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How can I set the margins around all tabulars to zero by default?
The margins around a single tabular can be removed using @{}, see below, but I have dozens of tables and would like to have a single switch for all of them.
\begin{tabular}{@{}ll@{}}
Just for fun. This trims off the edge using a \makebox. The \fbox is just to show the actual dimensions.
\documentclass{standalone}
\let\oldtabular=\tabular
\let\oldendtabular=\endtabular
\def\tabular{\bgroup\sbox0\bgroup\oldtabular}
\def\endtabular{\oldendtabular\egroup
\makebox[\dimexpr\wd0-2\tabcolsep][c]{\usebox0}%
\egroup}
\begin{document}
\fboxsep=0pt
\fbox{\begin{tabular}{lr}
this&is\\
why&I\\
hate&making\\
My&own MWE
\end{tabular}}
\end{document}
@{}.\newenvironment{mytabular}[1]{\tabular{@{}#1@{}}}{\endtabular}. By renamingtabularto e.g.origtabularfirst (\let\origtabular\tabular \let\endorigtabular\endtabular) you can even patch the environment and keeping the orginal name.