latexbangla, renamed from banglatex (31oct16)

git-svn-id: svn://tug.org/texlive/trunk@42409 c570f23f-e606-0410-a88d-b1316a301751

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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
diff --git a/Master/texmf-dist/doc/latex/latexbangla/latexbangla.pdf b/Master/texmf-dist/doc/latex/latexbangla/latexbangla.pdf
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diff --git a/Master/texmf-dist/doc/latex/latexbangla/latexbangla.tex b/Master/texmf-dist/doc/latex/latexbangla/latexbangla.tex
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+\documentclass[11pt]{article}
+
+\usepackage[banglamainfont=Kalpurush, banglattfont=Siyam Rupali, feature=0, changecounternumbering=0]{latexbangla}
+\usepackage[top=8em, left=10em, right=10em, bottom=8em]{geometry}
+\usepackage{verbatim,spverbatim, hyperref, tcolorbox, hologo, enumerate, amsthm, xpatch, amsfonts, amssymb, amsmath, enumerate, chngcntr, pgffor}
+\hypersetup{hidelinks=yes}
+\tcbuselibrary{breakable}
+
+\def\fileversion{v0.2}
+\def\filedate{31 October, 2016}
+\def\latexbangla{\hologo{LaTeX}\texttt{bangla}}
+\newcommand{\pkn}[1]{\texttt{#1}}
+\addto\captionsbengali{%
+  \renewcommand{\contentsname}{Table of Contents}%
+}
+
+\makeatletter
+%making the word "proof" in proof env. bold and adding a : after it.	
+\xpatchcmd{\proof}{\itshape}{\bfseries}{}{}
+\xpatchcmd{\proof}{\@addpunct{.}}{\@addpunct{:}}{}{}
+\linespread{1.1}	
+\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}\addto\captionsbengali{\renewcommand\proofname{\bfseries প্রমাণ}}
+\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{problem}{\bfseries সমস্যা}
+\renewcommand{\theequation}{\thesection.\tobangla{equation}}
+\renewcommand{\theproblem}{\tobangla{problem}}
+\makeatother
+
+
+
+
+\title{The \latexbangla~Package\\
+Enhanced \LaTeX\ integration for Bangla}
+\author{Adib Hasan\\
+\texttt{adib.hasan8@gmail.com}}
+\date{\filedate\qquad\fileversion}
+
+\begin{document}
+\maketitle
+\tableofcontents
+\pagebreak
+\section{Introduction}
+Including any unicode text in \hologo{LaTeX} has become very simple thanks to the \hologo{XeLaTeX} engine. To do so, the user only has to use the {\tt fontspec} package and load an appropriate font. This is the standard technique for including multiple languages in one document. The {\tt polyglossia} package even facilitates the process for many languages by providing refined controls. Unfortunately, {\tt polyglossia}'s support for Bangla is too limited to produce good quality Bangla documents.
+
+So, I decided to address all the common Bangla typesetting problems in this package, \latexbangla. I have also added useful functionalities to it such as, automated transition between Bangla and English (by exploiting \hologo{XeTeX}'s internal character class feature) and many more.
