A command challenge












6















Here's a little challenge. The goal is to create a command that takes is two or three arguments without using square brackets for optional arguments. The first and second argument are separated by a comma and a space, while the second and the third (if present) are separated by a dash. This means that both of the following inputs should be acceptable



mycommand{arg_1, arg_2}


and



mycommand{arg_1, arg_2-arg_3}


The definition of what mycommand does with the two/three arguments is irrelevant to the problem.






macros expl3 xparse







share|improve this question


















  • 1





    That's one argument from a TeX point of view ... I guess you want a parser for that one document-level argument.

    – Joseph Wright♦
    4 hours ago











  • Try defmycommand#1,space#2-#3{...}.

    – John Kormylo
    48 mins ago


















6















Here's a little challenge. The goal is to create a command that takes is two or three arguments without using square brackets for optional arguments. The first and second argument are separated by a comma and a space, while the second and the third (if present) are separated by a dash. This means that both of the following inputs should be acceptable



mycommand{arg_1, arg_2}


and



mycommand{arg_1, arg_2-arg_3}


The definition of what mycommand does with the two/three arguments is irrelevant to the problem.






macros expl3 xparse







share|improve this question


















  • 1





    That's one argument from a TeX point of view ... I guess you want a parser for that one document-level argument.

    – Joseph Wright♦
    4 hours ago











  • Try defmycommand#1,space#2-#3{...}.

    – John Kormylo
    48 mins ago
















6












6








6


1






Here's a little challenge. The goal is to create a command that takes is two or three arguments without using square brackets for optional arguments. The first and second argument are separated by a comma and a space, while the second and the third (if present) are separated by a dash. This means that both of the following inputs should be acceptable



mycommand{arg_1, arg_2}


and



mycommand{arg_1, arg_2-arg_3}


The definition of what mycommand does with the two/three arguments is irrelevant to the problem.






macros expl3 xparse







share|improve this question














Here's a little challenge. The goal is to create a command that takes is two or three arguments without using square brackets for optional arguments. The first and second argument are separated by a comma and a space, while the second and the third (if present) are separated by a dash. This means that both of the following inputs should be acceptable



mycommand{arg_1, arg_2}


and



mycommand{arg_1, arg_2-arg_3}


The definition of what mycommand does with the two/three arguments is irrelevant to the problem.






macros expl3 xparse




macros expl3 xparse






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 4 hours ago









noibenoibe

935




935








  • 1





    That's one argument from a TeX point of view ... I guess you want a parser for that one document-level argument.

    – Joseph Wright♦
    4 hours ago











  • Try defmycommand#1,space#2-#3{...}.

    – John Kormylo
    48 mins ago
















  • 1





    That's one argument from a TeX point of view ... I guess you want a parser for that one document-level argument.

    – Joseph Wright♦
    4 hours ago











  • Try defmycommand#1,space#2-#3{...}.

    – John Kormylo
    48 mins ago










1




1





That's one argument from a TeX point of view ... I guess you want a parser for that one document-level argument.

– Joseph Wright♦
4 hours ago





That's one argument from a TeX point of view ... I guess you want a parser for that one document-level argument.

– Joseph Wright♦
4 hours ago













Try defmycommand#1,space#2-#3{...}.

– John Kormylo
48 mins ago







Try defmycommand#1,space#2-#3{...}.

– John Kormylo
48 mins ago












3 Answers
3






active

oldest

votes


















7














You can do it with xparse:



documentclass{article}

usepackage{xparse}



% split at the comma

NewDocumentCommand{mycommand}{ >{SplitArgument{1}{,}}m }{%

  mycommandA#1%

}

% do something with #1 and split the second part at the hyphen

NewDocumentCommand{mycommandA}{ m >{SplitArgument{1}{-}}m }{%

  Main is #1%

  IfNoValueTF{#2}{.}{; mycommandB#2}%

}

% do something with the second part

NewDocumentCommand{mycommandB}{mm}{%

  Secondary is #1IfValueT{#2}{ plus #2}.%

}



begin{document}



mycommand{arg1}



mycommand{arg1, arg2}



mycommand{arg1, arg2-arg3}



end{document}


enter image description here



An advantage: it's irrelevant if you forget the space after the comma.






share|improve this answer































    10














    enter image description here



    documentclass{article}
    

    
defmycommand#1{xmycommand#1--relax}
    
defxmycommand#1,#2-#3-#4relax{[#1][#2][#3]}
    

    

    
begin{document}
    

    
$mycommand{arg_1, arg_2}$
    

    
$mycommand{arg_1, arg_2-arg3}$
    

    
end{document}





    share|improve this answer



















    • 6





      Even without electricity. I'm impressed!

