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 <illinguista1...@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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