Overhaul

Loads of changes, some which I wasn't sure what I was on when doing
them

.gitignore

@@ -1,3 +1,3 @@
 TAGS
 bin/
-/system-index.txt
+system-index.txt

README.txt

@@ -23,4 +23,5 @@ Requirements:
 
 Run:
     $ ./build
-to compile the program.
+to compile the program.  Binary artifact should be located under
+`./bin/cantedraw`.

cantedraw.asd

@@ -2,7 +2,7 @@
   :author "Aryadev Chavali <aryadev@aryadevchavali.com>"
   :license "GPL-2"
   :depends-on (:alexandria)
-  :in-order-to ((asdf:test-op (asdf:test-op :cantedraw/tests)))
+  :in-order-to ((test-op (test-op :cantedraw/tests)))
   :components ((:file "packages")
                (:module "lib"
                 :components
@@ -25,14 +25,8 @@
                :parachute)
   :components ((:module "tests"
                 :components
-                ((:file "macros")
-                 (:file "functions")
-                 (:file "model")
-                 ;; (:file "player")
-                 ;; (:file "game")
-                 (:file "main"))))
-  :perform (test-op (op c) (uiop:symbol-call :parachute :test
-                                             :cantedraw/tests/main)))
+                ((:file "test"))))
+  :perform (test-op (op c) (uiop:symbol-call :parachute :test :cantedraw/tests/main)))
 
 ;; Compress image for smaller binary size.
 #+nil

lib/functions.lisp

@@ -19,21 +19,21 @@
 
 (in-package :cantedraw.lib.functions)
 
-(fn range (start end &optional (step 1)) (-> (fixnum fixnum &optional fixnum) list)
-  "Make a list of numbers from START to END (exclusive).  If STEP is given, then
-each member is STEP distance apart."
+(fn range (&key (start 0) (end 0) (step 1))
+    (-> (&key (:start fixnum) (:end fixnum) (:step fixnum))
+        list)
+  "Return list of integers in interval [START, END).  If STEP is given, then
+each member is STEP distance apart i.e. {START + n * STEP | n from 0}.
+
+If END is not given, return interval [0, START)."
   (if (< end start)
       (error (format nil "~a < ~a" end start))
       (loop :for i :from start :to (1- end) :by step
             :collect i)))
 
-(fn take (n lst) (-> (fixnum sequence) sequence)
-  "Return the first N elements of LST."
-  (subseq lst 0 n))
-
 (fn split (n lst) (-> (fixnum sequence) (values sequence sequence))
   "Return CONS where CAR is the first N elements of LST and CDR is the rest."
-  (values (take n lst)
+  (values (subseq lst 0 n)
           (subseq lst n)))
 
 (fn rev-map (indicator lst &key (key-eq #'eq))

lib/macros.lisp

@@ -124,3 +124,8 @@ sequentially via ->>"
 (defmacro alist-val (key alist)
   "Helper macro for getting the value of KEY in ALIST."
   `(cdr (assoc ,key ,alist)))
+
+(defmacro call-rev (func-name &rest arguments)
+  "Call a function with arguments but in reverse
+i.e. (call-rev f x1 x2 ... xn) => (f xn ... x2 x1)."
+  `(,func-name ,@(reverse arguments)))

packages.lisp

@@ -22,7 +22,7 @@
   (:use :cl)
   (:export
    :--> :->> :-<>
-   :-> :fn
+   :-> :fn :call-rev
    :while :alist-val
    :$-> :$>> :$<>))
 
@@ -31,8 +31,7 @@
   (:use :cl :5d-lib.macros)
   (:export
    :parse-integer*
-   :range :take :split
-   :rev-map
+   :range :split :rev-map
    :remove-at-indices))
 
 (defpackage cantedraw.model
@@ -40,7 +39,7 @@
   (:use :cl :5d-lib.macros :5d-lib.functions)
   (:export
    ;; Types
-   :int-card :rank :suit :cardset
+   :int-card :rank :suit :cardset :cardset-p
    ;; card struct
    :card :make-card :card-suit :card-rank :card-p
    ;; Converters
@@ -59,9 +58,10 @@
    :5d-lib.macros :5d-lib.functions
    :5d.model)
   (:export
-   :player
-   :error-player-nonexistent
-   :error-player-broke
+   ;; player struct
+   :player :make-player :player-name :player-balance :player-hand :player-p
+   :make-player-table
+   :error-player-nonexistent :error-player-broke
    :player-exists? :player-bankrupt? :player-can-pay?
    :player-debit
    :player-credit
@@ -81,5 +81,5 @@
   (:nicknames :5d.main)
   (:use :cl
    :5d-lib.macros :5d-lib.functions
-   :5d.model :5d.game)
+   :5d.model :5d.player :5d.game)
   (:export :start))

src/game.lisp

@@ -19,8 +19,8 @@
 
 (in-package :cantedraw.game)
 
