thaixelatex.sty

\ProvidesPackage{thaixelatex}

\DeclareOption{english}{\englishtrue}

% Package options:
%
%   english: set English as primary language
%
\newif\ifenglish\englishfalse

\ProcessOptions

%% font setup
\RequirePackage{fontspec}
\defaultfontfeatures{Mapping=tex-text}

%% Thai language setup
\XeTeXlinebreaklocale 'th_TH'
\XeTeXlinebreakskip = 0pt plus 0.2pt minus 0.2pt

\newfontfamily\thaifont[
  Script=Thai,
  Scale=MatchLowercase,
  Extension=.otf,
  ItalicFont=*-Italic,
  BoldFont=*-Bold,
  BoldItalicFont=*-BoldItalic,
%   FakeBold=1.5,
]{Laksaman}
\newfontfamily\thaifonttt[
%  Script=Thai,
  Scale=MatchLowercase,
  FakeBold=2,
]{Arundina Sans Mono}
\ifenglish
  \setmainfont{TeX Gyre Termes}
  \setmonofont[
    Mapping=,
    Scale=MatchLowercase,
    Extension=.otf,
    UprightFont=*zi4-Regular,
    BoldFont=*zi4-Bold,
    AutoFakeSlant
  ]{Inconsolata}
\else
  \newfontfamily\engfont{TeX Gyre Termes}
  \newfontfamily\engfonttt[
    Mapping=,
    Scale=MatchLowercase,
    Extension=.otf,
    UprightFont=*zi4-Regular,
    BoldFont=*zi4-Bold,
    AutoFakeSlant
  ]{Inconsolata}
\fi

%% math setup
\RequirePackage{amsmath}
\RequirePackage{unicode-math}
\setmathfont{TeX Gyre Termes Math}
\setmathfontface\mathrm{TeX Gyre Termes}
\setmathfontface\mathbf{TeX Gyre Termes Bold}
\setmathfontface\mathit{TeX Gyre Termes Italic}

\RequirePackage{ifthen}
\ifenglish
\newenvironment{thailang}{%
% \hyphenrules{thai}%
\ifthenelse{\equal{\f@family}{\ttdefault}}{\thaifonttt}{\thaifont}%
}
{}
\else
\newenvironment{englang}{%
% \hyphenrules{english}%
\ifthenelse{\equal{\f@family}{ArundinaSansMono(0)}}{\engfonttt}{\engfont}%
}
{}
\fi

\RequirePackage[Latin,Thai]{ucharclasses}
\ifenglish
  \setTransitionsFor{Thai}{\begin{thailang}}{\end{thailang}}
\else
  \setTransitionsForLatin{\begin{englang}}{\end{englang}}
\fi

\RequirePackage{polyglossia}
\ifenglish
  \setdefaultlanguage{english}
  \setotherlanguage{thai}
\else
  \setdefaultlanguage{thai}
  \setotherlanguage{english}
  \frenchspacing
\fi

%% spacing
\RequirePackage{setspace}
\ifenglish
\else
\setstretch{1.35}
\fi