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Liam0205/everypar.tex Secret

Last active May 20, 2018 02:46
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demo for box opening and closing
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everypar.tex
% \UseBox 直接忽略参数
\def\UseBox#1{\relax}
\newbox\parbox
\everypar{\setbox\parbox=
\vbox\bgroup
\everypar{}
\def\par{\egroup\UseBox\parbox}}
% 因此，"Hello world!" 被吃进盒子之后没有机会输出
Hello world!
\everypar{}
% 由于 \everypar 被重定义为空，因此 "Hello Liam!" 正常输出
Hello Liam!
\bye
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