      – marmot
      4 hours ago











    • How about adding some mortar to the bricks!?

      – Werner
      4 hours ago











    • @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

      – David Carlisle
      4 hours ago











    • @DavidCarlisle: It seems drafty... :D

      – Werner
      4 hours ago






    • 2





      @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

      – David Carlisle
      3 hours ago



















    2














    A listofitems approach.



    documentclass{article}
    
usepackage{listofitems}
    
newcommandmycommand[1]{setsepchar{,/-}readlist*myargs{#1}%
    
  noindent Arg 1 is myargs[1]\
    
  Arg 2 is myargs[2,1]\
    
  Arg 3 is ifnumlistlenmyargs[2]=1relax Absentelsemyargs[2,2]fi%
    
}
    
begin{document}
    

    
mycommand{arg1, arg2}
    

    
and
    

    
mycommand{arg1, arg2-arg3}
    

    
end{document}


    enter image description here






    share|improve this answer























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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

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      active

      oldest

      votes






      active

      oldest

      votes









      7














      You can do it with xparse:



      documentclass{article}
      
usepackage{xparse}
      

      
% split at the comma
      
NewDocumentCommand{mycommand}{ >{SplitArgument{1}{,}}m }{%
      
  mycommandA#1%
      
}
      
% do something with #1 and split the second part at the hyphen
      
NewDocumentCommand{mycommandA}{ m >{SplitArgument{1}{-}}m }{%
      
  Main is #1%
      
  IfNoValueTF{#2}{.}{; mycommandB#2}%
      
}
      
% do something with the second part
      
NewDocumentCommand{mycommandB}{mm}{%
      
  Secondary is #1IfValueT{#2}{ plus #2}.%
      
}
      

      
begin{document}
      

      
mycommand{arg1}
      

      
mycommand{arg1, arg2}
      

      
mycommand{arg1, arg2-arg3}
      

      
end{document}


      enter image description here



      An advantage: it's irrelevant if you forget the space after the comma.






      share|improve this answer




























        7














        You can do it with xparse:



        documentclass{article}
        
usepackage{xparse}
        

        
% split at the comma
        
NewDocumentCommand{mycommand}{ >{SplitArgument{1}{,}}m }{%
        
  mycommandA#1%
        
}
        
% do something with #1 and split the second part at the hyphen
        
NewDocumentCommand{mycommandA}{ m >{SplitArgument{1}{-}}m }{%
        
  Main is #1%
        
  IfNoValueTF{#2}{.}{; mycommandB#2}%
        
}
        
% do something with the second part
        
NewDocumentCommand{mycommandB}{mm}{%
        
  Secondary is #1IfValueT{#2}{ plus #2}.%
        
}
        

        
begin{document}
        

        
mycommand{arg1}
        

        
mycommand{arg1, arg2}
        

        
mycommand{arg1, arg2-arg3}
        

        
end{document}


        enter image description here



        An advantage: it's irrelevant if you forget the space after the comma.






        share|improve this answer


























          7












          7








          7







          You can do it with xparse:



          documentclass{article}
          
usepackage{xparse}
          

          
% split at the comma
          
NewDocumentCommand{mycommand}{ >{SplitArgument{1}{,}}m }{%
          
  mycommandA#1%
          
}
          
% do something with #1 and split the second part at the hyphen
          
NewDocumentCommand{mycommandA}{ m >{SplitArgument{1}{-}}m }{%
          
  Main is #1%
          
  IfNoValueTF{#2}{.}{; mycommandB#2}%
          
}
          
% do something with the second part
          
NewDocumentCommand{mycommandB}{mm}{%
          
  Secondary is #1IfValueT{#2}{ plus #2}.%
          
}
          

          
begin{document}
          

          
mycommand{arg1}
          

          
mycommand{arg1, arg2}
          

          
mycommand{arg1, arg2-arg3}
          

          
end{document}


          enter image description here



          An advantage: it's irrelevant if you forget the space after the comma.






