banglatex (20oct16)

git-svn-id: svn://tug.org/texlive/trunk@42310 c570f23f-e606-0410-a88d-b1316a301751

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+% ----------------------------------------------------------------
+% BanglaTeX 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 packgage symplifies the process of writing Bangla in LaTeX and
+% addresses most of the common typesetting issues. Additional features
+% include automated 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:  banglatex.sty,
+%                                   banglatex.tex, and
+%                                   banglatex.pdf
+%
+% 
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{banglatex}[2016/10/18 v0.1 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}
+	%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}
+	
+	%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