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Conditional Compiling in Latex based on Filename

If you want to generate two versions of a document, for example one for online reading with hyperlinks and another one for printing, with footnotes instead of hyperlinks [1], you can use this trick:

\usepackage{substr}

\newif\ifPaper
% that inside a package, where I can pass "paper" as an option
\DeclareOption{paper}{\global\Papertrue} 

% if substring "paper" is found in the job (file) name, set the flag
\IfSubStringInString{\detokenize{paper}}{\jobname}{\Papertrue}{} 

then you create a link command accordingly:

\newcommand{\link}[2]{
\ifPaper#1\footnote{\url{#2}}\else\href{#2}{#1}\fi
}

and finally you create a link (symbolic or hard, it doesn't matter) and compile one version or the other:

ln -s myfile.tex myfile-paper.tex
pdflatex myfile
pdflatex myfile-paper

(I guess that some LaTeX packages already do that for free, but conditional compilation can have many other usages.)

1: http://blog.0x972.info/?d=2014/10/29/09/55/15-conditional-compiling-in-latex-based-on-filename