-(fn deal-cards (n deck) (-> (fixnum cardset) (cons cardset cardset))
-  (destructuring-bind (hand . rest) (split n deck)
+(fn deal-cards (n deck) (-> (fixnum cardset) (cons cardset ))
+  (multiple-value-bind (hand rest) (split n deck)
     (cons (sort hand #'card<) rest)))
 
 (fn deal-hands (n deck) (-> (fixnum cardset) (cons list cardset))

src/main.lisp

@@ -41,7 +41,7 @@
     (while (null inp)
       (format t "Need at least one integer...~%")
       (force-output)
-      (setq inp (read-integers)))
+      (->> (read-integers) (setq inp)))
     inp))
 
 (fn is-valid-hand-index (n) (-> (fixnum) boolean)
@@ -51,16 +51,16 @@
 (fn read-until-valid-integers () (-> nil list)
   (let ((inp (remove-duplicates (read-integers))))
     (while (not (and (every #'is-valid-hand-index inp)
-                     (< (length inp) 5)
+                     (<= (length inp) 5)
                      (>= (length inp) 0)))
       (format t "Need at most 5 integers between 0 and 4...~%")
       (force-output)
-      (setq inp (remove-duplicates (read-integers))))
+      (->> (read-integers) remove-duplicates (setq inp)))
     inp))
 
-(fn read-and-confirm-valid-integers (hand) (-> nil list)
+(fn read-and-confirm-valid-integers (hand) (-> (cardset) list)
   (let ((confirm nil)
-        inp)
+        (inp nil))
     (while (null confirm)
       (setq inp (read-until-valid-integers))
       (if (null inp)
@@ -69,7 +69,7 @@
                      :collect (nth index hand))
                cardset->str
                (format t "To redeal: ~a~%")))
-      (setq confirm (y-or-n-p "Confirm: ")))
+      (setq confirm (y-or-n-p "Confirm:")))
     inp))
 
 (defun print-hand (hand)
@@ -97,8 +97,10 @@
       (->> (make-deck)
            alexandria:shuffle
            (read-redeal-print nil))
+    (format t "~C[2J" #\Esc)
     (format t "Cards remaining: {~a}
 
-Final hand: [~a]"
+Final hand: [~a]
+"
             (cardset->str rest)
             (cardset->str final-hand))))

src/model.lisp

@@ -32,9 +32,9 @@
 
 (deftype int-card () `(integer 0 51))
 
-(deftype cardset () `(and list (satisfies cardsetp)))
+(deftype cardset () `(and list (satisfies cardset-p)))
 
-(fn cardsetp (lst) (-> (list) boolean)
+(fn cardset-p (lst) (-> (list) boolean)
   (every #'card-p lst))
 
 (fn int->suit (n) (-> (fixnum) suit)

src/player.lisp

@@ -40,8 +40,8 @@
              (id err) (balance err) (required err)))))
 
 (fn player-exists? (id table) (-> (symbol hash-table) boolean)
-  (and (gethash id table)
-       (player-p (gethash id table))))
+  (let ((item (gethash id table)))
+    (and item (player-p item))))
 
 (defun error-if-no-player (id table)
   (unless (player-exists? id table)
@@ -60,12 +60,12 @@
   (unless (player-can-pay? id table amount)
     (error 'error-player-broke
            :id id :balance (player-balance (gethash id table)) :required amount))
-  (decf (player-balance (gethash id table)) amount))
+  (-<> id (gethash table) player-balance (decf amount)))
 
 (fn player-credit (id table amount) (-> (symbol hash-table fixnum) fixnum)
   (error-if-no-player id table)
-  (incf (player-balance (gethash id table)) amount))
+  (-<> id (gethash table) player-balance (incf amount)))
 
