xkeyval — read keys from file












5















I want to read xkeyval options from an external file, like:



setkeys{my@keys}{input{conf}}


I tried several combinations of edef and expandafter, but to no avail. Any ideas?



Best regards,



Nicolas






expansion key-value xkeyval







share|improve this question





























    5















    I want to read xkeyval options from an external file, like:



    setkeys{my@keys}{input{conf}}


    I tried several combinations of edef and expandafter, but to no avail. Any ideas?



    Best regards,



    Nicolas






    expansion key-value xkeyval







    share|improve this question



























      5












      5








      5








      I want to read xkeyval options from an external file, like:



      setkeys{my@keys}{input{conf}}


      I tried several combinations of edef and expandafter, but to no avail. Any ideas?



      Best regards,



      Nicolas






      expansion key-value xkeyval







      share|improve this question
















      I want to read xkeyval options from an external file, like:



      setkeys{my@keys}{input{conf}}


      I tried several combinations of edef and expandafter, but to no avail. Any ideas?



      Best regards,



      Nicolas






      expansion key-value xkeyval




      expansion key-value xkeyval






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 5 hours ago









      Phelype Oleinik

      25.9k54691




      25.9k54691










      asked 9 hours ago









      NicolaF_NicolaF_

      563




      563






















          1 Answer
          1






          active

          oldest

          votes


















          5














          You can't edef an input because it isn't expandable. You have to first read the contents of the file to a temporary variable and then pass that to setkeys.



          Here's an expl3 implementation of setkeysFile. It's the same as the standard setkeys except that the second argument is a file that (should) contain a comma separated list of key-value pairs.



          RequirePackage{filecontents}
          
begin{filecontents*}{conf.tex}
          
hello = world :D,
          
goodnews = everyone!,
          
end{filecontents*}
          
documentclass{article}
          
usepackage{xkeyval}
          
makeatletter
          
define@key{my@keys}{hello}{deftowhom{#1}}
          
define@key{my@keys}{goodnews}{defwho{#1}}
          
makeatother
          

          
usepackage{xparse}
          
ExplSyntaxOn
          
tl_new:N l__nicolas_setkeys_tl
          
NewDocumentCommand setkeysFile { m m }
          
  {
          
    file_get:nnNTF {#2} {} l__nicolas_setkeys_tl
          
      { exp_args:NnV setkeys {#1} l__nicolas_setkeys_tl }
          
      { __kernel_msg_error:nnn { kernel } { file-not-found } {#2} }
          
  }
          
ExplSyntaxOff
          

          
begin{document}
          

          
setkeysFile{my@keys}{conf}
          

          
Hello towhom
          

          
Good news who
          

          
end{document}


          this prints:




          enter image description here







          share|improve this answer





















          • 1





            exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

            – egreg
            9 hours ago













          • Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

            – Phelype Oleinik
            9 hours ago








          • 1





            @PhelypeOleinik Because a V-type argument must be a single token

            – Joseph Wright♦
            9 hours ago











          • @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

            – Phelype Oleinik
            9 hours ago











          • @PhelypeOleinik I took the liberty of streamlining your code.

            – egreg
            5 hours ago












          Your Answer








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          1 Answer
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          1 Answer
          1






          active

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          active

          oldest

          votes






          active

          oldest

          votes









          5














          You can't edef an input because it isn't expandable. You have to first read the contents of the file to a temporary variable and then pass that to setkeys.



          Here's an expl3 implementation of setkeysFile. It's the same as the standard setkeys except that the second argument is a file that (should) contain a comma separated list of key-value pairs.



