tuftex-letterpaper.sty

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{tufte2-letterpaper}[2023-06-20 package tuftex-letterpaper]

% preliminary declarations
% set page size and margins for letter only
\RequirePackage[letterpaper,left=1in,top=1in,headsep=2\baselineskip,textwidth=26pc,marginparsep=2pc,marginparwidth=12pc,textheight=44\baselineskip,headheight=\baselineskip]{geometry}
\RequirePackage{ragged2e}

% package options - nope not implementing them!

% package declarations
% Set some margin lengths, from tufte-common.def
\setlength\leftmargini   {1pc}
\setlength\leftmarginii  {1pc}
\setlength\leftmarginiii {1pc}
\setlength\leftmarginiv  {1pc}
\setlength\leftmarginv   {1pc}
\setlength\leftmarginvi  {1pc}
\setlength\labelsep      {.5pc}
\setlength\labelwidth    {\leftmargini}
\addtolength\labelwidth{-\labelsep}

% \RaggedRight allows hyphenation, from tufte-common.def
\setlength{\parindent}{1.0pc}%
\setlength{\parskip}{0pt}%
\setlength{\RaggedRightRightskip}{\z@ plus 0.08\hsize}

% adapted from tufte-common.def
\NewDocumentCommand{\@tuftex@ResetPar}{}{%
  \setlength{\RaggedRightParindent}{1.0pc}%
  \setlength{\JustifyingParindent}{1.0pc}%
  \setlength{\parindent}{1pc}%
  \setlength{\parskip}{0pt}%
} %\@tuftex@ResetPar
\@tuftex@ResetPar

% Paragraph indentation and separation for marginal text
% adapted from tufte-common.def
\NewDocumentCommand{\@tuftex@MarginPar}{}{%
  \setlength{\RaggedRightParindent}{0.5pc}%
  \setlength{\JustifyingParindent}{0.5pc}%
  %\setlength{\parindent}{0.5pc}%
  \setlength{\parindent}{0pt}%
  \setlength{\parskip}{0pt}%
} %\@tuftex@MarginPar

% do it!
\RaggedRight