Cfrgtkky

I have a small problem when trying to keep a key=val locally defining using xparse to pass multicols to enumerate (enumitem package). I have redefined the environment enumerate to accept the columns=number and created commands keyans[...], answer{...} and showanskey[...]{...}{...}[...] to save the multiple choice keys and answers for worksheet exercise , all well except that when activate the columns in the first level of enumerate, affects all the levels nested in it.

When using columns=2 in the first level it looks like this:

all nested environments are in two columns.

I hope is that the output is something like this:

I tried to put group_begin: and group_end: in different places but I only get errors. The code is adapted from Defining a list environment with multiple optional arguments and MWE:

% arara: pdflatex

% arara: clean: { extensions: [ aux, log] }

documentclass{article}

usepackage{letltxmacro,enumitem,multicol,xparse}

usepackage[most]{tcolorbox}

usepackage[margin=0.6in,noheadfoot,papersize={8.5in,13in}]{geometry} % for mwe

setlength{parindent}{0pt}

pagestyle{empty}



% Set keys for save-ans and save-key in enumitem

SetEnumitemKey{save-ans}{before={storecurrentid{#1}begin{saveanswer}{#1}},after=end{saveanswer}}%

SetEnumitemKey{save-key}{before={storecurrentid{#1}begin{savekeyans}{#1}},after=end{savekeyans}}%



% Save a copy enumerate

LetLtxMacrooldenumenumerate

LetLtxMacrooldendenumendenumerate



% Redefine enumerate for multicols

ExplSyntaxOn

RenewDocumentEnvironment{enumerate}{ O{} }

 {

  tl_clear:N l_keyanswer_enumitem_tl

  keys_set:nn { keyanswer } { #1 } 

  int_compare:nT { l_keyanswer_columns_tl > 1 } 

   { 

   setlength{multicolsep}{5.0pt plus 2.0pt minus 1.5pt}

   begin{multicols}{ l_keyanswer_columns_tl } 

   }

  keyanswer_beginenum:V l_keyanswer_enumitem_tl 

 }

 {

  oldendenum

  int_compare:nT { l_keyanswer_columns_tl > 1 }

   { end{multicols} }

 }

cs_new_protected:Npn keyanswer_beginenum:n #1

 { oldenum[#1] }



cs_generate_variant:Nn keyanswer_beginenum:n {V}



tl_new:N l_keyanswer_columns_tl

tl_new:N l_keyanswer_enumitem_tl



keys_define:nn { keyanswer }

 {

  columns .tl_set:N  = l_keyanswer_columns_tl,

  columns .initial:n = 1,

  unknown .code:n    = tl_put_right:Nx l_keyanswer_enumitem_tl 

                        { l_keys_key_tl tl_if_empty:nF { #1 } { = exp_not:n { #1 } } , },

 }



% Implementation to save answer{...} and keyans[...] in lists

prop_new:N g_keyanswer_admin_prop



cs_new:Npn storecurrentid #1{%

  prop_gput:Nnn g_keyanswer_admin_prop {current-id} {#1}

 }

cs_new:Npn retrievecurrentid {%

  prop_item:Nn g_keyanswer_admin_prop {current-id}

 }



% environments for save answer{...} and keyans[...]

NewDocumentEnvironment{saveanswer}{ m }{%

  setlist[enumerate,2]{leftmargin=16pt,nosep,itemsep=0pt,label=(alph*),before={stepdownlevel},after={stepuplevel}}%

  setlist[enumerate,3]{leftmargin=20pt,nosep,itemsep=0pt,label=Roman*.,before={stepdownlevel},after={stepuplevel}}%

  seq_if_exist:cF { l_keyanswer_data_#1_seq }{ seq_new:c { l_keyanswer_data_#1_seq }}

  }{ leavevmode }



NewDocumentEnvironment{savekeyans}{ m }{%

  setlist[enumerate,1]{left=0pt,labelsep=5pt,itemsep=1pt,label=arabic*.}%

  setlist[enumerate,2]{leftmargin=16pt,nosep,label=Alph*)}%

  seq_if_exist:cF { l_keyanswer_data_#1_seq }{%

    seq_new:c { l_keyanswer_data_#1_seq }}}{ leavevmode }



% commands answer{...} and keyans[...]

