fontbook.sty

\usepackage{pdfpages}
\usepackage[
  inner=2.4cm,
  outer=2.5cm,
  top=2.5cm,
  bottom=2.5cm,
  paperwidth=15.5cm,
  paperheight=22.5cm,
  headheight=0.70cm]{geometry}


\usepackage{fancyhdr}
\usepackage{framed}
\usepackage{url}
\usepackage{graphicx}
\usepackage{color}
\usepackage{fontbook}
\usepackage{fontspec}
\usepackage{xltxtra}
\usepackage{polyglossia}
\usepackage{xcolor}
\usepackage{sectsty}
\usepackage{parskip}
\usepackage{wrapfig}
\usepackage{epigraph}
\usepackage{float}
\setlength\epigraphwidth{8cm}
\usepackage{longtable}

%image path
\graphicspath{ {./Chapters/} }


% Use Malayalam Hyphenation with Polyglossia
\setdefaultlanguage{english}
\setotherlanguage{malayalam}
\setmainfont[Script=Malayalam,HyphenChar="0000]{Rachana}
\newfontfamily\malayalamfonttt{Droid Sans Mono} %Suppress error with \url fixed width fonts
\newfontfamily\englishfont{URW Palladio L}

\usepackage{titlesec}
\titleformat{\chapter}[display]
{\normalfont\bfseries\filcenter\color{cyan}}
{\LARGE\thechapter}
{1ex}
{\titlerule[2pt]
\vspace{2ex}%
\LARGE}
[\vspace{1ex}%
{\titlerule[2pt]}]

\sectionfont{\color{cyan}}  % sets colour of sections
\subsectionfont{\color{cyan}}  % sets colour of sections

% Hindi/Devanagari styles
% TODO: Add more language specific styles - mainly reference fonts
% Malayalam styles
\def\malayalam{\fontspec[Script=Malayalam]{Meera}}
\def\meera{\fontspec[Script=Malayalam]{Meera}}
\def\rachana{\fontspec[Script=Malayalam]{Rachana}}
\def\lohitmalayalam{\fontspec[Script=Malayalam]{Lohit Malayalam}}
\def\raghumalayalam{\fontspec[Script=Malayalam]{RaghuMalayalam}}
\def\hindi{\fontspec[Script=Devanagari]{Lohit Devanagari}}
\def\gujarati{\fontspec[Script=Gujarati]{Lohit Gujarati}}
\def\lohitgujarati{\fontspec[Script=Gujarati]{Lohit Gujarati}}
\newcommand{\HRule}{\rule{\linewidth}{0.5mm}}

\usepackage{setspace}
\newcommand\textexample{\@setfontsize\Huge{32}{48}} 

\pagestyle{fancy}
\fancyhead{}
\fancyfoot{}

\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}

\ProcessOptions\relax

%% Define a new 'leo' style for the package that will use a smaller font.(urls)
\makeatletter
\def\url@leostyle{%
  \@ifundefined{selectfont}{\def\UrlFont{\sf}}{\def\UrlFont{\small\ttfamily}}}
\makeatother
%% Now actually use the newly defined style.
\urlstyle{leo}