 (fn player-set-cards (id table cards) (-> (symbol hash-table cardset) t)
   (error-if-no-player id table)
-  (setf (player-hand (gethash id table)) cards))
+  (-<> id (gethash table) player-hand (setf cards)))

tests/functions.lisp

@@ -1,115 +0,0 @@
-;;; functions.lisp - 2025-02-20
-
-;; Copyright (C) 2025 Aryadev Chavali
-
-;; This program is distributed in the hope that it will be useful, but WITHOUT
-;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-;; FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
-;; details.
-
-;; You may distribute and modify this code under the terms of the GNU General
-;; Public License Version 2, which you should have received a copy of along with
-;; this program.  If not, please go to <https://www.gnu.org/licenses/>.
-
-;;; Code:
-
-(defpackage cantedraw/tests/functions
-  (:use
-   :cl :parachute :cantedraw.lib.macros
-   :cantedraw.lib.functions))
-
-(in-package :cantedraw/tests/functions)
-
-(define-test function-test)
-
-(define-test (function-test "parse-integer*")
-  :compile-at :execute
-  (is eq 2    (parse-integer* "2"))
-  (is eq 2048 (parse-integer* "2048abcdef"))
-  (is eq nil    (parse-integer* "a2048abcdef"))
-  (is eq nil    (parse-integer* "garbage"))
-  (fail       (parse-integer* nil)))
-
-(define-test (function-test range)
-  :compile-at :execute
-  (fail (range 1 0))
-  (fail (range nil nil))
-  (fail (range "a" "b"))
-  (true (null (range 1 1)))
-  (is equal '(1 2 3 4)    (range 1 5))
-  (is equal '(-3 -2 -1 0) (range -3 1)))
-
-(define-test (function-test take)
-  :depends-on ((cantedraw/tests/macros ->>))
-  :compile-at :execute
-  (fail (take nil nil))
-  (fail (take 100 nil))
-  (fail (take nil 100))
-  (true (->> (list 1 2 3 4) (take 0) null))
-  (is equal "H" (take 1 "Hello"))
-  (is equal '(1 2) (take 2 '(1 2 3 4 5))))
-
-(define-test (function-test split)
-  :compile-at :execute
-  (fail (split nil nil))
-  (fail (split 100 nil))
-  (fail (split nil 100))
-  (is-values (split 0 '(1 2 3 4))
-    (eq nil)
-    (equal '(1 2 3 4)))
-  (is-values (split 1 '(1 2 3 4))
-    (equal '(1))
-    (equal '(2 3 4)))
-  (is-values (split 5 "Hello World")
-    (string= "Hello")
-    (string= " World")))
-
-(define-test (function-test rev-map)
-  :depends-on (range
-               (cantedraw/tests/macros ->>))
-  :compile-at :execute
-  (fail (rev-map nil nil))
-  (fail (rev-map "a string" "another string" :key-eq "not a function"))
-  (true (->> nil (rev-map #'identity) null))
-  (let ((res (rev-map #'evenp (range 1 7))))
-    (false (null res))
-    (is equal 2 (length res))
-    (is equal 3 (->> (assoc t res) cdr length))
-    (is equal 3 (->> (assoc nil res) cdr length))
-    (true (->> (assoc t res) cdr (every #'evenp)))
-    (true (->> (assoc nil res) cdr (every #'oddp))))
-  (let* ((mod* (lambda (n) (mod n 3)))
-         (res (rev-map mod* (range 1 12))))
-    (false (null res))
-    (is equal 3 (length res))
-    (is equal 3 (->> (assoc 0 res) cdr length))
-    (is equal 4 (->> (assoc 1 res) cdr length))
-    (is equal 4 (->> (assoc 2 res) cdr length))
-    (true (->> (assoc 0 res) cdr (every (lambda (x) (= (mod x 3) 0)))))
-    (true (->> (assoc 1 res) cdr (every (lambda (x) (= (mod x 3) 1)))))
-    (true (->> (assoc 2 res) cdr (every (lambda (x) (= (mod x 3) 2))))))
-  (let ((res (rev-map #'identity "lots of letters")))
-    (false (null res))
-    (is equal 2 (->> (assoc #\l res) cdr length))
-    (is equal 3 (->> (assoc #\t res) cdr length))
-    (is equal 2 (->> (assoc #\space res) cdr length))
-    (is equal 2 (->> (assoc #\s res) cdr length))))
-
-(define-test (function-test remove-at-indices)
-  :depends-on (range)
-  :compile-at :execute
-  (fail (remove-at-indices "a string" "another string"))
-  (true (null (remove-at-indices nil nil)))
-  (is equal '(1 2 3) (remove-at-indices nil '(1 2 3)))
-  (is equal '(2) (remove-at-indices '(0 2) '(1 2 3)))
-  (let* ((inp (range 100 200))
-         (t1 (remove-at-indices (range 0 100 2) inp))
-         (t2 (remove-at-indices (range 1 100 2) inp)))
-    (is equal 50 (length t1))
-    (is equal 50 (length t2))
-    (true (every (lambda (n) (not (member n t2))) t1))
-    (true (every (lambda (n) (not (member n t1))) t2)))
-  (let* ((indices (list 0 5 6 7 8 9 10))
-         (str-lst (remove-at-indices indices "Hello World"))
-         (ret (coerce str-lst 'string)))
-    (is string= "ello" ret)))