          share|improve this answer













          You can do it with xparse:



          documentclass{article}
          
usepackage{xparse}
          

          
% split at the comma
          
NewDocumentCommand{mycommand}{ >{SplitArgument{1}{,}}m }{%
          
  mycommandA#1%
          
}
          
% do something with #1 and split the second part at the hyphen
          
NewDocumentCommand{mycommandA}{ m >{SplitArgument{1}{-}}m }{%
          
  Main is #1%
          
  IfNoValueTF{#2}{.}{; mycommandB#2}%
          
}
          
% do something with the second part
          
NewDocumentCommand{mycommandB}{mm}{%
          
  Secondary is #1IfValueT{#2}{ plus #2}.%
          
}
          

          
begin{document}
          

          
mycommand{arg1}
          

          
mycommand{arg1, arg2}
          

          
mycommand{arg1, arg2-arg3}
          

          
end{document}


          enter image description here



          An advantage: it's irrelevant if you forget the space after the comma.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 4 hours ago









          egregegreg

          718k8719043200




          718k8719043200























              10














              enter image description here



              documentclass{article}
              

              
defmycommand#1{xmycommand#1--relax}
              
defxmycommand#1,#2-#3-#4relax{[#1][#2][#3]}
              

              

              
begin{document}
              

              
$mycommand{arg_1, arg_2}$
              

              
$mycommand{arg_1, arg_2-arg3}$
              

              
end{document}





              share|improve this answer



















              • 6





                Even without electricity. I'm impressed!

                – marmot
                4 hours ago











              • How about adding some mortar to the bricks!?

                – Werner
                4 hours ago











              • @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

                – David Carlisle
                4 hours ago











              • @DavidCarlisle: It seems drafty... :D

                – Werner
                4 hours ago






              • 2





                @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

                – David Carlisle
                3 hours ago
















              10














              enter image description here



              documentclass{article}
              

              
defmycommand#1{xmycommand#1--relax}
              
defxmycommand#1,#2-#3-#4relax{[#1][#2][#3]}
              

              

              
begin{document}
              

              
$mycommand{arg_1, arg_2}$
              

              
$mycommand{arg_1, arg_2-arg3}$
              

              
end{document}





              share|improve this answer



















              • 6





                Even without electricity. I'm impressed!

                – marmot
                4 hours ago











              • How about adding some mortar to the bricks!?

                – Werner
                4 hours ago











              • @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

                – David Carlisle
                4 hours ago











              • @DavidCarlisle: It seems drafty... :D

                – Werner
                4 hours ago






              • 2





                @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

                – David Carlisle
                3 hours ago














              10












              10








              10







              enter image description here



              documentclass{article}
              

              
defmycommand#1{xmycommand#1--relax}
              
defxmycommand#1,#2-#3-#4relax{[#1][#2][#3]}
              

              

              
begin{document}
              

              
$mycommand{arg_1, arg_2}$
              

              
$mycommand{arg_1, arg_2-arg3}$
              

              
end{document}





              share|improve this answer













              enter image description here



              documentclass{article}
              

              
defmycommand#1{xmycommand#1--relax}
              
defxmycommand#1,#2-#3-#4relax{[#1][#2][#3]}
              

              

              
begin{document}
              

              
$mycommand{arg_1, arg_2}$
              

              
$mycommand{arg_1, arg_2-arg3}$
              

              
end{document}






              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 4 hours ago









              David CarlisleDavid Carlisle

              489k4111321880




              489k4111321880








              • 6





                Even without electricity. I'm impressed!

                – marmot
                4 hours ago











              • How about adding some mortar to the bricks!?

