[NTG-context] Custom TOC with makeup and setups

[Jethro Djan via ntg-context <ntg-context@ntg.nl>]

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Hello,

I am trying to create a presentation where at the start of each section in
my presentation, a custom TOC page is shown. When I am at a particular
section, the TOC will grey out all other sections (not implemented in my
MWE). I have tried different ways but I find using makeups for the TOC page
works ok (following
https://wiki.contextgarden.net/Command/setuplistalternative and Aditya's
presentation slides on their blog). My challenge is that when a makeup page
is inserted, it leaves a page with the section name blank before it. How do
I fix it? Any other way to achieve this is also welcome. My MWE:

\setuppapersize[S6]
\startuseMPgraphic{itemize:toc}
  save p; path p;
  p := ( (0,-0.5)--(0,0.5)--(0.866,0)--cycle ) scaled 1.5ExHeight;
  fill p withcolor \MPcolor{Black};
\stopuseMPgraphic

\definesymbol[itemize:toc][\useMPgraphic{itemize:toc}]

\definelistalternative
  [toclist]
  [renderingsetup=list:toclist]

\setupheadtext[section=Table of Contents]

\startsetups toclist
  \framed[align=normal, frame=off]{\placelist [section] [criterium=all,
alternative=toclist]}
\stopsetups

\definehspace[tspace][4cm]
\setupframed[
  height=fit,
  width=fit,
  location=middle,
  frame=off,
  align=normal,
  offset=none,
]
\startsetups list:toclist
  {\hbox to \hsize \bgroup
  \hspace[tspace]
  \framed[width=10mm,align=flushleft]{\symbol[itemize:toc]}%
  \framed[empty=yes]{\currentlistentrynumber\currentlistentrypagenumber}%
  \doifelse\currentlistentrylocation{\namedstructureheadlocation{section}}{%
    \framed[align=flushright,]{{\bfb\currentlistentrytitle}}%
  }{\framed[align=flushright,]{\currentlistentrytitle}}
  \egroup}
\stopsetups



 \definemakeup
  [toc]
  [
    doublesided=no,
    page=yes,
    bottom=,
    top=,
    pagestate=start,
    headerstate=empty,
    footerstate=empty,
    setups={toclist},
    before=\setups{toc:setups},
  ]
\startsetups toc:setups
  \setupbackgrounds[page][background=color, backgroundcolor=blue]
\stopsetups

 \definemakeup
  [standard]
  [
    doublesided=no,
    page=right,
    pagestate=start,
    headerstate=empty,
    footerstate=empty,
    before=\setups{standard:setups},
  ]

 \startsetups standard:setups
    \setupbackgrounds[page][background=color, backgroundcolor=lightgray]
 \stopsetups

 \define\TOC{
  \starttocmakeup
  \stoptocmakeup
 }

\starttext

\startstandardmakeup
  \title{Your Title Here}
\stopstandardmakeup

\startsection[title={Motivation}]
\TOC
\startitemize

\item something cool
\item something else cool

\stopitemize
\stopsection

\startsection[title={Main strands of theory}]
\TOC
\startitemize

\item another cool thing
\item cool too

\stopitemize
\stopsection


\stoptext

Thanks in advance.

Jethro

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