Merge branch 'feature/augment-undo' into develop

CHANGES.md

@@ -1,3 +1,8 @@
+## v0.4.0  (2015-04-24)
+
+Improvements:
+  - #52 Add a way to purge redos
+  
 
 ## v0.3.2  (2015-04-21)
 

examples/simple/project.clj

@@ -1,9 +1,9 @@
 
-(defproject simple-re-frame "0.3.2"
+(defproject simple-re-frame "0.4.0.SNAPSHOT"
   :dependencies [[org.clojure/clojure "1.6.0"]
                  [org.clojure/clojurescript "0.0-3208"]
                  [reagent "0.5.0"]
-                 [re-frame "0.3.2"]
+                 [re-frame "0.4.0.SNAPSHOT"]
                  [figwheel "0.2.6"]]
 
   :plugins [[lein-cljsbuild "1.0.5"]

examples/todomvc/project.clj

@@ -1,8 +1,8 @@
-(defproject todomvc-re-frame "0.3.2"
+(defproject todomvc-re-frame "0.4.0.SNAPSHOT"
   :dependencies [[org.clojure/clojure "1.6.0"]
                  [org.clojure/clojurescript "0.0-3208"]
                  [reagent "0.5.0"]
-                 [re-frame "0.3.2"]
+                 [re-frame "0.4.0.SNAPSHOT"]
                  [secretary "1.2.3"]]
 
   :plugins [[lein-cljsbuild "1.0.5"]]

project.clj

@@ -1,9 +1,9 @@
-(defproject re-frame "0.3.2"
+(defproject re-frame "0.4.0.SNAPSHOT"
   :description  "A Clojurescript MVC-like Framework For Writing SPAs Using Regent."
   :url          "https://github.com/Day8/re-frame.git"
   :license      {:name "MIT"}
   :dependencies [[org.clojure/clojure "1.6.0"]
-                 [org.clojure/clojurescript "0.0-3208"]
+                 [org.clojure/clojurescript "0.0-3211"]
                  [org.clojure/core.async "0.1.346.0-17112a-alpha"]
                  [reagent "0.5.0"]]
   

src/re_frame/undo.cljs

@@ -30,21 +30,29 @@
 (def ^:private undo-explain-list (reagent/atom []))   ;; mirrors undo-list
 (def ^:private redo-explain-list (reagent/atom []))   ;; mirrors redo-list
 
+(defn- clear-undos!
+  []
+  (reset! undo-list [])
+  (reset! undo-explain-list []))
+
+
+(defn- clear-redos!
+  []
+  (reset! redo-list [])
+  (reset! redo-explain-list []))
+
 
 (defn clear-history!
   []
-  (reset! undo-list [])
-  (reset! redo-list [])
-  (reset! undo-explain-list [])
-  (reset! redo-explain-list [])
+  (clear-undos!)
+  (clear-redos!)
   (reset! app-explain ""))
 
 
 (defn store-now!
   "stores the value currently in app-db, so the user can later undo"
   [explanation]
-  (reset! redo-list [])           ;; clear and redo state created by previous undos
-  (reset! redo-explain-list [])   ;; clear and redo state created by previous undos
+  (clear-redos!)
   (reset! undo-list (vec (take
                            @max-undos
                            (conj @undo-list @app-db))))
@@ -53,6 +61,7 @@
                                    (conj @undo-explain-list @app-explain))))
   (reset! app-explain explanation))
 
+
 (defn undos?
   []
   (pos? (count @undo-list)))
@@ -119,9 +128,9 @@
     (recur (dec n))))
 
 (handlers/register-base     ;; not a pure handler
-  :undo                     ;; usage:  (dispatch [:undo n])
+  :undo                     ;; usage:  (dispatch [:undo n])  n is optional, defaults to 1
   (fn handler
-    [_ [_ n]]               ;; if n absent, defaults to 1
+    [_ [_ n]]
     (if-not (undos?)
       (warn "re-frame: you did a (dispatch [:undo]), but there is nothing to undo.")
       (undo-n (or n 1)))))
@@ -151,3 +160,12 @@
       (warn "re-frame: you did a (dispatch [:redo]), but there is nothing to redo.")
       (redo-n (or n 1)))))
 
+
+(handlers/register-base     ;; not a pure handler
+  :purge-redos              ;; usage:  (dispatch [:purge-redo])
+  (fn handler
+    [_ _]
+    (if-not (redos?)
+      (warn "re-frame: you did a (dispatch [:purge-redos]), but there is nothing to redo.")
+      (clear-redos!))))
+