+\section{How to use}
+\subsection{Sample Code}
+Here is the simplest example for \latexbangla:
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\documentclass{article}
+\usepackage[banglamainfont=Kalpurush, 
+            banglattfont=Siyam Rupali
+           ]{latexbangla}
+\begin{document}
+পিথাগোরাস(Pythagoras)-এর উপপাদ্যটি হল,\\
+\textit{সমকোণী ত্রিভুজের অতিভুজের উপর অঙ্কিত বর্গক্ষেত্রের ক্ষেত্রফল অপর দুই বাহুর 
+উপর অঙ্কিত বর্গক্ষেত্রের ক্ষেত্রফলের সমষ্টির সমান।}\\
+অর্থাৎ কোন সমকোণী ত্রিভুজের অতিভুজ $c$ এবং অপর দুই বাহু $a$ এবং $b$ হলে,
+\[c^2=a^2+b^2\]
+লক্ষ্য করুন, এখন পর্যন্ত টেক্সট প্রদর্শনের জন্য \textbf{কালপুরুষ} ফন্ট ব্যবহৃত হয়েছে।\\
+\texttt{এবার, টেলিটাইপ(Teletype) টেক্সট প্রদর্শনের জন্য \textbf{সিয়াম রূপালী} 
+ফন্ট ব্যবহৃত হল।}\\
+পুনরায় টেক্সট প্রদর্শনের জন্য \textbf{কালপুরুষ} ফন্ট ব্যবহৃত হচ্ছে।
+\end{document}
+\end{verbatim}
+\end{tcolorbox}
+\begin{tcolorbox}[breakable, colback=white]
+পিথাগোরাস(Pythagoras)-এর উপপাদ্যটি হল,\\
+\textit{সমকোণী ত্রিভুজের অতিভুজের উপর অঙ্কিত বর্গক্ষেত্রের ক্ষেত্রফল অপর দুই বাহুর 
+উপর অঙ্কিত বর্গক্ষেত্রের ক্ষেত্রফলের সমষ্টির সমান।}\\
+অর্থাৎ কোন সমকোণী ত্রিভুজের অতিভুজ $c$ এবং অপর দুই বাহু $a$ এবং $b$ হলে,
+\[c^2=a^2+b^2\]
+লক্ষ্য করুন, এখন পর্যন্ত টেক্সট প্রদর্শনের জন্য \textbf{কালপুরুষ} ফন্ট ব্যবহৃত হয়েছে।\\
+\texttt{এবার, টেলিটাইপ(Teletype) টেক্সট প্রদর্শনের জন্য \textbf{সিয়াম রূপালী} 
+ফন্ট ব্যবহৃত হল।}\\
+পুনরায় টেক্সট প্রদর্শনের জন্য \textbf{কালপুরুষ} ফন্ট ব্যবহৃত হচ্ছে।
+\end{tcolorbox}
+As you see, no special command was required to switch language or to use any other facility. With \latexbangla, you don't need to learn a hundred new commands to type Bangla. You simply type normal \hologo{LaTeX} syntax and expect everything to work as it should. 
+
+\latexbangla~does have some limitations, however. (Most of which are due to my lack of time to implement solutions.) So, do take a look at the known issues section.
+\section{Functionalities}
+\subsection{Package options}
+Package options are listed below:\vspace*{2mm}
+\begin{itemize}
+\renewcommand\labelitemi{}
+
+\item\noindent\texttt{banglamainfont}\textbf{(Required)}\\
+Sets the default Bangla font for the document, but does not affect the Latin characters. (They are rendered by the \hologo{LaTeX} default Latin Modern font.) \latexbangla~will automatically fake bold, italic and bolditalic variants for \pkn{banglamainfont} if no font from the appropriate subfamily is found.\\
+
+\item\texttt{banglattfont}\textbf{(Required)}\\
+The default Teletype Bangla font. (Again, Latin characters are rendered by the \hologo{LaTeX} default Latin Modern Teletype.) \latexbangla~will also fake bold, italic and bolditalic variants automatically for this font if no font from the appropriate subfamily is found.\\
+
+\item\texttt{feature}(Optional, default=1)(\texttt{0->none, 1->recommended, 2->full})\\
+To which extent \latexbangla~should enable additional features. For \pkn{feature=1}, the following features will be enabled:
+\begin{enumerate}
+\item the following packages are loaded: \pkn{titlesec, amsthm, xpatch, amsfonts, amssymb, amsmath, enumerate, chngcntr}.
+\item a ``Dot" is added after chapter, section, subsection etc. numbers.
+\item \textit{প্রমাণ.} is replaced by \textbf{প্রমাণ:} in \pkn{proof} environment.
+\item Line height is set to 110\%.
+\item A new command \verb|\tobangla{counter name}| is defined. (See commands subsection for description)
+\item \pkn{example, problem, solution, theorem} environments are defined. The counter associated with \texttt{theorem} environment resets in every section.
+\item The counters associated with \pkn{enumerate, footnote} environments are converted to Bangla.
