Hcfyk

I'm writing a macro that takes a string and it returns an href based on that string. The string could have 150 different values. My question is how to write this in an efficient way. Using pdflatex.

Here's what I've got right now, shortened to two conditions for explanation:

documentclass{article}

usepackage{hyperref}

newcommand{myref}[1]{%

   ifnumpdfstrcmp{#1}{aaa}=0%

      href{example.com/aaa}{my aaa link}

   fi

   ifnumpdfstrcmp{#1}{bbb}=0%

      href{example.com/bbb}{my bbb link}

   fi

}

begin{document}

Here is myref{aaa}.

end{document}

But of course once I get a success (#1=aaa, say), I'm still testing the other 149 conditions for no reason. How to code this efficiently?

I would e.g. create command names:

documentclass{article}

usepackage{hyperref}

makeatletter

@namedef{aaa@link}{href{example.com/aaa}{my aaa link}}

@namedef{bbb@link}{href{example.com/bbb}{my bbb link}}



newcommand{myref}[1]{%

 csname #1@linkendcsname}



begin{document}

Here is myref{aaa}.

end{document}

let biber do the searching for you:

assuming there is a file test.bib with

@online{tex,

  note={my aaa text},

  url={tex.stackexchange.com}

}



@online{google,

  note={my bbb text},

  url={www.google.com}

}

then

documentclass{article}

usepackage{biblatex}



addbibresource{test.bib}



DeclareFieldFormat{url}{href{#1}{printfield{note}}}

DeclareCiteCommand{myref}{}{usebibmacro{url}}{}{}



usepackage{hyperref}



begin{document}

Here is myref{tex}



myref{google}



end{document}

You can use xparse:

pdfcompresslevel=0

documentclass{article}

usepackage{xparse}

usepackage{hyperref}



ExplSyntaxOn



NewDocumentCommand{newref}{mmm}

 {% #1 = key, #2 = URL, #3 = description, #4 = options for href

  prop_gput:Nnx g_tima_sites_prop { #1 @ url } { tl_to_str:n { #2 } }

  prop_gput:Nnn g_tima_sites_prop { #1 @ desc } { #3 }

 }



NewDocumentCommand{myref}{m}

 {% #1 = key

  tima_href:xx

   { prop_item:Nn g_tima_sites_prop {#1 @ url } }

   { prop_item:Nn g_tima_sites_prop {#1 @ desc } }

 }



prop_new:N g_tima_sites_prop

cs_new_protected:Nn tima_href:nn { href{#1}{#2} }

cs_generate_variant:Nn tima_href:nn { xx }



ExplSyntaxOff



newref{texworks}{http://profs.scienze.univr.it/~gregorio/introtexworks}{TeX works intro}

newref{arara}{http://profs.scienze.univr.it/~gregorio/introarara}{Arara intro}

newref{tex.sx}{https://tex.stackexchange.com}{Nice site}



begin{document}



myref{texworks}



myref{arara}



myref{tex.sx}



end{document}