From 02bd636e990e8e9cf2a20eaf4cd0e0f22acb0ab3 Mon Sep 17 00:00:00 2001
From: Colin Okay <okay@toyful.space>
Date: Sun, 21 Feb 2021 09:49:37 -0600
Subject: version bump

Added resumable generators
---
 gtwiwtg-test.lisp |  9 +++++++++
 gtwiwtg.asd       |  2 +-
 gtwiwtg.lisp      | 34 ++++++++++++++++++++++++++++++++++
 package.lisp      |  2 ++
 4 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/gtwiwtg-test.lisp b/gtwiwtg-test.lisp
index be79e23..80c3c86 100644
--- a/gtwiwtg-test.lisp
+++ b/gtwiwtg-test.lisp
@@ -106,6 +106,15 @@
     '(#\r #\e #\e #\r #\n))
 
 
+ (let ((res (make-resumable!
+             (concat! (seq "hello")
+                      (indexed! (filter! 'alpha-char-p (seq "a b c 1 2 3 easy as")))))))
+   (take 1 res)
+   (setf res (resume! res))
+   (is '(#\e #\l #\l #\o (0 #\a) (1 #\b) (2 #\c) (3 #\e) (4 #\a) (5 #\s) (6 #\y)
+         (7 #\a) (8 #\s)) 
+       (collect res)))
+
  )
 
 
diff --git a/gtwiwtg.asd b/gtwiwtg.asd
index 462d3ac..41f87eb 100644
--- a/gtwiwtg.asd
+++ b/gtwiwtg.asd
@@ -4,7 +4,7 @@
   :description "Lazy-ish iterators"
   :author "Colin Okay <okay@toyful.space>"
   :license  "GPLv3"
-  :version "0.1.2"
+  :version "0.2.0"
   :serial t
   :components ((:file "package")
                (:file "gtwiwtg")
diff --git a/gtwiwtg.lisp b/gtwiwtg.lisp
index 5394224..42e7731 100644
--- a/gtwiwtg.lisp
+++ b/gtwiwtg.lisp
@@ -148,6 +148,15 @@
   (stop (slot-value gen 'source-generator)))
 
 
+(a-generator-class resumable-generator! ()
+                   (wrapped (error "Resumable generators must wrap another generator")))
+
+(defmethod next ((gen resumable-generator!))
+  (next (slot-value gen 'wrapped)))
+
+(defmethod has-next-p ((gen resumable-generator!))
+  (gtwiwtg::has-next-p (slot-value gen 'wrapped)))
+
 ;;; CONSTRUCTORS
 
 (defun range (&key (from 0) to (by 1) inclusive)
@@ -360,6 +369,31 @@ The last generated value of the returned generator will be NIL.
 
 ;;; MODIFIERS and COMBINATORS
 
+(defun make-resumable! (gen)
+  "Makes a generator resumable. 
+
+> (defvar *foobar* (make-resumable! (range)))
+*FOOBAR*
+
+> (take 10 *foobar*)
+(0 1 2 3 4 5 6 7 8 9)
+
+> (setf *foobar* (resume! *foobar*))
+
+> (take 10 *foobar*)
+(10 11 12 13 14 15 16 17 18 19)
+"
+  (sully-when-clean (list gen))
+  (make-instance 'resumable-generator! :wrapped gen))
+
+(defun can-be-resumed-p (gen)
+  (and  (typep gen 'resumable-generator!)
+        (stopped-p gen)))
+
+(defun resume! (resumable)
+  (assert (can-be-resumed-p resumable))
+  (make-instance 'resumable-generator! :wrapped (slot-value resumable 'wrapped)))
+
 (defun map! (map-fn gen &rest gens)
   "Maps a function over a number of generators, returning a generator
 that produces values that result from calling MAP-FN on those
diff --git a/package.lisp b/package.lisp
index 848146d..b6efe86 100644
--- a/package.lisp
+++ b/package.lisp
@@ -15,6 +15,8 @@
            #:file-lines
            #:file-chars
            #:file-bytes
+           #:make-resumable!
+           #:resume!
            #:map!
            #:filter!
            #:inflate!
-- 
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