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获取文件夹中文件数量

tag-icon • tag-icon graphics animate
获取文件夹中文件数量

我正在使用 animate 包，并将要制作动画的 pdf 文件放在单独的文件夹中。我需要输入第一个和最后一个文件的数量，但偶尔会更改要制作动画的文件数量。有没有办法让 LaTex 自动计算文件夹中的文件数量？

下面是一些示例代码，希望能更好地解释我所追求的内容

\documentclass{article}
\usepackage{animate}
%
\begin{document}
\animategraphics[controls]{1}{./pdfFolder/fileName_}{1}{numFiles}
\end{document}

我希望 LaTex 根据“pdfFolder”中的文件数量自动更新“numFiles”。

预先感谢您的帮助！

答案1

纯 LaTeX：（fileName_1.pdf ... fileName_?.pdf）

\documentclass{article}
\usepackage{animate}
\usepackage{graphicx}

\newcounter{NumFiles}
%\setcounter{NumFiles}{-1} % fileName_0.pdf ... fileName_?.pdf

\newboolean{stop}
\whiledo{\NOT\boolean{stop}}{
  \stepcounter{NumFiles}
  \IfFileExists{./pdfFolder/fileName_\theNumFiles.pdf}{}{
    \addtocounter{NumFiles}{-1}
    \setboolean{stop}{true}
  }
}

\begin{document}
  \animategraphics[controls]{1}{./pdfFolder/fileName_}{1}{\theNumFiles}
\end{document}

答案2

这是一种使用基本 Unix 命令和的方法\write18{}，首先列出内容然后使用wc -l命令，将输出保存到 dummyvar.tex 并将该文件读入\numFiles宏。

当然，shell 脚本应该更加安全，即将其存储在单独的文件中，而不是countmyfiles.sh在其中获取该文件\write18{source countmyfiles.sh}。

\documentclass{article}

\usepackage{animate}


\def\numFiles{-1}

\newread\numfileshandle
\begin{document}
\write18{rm -f dummyvar.tex ; ls -l pdfFolder/fileName_* | wc -l > ./dummyvar.tex}
\immediate\openin\numfileshandle=dummyvar.tex
\read\numfileshandle to \numFiles
\immediate\closein\numfileshandle

There are \numFiles Files

%\animategraphics[controls]{1}{./pdfFolder/fileName_}{1}{\numFiles}
\end{document}

使用我的虚拟文件夹 pdfFolder 中的 20 个虚拟文件进行测试，得到 20 个输出。

答案3

Christian 拒绝了我关于使用管道输入功能的建议，但我仍然认为展示一下在这种情况下如何使用它可能会很有趣。请注意宏的参数\countfiles是如何预处理的，以便允许使用“特殊”字符，如 _和均衡{和 的出现}，同时允许宏（或更一般地，可扩展的控制序列）进行扩展，如下所示的\myDirName和\jobname。

% My standard header for TeX.SX answers:
\documentclass[a4paper]{article} % To avoid confusion, let us explicitly 
                                 % declare the paper format.

\usepackage[T1]{fontenc}         % Not always necessary, but recommended.
% End of standard header.  What follows pertains to the problem at hand.

\newcounter{numberOfFiles}

\makeatletter

% Beware: "special" characters like "_" that appear in the directory name must
% be either re-"\catcode"d or "\detokenize"d: the latter method is **much**
% simpler than the former, but it does **not** cope with filenames containing
% the "%" character, or unbalanced "{" and "}" characters, and in addition it
% requires e-TeX extensions (not at all a concern, these days!).
\newcommand*{\countfiles}[1]{%
    \begingroup
        \protected@edef\@tempa{#1}% before detokenizing, expand expandable (and 
                                  % unprotected) tokens
        % We use "\@inputcheck" for the temporary input pipe:
        \openin\@inputcheck "|ls -1 % the last character is the digit "one"
                \expandafter\detokenize\expandafter{\@tempa} % space meant
                |wc -l% the last character is the letter "ell"
                "\relax % without the "\relax", the ensuing "\ifeof" would be 
                        % prematurely expanded
        \ifeof\@inputcheck
            % An error message could be triggered here.
            \typeout{WARNING: Could not read \protect\numFiles!}%
        \else
            \endlinechar \m@ne % cf. exercise 20.18
            \readline\@inputcheck to\@tempa
            \setcounter{numberOfFiles}{\@tempa}%
        \fi
        \closein\@inputcheck % note: no "\immediate" needed for "\closein"
    \endgroup
}

\makeatother

\newcommand*{\myDirName}{some_directory}



\begin{document}

\setcounter{numberOfFiles}{-1}\countfiles{\myDirName}
There are \arabic{numberOfFiles} files in the specified directory.

\bigbreak

\setcounter{numberOfFiles}{-1}
In the current directory there are:
\begin{tabbing}
    \quad 999\=\kill
    \countfiles{\jobname.*}\>\arabic{numberOfFiles}\'
            file(s) whose basename is \texttt{\jobname};\\
    \countfiles{*.{tex,log}}\>\arabic{numberOfFiles}\'
            file(s) whose extension is either \texttt{.tex} or \texttt{.log};\\
    \countfiles{[A-Za-z]*.tex}\>\arabic{numberOfFiles}\'
            file(s) whose name consists only of letters, followed by the 
            extension \texttt{.tex}.
\end{tabbing}
That's all, folks!

\end{document}

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