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% ----------------------------------------------------------------
% LaTeXbangla package - Enhanced LaTeX integration for Bangla
% E-mail: adib.hasan8@gmail.com
% Released under the LaTeX Project Public License v1.3c or later
% See http://www.latex-project.org/lppl.txt
% ----------------------------------------------------------------
% This package simplifies the process of writing Bangla in LaTeX and
% addresses most of the common typesetting issues. Additional features
% include automatic transition between languages and many more. (See
% examples) The user can just type in usual LaTeX syntax and expect
% everything to work as it should.
% ------------------------------------------------------------------
% Copyright (C) 2016 by Adib Hasan adib.hasan8@gmail.com
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License (LPPL), either
% version 1.3c of this license or (at your option) any later
% version. The latest version of this license is in the file:
% http://www.latex-project.org/lppl.txt
% This work is "maintained" (as per LPPL maintenance status) by
% Adib Hasan
% This work consists of the files: latexbangla.sty,
% latexbangla.tex, and
% latexbangla.pdf
%
%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{latexbangla}[2016/10/31 v0.2 Enhanced LaTeX integration for Bangla]
\RequirePackage{polyglossia, fontspec, xkeyval, ifxetex}
% Because this package depends on ucharclasses which itself
% requires XeTeX's interchar classes
\RequireXeTeX
%Fully supported Bangla Fonts
%Other banglafonts *are* supported but there might be issues with whitespaces.
\def\@@Kalpurush{Kalpurush}
\def\@Kalpurush#1{
\ifcase#1{Kalpurush} %name
\or{MatchLowercase} %Scale
\or{1.1} %main WordSpace
\or{1.5} %tt WordSpace
\else\fi
}
\def\@@SiyamRupali{SiyamRupali}
\def\@SiyamRupali#1{
\ifcase#1{SiyamRupali} %name
\or{0.8} %Scale
\or{1.2} %main WordSpace
\or{1.8} %tt WordSpace
\else\fi
}
\def\@@SolaimanLipi{SolaimanLipi}
\def\@SolaimanLipi#1{
\ifcase#1{SolaimanLipi} %name
\or{0.9} %Scale
\or{1.5} %main WordSpace
\or{2.1} %tt WordSpace
\else\fi
}
\DeclareOptionX{banglamainfont}{%
\if\relax\detokenize{#1}\relax
\errmessage{Bangla main font not defined}
\else
\def\bm@name{#1}
\def\bm@@name{bmfont}
\bm@init{\bm@name}
\fi
}
\DeclareOptionX{banglattfont}{%
\if\relax\detokenize{#1}\relax
\errmessage{Bangla tt font not defined}
\else
\def\btt@name{#1}
\def\btt@@name{bttfont}
\btt@init{\btt@name}
\fi
}
\newif\if@none
\newif\if@recom
\newif\if@full
\@recomtrue
\DeclareOptionX{feature}{
\if\relax\detokenize{#1}\relax\fi
\ifcase#1
\@recomfalse
\@nonetrue
\or\or\@fulltrue\fi
}
\newif\ifchange@num
\change@numtrue
\DeclareOptionX{changecounternumbering}{
\if\relax\detokenize{#1}\relax\fi
\ifcase#1\change@numfalse\fi
}
\def\bm@init#1{
\ifx#1\@@Kalpurush
\def\bm@scale{\@Kalpurush{1}}
\def\bm@wordspace{\@Kalpurush{2}}
\else\ifx#1\@@SiyamRupali
\def\bm@scale{\@SiyamRupali{1}}
\def\bm@wordspace{\@SiyamRupali{2}}
\else\ifx#1\@@SolaimanLipi
\def\bm@scale{\@SolaimanLipi{1}}
\def\bm@wordspace{\@SolaimanLipi{2}}
\else
\def\bm@scale{MatchLowercase}
\def\bm@wordspace{1}
\fi\fi\fi
}
\def\btt@init#1{
\ifx#1\@@Kalpurush
\def\btt@scale{\@Kalpurush{1}}
\def\btt@wordspace{\@Kalpurush{3}}
\else\ifx#1\@@SiyamRupali
\def\btt@scale{\@SiyamRupali{1}}
\def\btt@wordspace{\@SiyamRupali{3}}
\else\ifx#1\@@SolaimanLipi
\def\btt@scale{\@SolaimanLipi{1}}
\def\btt@wordspace{\@SolaimanLipi{3}}
\else
\def\btt@scale{MatchLowercase}
\def\btt@wordspace{1.2}
\fi\fi\fi
}
\ProcessOptionsX\relax
%From polyglossia
\ifchange@num
\setmainlanguage[changecounternumbering=true]{bengali}
\else
\setmainlanguage{bengali}
\fi
\newfontfamily\bengalifont[%
Script=Bengali,%
Scale=\bm@scale,%
NFSSFamily=\bm@@name,%
WordSpace=\bm@wordspace,%
AutoFakeSlant,
AutoFakeBold
]{\bm@name}
\newfontfamily\bengalifonttt[%
Script=Bengali,%
Scale=\btt@scale,%
NFSSFamily=\btt@@name,
WordSpace=\btt@wordspace,%
AutoFakeSlant,
AutoFakeBold
]{\btt@name}
\newenvironment{latin}{\fontencoding{OT1}\ifx\f@family\btt@@name\fontfamily{lmtt}\else\fontfamily{lmr}\fi\selectfont}\relax
%Devanagari is required since Bangla fullstop dari ("0964) is in
%Devanagari block of Unicode
\RequirePackage[Latin, Bengali, Devanagari]{ucharclasses}
\setTransitionsForLatin{\begin{latin}}{\end{latin}}
%if feature=0 is provided no other modifications will be enabled
%However, from my personal experience, I find the following modifications to be useful.
