tuftex-letterspacing-BAD.sty

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

% BAD. This seems to work ok for pdflatex PDF output but it causes
% tex4ebook to crash looking for fonts it can't find. 
% possible fix is to add a nols option and use it when using tex4ebook 
% as the tufte.css handles the letterspacing anyway. 

% dependencies
\RequirePackage{textcase} 
\RequirePackage{letterspace}

% options: none so far 
% TODO add nols

% The original tufte-common.def had lots of junk to do 
% different things depending on xetex, pdflatex, soul... 
% Improved letterspacing of small caps and all-caps text.
%
% First, try to use the `microtype' package, if it's available. 
% Failing that, try to use the `soul' package, if it's available.
% Failing that, well, I give up.

% except the `soul` package breaks things like tex4ht and doesn't
% play nice with ebook so i am going to toss it - DE

\DeclareTextFontCommand{\textsmallcaps}{\scshape}

% textcase provides \MakeTextUppercase and \MakeTextLowercase
%\RequirePackage{textcase} 
\NewDocumentCommand{\allcapsspacing}{m}{not defined!}
\NewDocumentCommand{\smallcapsspacing}{m}{not defined!}
\NewDocumentCommand{\allcaps}{m}{\allcapsspacing{\MakeTextUppercase{#1}}}
\NewDocumentCommand{\smallcaps}{m}{\smallcapsspacing{\MakeTextLowercase{#1}}}

% letterspace fixes the letterspacing duh
%\RequirePackage{letterspace}
\RenewDocumentCommand{\allcapsspacing}{m}{\textls[200]{#1}}
\RenewDocumentCommand{\smallcapsspacing}{m}{\textls[50]{#1}}
\RenewDocumentCommand{\allcaps}{m}{\allcapsspacing{\MakeTextUppercase{#1}}}
\RenewDocumentCommand{\smallcaps}{m}{%
\smallcapsspacing{\scshape\MakeTextLowercase{#1}}
} %\smallcaps
\RenewDocumentCommand{\textsc}{m}{\smallcapsspacing{\textsmallcaps{#1}}}