Changes
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At my work, we have to add some sort of revision history to certain documents. This is also an example for the use of \getparameters (see Commands with KeyVal arguments).
A downloadable version of the macro is available here, and a PDF example of the output here.
\useregime[il1] \enableregime[il1] \useencoding[ffr] \definehspace[fr][:][.16667em] \definehspace[fr][;][.16667em] \definehspace[fr][!][.16667em] \definehspace[fr][?][.16667em] \mainlanguage[fr] \newdimen\BigWidth \BigWidth=18cm \setupscreens[screen=0.85] \setupcolors[state=start] \setupheadertexts[Rv.: \the\RevC] \def\Vfil{\vskip0pt plus3fil\relax} \def\In[#1,#2]{\ifx#1\empty\else\in[#1]\fi\if\relax#2\else, \In[#2]\fi} \def\BigTitle{\centerline{\framed[width=\BigWidth,offset=2mm, background=screen]{\bfb\setupinterlinespace\cbox{Title}}}} \def\Auteur{Peter} \def\startChanges{\hbox to \hsize\bgroup\hss\SetTableToWidth{\BigWidth}% \starttable[s1 | c | c | p(95mm) | p(17mm) | p(37mm) |] \HL\BL[5]\AR\VL Rv.\VL Date\VL Origine de la mise jour\VL modifi\VL Auteur\VL\AR\HL} \def\stopChanges{\stoptable\hss\egroup}\newcount\RevC \def\Changes[#1]{% \getgparameters[Changes][Date=,Labels=,#1]% Auteur, Modif, Labels, Date \doifundefined{ChangesAuteur}{\gdef\ChangesAuteur{\Auteur}}% \doifundefined{ChangesModif}{\gdef\ChangesModif{First version}}% \ifnum\RevC=0 \BigTitle \vskip0.5ex \Vfil \startChanges \fi \global\advance\RevC by 1 \VL \the\RevC \VL \ChangesDate \VL \ChangesModif \VL \expandafter\In\expandafter[\ChangesLabels,\relax]\VL \ChangesAuteur \VL\AR\HL} \def\Destinataires#1{\stopChanges\Vfil \def\temp{#1}\ifx\temp\empty\else\noindenting Destinataires:\crlf#1\blank\fi \centerline{\SetTableToWidth{\BigWidth}% \bf\starttable[| c | c | c |] \HL\BL[3]\AR\VL Approbateur\VL Date\VL Visa\VL\AR\HL \VL\vbox to 2cm{}\VL\VL\VL\AR\HL \stoptable}\par\page\completecontent} \starttext \Changes[Date=1/2/2004] \Changes[Date=3/4/2004,Modif=Some modifications,Labels={sec:S1,sec:S2}, Auteur=Jérôme] \Changes[Date=5/6/2004,Modif=Some other modifications,Labels=sec:S2] % \Destinataires{Peter, Olivier} \section[sec:S1]{A section} some text \subsection{Bla} \subsection{Bla} \section[sec:S2]{Another section} some text \stoptext