Taco, this works!
Thank you!

Now (last question), it's possibile to centering in the middle of the page
the whole verse block ?

Tommy

Il giorno gio 2 lug 2020 alle ore 15:56 Taco Hoekwater <taco@elvenkind.com>
ha scritto:

>
> I was having fun with this as well while Hans was writing his generic
> solution.
>
> Here is an explicit ‘indent each 2nd and 3rd line’:
>
> %%%%%%%%
> \unprotect
>
> \installindentingmethod {three}
> {\c_spac_indentation_toggle_state\plusthree}
>
> \unexpanded\def\spac_indentation_tri_toggle_indeed
>   {\glet\checkindentation\spac_indentation_tri_toggle}
>
> \unexpanded\def\spac_indentation_tri_toggle
>   {\gdef\checkindentation
>       {\spac_indentation_remove
>        \gdef\checkindentation{\spac_indentation_tri_toggle_indeed}}}
>
> % this next macro is redefinition of a core macro !
> \def\spac_indentation_check_toggle
>  {\ifcase\c_spac_indentation_toggle_state
>     % nothing
>   \or
>     \spac_indentation_no_toggle
>   \or
>     \spac_indentation_do_toggle
>   \or
>     \spac_indentation_tri_toggle
>   \fi}
> \protect
> %%%%%%%%%%
>
> to be used with:
>
>   \setuplines[indenting=three]
>
>
> Best wishes,
> Taco
>
> > On 2 Jul 2020, at 15:01, Tommaso Gordini <illinguista1972@gmail.com>
> wrote:
> >
> > \starttext
> >
> > \setupindenting[yes,1em]
> > \setuplines[indenting=even]
> >
> > \startlines
> > Per correr miglior acque alza le vele
> > omai la navicella del mio ingegno,
> > che lascia dietro a sé mar sì crudele;
> > e canterò di quel secondo regno
> > dove l'umano spirito si purga
> > e di salire al ciel diventa degno.
> > \stoplines
> >
> > \stoptext
>
> Taco Hoekwater
> Elvenkind BV
>
>
>
>
>
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