Simple indentation utility for code generators
t is the type of the data to be printed.
`Line: single line (not indented)
`Block: indented sequence
`Inline: in-line sequence (not indented)
let l = [ `Line "d"; `Line "e"; ] in [ `Line "a"; `Block [ `Line "b"; `Line "c"; ]; `Inline l; `Line "f"; ]
a b c d e f
Write to a string. See
to_buffer for the options.