NewDocumentCommand{answer}{ +m }{%

  seq_gput_right:cn { l_keyanswer_data_ retrievecurrentid _seq }{item  #1}

  par%

 }



NewDocumentCommandkeyans{ !o }{%

 IfNoValueTF{#1}{%

  tl_set:Nn l_tmpa_tl {protectitem}%

  tl_put_right:Nx l_tmpa_tl {protectspace Alph{enumii}}% 

  seq_gput_right:cV { l_keyanswer_data_ retrievecurrentid _seq }{ l_tmpa_tl}%

  par%

    }{%

  seq_gput_right:cn { l_keyanswer_data_ retrievecurrentid _seq }{item #1}%

  par%

    }%

 }%



% stepdownlevel and stepuplevel for save in nested enumerate

newcommand{stepdownlevel}{%

  seq_gput_right:cn {l_keyanswer_data_ retrievecurrentid _seq} {item begin{enumerate}}

 }

newcommand{stepuplevel}{%

  seq_gput_right:cn {l_keyanswer_data_ retrievecurrentid _seq} {end{enumerate}}

 }



% Display answer{...} and keyans[...] in list by id

cs_new:Npn displayseqcontent #1#2 {%

  seq_if_empty:cF { l_keyanswer_data_#1_seq } {%

    seq_log:c { l_keyanswer_data_#1_seq }

    setlist[enumerate,1]{labelsep=5pt,label=arabic*.,leftmargin=15pt,labelsep=3pt,font=footnotesize,nosep,widest=80}%

    setlist[enumerate,2]{font=footnotesize,labelsep=5pt,leftmargin=0.6cm,nosep,label=(alph*)}%

    setlist[enumerate,3]{font=footnotesize,labelsep=5pt,leftmargin=0.3cm,nosep,label=Roman*.}%

    begin{enumerate}[#2] smallsetlength{columnsep}{0pt}

      seq_map_inline:cn { l_keyanswer_data_#1_seq } { ##1 }

    end{enumerate}

  }

 }

ExplSyntaxOff



% showanskey[tcolorbox]{title}{list ref}[columns]

DeclareTotalTColorBox{showanskey}{O{} m m O{4}}

 { colback=white,size=small,top=0mm,bottom=1.5mm, left=0mm,width=columnwidth,title filled,%

  fontupper=small,fonttitle=smallsffamily, adjusted title={#2},center title,#1}

 { displayseqcontent{#3}{columns=#4} }%



begin{document}



section{Multiple Choice}



begin{enumerate}[save-key=mchoice,left=0pt,columns=2]

item First type of questions

    begin{enumerate}

        item value 

        item value 

        item value

        item correct keyans

        item value 

    end{enumerate}

item Second type of questions

        begin{enumerate}[leftmargin=2pc,label=Roman*.]

            item $2alpha+2delta=90^{circ}$

            item $alpha=delta$ 

            item $angle EDF=45^{circ}$

        end{enumerate}

begin{enumerate}[columns=2]% 

        item I only 

        item II only keyans

        item I and II only

        item I and III only 

        item I, II, and III

end{enumerate}

%columnbreak % 

item Third type of questions

        begin{enumerate}[leftmargin=2pc,label=(arabic*)]

            item $2alpha+2delta=90^{circ}$

            item $angle EDF=45^{circ}$

        end{enumerate}

    begin{enumerate}

        item Altenativa A 

        item Altenativa B 

        item Altenativa C keyans

        item Altenativa D

        item Altenativa E 

    end{enumerate}

item Fourth type of question, a problem with numerical response keyans[$sqrt{2}$]



end{enumerate}



section{Worksheet}



begin{enumerate}[save-ans=Worksheet,left=0pt,labelsep=5pt,nosep,label=arabic*.,columns=2]

item Factor $x^{2}-2x+1$  answer{$left(x-1right)^{2}$} 

item Factor $3x+3y+3z$    answer{$3(x+y+z)$}

item True False

  begin{enumerate}

  item $alpha > delta$ answer{False}

  item LaTeX2e is cool? answer{Very True!}

  end{enumerate} 

item Related to Linux

  begin{enumerate}

  item You use linux? answer{Yes}

  item Usually uses the package manager? answer{Yes}

  item Rate the following package managers

        begin{enumerate}

        item dnf answer{good}

        item apt answer{very good}

        item yum answer{obsolete}

        end{enumerate}

  end{enumerate} 

end{enumerate}



section{Answers}

showanskey[colback=yellow!30!white]{Multiple Choice Keys}{mchoice}[5]

showanskey[colback=yellow!30!white]{Solution Worksheet}{Worksheet}[2]



section{Normal enumerate}

begin{enumerate}

item First level

    begin{enumerate}

        item Second level 

        item value 

        item begin{enumerate}

                item Third level

                item value

               end{enumerate}

    end{enumerate}

end{enumerate}



end{document}

If put in all sublevels columns=1 skip the problem, but, can't do this with showanskey. If instead of using RenewDocumentEnvironment{enumerate} I use directly

SetEnumitemKey{columns}{before=begin{multicols}{#1},after=end{multicols}}%

I get the following error:

! LaTeX3 Error: Variable l_keyanswer_data_mchoice_seq undefined.

How can i fix this?

Grateful

Once you set the keys, the values remain as stated.

You can simply restore a value by specifying the relevant key, before setting the specified ones:

keys_set:nn { keyanswer } { #1 } 

should become

keys_set:nn { keyanswer } { columns=1, #1 }