tests/macros.lisp

@@ -1,64 +0,0 @@
-;;; main.lisp - 2025-02-16
-
-;; Copyright (C) 2025 Aryadev Chavali
-
-;; This program is distributed in the hope that it will be useful, but WITHOUT
-;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-;; FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
-;; details.
-
-;; You may distribute and modify this code under the terms of the GNU General
-;; Public License Version 2, which you should have received a copy of along with
-;; this program.  If not, please go to <https://www.gnu.org/licenses/>.
-
-;;; Code:
-
-(defpackage cantedraw/tests/macros
-  (:use :cl :cantedraw.lib.macros
-        :parachute))
-
-(in-package :cantedraw/tests/macros)
-
-(define-test macro-test)
-
-(define-test (macro-test "-->")
-  (true (null          (--> x)))
-  (is eq 'a            (--> x 'a))
-  (is eq 2             (--> x 1 (1+ x)))
-  (is eq 2             (--> x 1 1+))
-  (is string= "World!" (--> _ "Hello" (format nil "~a World!" _) (subseq _ 6))))
-
-(define-test (macro-test "->>")
-  (true (null (->>)))
-  (let ((a (gensym))
-        (b (gensym))
-        (c (gensym))
-        (d (gensym)))
-    (is eq a (->> a))
-    (is equal `(,a ,b)           (macroexpand `(->> ,b (,a))))
-    (is equal `(,a ,b)           (macroexpand `(->> ,b ,a)))
-    (is equal `(,a (,b ,c))      (macroexpand `(->> ,c (,b) (,a))))
-    (is equal `(,a (,b ,c))      (macroexpand `(->> ,c ,b ,a)))
-    (is equal `(,a ,b ,c)        (macroexpand `(->> ,c (,a ,b))))
-    (is equal `(,a ,b (,c ,d))   (macroexpand `(->> (,c ,d) (,a ,b))))
-    (is equal `(,a (,b (,c ,d))) (macroexpand `(->> ,d (,c) (,b) (,a))))
-    (is equal `(,a (,b (,c ,d))) (macroexpand `(->> ,d ,c ,b ,a))))
-  (is string= "Hello, World!"    (->> "world!" (format nil "hello, ~a") string-capitalize)))
-
-(define-test (macro-test "-<>")
-  (true (null (-<>)))
-  (let ((a (gensym))
-        (b (gensym))
-        (c (gensym))
-        (d (gensym)))
-    (is eq a (-<> a))
-    (is equal `(,a ,b)           (macroexpand `(-<> ,b (,a))))
-    (is equal `(,a ,b)           (macroexpand `(-<> ,b ,a)))
-    (is equal `(,a (,b ,c))      (macroexpand `(-<> ,c (,b) (,a))))
-    (is equal `(,a (,b ,c))      (macroexpand `(-<> ,c ,b ,a)))
-    (is equal `(,a ,b ,c)        (macroexpand `(-<> ,b (,a ,c))))
-    (is equal `(,a (,b (,c ,d))) (macroexpand `(-<> ,d (,c) (,b) (,a))))
-    (is equal `(,a (,b (,c ,d))) (macroexpand `(-<> ,d ,c ,b ,a)))
-    (is equal `(,a (,b ,c) ,d)   (macroexpand `(-<> ,c (,b) (,a ,d)))))
-  (is equal 69                   (-<> 489 (- 420)))
-  (is string= "HELLO"            (-<> "Hello World!" (subseq 0 5) string-upcase)))

tests/main.lisp

@@ -1,26 +0,0 @@
-;;; main.lisp - 2025-02-20
-
-;; Copyright (C) 2025 Aryadev Chavali
-
-;; This program is distributed in the hope that it will be useful, but WITHOUT
-;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-;; FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
-;; details.
-
-;; You may distribute and modify this code under the terms of the GNU General
-;; Public License Version 2, which you should have received a copy of along with
-;; this program.  If not, please go to <https://www.gnu.org/licenses/>.
-
-
-;;; Code:
-
-(defpackage cantedraw/tests/main
-  (:use :cl :parachute))
-
-(in-package :cantedraw/tests/main)
-
-(define-test all
-  :serial t
-  :depends-on ((cantedraw/tests/macros macro-test)
-               (cantedraw/tests/functions function-test)
-               (cantedraw/tests/model model-test)))