          RequirePackage{filecontents}
          
begin{filecontents*}{conf.tex}
          
hello = world :D,
          
goodnews = everyone!,
          
end{filecontents*}
          
documentclass{article}
          
usepackage{xkeyval}
          
makeatletter
          
define@key{my@keys}{hello}{deftowhom{#1}}
          
define@key{my@keys}{goodnews}{defwho{#1}}
          
makeatother
          

          
usepackage{xparse}
          
ExplSyntaxOn
          
tl_new:N l__nicolas_setkeys_tl
          
NewDocumentCommand setkeysFile { m m }
          
  {
          
    file_get:nnNTF {#2} {} l__nicolas_setkeys_tl
          
      { exp_args:NnV setkeys {#1} l__nicolas_setkeys_tl }
          
      { __kernel_msg_error:nnn { kernel } { file-not-found } {#2} }
          
  }
          
ExplSyntaxOff
          

          
begin{document}
          

          
setkeysFile{my@keys}{conf}
          

          
Hello towhom
          

          
Good news who
          

          
end{document}


          this prints:




          enter image description here







          share|improve this answer





















          • 1





            exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

            – egreg
            9 hours ago













          • Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

            – Phelype Oleinik
            9 hours ago








          • 1





            @PhelypeOleinik Because a V-type argument must be a single token

            – Joseph Wright♦
            9 hours ago











          • @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

            – Phelype Oleinik
            9 hours ago











          • @PhelypeOleinik I took the liberty of streamlining your code.

            – egreg
            5 hours ago
















          5














          You can't edef an input because it isn't expandable. You have to first read the contents of the file to a temporary variable and then pass that to setkeys.



          Here's an expl3 implementation of setkeysFile. It's the same as the standard setkeys except that the second argument is a file that (should) contain a comma separated list of key-value pairs.



          RequirePackage{filecontents}
          
begin{filecontents*}{conf.tex}
          
hello = world :D,
          
goodnews = everyone!,
          
end{filecontents*}
          
documentclass{article}
          
usepackage{xkeyval}
          
makeatletter
          
define@key{my@keys}{hello}{deftowhom{#1}}
          
define@key{my@keys}{goodnews}{defwho{#1}}
          
makeatother
          

          
usepackage{xparse}
          
ExplSyntaxOn
          
tl_new:N l__nicolas_setkeys_tl
          
NewDocumentCommand setkeysFile { m m }
          
  {
          
    file_get:nnNTF {#2} {} l__nicolas_setkeys_tl
          
      { exp_args:NnV setkeys {#1} l__nicolas_setkeys_tl }
          
      { __kernel_msg_error:nnn { kernel } { file-not-found } {#2} }
          
  }
          
ExplSyntaxOff
          

          
begin{document}
          

          
setkeysFile{my@keys}{conf}
          

          
Hello towhom
          

          
Good news who
          

          
end{document}


          this prints:




          enter image description here







          share|improve this answer





















          • 1





            exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

            – egreg
            9 hours ago













          • Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

            – Phelype Oleinik
            9 hours ago








          • 1





            @PhelypeOleinik Because a V-type argument must be a single token

            – Joseph Wright♦
            9 hours ago











          • @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

            – Phelype Oleinik
            9 hours ago











          • @PhelypeOleinik I took the liberty of streamlining your code.

            – egreg
            5 hours ago














          5












          5








          5







          You can't edef an input because it isn't expandable. You have to first read the contents of the file to a temporary variable and then pass that to setkeys.



          Here's an expl3 implementation of setkeysFile. It's the same as the standard setkeys except that the second argument is a file that (should) contain a comma separated list of key-value pairs.



          RequirePackage{filecontents}
          
begin{filecontents*}{conf.tex}
          
hello = world :D,
          
goodnews = everyone!,
          
end{filecontents*}
          
documentclass{article}
          
usepackage{xkeyval}
          
makeatletter
          
define@key{my@keys}{hello}{deftowhom{#1}}
          
define@key{my@keys}{goodnews}{defwho{#1}}
          
makeatother
          

          
usepackage{xparse}
          
ExplSyntaxOn
          
tl_new:N l__nicolas_setkeys_tl
          
NewDocumentCommand setkeysFile { m m }
          
  {
          
    file_get:nnNTF {#2} {} l__nicolas_setkeys_tl
          
      { exp_args:NnV setkeys {#1} l__nicolas_setkeys_tl }
          
      { __kernel_msg_error:nnn { kernel } { file-not-found } {#2} }
          
  }
          
ExplSyntaxOff
          

          
begin{document}
          

          
setkeysFile{my@keys}{conf}
          

          
Hello towhom
          

          
Good news who
          

          
end{document}


          this prints:




          enter image description here







          share|improve this answer















          You can't edef an input because it isn't expandable. You have to first read the contents of the file to a temporary variable and then pass that to setkeys.



