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Imagine that I want to use \\ to end a line and start a new one (can't just insert a blank line due to a macro argument and also can't change it into \par).
That is not purely imaginative, it is actually the case I am in.
My question is: how can I indent every line after \\?
\parindent does the job for \par, now doesn't it?
Is it possible for \\ as well?
If you process
\documentclass{article}
\newcommand*\zzz[1]{#1}%does not allow paragraphs
\begin{document}
\zzz{aaa\endgraf bbb} % two paragraphs
\zzz{aaa
bbb}
\end{document}
then you get the error below as \zzz does not allow normal paragraph breaks. If you replace the blank line (\par) by \endgraf as in the first example then it works.
\\ in normal text does not end a paragraph so will never trigger \parskip space or paragraph indentation.
{aaa
! Paragraph ended before \zzz was complete.
<to be read again>
\par
l.10
?
\\it simply does not work,\\does not end a paragraph, it's like asking to end the paragraph with\mbox{}Also you should almost never need\parin a document as a blank line ends a paragraph. If you are in a macro argument that doesn't allow\paruse\endgraf\endgrafsolved the problem. Let me rephrase the question a bit to make it a bit more sensible again then.