tests/model.lisp

@@ -1,65 +0,0 @@
-;;; model.lisp - 2025-02-21
-
-;; Copyright (C) 2025 Aryadev Chavali
-
-;; This program is distributed in the hope that it will be useful, but WITHOUT
-;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-;; FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
-;; details.
-
-;; You may distribute and modify this code under the terms of the GNU General
-;; Public License Version 2, which you should have received a copy of along with
-;; this program.  If not, please go to <https://www.gnu.org/licenses/>.
-
-;;; Code:
-
-(defpackage cantedraw/tests/model
-  (:use
-   :cl :parachute
-   :cantedraw.lib.macros :cantedraw.lib.functions
-   :cantedraw.model))
-
-(in-package :cantedraw/tests/model)
-
-(define-test model-test)
-
-(define-test (model-test int->rank)
-  :depends-on ((cantedraw/tests/macros ->>)
-               (cantedraw/tests/functions rev-map))
-  :compile-at :execute
-  (fail (int->rank nil))
-  (fail (int->rank "Not a number"))
-  ;; Proving int->rank maps 0-51 to produces 13 ranks, all equally distributed.
-  (let ((mapping (rev-map #'int->rank (range 0 52))))
-    ;; Prove there are 13 ranks
-    (is eq 13 (length mapping))
-    ;; Prove every rank is equivalent in length.
-    (is eq 1 (->> mapping
-                  (mapcar ($>> cdr length))
-                  remove-duplicates
-                  length))
-    ;; Prove Ace, 2, ..., 10, Jack, Queen, King are the 13 ranks.
-    (true (every #'identity
-             (->> (list :ace :king :queen :jack)
-                  (append (range 2 11))
-                  (mapcar (lambda (rank) (assoc rank mapping))))))))
-
-(define-test (model-test int->suit)
-  :depends-on ((cantedraw/tests/macros ->>)
-               (cantedraw/tests/functions rev-map))
-  :compile-at :execute
-  (fail (int->suit nil))
-  (fail (int->suit "Not a number"))
-  ;; Proving int->suit splits 0-51 perfectly between the 4 suits
-  (let ((mapping (rev-map #'int->suit (range 0 53))))
-    (is eq 5 (length mapping))
-    (let ((spades   (alist-val :spades mapping))
-          (hearts   (alist-val :hearts mapping))
-          (clubs    (alist-val :clubs mapping))
-          (diamonds (alist-val :diamonds mapping))
-          (jokers   (alist-val :joker mapping)))
-      (is eq 1 (length jokers))
-      (is eq 1 (->> (list spades hearts clubs diamonds)
-                    (mapcar #'length)
-                    remove-duplicates
-                    length)))))