                – Werner
                4 hours ago











              • @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

                – David Carlisle
                4 hours ago











              • @DavidCarlisle: It seems drafty... :D

                – Werner
                4 hours ago






              • 2





                @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

                – David Carlisle
                3 hours ago














              • 6





                Even without electricity. I'm impressed!

                – marmot
                4 hours ago











              • How about adding some mortar to the bricks!?

                – Werner
                4 hours ago











              • @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

                – David Carlisle
                4 hours ago











              • @DavidCarlisle: It seems drafty... :D

                – Werner
                4 hours ago






              • 2





                @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

                – David Carlisle
                3 hours ago








              6




              6





              Even without electricity. I'm impressed!

              – marmot
              4 hours ago





              Even without electricity. I'm impressed!

              – marmot
              4 hours ago













              How about adding some mortar to the bricks!?

              – Werner
              4 hours ago





              How about adding some mortar to the bricks!?

              – Werner
              4 hours ago













              @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

              – David Carlisle
              4 hours ago





              @Werner where I come from we prefer this style: derbyshireuk.net/derbyshire_drystonewalls.html

              – David Carlisle
              4 hours ago













              @DavidCarlisle: It seems drafty... :D

              – Werner
              4 hours ago





              @DavidCarlisle: It seems drafty... :D

              – Werner
              4 hours ago




              2




              2





              @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

              – David Carlisle
              3 hours ago





              @noibe oh no a disaster! I don't mind not getting the tick (I have more than enough points) but seeing points go to egreg is so depressing:)

              – David Carlisle
              3 hours ago











              2














              A listofitems approach.



              documentclass{article}
              
usepackage{listofitems}
              
newcommandmycommand[1]{setsepchar{,/-}readlist*myargs{#1}%
              
  noindent Arg 1 is myargs[1]\
              
  Arg 2 is myargs[2,1]\
              
  Arg 3 is ifnumlistlenmyargs[2]=1relax Absentelsemyargs[2,2]fi%
              
}
              
begin{document}
              

              
mycommand{arg1, arg2}
              

              
and
              

              
mycommand{arg1, arg2-arg3}
              

              
end{document}


              enter image description here






              share|improve this answer




























                2














                A listofitems approach.



                documentclass{article}
                
usepackage{listofitems}
                
newcommandmycommand[1]{setsepchar{,/-}readlist*myargs{#1}%
                
  noindent Arg 1 is myargs[1]\
                
  Arg 2 is myargs[2,1]\
                
  Arg 3 is ifnumlistlenmyargs[2]=1relax Absentelsemyargs[2,2]fi%
                
}
                
begin{document}
                

                
mycommand{arg1, arg2}
                

                
and
                

                
mycommand{arg1, arg2-arg3}
                

                
end{document}


                enter image description here






                share|improve this answer


























                  2












                  2








                  2







                  A listofitems approach.



                  documentclass{article}
                  
usepackage{listofitems}
                  
newcommandmycommand[1]{setsepchar{,/-}readlist*myargs{#1}%
                  
  noindent Arg 1 is myargs[1]\
                  
  Arg 2 is myargs[2,1]\
                  
  Arg 3 is ifnumlistlenmyargs[2]=1relax Absentelsemyargs[2,2]fi%
                  
}
                  
begin{document}
                  

                  
mycommand{arg1, arg2}
                  

                  
and
                  

                  
mycommand{arg1, arg2-arg3}
                  

                  
end{document}


                  enter image description here






                  share|improve this answer













                  A listofitems approach.



                  documentclass{article}
                  
usepackage{listofitems}
                  
newcommandmycommand[1]{setsepchar{,/-}readlist*myargs{#1}%
                  
  noindent Arg 1 is myargs[1]\
                  
  Arg 2 is myargs[2,1]\
                  
  Arg 3 is ifnumlistlenmyargs[2]=1relax Absentelsemyargs[2,2]fi%
                  
}
                  
begin{document}
                  

                  
mycommand{arg1, arg2}
                  

                  
and
                  

                  
mycommand{arg1, arg2-arg3}
                  

                  
end{document}


                  enter image description here







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 3 hours ago









                  Steven B. SegletesSteven B. Segletes

                  154k9198405




                  154k9198405






























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