Btukfyl

I'd like to use letter style enumeration for two running lists, combined into one.

The two lists have letter enumeration J-journals and C-conference. Code and output below for the two lists.

Once combined as one single list, it would allow overlapping J and C items. such as: J3 C2 J2 J1 C1

Journal list:

begin{etaremune}

renewcommand{theenumi}{Jarabic{enumi}}

item Journal 1

item Journal 2

end{etaremune}



Conference list:

begin{etaremune}

renewcommand{theenumi}{Carabic{enumi}}

item Proceeding 1

item Proceeding 2

end{etaremune}

The following code should do what you want.
You need to compile it twice (like with etaremune) for the counter values to settle.

documentclass{article}



%% Counter for jcenum environments:

newcounter{jcenum}



%% Separate counters for journals and conferences:

newcounter{enumj} %% <- counts journals

newcounter{enumc} %% <- counts conferences

renewcommand*theenumj{Jarabic{enumj}}

renewcommand*theenumc{Carabic{enumc}}



%% A new enumeration environment based on itemize:

makeatletter %% <- make @ usable in macro names

newenvironment{jcenum}{%

  stepcounter{jcenum}%

  @ifundefined{enumjmax@arabic{jcenum}}{@namedef{enumjmax@arabic{jcenum}}{0}}{}%

  @ifundefined{enumcmax@arabic{jcenum}}{@namedef{enumcmax@arabic{jcenum}}{0}}{}%

  setcounter{enumj}{@nameuse{enumjmax@arabic{jcenum}}}%

  setcounter{enumc}{@nameuse{enumcmax@arabic{jcenum}}}%

  itemize

}{%

  %% Write the number of journals/conferences to the aux files:

  immediatewrite@auxout{%

    stringglobalstring@namedef{enumjmax@arabic{jcenum}}%

      {thenumexpr@nameuse{enumjmax@arabic{jcenum}}-value{enumj}+1}%

    stringglobalstring@namedef{enumcmax@arabic{jcenum}}%

      {thenumexpr@nameuse{enumcmax@arabic{jcenum}}-value{enumc}+1}%

  }%

  enditemize

}

makeatother  %% <- revert @



%% Separate item macros for journals and conferences:

newcommand*jitem{addtocounter{enumj}{-2}refstepcounter{enumj}item[theenumj.]}

newcommand*citem{addtocounter{enumc}{-2}refstepcounter{enumc}item[theenumc.]}



begin{document}



subsection*{First environment}



begin{jcenum}

jitem First journal label{firstitem}

citem First conference

citem Second conference

jitem Second journal

citem Third conference

end{jcenum}



noindent Reference to the first item: ref{firstitem}



subsection*{Second environment}



begin{jcenum}

jitem First journal

citem First conference

citem Second conference

end{jcenum}



end{document}