Since the structureuservariables of a section aren’t defined in that section’s
"before", I would need a macro or buffer to define the contents of that
epigraph page, like this:
\def\PreImg{Dummy}
\startsetups FancyChapter
\setupheadertexts[][][][]
\doifelsebuffer{Quote}{
\doifoddpageelse
{\page[left]}
{\donothing}
{\definedfont[SerifItalic at 16pt]\quotation{\getbuffer[Quote]}\par}
\externalfigure[\PreImg][width=\textwidth]
\resetbuffer[Quote]
}{}
\page[right]
\stopsetups
\setupheadertexts[][pagenumber][pagenumber][chapter]
\setuphead[chapter][
page=yes,
before={\directsetup{FancyChapter}},
]
\setuppagenumbering[alternative=doublesided]
\starttext
\completecontent
\startchapter[title={My Normal Text}]
\input knuth
\stopchapter
\def\PreImg{Real}
\startbuffer[Quote]
I thought that was real.
\stopbuffer
\startchapter[title={My Fancy Story}]
\input tufte
\stopchapter
\def\PreImg{Love}
\startbuffer[Quote]
All you need is love.
\stopbuffer
\startchapter[title={Another Fancy Story}]
\input zapf
\stopchapter
\startchapter[title={Another Normal Text}]
\input knuth
\stopchapter
\stoptext
That’s possible, but ugly. I would really like to set those quotes and image
names in the chapter command.
Best, Hraban
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