\write\foot_file{\autofootnote\z@}%
\fi
\fnpp_orig_outputpage
}
\let\FnppOrigFootnote=\footnote % save original bindings
\let\FnppOrigFootnotemark=\footnotemark
\def\footnote{%
\@ifnextchar[% % ] (Emacs)
\@xfootnote
{\fnpp_next_footnote \ifnum\autofootnote=1\rightfootnoterule\fi \@xfootnote[\the\c@footnote] %
}%
}
\def\footnotemark{%
\@ifnextchar[% % ] (Emacs)
\@xfootnotemark
{\fnpp_next_footnote \ifnum\autofootnote=1\rightfootnoterule\fi \@xfootnotemark[\the\c@footnote]}%
}
\def\footnotemarkLR{%
\@ifnextchar[% % ] (Emacs)
\@xfootnotemark
{\fnpp_next_footnote \ifnum\autofootnote=1\leftfootnoterule\fi\@xfootnotemark[\the\c@footnote]}%
}
\newif\if@RomanFootNum
\providerobustcmd{\Footnote}[1]{%
\bgroup
\footnotemarkLR%
\renewcommand{\thefootnote}{\if@RomanFootNum\rmfamily{\@arabic\c@footnote}\else\@arabic\c@footnote\fi}%
\@RTLfalse\footnotetext{\rmfamily#1}%
\egroup
}
\@RomanFootNumfalse
\def\PersianFootNum{\@RomanFootNumfalse}
\def\RomanFootNum{\@RomanFootNumtrue}
\DeclareOption{RomanFootNum}{\@RomanFootNumtrue}
\ProcessOptions
\ifx \@minipagerestore\relax
\let\@minipagerestore\@empty
\fi
\g@addto@macro\@minipagerestore{%
\let\footnote\FnppOrigFootnote
}
\let\fnpp_orig_maketitle=\maketitle
\def\maketitle{%
\begingroup
\let\footnotemark\FnppOrigFootnotemark
\fnpp_orig_maketitle
\endgroup
}
\catcode`\_=\CatUsCode
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% %
% End of footnote setup %
% %
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