change month and day order as in jekyl

app/models/post.rb

@@ -6,11 +6,11 @@ class Post
   def initialize(path)
     @dir = File.dirname(path)
     base , @ext = File.basename(path).split(".")
-    raise "must be partial, statr with _ not:#{base}" unless base[0] == "_"
+    raise "must be partial, start with _ not:#{base}" unless base[0] == "_"
     @words = base.split("-")
     @year = parse_int(@words.shift[1 .. -1] , 2100)
-    @day = parse_int(@words.shift , 32)
     @month = parse_int(@words.shift , 12)
+    @day = parse_int(@words.shift , 32)
     raise "Invalid path #{path}" unless @words
   end
 
@@ -24,7 +24,7 @@ class Post
     "#{date}-#{@words.join("-")}"
   end
   def date
-    "#{year}-#{day}-#{month}"
+    "#{year}-#{month}-#{day}"
   end
   def parse_int( value , max)
     ret = value.to_i

app/views/posts/_2014-9-12-register-allocation-reviewed.haml

@@ -0,0 +1,71 @@
+%p The time of introspection is coming to an end and i am finally producing executables again. (hurrah)
+%h3#blockandexception Block and exception
+%p
+  Even neither ruby blocks or exceptions are implemented i have figured out how to do it, which is sort of good news.
+  I'll see off course when the day comes, but a plan is made and it is this:
+%p No information lives on the machine stack.
+%p
+  Maybe it's easier to understand this way: All objects live in memory primarily. Whatever get's moved onto the machine
+  stack is just a copy and, for purposes of the gc, does not need to be considered.
+%h3#4objects4registers 4 Objects, 4 registers
+%p As far as i have determined the vm needs internal access to exactly four objects. These are:
+%ul
+  %li Message: the currently received one, ie the one that in a method led to the method being called
+  %li Self: this is an instance variable of the message
+  %li Frame: local and temporary variables of the method. Also part of the message.
+  %li NewMessage: where the next call is prepared
+%p And, as stated above, all these objects live in memory.
+%h3#singlesetinstruction Single Set Instruction
+%p
+  Self and frame are duplicated information, because then it is easier to transfer. After inital trying, i settle on a
+  single Instruction to move data around in the vm, Set. It can move instance variables from any of the objects to any
+  other of the 4 objects.
+%p
+  The implementation of Set ensures that any move to the self slot in Message gets duplicated into the Self register. Same
+  for the frame, but both are once per method occurances, and both are read only afterwards, so don't need updating later.
+%p Set, like other instructions may use any other variables at any time. Those registers (r4 and up) are scratch.
+%h3#simplecall Simple call
+%p
+  This makes calling relatively simple and thus easy to understand. To make a call we must be in a method, ie Message,
+  Self and Frame have been set up.
+%p
+  The method then produces values for the call. This involves operations and the result of that is stored in a variable
+  (tmp/local/arg). When all values have been calculated a NewMessage is created and all data moved there (see Set)
+%p
+  A Call is then quite simple: because of the duplication of Self and Frame, we only need to push the Message to the
+  machine stack. Then we move the NewMessage to Message, unroll (copy) the Self into it's register and assign a new
+  Frame.
+%p
+  Returning is also not overly complicated: Remembering that the return value is an instance variable in the
+  Message object. So when the method is done, the value is there, not for example in a dedicated register.
+  So we need to undo the above: move the current Message to NewMessage, pop the previously pushed message from the
+  machine stack and unroll the Self and Frame copies.
+%p
+  The caller then continues and can pick up the return from it's NewMessage if it is used for further calculation.
+  It's like it did everything to built the (New)Message and immediately the return value was filled in.
+%p
+  As I said, often we need to calculate the values for the call, so we need to make calls. This happens in exacly the same
+  way, and the result is shuffled to a Frame slot (local or temporary variable).
+%h3#messagecreation Message creation
+%p
+  Well, i hear, that sounds good and almost too easy. But .... (always one isn't there) what about the Message and Frame
+  objects, where do you get those from ?
+%p
+  And this is true: in c the Message does not exist, it's just data in registers and the Frame is created on the stack if
+  needed.
+%p And unfortunately we can't really make a call to get/create these objects as that would create an endless loop. Hmm
+%p We need a very fast way to create and reuse these objects: a bit like a stack. So let's just use a Stack :-)
+%p
+  Off course not the machine stack, but a Stack object. An array to which we append and take from.
+  It must be global off course, or rather accessible from compiling code. And fast may be that we use assembler, or
+  if things work out well, we can use the same code as what makes builtin arrays tick.
+%p
+  Still, this is a different problem and the full solution will need a bit time. But clearly it is solvable and does
+  not impact above register usage convention.
+%h3#thefineprint The fine-print
+%p
+  Just for the sake of completeness: The assumption i made a the beginning of the Simple Call section, can off course not
+  possibly be always true.
+%p
+  To boot the vm, we must create the first message by "magic" and place it and the Self (Kernel module reference).
+  As it can be an empty Message for now, this is not difficult, just one of those little gotachs.

spec/models/blog_spec.rb

@@ -27,8 +27,8 @@ RSpec.describe Post, type: :model do
     end
     it "returns dates" do
       expect(@post.year).to eq 1993
-      expect(@post.month).to eq 4
+      expect(@post.day).to eq 4
-      expect(@post.day).to eq 2
+      expect(@post.month).to eq 2
     end
     it "returns date" do
       expect(@post.date).to eq "1993-2-4"