(set! *print-level* 8) ;;so you can see all of macroexpand-1
;;;;;;MISC Utilities
;;;;;;
;;;;;;
(defn mklst [item] (if (list? item) item (list item)))
(defn lassoc [item lst]
(first (filter #(= (first (mklst %)) item) lst)))
(defmacro llet [bind & body]
`(let ~(vec
(mapcat #(if-not (list? %) (list % nil) %) bind))
~...@body))
(defmacro lcond [& cond]
(let [bindings
(mapcat
#(list (first %) `(do ~@(rest %)))
cond)]
`(cond ~...@bindings)))
;;;;;;
;;;;;;
;;;;;;
(defn condlet-binds [vars cl]
(map (fn [bindform]
(if (list? bindform)
(cons
(second (lassoc (first bindform) vars))
(rest bindform))))
(rest cl)))
(defn condlet-clauses [vars cl bodfn]
`(~(first cl) (llet ~(map second vars)
(llet ~(condlet-binds vars cl)
(~bodfn ~@(map second vars))))))
(defmacro condlet [clauses & body]
(let [vars (map #(list % (gensym))
(distinct
(map first
(mapcat rest clauses))))
bodfn (gensym)]
`(letfn ((~bodfn ~(vec (map first vars))
~...@body))
(lcond ~@(map #(condlet-clauses vars % bodfn)
clauses)))))
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