+\end{enumerate}
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\usepackage[banglamainfont=Kalpurush,
+            banglattfont=Siyam Rupali,
+            ]{latexbangla}
+\begin{document}
+\begin{problem}
+$p$ একটি মৌলিক সংখ্যা এবং $n$ একটি স্বাভাবিক সংখ্যা হলে প্রমাণ কর যে 
+$p|n^p-n$ 
+\end{problem}
+\begin{proof}
+$p|n$ হলে এটি স্বাভাবিকভাবেই সত্যি। অন্যথায়, $\{n,2n,\ldots,(p-1)n\}$
+ একটি পূর্ণাঙ্গ রেসিডিও ক্লাস তৈরি করে। যার ফলে...
+\end{proof}
+\begin{problem}
+$a$ এবং $n$ পরস্পর সহমৌলিক স্বাভাবিক সংখ্যা হলে দেখাও যে $a^{\phi(n)}
+\equiv 1\pmod n$
+\end{problem}
+\end{document}
+\end{verbatim}
+\end{tcolorbox}
+\begin{tcolorbox}[breakable, colback=white]
+\begin{problem}
+$p$ একটি মৌলিক সংখ্যা এবং $n$ একটি স্বাভাবিক সংখ্যা হলে প্রমাণ কর যে $p|n^p-n$ 
+\end{problem}
+\begin{proof}
+$p|n$ হলে এটি স্বাভাবিকভাবেই সত্যি। অন্যথায়, $\{n,2n,\ldots,(p-1)n\}$ একটি
+পূর্ণাঙ্গ রেসিডিও ক্লাস তৈরি করে। যার ফলে...
+\end{proof}
+\begin{problem}
+$a$ এবং $n$ পরস্পর সহমৌলিক স্বাভাবিক সংখ্যা হলে দেখাও যে $a^{\phi(n)}\equiv 1\pmod n$
+\end{problem}
+\end{tcolorbox}
+
+If \pkn{feature} is set to 2, the following additional features will be enabled:
+\begin{enumerate}
+\item \texttt{corollary, property, hint, remarks} environments. The counters of \texttt{corollary} and \texttt{property} environment reset in every section. \pkn{hint} and \pkn{remarks} environments have no counter.
+\item Automated parentheses around equation references, activated by the \pkn{autoref} command of the \pkn{hyperref} package.
+\end{enumerate}
+\item\pkn{changecounternumbering}(Optional, default=1)\\
+The \pkn{polyglossia} package does have an option to convert some important counters (like those of chapters and sections) to Bangla. This option asks whether \latexbangla~should enable that option. By default, it is set to be enabled. You may consider disabling it if your document mostly contains English text.
+\end{itemize}
+\subsection{Commands}
+\begin{itemize}
+\renewcommand\labelitemi\relax
+\item\verb|\tobangla{counter name}|\\
+Converts a counter to Bangla.
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\newcounter{test}
+A new counter `test' is defined.\\
+test is in English: \thetest\\
+\renewcommand{\thetest}{\tobangla{test}}
+test is now in Bangla: \thetest\\
+\stepcounter{test}
+Incrementing test: \thetest\\
+\renewcommand{\thetest}{\arabic{test}}
+test is again in English: \thetest
+\end{verbatim}
+\end{tcolorbox}
+\begin{tcolorbox}[breakable, colback=white]
+\newcounter{test}
+A new counter `test' is defined.\\
+test is in English: \thetest\\
+\renewcommand{\thetest}{\tobangla{test}}
+test is now in Bangla: \thetest\\
+\stepcounter{test}
+Incrementing test: \thetest\\
+\renewcommand{\thetest}{\arabic{test}}
+test is again in English: \thetest
+\end{tcolorbox}
+\item\verb|\numtobangla{number}|\\
+same as \verb|\tobangla|. It converts an English number to Bangla.
+\end{itemize}
+\section{Known Issues}
+You might face the following issues for this (v 0.1) release of \latexbangla. I hope to fix them in the upcoming releases. If you have any question or suggestion, don't hesitate to contact me.
+\begin{enumerate}
+\item You \textit{must} define both {\tt banglamainfont} and {\tt banglattfont} even if you use only one or (possibly) none of them in the document.
+\item A font can't be both {\tt banglamainfont} and {\tt banglattfont} due to limitation in the internal logics. Until I fix it, you can set Kalpurush and SolaimanLipi as your main and tt fonts since they look identical.