          Here's an expl3 implementation of setkeysFile. It's the same as the standard setkeys except that the second argument is a file that (should) contain a comma separated list of key-value pairs.



          RequirePackage{filecontents}
          
begin{filecontents*}{conf.tex}
          
hello = world :D,
          
goodnews = everyone!,
          
end{filecontents*}
          
documentclass{article}
          
usepackage{xkeyval}
          
makeatletter
          
define@key{my@keys}{hello}{deftowhom{#1}}
          
define@key{my@keys}{goodnews}{defwho{#1}}
          
makeatother
          

          
usepackage{xparse}
          
ExplSyntaxOn
          
tl_new:N l__nicolas_setkeys_tl
          
NewDocumentCommand setkeysFile { m m }
          
  {
          
    file_get:nnNTF {#2} {} l__nicolas_setkeys_tl
          
      { exp_args:NnV setkeys {#1} l__nicolas_setkeys_tl }
          
      { __kernel_msg_error:nnn { kernel } { file-not-found } {#2} }
          
  }
          
ExplSyntaxOff
          

          
begin{document}
          

          
setkeysFile{my@keys}{conf}
          

          
Hello towhom
          

          
Good news who
          

          
end{document}


          this prints:




          enter image description here








          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 9 hours ago









          egreg

          736k8919353261




          736k8919353261










          answered 9 hours ago









          Phelype OleinikPhelype Oleinik

          25.9k54691




          25.9k54691








          • 1





            exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

            – egreg
            9 hours ago













          • Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

            – Phelype Oleinik
            9 hours ago








          • 1





            @PhelypeOleinik Because a V-type argument must be a single token

            – Joseph Wright♦
            9 hours ago











          • @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

            – Phelype Oleinik
            9 hours ago











          • @PhelypeOleinik I took the liberty of streamlining your code.

            – egreg
            5 hours ago














          • 1





            exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

            – egreg
            9 hours ago













          • Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

            – Phelype Oleinik
            9 hours ago








          • 1





            @PhelypeOleinik Because a V-type argument must be a single token

            – Joseph Wright♦
            9 hours ago











          • @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

            – Phelype Oleinik
            9 hours ago











          • @PhelypeOleinik I took the liberty of streamlining your code.

            – egreg
            5 hours ago








          1




          1





          exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

          – egreg
          9 hours ago







          exp_args:NnV setkeys{#1} l__nicolas_setkeys_tl already supplies the braces and is more correct code anyhow. The ior_open:Nn business is useless.

          – egreg
          9 hours ago















          Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

          – Phelype Oleinik
          9 hours ago







          Thanks :-) But why more correct? Oh, nevermind, it's because V gets the value of a register, and a register is an N type. Am I correct?

          – Phelype Oleinik
          9 hours ago






          1




          1





          @PhelypeOleinik Because a V-type argument must be a single token

          – Joseph Wright♦
          9 hours ago





          @PhelypeOleinik Because a V-type argument must be a single token

          – Joseph Wright♦
          9 hours ago













          @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

          – Phelype Oleinik
          9 hours ago





          @JosephWright Thanks! Some day I'll learn how to use expl3 properly :)

          – Phelype Oleinik
          9 hours ago













          @PhelypeOleinik I took the liberty of streamlining your code.

          – egreg
          5 hours ago





          @PhelypeOleinik I took the liberty of streamlining your code.

          – egreg
          5 hours ago


















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