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Bash 示例

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Bash 示例

Bash 示例

# echo ${FOO:-bar}
bar
# FOO=haz; echo ${FOO:-bar}
haz

LaTeX 尝试：

回购：https://github.com/AlecTaylor/latex-env-testcase

命令（在序言中定义）

% Edited from: https://tex.stackexchange.com/a/342447
\def\UNDEFINEDvar{UNDEFINED}
\ifxetex
  \usepackage{catchfile}
  \newcommand\getenv[2][]{%
    \immediate\write18{kpsewhich --var-value #2 > \jobname.tmp}%
    \CatchFileDef{\temp}{\jobname.tmp}{\endlinechar=-1}%
    \ifx\temp\empty\def\temp{\\UNDEFINEDvar}\fi
    \if\relax\detokenize{#1}\relax\temp\else\let#1\temp\fi}
\else
  \ifluatex
    \newcommand\getenv[2][]{%
      \edef\temp{\directlua{tex.sprint(
        kpse.var_value("\luatexluaescapestring{#2}") or "" ) }}%
      \ifx\temp\empty\def\temp{UNDEFINED}\fi
      \if\relax\detokenize{#1}\relax\temp\else\let#1\temp\fi}
  \else
    \usepackage{catchfile}
    \newcommand{\getenv}[2][]{%
      \CatchFileEdef{\temp}{"|kpsewhich --var-value #2"}{\endlinechar=-1}%
      \ifx\temp\empty\def\temp{\UNDEFINEDvar}\fi
      \if\relax\detokenize{#1}\relax\temp\else\let#1\temp\fi}
  \fi
\fi

有条件的（在序言后面）

\ifx \getenv{Introduction}\UNDEFINEDvar
    \def \Introduction{Introduction.draft0}
\else
    \def \Introduction{\getenv{Introduction}}
\fi

使用量（以内\begin{document}）

\input{\Introduction}

不幸的是我得到了这个错误：

(/usr/share/texlive/texmf-dist/tex/latex/tools/.tex)
! TeX capacity exceeded, sorry [input stack size=5000].
\getenv ->\@protected@testopt \getenv 
                                      \\getenv {}
l.300 \input{\Introduction}

编辑：

更改if为：

有条件的（在序言后面）

\getenv[\Introduction]{Introduction}
\ifx \Introduction\UNDEFINEDvar
    \def \Introduction{Introduction.draft0.tex}
\fi

现在我收到此错误：

! LaTeX Error: File `UNDEFINED.tex' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: tex)

Enter file name: 
! Emergency stop.
<read *> 

l.300 \input{\Introduction}
                           ^^M
!  ==> Fatal error occurred, no output PDF file produced!

Latexmk: Missing input file: 'UNDEFINED.tex' from line
  '! LaTeX Error: File `UNDEFINED.tex' not found.'
Latexmk: 'pdflatex': source file 'UNDEFINED.tex' doesn't exist. I'll try making it...

答案1

你不能\getenv这样使用：

\documentclass{article}
\usepackage{ifxetex,ifluatex}

\ifxetex
  \usepackage{catchfile}
  \newcommand\getenv[2][]{%
    \immediate\write18{kpsewhich --var-value #2 > \jobname.tmp}%
    \CatchFileDef{\temp}{\jobname.tmp}{\endlinechar=-1}%
    \ifx\temp\empty\def\temp{UNDEFINED}\fi
    \if\relax\detokenize{#1}\relax\temp\else\let#1\temp\fi}
\else
  \ifluatex
    \newcommand\getenv[2][]{%
      \edef\temp{\directlua{tex.sprint(
        kpse.var_value("\luatexluaescapestring{#2}") or "" ) }}%
      \ifx\temp\empty\def\temp{UNDEFINED}\fi
      \if\relax\detokenize{#1}\relax\temp\else\let#1\temp\fi}
  \else
    \usepackage{catchfile}
    \newcommand{\getenv}[2][]{%
      \CatchFileEdef{\temp}{"|kpsewhich --var-value #2"}{\endlinechar=-1}%
      \ifx\temp\empty\def\temp{UNDEFINED}\fi
      \if\relax\detokenize{#1}\relax\temp\else\let#1\temp\fi}
  \fi
\fi


\getenv[\myvar]{FOO}
\def\UNDEFINEDvar{UNDEFINED}

\ifx \myvar\UNDEFINEDvar
  \def \Introduction{Introduction.draft0}
\else
  \def \Introduction{\myvar}
\fi

\begin{document}

\texttt{\meaning\Introduction}

\end{document}

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