The following worked without a hitch:
\def\IsNilReturn#1{\edef\tmp{#1}\doifelse{\tmp}{nil}{\color[red]{ERROR}}{\tmp}}
\def\formatDuration#1{\ctxlua{
local s = string.gsub("#1","\%D","")
local d = tostring(hvdm.time:match(s))
tex.print(string.sub(d,1,2) ~= "0:" and d or string.sub(d,3))
}}
\def\FormatDuration#1{\IsNilReturn{\formatDuration{#1}}}
Called by something like \FormatDuration{11929} (meaning: 1 hour 19 minutes 29
seconds)
Now I get an error in
ConTeXt ver: 2013.01.27 21:24 MKIV fmt: 2013.1.28 int: english/english
! LuaTeX error [string "\directlua "]:1: invalid escape sequence near '\%'.
\formatDuration ...0:" and d or string.sub(d,3)) }
\IsNilReturn #1->\edef \tmp {#1
}\doifelse {\tmp }{nil}{\color [red]{ERROR}}{...
Whereas in a previous Context all went well:
ConTeXt ver: 2012.05.30 11:26 MKIV fmt: 2013.2.4 int: english/english
What did change? Why? And how to repair?
Hans van der Meer
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