From cea54d7dee98f97e7ed01c9b33befc6f6b89ed22 Mon Sep 17 00:00:00 2001
From: Alexander Yakovlev <keloero@oreolek.ru>
Date: Mon, 21 Mar 2016 08:41:56 +0700
Subject: [PATCH] "Go back" functionality

---
 game/begin.coffee |  5 ++++-
 lib/salet.coffee  | 15 +++++++++++----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/game/begin.coffee b/game/begin.coffee
index a9327b9..40260e2 100644
--- a/game/begin.coffee
+++ b/game/begin.coffee
@@ -51,5 +51,8 @@ room "inventory", salet,
       for thing in salet.character.inventory
         text += "* #{salet.character.listinv(thing.name)}\n"
     return text+"\n\n"+"""
-    <div class="center"><a href="plaza"><button class="btn btn-lg btn-outline-primary">Go to plaza</button></a></div>
+    <div class="center"><a href="./exit"><button class="btn btn-lg btn-outline-primary">Go back</button></a></div>
     """
+  actions:
+    exit: (salet) ->
+      return salet.goBack()
diff --git a/lib/salet.coffee b/lib/salet.coffee
index 64071ff..d5a847b 100644
--- a/lib/salet.coffee
+++ b/lib/salet.coffee
@@ -196,6 +196,8 @@ class Salet
       seed: null
       # Keeps track of the links clicked, and when.
       sequence: [],
+      # Keeps track of the rooms visited, for when we want to "go back"
+      path: [],
       # The time when the progress was saved.
       saveTime: null
     }
@@ -295,12 +297,14 @@ class Salet
       now = (new Date()).getTime() * 0.001
       @time = now - @startTime
       @progress.sequence.push({link:code, when:@time})
+      if @getRoom(code)? # if it's a room
+        @progress.path.push(code)
       @processLink(code)
 
-    # Presumably, the last action is the one that fired goBack, so we go to the
-    # one before it.
+    # Go back N rooms. It's not an UNDO.
+    # Also, steps = 1 is the current room
     @goBack = (steps = 2) =>
-      @processClick(@progress.sequence[@progress.sequence.length - steps].link)
+      @processClick(@progress.path[@progress.path.length - steps])
 
     # Transition between rooms.
     @doTransitionTo = (newRoomId) =>
@@ -426,7 +430,10 @@ class Salet
         # Do the first state.
         @doTransitionTo(@start)
 
-    @getRoom = (name) => @rooms[name]
+    @getRoom = (name) => 
+      if @rooms[name]?
+        return @rooms[name]
+      return undefined
 
     # Just an alias for getCurrentRoom
     @here = () => @getCurrentRoom()