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% Copyright (c) 2021 Yegor Bugayenko
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\documentclass[12pt]{article}
\usepackage[tt=false,type1=true]{libertine}
\usepackage{amsmath}
\usepackage{multicol}
\usepackage{ffcode}
\usepackage{xcolor}
\title{\ff{ffcode}: \LaTeX{} Package \\ for Fixed-Font Code Blocks}
\author{Yegor Bugayenko}
\date{0.3.0 2021/09/07}
\begin{document}
\pagenumbering{gobble}
\raggedbottom
\setlength{\parindent}{0pt}
\setlength{\columnsep}{32pt}
\setlength{\parskip}{6pt}
\maketitle

This package helps you write source code in your articles
and make sure it looks nice. Install it from CTAN and then
use like this (pay attention to the \ff{\char`\\ff} command
and the \ff{ffcode} environment):

\begin{multicols}{2}
\setlength{\parskip}{0pt}
\scriptsize
\raggedcolumns
\begin{verbatim}
\documentclass{article}
\usepackage{ffcode}
\begin{document}
The function \ff{fibo()} is recursive:
\begin{ffcode}
int fibo(int n) {
  if (n < 2) {
    return n; |$\label{ln:ret}$|
  }
  return fibo(n - 1) + fibo(n - 2);
}
\end{ffcode}
The line~\ref{ln:ret} terminates it.
\end{document}
\end{verbatim}

\columnbreak

The function \ff{fibo()} is recursive:

\begin{ffcode}
int fibo(int n) {
  if (n < 2) {
    return n; |$\label{ln:ret}$|
  }
  return fibo(n - 1) + fibo(n - 2);
}
\end{ffcode}

The line no.~\ref{ln:ret} terminates it.
\end{multicols}

You have to run \ff{pdflatex} with the \ff{--shell-escape} flag
in order to let \ff{minted} (the package we use) to run Pygments
and format the code. If you don't want this to happen,
just use the \ff{nopygments} option.

If you want to omit the light gray frames around \ff{\char`\\ff}
texts, use the package option \ff{noframes}.

To omit the line numbers, use the \ff{nonumbers} option of the package.

By default, the numbering is continuous: line numbers start at the
first snippet and increment until the end of the document. If you
want them to start from one at each snippet, use \ff{nocn}
(stands for ``no continuous numbering'')
option of the package.

You can highlight some lines in your \ff{ffcode} environment,
or can use any other additional configuration parameters from
the \ff{minted} package:

\begin{multicols}{2}
\setlength{\parskip}{0pt}
\scriptsize
\raggedcolumns
\begin{verbatim}
\begin{ffcode*}{highlightlines={1,4-5}}
while (true) {
  print("Hello!")
  print("Enter your name:")
  scan(x)
  print("You name is " + x)
}
\end{ffcode*}
\end{verbatim}

\columnbreak

\begin{ffcode*}{highlightlines={7,10-11}}
while (true) {
  print("Hello!")
  print("Enter your name:")
  scan(x)
  print("You name is " + x)
}
\end{ffcode*}
\end{multicols}

More details about this package you can find
in the \ff{yegor256/ffcode} GitHub repository.

\end{document}