tests/test.lisp

@@ -0,0 +1,329 @@
+;;; test.lisp - 2025-03-01
+
+;; Copyright (C) 2025 Aryadev Chavali
+
+;; This program is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+;; FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
+;; details.
+
+;; You may distribute and modify this code under the terms of the GNU General
+;; Public License Version 2, which you should have received a copy of along with
+;; this program.  If not, please go to <https://www.gnu.org/licenses/>.
+
+;; Packages
+
+(defpackage cantedraw/tests/main
+  (:use :cl :parachute))
+
+(defpackage cantedraw/tests/macros
+  (:use :cl :parachute
+        :cantedraw.lib.macros))
+
+(defpackage cantedraw/tests/functions
+  (:use :cl :parachute
+        :cantedraw.lib.macros :cantedraw.lib.functions))
+
+(defpackage cantedraw/tests/model
+  (:use :cl :parachute
+        :cantedraw.lib.macros :cantedraw.lib.functions
+        :cantedraw.model))
+
+;; Implementations
+
+;;; main
+(in-package :cantedraw/tests/main)
+
+(define-test all
+  :serial t
+  :depends-on ((cantedraw/tests/macros macro-test)
+               (cantedraw/tests/functions function-test)
+               (cantedraw/tests/model model-test)))
+
+;;; macros
+(in-package :cantedraw/tests/macros)
+
+(define-test macro-test)
+
+(define-test (macro-test "-->")
+  (true (null          (--> x)))
+  (is eq 'a            (--> x 'a))
+  (is eq 2             (--> x 1 (1+ x)))
+  (is eq 2             (--> x 1 1+))
+  (is string= "World!" (--> _ "Hello" (format nil "~a World!" _) (subseq _ 6))))
+
+(define-test (macro-test "->>")
+  (true (null (->>)))
+  (let ((a (gensym))
+        (b (gensym))
+        (c (gensym))
+        (d (gensym)))
+    (is eq a (->> a))
+    (is equal `(,a ,b)           (macroexpand `(->> ,b (,a))))
+    (is equal `(,a ,b)           (macroexpand `(->> ,b ,a)))
+    (is equal `(,a (,b ,c))      (macroexpand `(->> ,c (,b) (,a))))
+    (is equal `(,a (,b ,c))      (macroexpand `(->> ,c ,b ,a)))
+    (is equal `(,a ,b ,c)        (macroexpand `(->> ,c (,a ,b))))
+    (is equal `(,a ,b (,c ,d))   (macroexpand `(->> (,c ,d) (,a ,b))))
+    (is equal `(,a (,b (,c ,d))) (macroexpand `(->> ,d (,c) (,b) (,a))))
+    (is equal `(,a (,b (,c ,d))) (macroexpand `(->> ,d ,c ,b ,a))))
+  (is string= "Hello, World!"    (->> "world!" (format nil "hello, ~a") string-capitalize)))
+
+(define-test (macro-test "-<>")
+  (true (null (-<>)))
+  (let ((a (gensym))
+        (b (gensym))
+        (c (gensym))
+        (d (gensym)))
+    (is eq a (-<> a))
+    (is equal `(,a ,b)           (macroexpand `(-<> ,b (,a))))
+    (is equal `(,a ,b)           (macroexpand `(-<> ,b ,a)))
+    (is equal `(,a (,b ,c))      (macroexpand `(-<> ,c (,b) (,a))))
+    (is equal `(,a (,b ,c))      (macroexpand `(-<> ,c ,b ,a)))
+    (is equal `(,a ,b ,c)        (macroexpand `(-<> ,b (,a ,c))))
+    (is equal `(,a (,b (,c ,d))) (macroexpand `(-<> ,d (,c) (,b) (,a))))
+    (is equal `(,a (,b (,c ,d))) (macroexpand `(-<> ,d ,c ,b ,a)))
+    (is equal `(,a (,b ,c) ,d)   (macroexpand `(-<> ,c (,b) (,a ,d)))))
+  (is equal 69                   (-<> 489 (- 420)))
+  (is string= "HELLO"            (-<> "Hello World!" (subseq 0 5) string-upcase)))
+
+;;; functions
+(in-package :cantedraw/tests/functions)
+
+(define-test function-test)
+
+(define-test (function-test "parse-integer*")
+  :compile-at :execute
+  (is eq 2    (parse-integer* "2"))
+  (is eq 2048 (parse-integer* "2048abcdef"))
+  (is eq nil    (parse-integer* "a2048abcdef"))
+  (is eq nil    (parse-integer* "garbage"))
+  (fail       (parse-integer* nil)))
+
+(define-test (function-test range)
+  :compile-at :execute
+  (fail (range :start 1 :end 0))
+  (fail (range :start nil :end nil))
+  (fail (range :start "a" :end "b"))
+  (true (null (range :start 1 :end 1)))
+  (is equal '(1 2 3 4)    (range :start 1 :end 5))
+  (is equal '(-3 -2 -1 0) (range :start -3 :end 1)))
+
+(define-test (function-test split)
+  :compile-at :execute
+  (fail (split nil nil))
+  (fail (split 100 nil))
+  (fail (split nil 100))
+  (is-values (split 0 '(1 2 3 4))
+    (eq nil)
+    (equal '(1 2 3 4)))
+  (is-values (split 1 '(1 2 3 4))
+    (equal '(1))
+    (equal '(2 3 4)))
+  (is-values (split 5 "Hello World")
+    (string= "Hello")
+    (string= " World")))
+
+(define-test (function-test rev-map)
+  :depends-on (range
+               (cantedraw/tests/macros ->>))
+  :compile-at :execute
+  (fail (rev-map nil nil))
