diff --git a/src/coleslaw.lisp b/src/coleslaw.lisp
index 552c06e..9269d12 100644
--- a/src/coleslaw.lisp
+++ b/src/coleslaw.lisp
@@ -9,11 +9,17 @@ If ARGS is provided, use (apply 'format nil PATH ARGS) as the value of PATH."
   "Convert an iolib file-path back to a pathname."
   (merge-pathnames (file-path-namestring file) parent))
 
-(defmacro do-files ((var path) &body body)
-  "For each file under PATH, run BODY."
-  `(iolib.os:mapdir (lambda (x)
-                      (let ((,var (to-pathname x ,path)))
-                        ,@body)) ,path))
+(defmacro do-files ((var path &optional extension) &body body)
+  "For each file under PATH, run BODY. If EXTENSION is provided, only run BODY
+on files that match the given extension."
+  (alexandria:with-gensyms (ext)
+    `(iolib.os:mapdir (lambda (x)
+                        (let* ((,var (to-pathname x ,path))
+                               ,@(when extension `((,ext (pathname-type ,var)))))
+                          ,@(if extension
+                                `((when (and ,ext (string= ,ext ,extension))
+                                     ,@body))
+                                `,body))) ,path)))
 
 (defun compile-blog ()
   (let ((staging #p"/tmp/coleslaw/"))
diff --git a/src/posts.lisp b/src/posts.lisp
index b0e311e..52cbf69 100644
--- a/src/posts.lisp
+++ b/src/posts.lisp
@@ -1,34 +1,38 @@
 (in-package :coleslaw)
 
+(defparameter *metadata* (make-hash-table :test #'equal))
+
 (defclass post ()
-  ((id :initform nil :initarg :id
-       :accessor post-id)
-   (title :initform nil :initarg :title
-          :accessor post-title)
-   (tags :initform nil :initarg :tags
-         :accessor post-tags)
-   (date :initform nil :initarg :date
-         :accessor post-date)
-   (content :initform nil :initarg :content
-            :accessor post-content)
-   (aliases :initform nil :initarg :aliases
-            :accessor post-aliases)))
+  ((slug :initform nil :initarg :slug :accessor post-slug)
+   (title :initform nil :initarg :title :accessor post-title)
+   (tags :initform nil :initarg :tags :accessor post-tags)
+   (date :initform nil :initarg :date :accessor post-date)
+   (format :initform nil :initarg :format :accessor post-format)
+   (content :initform nil :initarg :content :accessor post-content)
+   (aliases :initform nil :initarg :aliases :accessor post-aliases)))
 
-(defgeneric make-post (title tags date content
-                       &key id aliases &allow-other-keys)
-  (:documentation "Create a POST with the given data."))
+(defun render-posts ()
+  (do-files (file (repo *config*) "post")
+    (with-open-file (in file)
+      (let ((post (read-post in)))
+        (setf (gethash (post-slug post) *metadata*) post)))
+    (maphash #'write-post *metadata*)))
 
-(defgeneric add-post (post id)
-  (:documentation "Insert a post into *storage* with the given ID."))
+(defun read-post (stream)
+  "Make a POST instance based on the data from STREAM."
 
-(defgeneric remove-post (id)
-  (:documentation "Remove a post from *storage* matching ID."))
+  )
 
-(defgeneric render-post (id)
-  (:documentation "Generate the final HTML for the post with given ID."))
-
-(defgeneric find-post (id)
-  (:documentation "Retrieve a post from *storage* matching ID."))
-
-(defgeneric post-url (id)
-  (:documentation "Return the URL for the post with the given ID."))
+(defun write-post (slug post)
+  "Write out the HTML for POST in SLUG.html."
+  (with-open-file (out (format nil "~a.html" slug)
+                       :direction :output
+                       :if-does-not-exist :create)
+    (let ((content (funcall (theme-fn "POST")
+                            (list :title (post-title post)
+                                  :tags (post-tags post)
+                                  :date (post-date post)
+                                  :content (post-content post)
+                                  :prev nil
+                                  :next nil))))
+      (write content out))))
diff --git a/src/themes.lisp b/src/themes.lisp
index 4af27bf..7857bb2 100644
--- a/src/themes.lisp
+++ b/src/themes.lisp
@@ -1,19 +1,24 @@
 (in-package :coleslaw)
 
+(defparameter *injections* (make-hash-table :test #'equal))
+
 (defgeneric add-injection (str location)
-  (:documentation "Add STR to the list of elements injected in LOCATION."))
+  (:documentation "Add STR to the list of elements injected in LOCATION.")
+  (:method ((str string) location)
+    (pushnew str (gethash location *injections*) :test #'string=)))
 
 (defgeneric remove-injection (str location)
-  (:documentation "Remove STR from the list of elements injected in LOCATION."))
+  (:documentation "Remove STR from the list of elements injected in LOCATION.")
+  (:method ((str string) location)
+    (setf (gethash location *injections*)
+          (remove str (gethash location *injections*) :test #'string=))))
 
 (defun theme-package (&key (name (theme *config*)))
   (find-package (string-upcase (concatenate 'string "coleslaw.theme." name))))
 
 (defun compile-theme (&key (theme-dir (app-path "themes/~a/" (theme *config*))))
-  (do-files (file theme-dir)
-    (let ((extension (pathname-type file)))
-      (when (and extension (string= extension "tmpl"))
-        (compile-template :common-lisp-backend file)))))
+  (do-files (file theme-dir "tmpl")
+    (compile-template :common-lisp-backend file)))
 
 ;; DOCUMENTATION
 ;; A theme directory should be named after the theme and contain *.tmpl files