Hello all, I am a newcomer in lisp. I hope the mailling list is a right channel to write this.
I imaginated a feature for iterate. A built-in clause that inserts a symbol-macro in iterate output. It seems useful to me because symbol-macros are elegant setf-able places. Here is a clause named `ACCESS var IN-VECTOR v` with a symbol macro for var. ``` (defparameter *my-vector* (make-array 8 :initial-contents (iter (for i from 1 to 8) (collect i))) (print *my-vector*) #(1 2 3 4 5 6 7 8) (iter (access i in-vector *my-vector*) (incf i 10)) (print *my-vector*) #(11 12 13 14 15 16 17 18) ``` The clause would be writen like this : ``` (defmacro-clause (ACCESS var IN-VECTOR v) "Access the elements of a vector" (let ((vect (gensym)) (end (gensym)) (index (gensym))) ‘(progn (with ,vect = ,v) (with ,end = (array-dimension ,vect 0)) (for ,index from 0 to (1- ,end)) (with-symbol-macro ,var (aref ,vect ,index))))) ``` I see no way to implement it without modifications in the iterate macro. But I think this can be implemented inserting a `symbol-macrolet ,(nreverse *symbol-macro-bindings*)` just after `let* ,(nreverse *bindings*)` in the iterate macro output. I would like to try to implement it. My questions : 1. Are they existing approaches to get the same result in iterate ? 2. Does some common lisp iteration systems already provides this feature in their built-ins clauses or in the extension mechanism ? 3. Does someone already tried to implement this kind of feature in iterate ? 4. What are the contributing guidelines on the common lisp gitlab repository ? I plan to imitate the current symbol naming, comment and commit style ; and writing the corresponding unit tests.