+  (fail (rev-map "a string" "another string" :key-eq "not a function"))
+  (true (->> nil (rev-map #'identity) null))
+  (let ((res (rev-map #'evenp (range :start 1 :end 7))))
+    (false (null res))
+    (is equal 2 (length res))
+    (is equal 3 (->> (assoc t res) cdr length))
+    (is equal 3 (->> (assoc nil res) cdr length))
+    (true (->> (assoc t res) cdr (every #'evenp)))
+    (true (->> (assoc nil res) cdr (every #'oddp))))
+  (let* ((mod* (lambda (n) (mod n 3)))
+         (res (rev-map mod* (range :start 1 :end 12))))
+    (false (null res))
+    (is equal 3 (length res))
+    (is equal 3 (->> (assoc 0 res) cdr length))
+    (is equal 4 (->> (assoc 1 res) cdr length))
+    (is equal 4 (->> (assoc 2 res) cdr length))
+    (true (->> (assoc 0 res) cdr (every (lambda (x) (= (mod x 3) 0)))))
+    (true (->> (assoc 1 res) cdr (every (lambda (x) (= (mod x 3) 1)))))
+    (true (->> (assoc 2 res) cdr (every (lambda (x) (= (mod x 3) 2))))))
+  (let ((res (rev-map #'identity "lots of letters")))
+    (false (null res))
+    (is equal 2 (->> (assoc #\l res) cdr length))
+    (is equal 3 (->> (assoc #\t res) cdr length))
+    (is equal 2 (->> (assoc #\space res) cdr length))
+    (is equal 2 (->> (assoc #\s res) cdr length))))
+
+(define-test (function-test remove-at-indices)
+  :depends-on (range)
+  :compile-at :execute
+  (fail (remove-at-indices "a string" "another string"))
+  (true (null (remove-at-indices nil nil)))
+  (is equal '(1 2 3) (remove-at-indices nil '(1 2 3)))
+  (is equal '(2) (remove-at-indices '(0 2) '(1 2 3)))
+  (let* ((inp (range :start 100 :end 200))
+         (t1 (remove-at-indices (range :start 0 :end 100 :step 2) inp))
+         (t2 (remove-at-indices (range :start 1 :end 100 :step 2) inp)))
+    (is equal 50 (length t1))
+    (is equal 50 (length t2))
+    (true (every (lambda (n) (not (member n t2))) t1))
+    (true (every (lambda (n) (not (member n t1))) t2)))
+  (let* ((indices (list 0 5 6 7 8 9 10))
+         (str-lst (remove-at-indices indices "Hello World"))
+         (ret (coerce str-lst 'string)))
+    (is string= "ello" ret)))
+
+
+;;; model
+(in-package :cantedraw/tests/model)
+
+(define-test model-test)
+
+(define-test (model-test int->rank)
+  :depends-on ((cantedraw/tests/macros ->>)
+               (cantedraw/tests/functions rev-map))
+  :compile-at :execute
+  (fail (int->rank nil))
+  (fail (int->rank "Not a number"))
+  ;; Proving int->rank maps 0-51 to produces 13 ranks, all equally distributed.
+  (let ((mapping (rev-map #'int->rank (range :start 0 :end 52))))
+    ;; Prove there are 13 ranks
+    (is eq 13 (length mapping))
+    ;; Prove every rank is equivalent in length.
+    (is eq 1 (->> mapping
+                  (mapcar ($>> cdr length))
+                  remove-duplicates
+                  length))
+    ;; Prove Ace, 2, ..., 10, Jack, Queen, King are the 13 ranks.
+    (true (every #'identity
+             (->> (list :ace :king :queen :jack)
+                  (append (range :start 2 :end 11))
+                  (mapcar (lambda (rank) (assoc rank mapping))))))))
+
+(define-test (model-test rank->int)
+  :depends-on ((cantedraw/tests/macros ->>))
+  :compile-at :execute
+  (fail (rank->int nil))
+  (fail (rank->int 1738))
+  (fail (rank->int "not a rank"))
+  (fail (rank->int :still-not-a-rank))
+  ;; Prove ranks are mapped to unique positive integers
+  (let ((res (->> (list :jack :queen :king :ace)
+                  (append (range :start 2 :end 11))
+                  (mapcar #'rank->int))))
+    (true (every #'integerp res))
+    (true (every #'(lambda (x) (<= 0 x)) res))
+    (is equal (length res) (length (remove-duplicates res)))))
+
+(define-test (model-test "int->rank and rank->int are complete inverses")
+  :depends-on (rank->int int->rank)
+  (let ((int-range (range :start 0 :end 13))
+        (rank-range (->> (list :ace :jack :queen :king)
+                         (append (range :start 2 :end 11)))))
+    (is equal rank-range
+        (mapcar ($>> rank->int int->rank) rank-range))
+    (is equal int-range
+        (mapcar ($>> int->rank rank->int) int-range))))
+
+(define-test (model-test int->suit)
+  :depends-on ((cantedraw/tests/macros ->>)
+               (cantedraw/tests/functions rev-map))
+  :compile-at :execute
+  (fail (int->suit nil))
+  (fail (int->suit "Not a number"))
+  ;; Proving int->suit splits 0-51 perfectly between the 4 suits
+  (let ((mapping (rev-map #'int->suit (range :start 0 :end 53))))
