Make LaTeX git-aware

gitparse.tex

% A few example commands for a more git-aware LaTeX.
% Note that this requires you to run pdflatex/xelatex/etc. with the
% `--shell-escape' option which is extremely unsafe. Use with care
% and *never* use with plain TeX.

% Print the short-hash of the current commit
\newcommand*{\gitrev}{%
  \immediate\write18{%
    rm gitrev.tex 2> /dev/null; git rev-parse --short HEAD > gitrev.tex
  }%
  \InputIfFileExists{gitrev.tex}{}{}\unskip%
  \immediate\write18{%
    rm gitrev.tex 2> /dev/null
  }%
}

% Print `*' if the index is dirty
\newcommand*{\gitdirty}{%
  \immediate\write18{%
    rm gitdirty.tex 2> /dev/null; git diff-files --quiet || echo "*" > gitdirty.tex
  }%
  \InputIfFileExists{gitdirty.tex}{\endlinechar=-1\relax}{}\unskip%
  \immediate\write18{%
    rm gitdirty.tex 2> /dev/null
  }%
}

% Print `+' if there are uncommitted files in the index
\newcommand*{\gituncommitted}{%
  \immediate\write18{%
    rm gituncommitted.tex 2> /dev/null; git diff-index --quiet --cached HEAD || echo "+" > gituncommitted.tex
  }%
  \InputIfFileExists{gituncommitted.tex}{\endlinechar=-1\relax}{}\unskip%
  \immediate\write18{%
    rm gituncommitted.tex 2> /dev/null
  }%
}