+\item The whitespace character in many Bangla fonts is too short for \hologo{LaTeX}. This can't be `fixed', since it is purely a font specific issue. Nevertheless, I have manually reset  relative whitespace lengths for ``Kalpurush'', ``SolaimanLipi'' and ``Siyam Rupali'' (precisely these names without the quotes). So, for the best results, you should consider installing these fonts before using \latexbangla. (Other Bangla fonts \textit{will} work with \latexbangla, but their interword spacings might be unsatisfactory.) My personal choice for main/tt font combination is Kalpurush/Siyam Rupali.
+\item Package \texttt{listings} does not work with Teletype texts.
+\end{enumerate}
+\section{Implementation}
+Because this package depends on \pkn{ucharclasses} (which itself depends on XeTeX's \pkn{interchar classes}).
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\RequirePackage{polyglossia, fontspec, xkeyval, ifxetex}
+\RequireXeTeX
+\end{verbatim}
+\end{tcolorbox}
+The following Bangla fonts are fully supported. (Other Bangla fonts \textit{are} supported, but some issues might arise with whitespaces.
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\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
+}
+\end{verbatim}
+\end{tcolorbox}
+Now declaring options.
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\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
+}
+\end{verbatim}
+\end{tcolorbox}
+Now initialize \pkn{banglamain} and \pkn{banglatt} fonts.
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\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
+\end{verbatim}
+\end{tcolorbox}
+Automating transition between Bangla and English.
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\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
+\end{verbatim}
+\end{tcolorbox}
+Devanagari is required since Bangla fullstop dari ("0964) is in Devanagari block of Unicode
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\RequirePackage[Latin, Bengali, Devanagari]{ucharclasses}
+\setTransitionsForLatin{\begin{latin}}{\end{latin}}
+\end{verbatim}
+\end{tcolorbox}
+if \pkn{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).
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\if@recom
+	\RequirePackage{titlesec, amsthm, xpatch, amsfonts,
+	amssymb, amsmath, enumerate, chngcntr}
+	\titlelabel{\thetitle.\enspace}
+	
+	\xpatchcmd{\proof}{\itshape}{\bfseries}{}{}
+	\xpatchcmd{\proof}{\@addpunct{.}}{\@addpunct{:}}{}{}
+		
+	\counterwithin{equation}{section}
+	
+	\linespread{1.1}
+	
+	\def\@banglanumber#1{\expandafter\@@banglanumber\number#1\@nil}
+	\def\@@banglanumber#1{\ifx#1\@nil\else\char\numexpr#1+"09E6\relax
+	\expandafter\@@banglanumber\fi}
+	\def\banglacounter#1
+	{\expandafter\@banglanumber\csname c@#1\endcsname}
+	\def\banglanumeral#1{\@@banglanumber#1\@nil}
+	
+	\addto\captionsbengali{\renewcommand\proofname{\bfseries প্রমাণ}}
+	\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]
+	\renewcommand{\theequation}{\thesection.\banglacounter{equation}}
+	\renewcommand{\thetheorem}{\thesection.\banglacounter{theorem}}
+	\renewcommand{\theexample}{\banglacounter{example}}
+	\renewcommand{\theproblem}{\banglacounter{problem}}
+	\renewcommand{\theenumi}{\banglacounter{enumi}}
+	\renewcommand{\theenumii}{\banglacounter{enumii}}
+	\renewcommand{\theenumiii}{\banglacounter{enumiii}}
+	\renewcommand{\thefootnote}{\banglacounter{footnote}}
+\fi
+\end{verbatim}
+\end{tcolorbox}
+\pkn{feature=2} enables further modifiations as follows.
+\begin{tcolorbox}[breakable]
+\begin{verbatim}
+\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.\banglacounter{corollary}
+	}
+	\renewcommand{\theproperty}{\thesection.\banglacounter{property}}
+	\addto\captionsbengali
+	{\renewcommand\abstractname{\bfseries সারসংক্ষেপ}}
+	\newenvironment{motive}{\proof[\bfseries মোটিভেশন]}
+	{\phantom\qedhere\endproof}
+	\def\equationautorefname~#1\null{(#1)\null}
+\fi
+\end{verbatim}
+\end{tcolorbox}
+\end{document}