Macros generating hyperlinks with URLs passing arguments

[Eclair_de_XII]

TL;DR Summary

I am trying to create a macro that will pass a given string as an argument, to insert into the hyperlink that the macro will output. The problem is, that sometimes the given string will sometimes not be in lowercase, and the hyperlink will link to something else, because the site is case-sensitive.

My attempt resulted in the error found in the body of this message.

Running this

\documentclass{article}

\usepackage{hyperref}
\usepackage{textcase}

\newcommand{\wiki}[2]{\href{https://en.wikipedia.org/wiki/#1_\MakeLowercase{#2}}{Curriculum vitae}}

\begin{document}

\wiki{Curriculum}{Vitae} % Wikipedia redirects this URL to the one below
\href{\https://en.wikipedia.org/wiki/Curriculum_vitae} % This one takes the user directly to the intended page

\end{document}

gives

! Use of \Hy@href doesn't match its definition.
\MakeLowercase  #1->{\def \reserved@a ##
                                        1##2{\let ##2##1\reserved@a }\expand...

 

[DrClaude]

I got a feeling that the problem stems from the presence of \MakeLowercase inside \href.

What happens if you write it out directly without using the \wiki command?

 

[Eclair_de_XII]

I got a feeling that the problem stems from the presence of \MakeLowercase inside \href.

I do believe that is the problem, here. When typing out the hyperlink commands manually, I get a pdf document with a working hyperlink and all.

 

[DrClaude]

You can try

\newcommand{\wiki}[2]{\href{https://en.wikipedia.org/wiki/#1_\protect\MakeLowercase{#2}}{Curriculum vitae}}

but it might just be that what you are trying is not possible (commands in TeX are not exactly the same as macros).

 

[Eclair_de_XII]

I see. Thank you for your assistance, in any case.