Special format for chapter title

Question

I want to format my chapter title for example:

"Chapter one: Introduction"

I have a new command defined as the following:

\documentclass[a4paper,12pt] {report}
\usepackage{thesis_packages}

\newcommand{\ch}[2]{ 
\setcounter{chapter}{#1}
\setcounter{section}{0}
\chapter*{#2}}

\begin{document}

\include{introduction}
\end{document}


% introduction.tex
\ch{1}{Chapter One: Introduction}   \label{ch:intro}

For that, I need to write \ch{1}{Chapter One:intro} in the introduction.tex file. However,I receive an error says "undefined control sequence \ch{1}{Chapter One:intro}". The new command is defined in the main text file. I use report documentclass.

Answer 1

\documentclass[a4paper,12pt]{report}

\makeatletter
\newcommand{\inletters}[1]{\ifcase \csname c@#1\endcsname
  zero\or one\or two\or three\or four\or five\or six\or seven\or
  eight\or nine\or ten %complete here if you have more than 10 chapters 
  \else ??\fi} 

\renewcommand{\@makechapterhead}[1]{\vspace*{50\p@}%
  {\parindent\z@ \raggedright \normalfont\Huge\bfseries
    \ifnum \c@secnumdepth>\m@ne \@chapapp~\inletters{chapter}: \fi
     #1\par\nobreak\vskip 40\p@}}

\def\@chapter[#1]#2{\ifnum \c@secnumdepth >\m@ne
    \refstepcounter{chapter}%
    \typeout{\@chapapp\space\thechapter.}%
    \addcontentsline{toc}{chapter}%
    {\@chapapp~\inletters{chapter}: #1}% <-- modification
  \else
    \addcontentsline{toc}{chapter}{#1}%
  \fi
  \chaptermark{#1}%
  \addtocontents{lof}{\protect\addvspace{10\p@}}%
  \addtocontents{lot}{\protect\addvspace{10\p@}}%
  \if@twocolumn
    \@topnewpage[\@makechapterhead{#2}]%
  \else
    \@makechapterhead{#2}%
    \@afterheading
  \fi}
\makeatother


\begin{document}

\chapter{Introduction}

In this chapter, ...

\section{First section}

\end{document}

Answer 2

The new command \ch seems to be unnecessary. To do what you want automatically, there are two things you need.

First, you need to print the chapter number in words instead of the usual numerals. To do this, load the fmtcount package. This will provide you with \numberstring and \Numberstring commands (for lowercase and capitalized respectively) to print the current value of a counter in words.

\usepackage{fmtcount}

Second, you need to slightly change the format of the chapter headings to put it all on one line. I expect there's a package for this purpose out there, but it's quite easy to do it by redefining \@makechapterhead yourself:

\makeatletter
\renewcommand{\@makechapterhead}[1]{\vspace *{50\p@ }{\parindent \z@ 
\raggedright \normalfont \ifnum \c@secnumdepth >\m@ne \Huge \bfseries 
\@chapapp \space \Numberstring{chapter} : \fi #1\par \nobreak \vskip 40\p@ }}
\makeatother

Then in the body of the document, you can use the \chapter command normally:

\chapter{First Chapter}

This is Chapter One.

Answer 3

You simply can use the tools from titlesec which make formatting of section titles easy. What you want is the block style:

\documentclass[a4paper,12pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fourier}
\usepackage{geometry} 
\usepackage[letterspace=30]{microtype}
\usepackage{fmtcount}
\usepackage{titlesec}
\titleformat{\chapter}[block]{\Huge\bfseries\lsstyle}{\chaptername~\Numberstring{chapter}:}{0.333em}{}

\begin{document}

\chapter{Introduction}

In this chapter, ...

\end{document} 

To have the same (almost ;o)) in the table of contents, you can use \titletoc. As it gives access to the string \thecontentslabel, you have to convert this string to a number before you can use the fmtcount commands. This is done with one of the commands ending in num (\Numberstringnum, \numberstringnum, &c.):

\documentclass[a4paper,12pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fourier}
\usepackage{geometry}
\usepackage[letterspace=30]{microtype}
\usepackage{fmtcount}
\usepackage{titlesec, titletoc}
\titleformat{\chapter}[block]{\Huge\bfseries\lsstyle}{\chaptername~\Numberstring{chapter}:}{0.333em}{}

\titlecontents{chapter} [0em]{\bfseries} {\chaptername~the~Ordinalstringnum{\thecontentslabel}:\quad} 
{}{\hfill\contentspage} 

\begin{document}

\tableofcontents
\chapter{Introduction}

In this chapter, ...

\end{document} 

Answer 4

For reference/just for fun, here is how you can accomplish this in ConTeXt.

\setuphead
  [chapter]
  [conversion=Word,
   numbercommand=\NUMBERCOMMAND,
   style=\bfd]
\define[1] \NUMBERCOMMAND
  {Chapter #1:}

\starttext
  \chapter{Introduction}
  In this chapter, \periods
\stoptext