TeX - LaTeX Asked by Leonardo Alvaro on August 23, 2021
I want to implement something with the same structure as the next command:
documentclass{article}
usepackage{xargs}
providecommandx*{countryinfo}[4][{3=undefined},{4=In #2 people like drinking #1.}]{%
noindent
1: #1
2: #2
3: #3
4: #4
}
begin{document}
countryinfo{beer}{Germany}
countryinfo{tequila}{Mexico}[Mexico City]
countryinfo{vodka}{Russia}[Moskow][Russia is the biggest country in the world.]
end{document}
But it gives an error due to the default optional fourth argument’s definition.
If I remove the #2 and #1 from the default optional argument’s definition everything works just fine.
But I want to know, how can I make this happen?
It's very easy with xparse
:
documentclass{article}
usepackage{xparse}
NewDocumentCommand{countryinfo}{
m % mandatory
m % mandatory
O{undefined} % optional, default 'undefined'
O{In #2 people like drinking #1.} % optional, default as defined
}{%
noindent
1: #1
2: #2
3: #3
4: #4
}
begin{document}
countryinfo{beer}{Germany}
countryinfo{tequila}{Mexico}[Mexico City]
countryinfo{vodka}{Russia}[Moskow][Russia is the biggest country in the world.]
end{document}
Correct answer by egreg on August 23, 2021
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