On Thu, 7 Nov 2013, Géry Ogam wrote:

>> I'm sure there is also a "cleaner" TeX way, but I'm not experienced
> enough for that.
>
> I think you misunderstood my issue: your Lua way does the same thing than
> my TeX way: it displays:
>
> ONE Cool
> 2 Cat
> 3 Mouse
>
> but that is NOT what I want. What I want is:
>
> 1 Cool
> 2 Cat
> 3 Mouse
>
> So I need to check if the chapter label has been set empty or not by the
> user, because it is not empty (let's say the user chose the string
> "CHAPTER~" for the chapter label) I want to display this:
>
> CHAPTER ONE Cool
> CHAPTER 2 Cat
> CHAPTER 3 Mouse

> The way to do that is to check if the variable \currentstructurelabel is
> empty, so the code must be:

Why not just check the labeltext?

   \define[1]\MyConversion
       {\doifelse{#1}{1}{ONE}{#1}}

   \define\CheckedConversion % #1 number
       {\doiftextelse{\labeltexts{chapter}}\MyConversion\numbers}

   \defineconversion[CheckedConversion][\CheckedConversion]

   \setuphead[chapter][conversion=CheckedConversion]

   \doifmode{label}{\setuplabeltext[chapter=CHAPTER~]}
   \starttext
         \chapter{Cool}
         \chapter{Cat}
         \chapter{Mouse}
   \stoptext


compile with and without --mode=label.


Aditya