[NTG-context] algorithms style : need \starttyping with TeX and math feature

Bonjour à tous, I'm trying to white some algorithms in natural language (versus pseudo-computing langage) I need to keep some "typing" for write space (i.e. indentation of text) while being able to white TeX commands (with \xxx{yyy}) and math (like $y_u(t)$) In fact I'd like some LaTeX algorithms style like feature. I could do some recursive \startitemize...\stopitemize... but it is two much verbose, so I thought looking at the ConTeXt "typing" system Also, perhaps my request is simply an option of \startlines which keep not only the lines break, but also the first spaces of each line (in a verbatim font fors these space) Thank you for any help! -- Maurice Diamantini