ConTeXt : combine fonts

Question

I would like to create a font that uses palatino (or pagella) for the text but euler for the math. If I understand correctly the documentation, it should be achievable with typefaces, but I can't get it to working : all the text is in Latin. Here is a MWE inspired from the doc :

\starttypescript [perso] [texnansi, ec, qx, t5, default]
  \definetypeface[perso] [rm] [Xserif] [palatino] [default]
  \definetypeface[perso] [tt] [Xmono] [palatino] [default]
  \definetypeface[perso] [mm] [Xmath] [euler] [default]
\stoptypescript

\starttext

\setupbodyfont[perso]
Bonjour les ami·e·s
\startformula
  x + 3 = \mathcal{P}
\stopformula

\setupbodyfont[palatino]
Bonjour les ami·e·s
\startformula
  x + 3 = \mathcal{P}
\stopformula

\stoptext

What am I doing wrong ?

Thank you in advance

Answer 1

I would like to create a font that uses palatino (or pagella) for the text but euler for the math.

ConTeXt already has a builtin solution for this:

\setupbodyfont[pagella-with-euler]

\startTEXpage
    Euler's Formula: $e^{i\pi} + 1 = 0$
\stopTEXpage

Regarding the code you posted:

\starttypescript [perso] [texnansi, ec, qx, t5, default]  
  \definetypeface[perso] [rm] [Xserif] [palatino] [default]  
  \definetypeface[perso] [tt] [Xmono] [palatino] [default]  
  \definetypeface[perso] [mm] [Xmath] [euler] [default]
\stoptypescript

\starttext

\setupbodyfont[perso]

1. Listing the encodings is deprecated for almost a decade now.
2. You should use serif instead of Xserif, and mono instead of Xmono, … .
3. ConTeXt doesn't define a font with the name euler, so you need to actually use eulernova (which is essentially the same thing).
4. \setupbodyfont is best before \starttext (to prevent loading the LM fallback font).

So:

\setuppagenumbering[state=stop]

\starttypescript [perso]
    \definetypeface[perso] [rm] [serif] [palatino]  [default]
    \definetypeface[perso] [tt] [mono]  [palatino]  [default]
    \definetypeface[perso] [mm] [math]  [eulernova] [default]
\stoptypescript
\setupbodyfont[perso]

\starttext
    Bonjour les ami·e·s

    \startformula
    x + 3 = \mathcal{P}
    \stopformula
\stoptext