Thanks again, Hans, for all the different approaches, very instructive!
However, after playing around a bit, I do have a question that I can't work
out:
\getdummyparameters[headtitle=,#1]
\ifempty{\dummyparameter{headtitle}}
will never be true? See below in context:
> On Dec 14, 2021, at 19:16, Hans Hagen <j.ha...@xs4all.nl> wrote:
>
> On 12/14/2021 6:16 PM, Benjamin Buchmuller via ntg-context wrote:
>> Hi!
>> I'd like to follow up on a problem that Denis came across recently with the
>> titles argument in tabulate. (It's more a solution than a question, but any
>> hints to improve the answer are welcome.) I wanted to use this argument for
>> an easy specification of, well, a title for a "recipe". The advantage is
>> that all information is held together and it's easy to use for people who
>> are not (too) familiar with ConTeXt.
>> So, in one file I can define all styles (which the end-user would not need
>> to see):
>> \definetabulate[recipe][|l|l|p|l|]
>> \setuptabulate
>> [recipe]
>> [
>> bodyfont=small,
>> distance=medium,
>> before={\blank[back, small]},
>> header=text,
>> headstyle=\bi, % this formats the "\BC" cells
>> headcolor=red, % this formats the "\BC" cells
>> ]
>> \starttext
>> And then use:
>> \startrecipe[title={Whatever mixture 1}]
>> \FL
>> \NC Absolute \BC Stock \NC Ingredient \NC Final \NR
>> \HL
>> \NC 1 \NR
>> \LL
>> \stoprecipe
>> \startrecipe[title={Whatever mixture 2}]
>> \FL
>> \BC Absolute \BC Stock \BC Ingredient \BC Final \NR
>> \HL
>> \NC 1 \NR
>> \LL
>> \stoprecipe
>> \stoptext
>> etc.
>> However, I cannot change the way the title is styled (or spaced from the
>> table) unless I do "title={\bi Some text.}". However, blank commands are
>> also stripped off at this place. (I also don't get a clue from the source if
>> there is any argument to spike-in some formatting.)
>> So, if there is no easy way to access this one, we can work around:
>> \definetabulate[recipetab][|l|l|p|l|]
>> \setuptabulate
>> [recipetab]
>> [
>> bodyfont=small,
>> distance=medium,
>> before={\blank[back, small]},
>> % header=text, % THIS MUST NOT BE "text"
>> headstyle=bold,
>> headcolor=red,
>> ]
>> \define\startrecipe{\dodoubleempty\dostartrecipe}
>> \long\def\dostartrecipe[#1][#2]#3\stoprecipe{%
>> \iffirstargument
>> {\bi #1}\blank[medium]
>> \fi
>> \ifsecondargument
>> \startrecipetab[#2]
>> #3
>> \stoprecipetab
>> \else
>> \startrecipetab
>> #3
>> \stoprecipetab
>> \fi
>> }
>> \startrecipe[Head 1]
>> \FL
>> \BC Absolute \BC Stock \BC Ingredient \BC Final \NR
>> \HL
>> \NC 1 \NR
>> \LL
>> \stoprecipe
>> \startrecipe[Head 2][headcolor=blue] % pass on arguments to tabulate
>> \FL
>> \BC Absolute \BC Stock \BC Ingredient \BC Final \NR
>> \HL
>> \NC 1 \NR
>> \LL
>> \stoprecipe
>> Small question though: Is there a ConTeXt way to "\long\def" or a simple way
>> ("user interface") to filter a list of arguments for a specific key=val
>> pair, e.g. to make a single optional argument with headertitle={Some
>> header.}?
