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+%% \CheckSum{11}
+% \iffalse
+% File: centerlastline.dtx
+% Copyright (C) 2020 Miguel V. S. Frasson (mvsfrasson@gmail.com)
+%
+% This package may be distributed under the terms of the LaTeX
+% Project Public License, as described in lppl.txt in the base
+% LaTeX distribution, either version 1.2 or (at your option)
+% any later version.
+%
+%<*driver>
+\documentclass{ltxdoc}
+\usepackage{doc}
+\usepackage[T1]{fontenc}
+\usepackage{xcolor,lipsum,centerlastline,microtype}
+%\usepackage[margin=1.6in]{geometry}
+\begin{document}
+ \DocInput{centerlastline.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% \StopEventually
+%
+% \changes{1.0}{2020/10/12}{Initial version}
+%
+% \MakeShortVerb+
+%
+% \title{\textsf{centerlastline}: last line centered}
+% \author{Miguel V.\ S.\ Frasson\\(\texttt{mvsfrasson@gmail.com})}
+% \date{2020, oct. 12}
+%
+% \maketitle
+%
+% This package provides command +\centerlastline+, which sets
+% paragraph style\footnote{Paragraph style like
+% \texttt{\string\centering}, \texttt{\string\raggedright} or
+% \texttt{\string\raggedleft}.} to typeset with no indentation and
+% last line centered, an arrangement known as \emph{spanish
+% paragraph}. It is a not-so-frequent composition, useful to finish a
+% large paragraph of text, at the end of chapters, prologues, back
+% cover of books, etc. It can be used as an environment
+% +centerlastline+.
+%
+% In command form +\centerlastline+, user must take care that the text
+% ends with a new paragraph (either a blank line or a +\par+), to
+% ensure that the paragraph style +\centerlastline+ is active at the
+% end of the paragraph. In environment form, this is automatic.
+%
+% Below an example of
+% such paragraph\ldots\bigskip
+%
+% \begin{centerlastline}
+% \color{blue}\lipsum[1]
+% \end{centerlastline}\bigskip
+%
+% \noindent \ldots{} produced with\bigskip
+%
+% \noindent
+% +\begin{centerlastline}+\\
+% + \color{blue}\lipsum[1]+\\
+% +\end{centerlastline}+\medskip
+%
+% \noindent or\medskip
+%
+% \noindent +{\centerlastline+\\+ \color{blue}\lipsum[1]\par}+
+%
+% \clearpage
+% \section*{Code}
+%
+% Identidication of the package.
+% \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{centerlastline}[2020/10/12 v1.0 Last line centered (spanish par.)]
+% \end{macrocode}
+%
+% \DescribeMacro{\centerlastline}
+% Implementation of +\centerlastline+ based on +\centerlastline+ from
+% ``memoir'' class. Definition with +\providecommand+ to avoid error
+% if loaded with ``memoir'' class.
+% \begin{macrocode}
+\providecommand{\centerlastline}{%
+ \parindent=0pt
+ \leftskip=0pt plus 1fil
+ \rightskip=0pt plus -1fil
+ \parfillskip=0pt plus 2fil}
+% \end{macrocode}
+%
+% Ending enviromnment with +\par+ to ensure paragraph style keeps
+% effect until last paragraph.
+% \begin{macrocode}
+\def\endcenterlastline{\par}
+% \end{macrocode}
+% \Finale
+%
+\endinput
+%
+%% \CharacterTable
+%% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%% Digits \0\1\2\3\4\5\6\7\8\9
+%% Exclamation \! Double quote \" Hash (number) \#
+%% Dollar \$ Percent \% Ampersand \&
+%% Acute accent \' Left paren \( Right paren \)
+%% Asterisk \* Plus \+ Comma \,
+%% Minus \- Point \. Solidus \/
+%% Colon \: Semicolon \; Less than \<
+%% Equals \= Greater than \> Question mark \?
+%% Commercial at \@ Left bracket \[ Backslash \\
+%% Right bracket \] Circumflex \^ Underscore \_
+%% Grave accent \` Left brace \{ Vertical bar \|
+%% Right brace \} Tilde \~}