How to detect whether PassOptionsToPackage was already called?












1















If I call:



PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}



% And later someone else call again

PassOptionsToPackage{style=abnt,backend=biber}{biblatex}


What will happen?



Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?






optional-arguments package-options class-options options







share|improve this question



























    1















    If I call:



    PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}
    

    
% And later someone else call again
    
PassOptionsToPackage{style=abnt,backend=biber}{biblatex}


    What will happen?



    Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?






    optional-arguments package-options class-options options







    share|improve this question

























      1












      1








      1


      1






      If I call:



      PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}
      

      
% And later someone else call again
      
PassOptionsToPackage{style=abnt,backend=biber}{biblatex}


      What will happen?



      Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?






      optional-arguments package-options class-options options







      share|improve this question














      If I call:



      PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}
      

      
% And later someone else call again
      
PassOptionsToPackage{style=abnt,backend=biber}{biblatex}


      What will happen?



      Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?






      optional-arguments package-options class-options options




      optional-arguments package-options class-options options






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 5 hours ago









      useruser

      1,2602930




      1,2602930






















          1 Answer
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          oldest

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          2














          The definition of PassOptionsToPackage is



          % latex.ltx, line 7784:
          
defPassOptionsToPackage{@pass@ptions@pkgextension}


          and we can look at @pass@ptions:



          % latex.ltx, line 7778:
          
def@pass@ptions#1#2#3{%
          
  expandafterxdefcsname opt@#3.#1endcsname{%
          
    @ifundefined{opt@#3.#1}@empty
          
      {csname opt@#3.#1endcsname,}%
          
    zap@space#2 @empty}}


          Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.



          The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.



          As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.



          This should also answer your question about detection: you can use 



          ifcsname opt@foo.styendcsname
          
  <options have already been passed or the package has already been loaded>
          
else
          
  <no options have been passed yet>
          
fi





          share|improve this answer
























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            active

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            2














            The definition of PassOptionsToPackage is



            % latex.ltx, line 7784:
            
defPassOptionsToPackage{@pass@ptions@pkgextension}


            and we can look at @pass@ptions:



            % latex.ltx, line 7778:
            
def@pass@ptions#1#2#3{%
            
  expandafterxdefcsname opt@#3.#1endcsname{%
            
    @ifundefined{opt@#3.#1}@empty
            
      {csname opt@#3.#1endcsname,}%
            
    zap@space#2 @empty}}


            Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.



            The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.



            As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.



            This should also answer your question about detection: you can use 



            ifcsname opt@foo.styendcsname
            
  <options have already been passed or the package has already been loaded>
            
else
            
  <no options have been passed yet>
            
fi





            share|improve this answer




























              2














              The definition of PassOptionsToPackage is



              % latex.ltx, line 7784:
              
defPassOptionsToPackage{@pass@ptions@pkgextension}


              and we can look at @pass@ptions:



              % latex.ltx, line 7778:
              
def@pass@ptions#1#2#3{%
              
  expandafterxdefcsname opt@#3.#1endcsname{%
              
    @ifundefined{opt@#3.#1}@empty
              
      {csname opt@#3.#1endcsname,}%
              
    zap@space#2 @empty}}


              Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.



              The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.



              As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.



              This should also answer your question about detection: you can use 



              ifcsname opt@foo.styendcsname
              
  <options have already been passed or the package has already been loaded>
              
else
              
  <no options have been passed yet>
              
fi





              share|improve this answer


























                2












                2








                2







                The definition of PassOptionsToPackage is



                % latex.ltx, line 7784:
                
defPassOptionsToPackage{@pass@ptions@pkgextension}


                and we can look at @pass@ptions:



                % latex.ltx, line 7778:
                
def@pass@ptions#1#2#3{%
                
  expandafterxdefcsname opt@#3.#1endcsname{%
                
    @ifundefined{opt@#3.#1}@empty
                
      {csname opt@#3.#1endcsname,}%
                
    zap@space#2 @empty}}


                Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.



                The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.



                As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.



                This should also answer your question about detection: you can use 



                ifcsname opt@foo.styendcsname
                
  <options have already been passed or the package has already been loaded>
                
else
                
  <no options have been passed yet>
                
fi





                share|improve this answer













                The definition of PassOptionsToPackage is



                % latex.ltx, line 7784:
                
defPassOptionsToPackage{@pass@ptions@pkgextension}


                and we can look at @pass@ptions:



                % latex.ltx, line 7778:
                
def@pass@ptions#1#2#3{%
                
  expandafterxdefcsname opt@#3.#1endcsname{%
                
    @ifundefined{opt@#3.#1}@empty
                
      {csname opt@#3.#1endcsname,}%
                
    zap@space#2 @empty}}


                Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.



                The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.



                As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.



                This should also answer your question about detection: you can use 



                ifcsname opt@foo.styendcsname
                
  <options have already been passed or the package has already been loaded>
                
else
                
  <no options have been passed yet>
                
fi






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 4 hours ago









                egregegreg

                732k8919303253




                732k8919303253






























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