latexdiff我在使用（版本 1.3.1.1）时遇到问题。
我有一个 Old.tex
%% Old.tex %%%%
\documentclass[a4paper,%
11pt%
%twoside,%
]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian,english]{babel}
\usepackage{amsmath,amssymb,amsthm}
\usepackage[dvipsnames]{xcolor}
\usepackage{hyperref}
% Page layout
\renewcommand{\baselinestretch}{1.2}\normalsize
%%%%%%%%%%%%%%%%%%%%%%%%
%number equations after the sections
\renewcommand{\theequation}{\thesection.\arabic{equation}}
\numberwithin{equation}{section}
%% counter footnote
\renewcommand{\thefootnote}{\alph{footnote}}
\input{InitialFinalMaterial/settings}
\begin{document}
\begin{titlepage}
\thispagestyle{plain} %
\begin{center}
{ \textbf{%\vspace{-3cm}\\
\fontsize{13.2}{15}\selectfont\mbox{\hspace{-0cm}PROVA DIFF}}}
\vspace{.8cm}
{\scshape{Mario Rossi}}
\vspace{.15cm}
\textit{Dipartimento di Filosofia}\\
\vspace{.9cm}
\textbf{Abstract}
\end{center}
{\fontsize{10}{12.25}\selectfont\noindent Lorem ipsum}
\end{titlepage}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%******************************************************************
% Principal material
%******************************************************************
\input{Paragraph/Old1}
\end{document}
和一个 New.tex
%% New.tex %%%%
\documentclass[a4paper,%
11pt%
%twoside,%
]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian,english]{babel}
\usepackage{amsmath,amssymb,amsthm}
\usepackage[dvipsnames]{xcolor}
\usepackage{hyperref}
% Page layout
\renewcommand{\baselinestretch}{1.2}\normalsize
%%%%%%%%%%%%%%%%%%%%%%%%
%number equations after the sections
\renewcommand{\theequation}{\thesection.\arabic{equation}}
\numberwithin{equation}{section}
%% counter footnote
\renewcommand{\thefootnote}{\alph{footnote}}
\input{InitialFinalMaterial/settings}
\begin{document}
\begin{titlepage}
\thispagestyle{plain} %
\begin{center}
{ \textbf{%\vspace{-3cm}\\
\fontsize{13.2}{15}\selectfont\mbox{\hspace{-0cm}PROVA DIFF Latex}}}
\vspace{.8cm}
{\scshape{Mario Bianchi}}
\vspace{.15cm}
\textit{Dipartimento di Filosofia e Storia}\\
\vspace{.9cm}
\textbf{Abstract}
\end{center}
{\fontsize{10}{12.25}\selectfont\noindent Lorem dolor}
\end{titlepage}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%******************************************************************
% Principal material
%******************************************************************
\input{Paragraph/Old1} %% MODIFIED from the corresponding “Old.tex” file
\end{document}
现在，如果我首先使用命令进入新版本的文件夹
cd /Users/Andrea/Desktop/Latexdiff/EsempioR/New，然后发出latexdiff
latexdiff /Users/Andrea/Desktop/Latexdiff/EsempioR/Old/Old.tex
New.tex > diffs.tex
最后编译 diffs.tex
%%%% diffs.tex %%%%%
\documentclass[a4paper,%
%DIF LATEXDIFF DIFFERENCE FILE
%DIF DEL /Users/Andrea/Desktop/Latexdiff/EsempioR/Old/Old.tex Tue Jan 12 15:16:54 2021
%DIF ADD New.tex Tue Jan 12 15:22:59 2021
11pt% oneside%
%twoside,% % fronte-retro
]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian,english]{babel}
\usepackage{amsmath,amssymb,amsthm} % matematica
\usepackage[dvipsnames]{xcolor} % colori
\usepackage{hyperref} % collegamenti ipertestuali
%\usepackage[colorlinks]{hyperref} % Per colorare parti di testo
% Page layout
\renewcommand{\baselinestretch}{1.2}\normalsize
%%%%%%%%%%%%%%%%%%%%%%%%
%number equations after the sections
\renewcommand{\theequation}{\thesection.\arabic{equation}}
\numberwithin{equation}{section}
%% counter footnote
\renewcommand{\thefootnote}{\alph{footnote}}
\input{InitialFinalMaterial/settings}
%DIF PREAMBLE EXTENSION ADDED BY LATEXDIFF
%DIF UNDERLINE PREAMBLE %DIF PREAMBLE
\RequirePackage[normalem]{ulem} %DIF PREAMBLE
\RequirePackage{color}\definecolor{RED}{rgb}{1,0,0}\definecolor{BLUE}{rgb}{0,0,1} %DIF PREAMBLE
\providecommand{\DIFaddtex}[1]{{\protect\color{blue}\uwave{#1}}} %DIF PREAMBLE
\providecommand{\DIFdeltex}[1]{{\protect\color{red}\sout{#1}}} %DIF PREAMBLE
%DIF SAFE PREAMBLE %DIF PREAMBLE