%the default for feature option is 1, which enables the recommended modifications
\if@recom
\RequirePackage{titlesec, amsthm, xpatch, amsfonts, amssymb, amsmath, enumerate, chngcntr, hyperref}
%adding a dot after the number in titles
\titlelabel{\thetitle.\enspace}
%making the word "proof" in proof env. bold and adding a : after it.
\xpatchcmd{\proof}{\itshape}{\bfseries}{}{}
\xpatchcmd{\proof}{\@addpunct{.}}{\@addpunct{:}}{}{}
\counterwithin{equation}{section}
\renewcommand\UrlFont{\fontencoding{OT1}\fontfamily{lmtt}\selectfont}
%increases gap between lines
\linespread{1.1}
%defining a \tobangla which converts numbers in any counter to bangla
\def\@banglanumber#1{\expandafter\@@banglanumber\number#1\@nil}
\def\@@banglanumber#1{\ifx#1\@nil
\else\char\numexpr#1+"09E6\relax\expandafter\@@banglanumber\fi}
\def\tobangla#1{\expandafter\@banglanumber\csname c@#1\endcsname}
\def\numtobangla#1{\@@banglanumber#1\@nil}
%Because polyglossia itself defines প্রমাণ as italic. I'm making it bold.
\addto\captionsbengali{\renewcommand\proofname{\bfseries প্রমাণ}}
%a new solution environment
\newenvironment{solution}{\proof[\bfseries সমাধান]}{\endproof}
\newtheoremstyle{custom}% name
{3pt}% space above
{3pt}% space below
{\rm}% body font
{}% indent amount
{\bfseries}% theorem head font
{:}% punctuation after theorem head
{.5em}% space after theorem head
{}% theorem head spec
\theoremstyle{custom}
\newtheorem{example}{\bfseries উদাহরণ}
\newtheorem{problem}{\bfseries সমস্যা}
\newtheorem{theorem}{\bfseries উপপাদ্য}[section]
%converting all the useful counters not handled by polyglossia to bangla
\renewcommand{\theequation}{\thesection.\tobangla{equation}}
\renewcommand{\thetheorem}{\thesection.\tobangla{theorem}}
\renewcommand{\theexample}{\tobangla{example}}
\renewcommand{\theproblem}{\tobangla{problem}}
\renewcommand{\theenumi}{\tobangla{enumi}}
\renewcommand{\theenumii}{\tobangla{enumii}}
\renewcommand{\theenumiii}{\tobangla{enumiii}}
\renewcommand{\thefootnote}{\tobangla{footnote}}
\fi
%feature=2 enabes further modifiations as follows
\if@full
\RequirePackage{titlesec, amsthm, xpatch, amsfonts, amssymb, amsmath, enumerate, chngcntr}
\theoremstyle{custom}
\newtheorem{corollary}{\bfseries অনুসিদ্ধান্ত}[section]
\newtheorem{property}{\bfseries বৈশিষ্ট্য}[section]
\newtheorem*{remark}{\bfseries মন্তব্য}
\newtheorem*{hint} {\bfseries হিন্ট}
\renewcommand{\thecorollary}{\thesection.\tobangla{corollary}}
\renewcommand{\theproperty}{\thesection.\tobangla{property}}
\addto\captionsbengali{\renewcommand\abstractname{\bfseries সারসংক্ষেপ}}
%\addto\captionsbengali{\renewcommand\referencename{\bfseries তথ্যসূত্রসমূহ}}
\newenvironment{motive}{\proof[\bfseries মোটিভেশন]}{\phantom\qedhere\endproof}
\def\equationautorefname~#1\null{(#1)\null}
\fi
\endinput
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