Re: [NTG-context] Code Called Twice?

11 Oct 2013

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I noticed something unexpected with the following code:
\enabletrackers[metapost.showlog]
\startuseMPgraphic{heading:ThemeTitleStyle}
  show "HEADING:THEMETITLESTYLE";
  show \MPstring{heading:title};
draw textext( \MPstring{heading:title} ) rotated 5
    withcolor blue;
\stopuseMPgraphic
\defineframed[ThemeTitleStyle][
  background=\useMPgraphic{ThemeTitleStyle},
]
\def\processword#1{%
  \setMPtext{heading:title}{#1}%
  \useMPgraphic{heading:ThemeTitleStyle}
}
\define[1]\ThemeChapterTitle{\applytosplitstringword\processword{#1}}
\setuphead[chapter][deeptextcommand={\ThemeChapterTitle}]
\starttext
  \startchapter[title=Why Is heading:ThemeTitleStyle Called Twice?]
  \input knuth
  \stopchapter
\stoptext
It appears as though heading:ThemeTitleStyle is being called twice:
...
...
"HEADING:THEMETITLESTYLE"
"Why"
metapost        > info:
metapost        > info:
...
...
"HEADING:THEMETITLESTYLE"
"Why"
I am trying to produce a random number that is not equal to the
previous random number. However, if the code is called twice, then I'd
have to add code to ignore one of the calls.
Any ideas why the code seems to be called twice and what can be done
to ensure that it is only called once?
Don’t use text ;-) That’s a known issue: as soon as your Metapost
code contains text, it will be processed twice. E.g.:

  \starttext
    \setMPtext{heading:title}{foo}
    \startMPcode
      show "This gets printed twice.";
      draw textext( \MPstring{heading:title} );
    \stopMPcode
  \stoptext

Same for labels, {b,e}tex. See also this thread:

  http://www.ntg.nl/pipermail/ntg-context/2011/056047.html

Best regards,
Philipp

Re: [NTG-context] Code Called Twice?

Philipp Gesang