\providecommand{\DIFaddbegin}{} %DIF PREAMBLE
\providecommand{\DIFaddend}{} %DIF PREAMBLE
\providecommand{\DIFdelbegin}{} %DIF PREAMBLE
\providecommand{\DIFdelend}{} %DIF PREAMBLE
\providecommand{\DIFmodbegin}{} %DIF PREAMBLE
\providecommand{\DIFmodend}{} %DIF PREAMBLE
%DIF FLOATSAFE PREAMBLE %DIF PREAMBLE
\providecommand{\DIFaddFL}[1]{\DIFadd{#1}} %DIF PREAMBLE
\providecommand{\DIFdelFL}[1]{\DIFdel{#1}} %DIF PREAMBLE
\providecommand{\DIFaddbeginFL}{} %DIF PREAMBLE
\providecommand{\DIFaddendFL}{} %DIF PREAMBLE
\providecommand{\DIFdelbeginFL}{} %DIF PREAMBLE
\providecommand{\DIFdelendFL}{} %DIF PREAMBLE
%DIF HYPERREF PREAMBLE %DIF PREAMBLE
\providecommand{\DIFadd}[1]{\texorpdfstring{\DIFaddtex{#1}}{#1}} %DIF PREAMBLE
\providecommand{\DIFdel}[1]{\texorpdfstring{\DIFdeltex{#1}}{}} %DIF PREAMBLE
%DIF LISTINGS PREAMBLE %DIF PREAMBLE
\RequirePackage{listings} %DIF PREAMBLE
\RequirePackage{color} %DIF PREAMBLE
\lstdefinelanguage{DIFcode}{ %DIF PREAMBLE
%DIF DIFCODE_UNDERLINE %DIF PREAMBLE
moredelim=[il][\color{red}\sout]{\%DIF\ <\ }, %DIF PREAMBLE
moredelim=[il][\color{blue}\uwave]{\%DIF\ >\ } %DIF PREAMBLE
} %DIF PREAMBLE
\lstdefinestyle{DIFverbatimstyle}{ %DIF PREAMBLE
language=DIFcode, %DIF PREAMBLE
basicstyle=\ttfamily, %DIF PREAMBLE
columns=fullflexible, %DIF PREAMBLE
keepspaces=true %DIF PREAMBLE
} %DIF PREAMBLE
\lstnewenvironment{DIFverbatim}{\lstset{style=DIFverbatimstyle}}{} %DIF PREAMBLE
\lstnewenvironment{DIFverbatim*}{\lstset{style=DIFverbatimstyle,showspaces=true}}{} %DIF PREAMBLE
%DIF END PREAMBLE EXTENSION ADDED BY LATEXDIFF
\begin{document}
\begin{titlepage}
\thispagestyle{plain} %
\begin{center}
{ \textbf{%\vspace{-3cm}\\
\fontsize{13.2}{15}\selectfont\DIFdelbegin \DIFdel{\mbox{\hspace{-0cm}PROVA DIFF}}\DIFdelend \DIFaddbegin \DIFadd{\mbox{\hspace{-0cm}PROVA DIFF Latex}}\DIFaddend }}
\vspace{.8cm}
{\DIFdelbegin %DIFDELCMD < \scshape{Mario Rossi}%%%
\DIFdelend \DIFaddbegin \scshape{Mario Bianchi}\DIFaddend }
\vspace{.15cm}
\textit{Dipartimento di Filosofia \DIFaddbegin \DIFadd{e Storia}\DIFaddend }\\
\vspace{.9cm}
\textbf{Abstract}
\end{center}
{\fontsize{10}{12.25}\selectfont\noindent Lorem \DIFdelbegin \DIFdel{ipsum}\DIFdelend \DIFaddbegin \DIFadd{dolor}\DIFaddend }
\end{titlepage}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%DIF < %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%DIF < %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%******************************************************************
%DIF < Initial Material
%DIF < ******************************************************************
\DIFdelbegin %DIFDELCMD <
%DIFDELCMD < %%%
%DIF < ******************************************************************
\DIFdelend % Principal material
%******************************************************************
\input{Paragraph/Old1} %DIF > % MODIFICATO rispetto al corrispettivo Old.tex
\end{document}
差异被很好地突出显示，但嵌套文件 Old1.tex 中包含的差异没有突出显示。我还尝试了以下flatten选项，即
latexdiff ‐‐flatten /Users/Andrea/Desktop/Latexdiff/EsempioR/Old/Old.tex
New.tex > diffs.tex
但它返回以下错误：
2 and only 2 non-option arguments required. Write latexdiff -h to get help
您有没有什么解决方案可以在突出显示 Old.tex 和 New.tex 之间的差异时包含嵌套文件 Old1.tex？
根据 frederik 的提示进行编辑（参见下面的评论）
我将\input{Paragraph/Old1}New.tex 重命名为\input{Paragraph/New1}。然后我发出以下命令：
cd /Users/Andrea/Desktop/Latexdiff/EsempioR/Old latexdiff --preamble=/dev/null --flatten Old.tex Old.tex > Old-flattened.tex
cd /Users/Andrea/Desktop/Latexdiff/EsempioR/New latexdiff --preamble=/dev/null --flatten New.tex New.tex > New-flattened.tex
latexdiff -t UNDERLINE /Users/Andrea/Desktop/Latexdiff/EsempioR/Old/Old-flattened.tex New-flattened.tex > diffs-flattened.tex
diffs-flattened.pdf 文件是正确的，但是在编译 diffs-flattened.tex 时我遇到了以下两个错误
Package Listings Error: Environment DIFverbatim already defined：
Package Listings Error: Environment DIFverbatim* already defined
我该如何解决它们？