> context has no (need for) \long ... all is long (i mever saw a reason for
> using it)
>
> (1) use a proper head:
>
> \definehead[RecipeHead][subsubsubsubsubsubject]
> \setuphead [RecipeHead][style=bolditalic,after={\blank[medium]}]
>
> \definetabulate[recipetab][|l|l|p|l|]
>
> \setuptabulate
> [recipetab]
> [bodyfont=small,
> distance=medium,
> before={\blank[back, small]},
> headstyle=bold,
> headcolor=red]
>
> here's a one-step lmtx solution:
>
> \let\stoprecipe\relax
>
> \tolerant\protected\def\startrecipe[#1]#*[#2]#3\stoprecipe
> {\ifcstok{#1}\emptytoks\else
> \RecipeHead{#1}
> \fi
> \ifcstok{#2}\emptytoks
> \startrecipetab#3\stoprecipetab
> \else
> \startrecipetab[#2]#3\stoprecipetab
> \fi}
>
> or just
>
> \tolerant\protected\def\startrecipe[#1]#*[#2]#3\stoprecipe
> {\ifempty{#1}\else
> \RecipeHead{#1}
> \fi
> \ifempty{#2}%
> \startrecipetab#3\stoprecipetab
> \else
> \startrecipetab[#2]#3\stoprecipetab
> \fi}
>
>
> and here's one that does what you ask (in the core i'd try to avoid grabbing
> too much arguments and if real core we'd make sure dummy parameters don;t
> interfere):
>
> \tolerant\protected\def\startrecipe[#1]#2\stoprecipe
> {\ifempty{#1}%
> \startrecipetab#2\stoprecipetab
> \orelse\ifhastok={#1}%
> \getdummyparameters[headtitle=,#1]
> \ifempty{\dummyparameter{headtitle}}\else
> \normalexpanded{\RecipeHead{\dummyparameter{headtitle}}}
> \fi
> \startrecipetab[#1]#2\stoprecipetab
> \else
> \RecipeHead{#1}
> \startrecipetab#2\stoprecipetab
> \fi}
>
> \startrecipe[headtitle={Head 3},headcolor=blue] % pass on arguments to
> tabulate
> \FL
> \BC Absolute \BC Stock \BC Ingredient \BC Final \NR
> \HL
> \NC 1 \NR
> \LL
> \stoprecipe
Consider:
\startrecipe[headcolor=darkyellow] % pass on arguments to tabulate
\FL
\BC Absolute \BC Stock \BC Ingredient \BC Final \NR
\HL
\NC 1 \NR
\LL
\stoprecipe
This leaves a blank header line instead of none.
Complete example with XXXXX control:
\definehead[RecipeHead][subsubsubsubsubsubject]
\setuphead [RecipeHead][style=bolditalic,after={\blank[medium]}]
\definetabulate[recipetab][|l|l|p|l|]
\setuptabulate
[recipetab]
[bodyfont=small,
distance=medium,
before={\blank[back, small]},
headstyle=bold,
headcolor=red]
\let\stoprecipe\relax
\tolerant\protected\def\startrecipe[#1]#2\stoprecipe
{\ifempty{#1}%
\startrecipetab#2\stoprecipetab
\orelse\ifhastok={#1}%
\getdummyparameters[headtitle=,#1] % this should make headtitle by default
empty, but doesn't?
\ifempty{\dummyparameter{headtitle}}XXXXX\else
\normalexpanded{\RecipeHead{\dummyparameter{headtitle}YYYY}}
\fi
\startrecipetab[#1]#2\stoprecipetab
\else
\RecipeHead{#1}
\startrecipetab#2\stoprecipetab
\fi}
some text
\startrecipe[headtitle={Head 3},headcolor=blue] % pass on arguments to tabulate
\FL
\BC Absolute \BC Stock \BC Ingredient \BC Final \NR
\HL
\NC 1 \NR
\LL
\stoprecipe
some text
\startrecipe[headcolor=darkyellow] % pass on arguments to tabulate
\FL
\BC Absolute \BC Stock \BC Ingredient \BC Final \NR
\HL
\NC 1 \NR
\LL
\stoprecipe
>
> Here's a variant:
>
> \def\theparameter#1#2%
> {\beginlocalcontrol
> \begingroup
> \getdummyparameters[#1=,#2]%
> \normalexpanded{\endgroup\endlocalcontrol\dummyparameter{#1}}}
>
> \tolerant\protected\def\startrecipe[#1]#2\stoprecipe
> {\ifempty{#1}%
> \startrecipetab#2\stoprecipetab
> \orelse\ifhastok={#1}%
> \edef\MyHeadTitle{\theparameter{headtitle}{#1}}%
> \ifempty\MyHeadTitle\else
> \normalexpanded{\RecipeHead{\MyHeadTitle}}
> \fi
> \startrecipetab[#1]#2\stoprecipetab
> \else
> \RecipeHead{#1}
> \startrecipetab#2\stoprecipetab
> \fi}
>
> or just
>
> \tolerant\protected\def\startrecipe[#1]#2\stoprecipe
> {\ifempty{#1}%
> \startrecipetab#2\stoprecipetab
> \else
> \edef\MyHeadTitle{\theparameter{headtitle}{#1}}%
> \ifempty\MyHeadTitle\else
> \normalexpanded{\RecipeHead{\MyHeadTitle}}
> \fi
> \startrecipetab[#1]#2\stoprecipetab
> \fi}
>
> or
>
> \tolerant\protected\def\startrecipe[#1]#2\stoprecipe
> {\ifempty{#1}%
> \startrecipetab#2\stoprecipetab
> \else
> \ifcstok{\theparameter{headtitle}{#1}}\emptytoks\else
> \normalexpanded{\RecipeHead{\theparameter{headtitle}{#1}}}
> \fi
> \startrecipetab[#1]#2\stoprecipetab
> \fi}
>
> or ... or ... or ...
>
> just play with it a bit till you have something that looks nice in code too
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
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