Hi, Wisp is now in draft state as SRFI-119: http://srfi.schemers.org/srfi-119/
The version up there is mostly what we discussed here. The main part
which changed are the clarifications.
- To represent tail notation like (define (foo . args)), either avoid
a linebreak before the dot as in define : foo . args or use a double
dot to start the line: . . args. The first dot mark the line as
continuation, the second enters the scheme code.
- A dot as symbol at the end of a line is reserved for potential
future use. It should be a syntax error if the next non-empty line
starts with non-zero indentation. A lone dot at the end of a line
calls for hard to catch errors.
- A dot as only symbol in a line has no useful meaning: the line is by
definition empty. As such, a dot as only symbol on a line is also
reserved for future use and should be treated as a syntax error to
avoid locking out future possibilities.
The part I like best in the draft is the example which shows all
features of wisp (including compatibility with curly infix)
in just 7 lines:
define : factorial n
__ if : zero? n
____ . 1
____ * n : factorial {n - 1}
display : factorial 5
newline
Best wishes,
Arne
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