+    (is eq 5 (length mapping))
+    (let ((spades   (alist-val :spades mapping))
+          (hearts   (alist-val :hearts mapping))
+          (clubs    (alist-val :clubs mapping))
+          (diamonds (alist-val :diamonds mapping))
+          (jokers   (alist-val :joker mapping)))
+      (is eq 1 (length jokers))
+      (is eq 1 (->> (list spades hearts clubs diamonds)
+                    (mapcar #'length)
+                    remove-duplicates
+                    length)))))
+
+(define-test (model-test suit->int)
+  :depends-on ((cantedraw/tests/macros ->>))
+  :compile-at :execute
+  (fail (suit->int nil))
+  (fail (suit->int "not a suit"))
+  (fail (suit->int :still-not-a-suit))
+  (fail (suit->int 42069))
+  ;; Prove suits are mapped to unique positive integers
+  (let ((res (->> (list :diamonds :clubs :hearts :spades :joker)
+                  (mapcar #'suit->int))))
+    (true (every #'integerp res) "All integers")
+    (true (every ($>> (<= 0)) res) "All positive")
+    (is equal (length res) (length (remove-duplicates res)) "Unique mapping")))
+
+(define-test (model-test "int->suit and suit->int are complete inverses")
+  :depends-on (suit->int int->suit)
+  (let ((int-range (list 0 13 26 39 52))
+        (suit-range (list :diamonds :clubs :hearts :spades :joker)))
+    (is equal suit-range
+        (mapcar ($>> suit->int int->suit) suit-range))
+    (is equal int-range
+        (mapcar ($>> int->suit suit->int) int-range))))
+
+(define-test (model-test int->card)
+  :depends-on ((cantedraw/tests/functions range))
+  :compile-at :execute
+  (fail (int->card nil))
+  (fail (int->card "Not a number"))
+  ;; Proving int->card maps 0-51 to exactly 52 unique cards
+  (let ((mapping (mapcar #'int->card (range :start 0 :end 52))))
+    (is eq 52 (length (remove-duplicates mapping :test #'equal))
+        "52 unique elements.")
+    (true (every #'card-p mapping)
+          "Every element is a card."))
+  ;; Prove that cards outside of [0, 51] are mapped to jokers (not exhaustive)
+  (loop :for positive :from 100 :to 200
+        :for negative :from -200 :to -100
+        :for inp := (mapcar #'int->card (list positive negative))
+        :do (true (every #'card-p inp)
+                  "Is a card.")
+        :do (true (every (lambda (c) (eq :joker (card-suit c))) inp)
+                  "Are jokers.")))
+
+(define-test (model-test card->int)
+  :depends-on ((cantedraw/tests/functions range))
+  :compile-at :execute
+  (fail (card->int nil))
+  (fail (card->int 1738))
+  (fail (card->int "not a card"))
+  (fail (card->int :still-not-a-card))
+  (let ((ranks (append (range :start 2 :end 11) (list :jack :queen :king :ace))))
+    (let ((res (->> (loop :for suit :in (list :diamonds :clubs :hearts :spades)
+                          :nconc
+                          (mapcar (lambda (rank) (make-card :rank rank :suit suit)) ranks))
+                    (mapcar #'card->int))))
+      (true (every #'integerp res) "Every mapped element is an integer.")
+      (true (every #'(lambda (x) (<= 0 x)) res) "Every mapped element is positive")
+      (is eq (length res) (length (remove-duplicates res))
+          "All mapped integers are unique."))
+    (let ((res (->> (loop :for rank :in ranks
+                          :collect (make-card :rank rank :suit :joker))
+                    (mapcar #'card->int))))
+      (true (every #'integerp res) "Every mapped element is an integer.")
+      (true (every (lambda (n) (or (< n 0) (> n 51))) res)
+            "Every mapped element is outside of [0,51]")
+      (is eq (length res) (length (remove-duplicates res))
+          "All mapped integers are unique."))))
+
+(define-test (model-test "int->card and card->int are complete inverses")
+  :depends-on (card->int int->card)
+  (let ((int-range (range :start 0 :end 52))
+        (card-range
+          (loop :for rank :in (append (range :start 2 :end 11) (list :ace :king :jack :queen))
+                :nconcing (-<> (lambda (suit) (make-card :rank rank :suit suit))
+                               (mapcar (list :Diamonds :Clubs :Hearts :Spades)))
+                  :into Y
+                :finally (return (sort Y #'card<)))))
+    (is equalp card-range (mapcar ($>> card->int int->card) card-range)
+        "int->card(card->int s) = s")
+    (is equalp int-range (mapcar ($>> int->card card->int) int-range)
+        "card->int(int->card i) = i")))