defRCS$#1: #2 ${expandafterdefcsname RCS#1endcsname{#2}}
RCS$Revision: 1.13 $ % or any RCS keyword
RCS$Date: 2010/04/02 18:20:00 $
...
date{Revision RCSRevision, RCSDate}

hg.id: .hg
    hg log -r'p1()' --template '\def\HgNode{{node|short}}n\def\HgDate{{date|rfc3339date}}n\def\HgAuthor{{author|person}}n' >$@

git diff --color-words

SVN_INFO=svn.info.tex
svninfo:
    $(shell svn info > $(SVN_INFO) )

section{SVN info}
{scriptsize verbatiminput{svn.info.tex}}

IfFileExists{svn.info.tex}
{
    .....
}

DIFF_INFO=diff.info.tex
DIFF_REV=40
diffinfo:
    $(shell svn diff --revision $(DIFF_REV) $(NAME).tex > $(DIFF_INFO) )

IfFileExists{diff.info.tex}
{
    newpage
    begin{landscape}
    section{Diff}
    {scriptsize verbatiminput{diff.info.tex}}
    end{landscape}
}

$ cat .gitattributes
*.tex    diff=tex

defHgNode{2f2q4e1000e9}
defHgDate{2014-02-26T18:00:43+00:00}
defHgStatus{M tex/experiment.tex \
M tex/introduction.tex}

newcommand{hginfo}{%
  ifoptionfinal{}{%
    input{.hginfo}
    {%
      centering % Doesn't center, but skips parindent, for some reason.
      begin{tikzpicture}[every node/.style={draw, dashed, align=left}]
        node (draft) [green, label={[gray]below left:ifdef{HgStatus}{HgStatus}{}}] {HG draft revision: texttt{HgNode/HgDate}};
      end{tikzpicture}
    }
  }
}

usepackage{ifdraft}
usepackage{tikz}
usepackage{includes/hginfo}

% Print fancy HG repository info in draft mode using TikZ and PythonTeX.
newcommand{hginfo}{%
    ifoptionfinal{}{%
        pyc[hg]{import sys; sys.path[-1] += '/scripts'; import hginfo; hg = hginfo.get_hg_info()}
        {%
            centering % Doesn't center, but skips parindent, for some reason.
            begin{tikzpicture}[every node/.style={draw, dashed, align=left}]
                node (draft) [green, label={[gray]below left:{py[hg]{hg['status']}}}] {HG draft revision: texttt{py[hg]{hg['node']}/py[hg]{hg['date']}}};
            end{tikzpicture}
        }
    }
}

usepackage[runall]{pythontex}
usepackage{includes/hginfopy}

hginfo