--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/site/loaders.py	Fri Feb 06 20:46:43 2009 +0200
@@ -0,0 +1,160 @@
+
+from __future__ import with_statement
+
+# XXX: for _HTMLPage
+import page
+import templates
+
+from pages import error404
+
+import os.path
+import imp
+
+# the page dir
+PAGE_DIR_PATH = "pages/"
+
+def build_page_path (*bits) :
+    # XXX: fix directory traversal...
+    
+    return os.path.join(PAGE_DIR_PATH, *bits)
+
+class PageLoader (object) :
+    """
+        Load Page objects from files under pages/
+    """
+    
+    # file extension, e.g. '.html' or '.py'
+    suffix = None
+
+    def __init__ (self, suffix) :
+        self.suffix = suffix
+        
+    def _build_path (self, page_path) :
+        """
+            Builds a path from base_path + page_path + suffix. Returns None if the path does not exist
+        """
+        
+        path = build_page_path(page_path) + self.suffix
+
+        if os.path.exists(path) :
+            return path
+
+        else :
+            return None
+
+    def load (self, page_path) :
+        """
+            Attempts to load the page at the given path, returns the class on success, None on failure
+        """
+        
+        abstract
+
+class _HTMLPage (page.Page) :
+    # the path to the .html file
+    file_path = None
+    
+    # parent page
+    # parent = None
+
+    def __init__ (self, *args) :
+        super(_HTMLPage, self).__init__(*args)
+
+        # open the .html and read in the contents
+        with open(self.file_path, "r") as fh :
+            self.file_data = fh.read()
+
+    def render_template (self) :
+        tpl = self._build_template(templates.layout)
+        
+        tpl.page_content = self.file_data
+        
+        return tpl
+
+class HTMLLoader (PageLoader) :
+    """
+        Static .html files that are inserted into the layout template as-is
+
+        Sub-pages are not supported...
+    """
+
+    def __init__ (self) :
+        super(HTMLLoader, self).__init__(".html")
+
+    def get_title (self, page_path) :
+        head, tail = os.path.split(page_path)
+
+        return tail.title() if tail else "Index"
+
+    def load (self, _page_path) :
+        _file_path = self._build_path(_page_path)
+        
+        # ignore if it doesn't exist
+        if not _file_path :
+            return
+        
+        # get page title
+        _title = self.get_title(_page_path)
+
+        # create a new class and return it
+        class _html_page (_HTMLPage) :
+            file_path = _file_path
+            title = _title
+            name = _title
+            path = _page_path
+            
+        # return it
+        return _html_page
+
+class PythonLoader (PageLoader) :
+    """
+        Dynamic .py files that define a Page class
+    """
+
+    def __init__ (self) :
+        super(PythonLoader, self).__init__(".py")
+    
+    def load (self, page_path) :
+        path = self._build_path(page_path)
+
+        # ignore if not exists
+        if not path :
+            return
+
+        # load the module dynamically
+        module = imp.load_source("__dyn_%d" % id(path), path)
+
+        # return the Page object
+        return module.Page
+
+# our defined loaders
+loaders = [
+    HTMLLoader(),
+    PythonLoader(),
+]
+
+def load_page (req) :
+    """
+        Returns an instance of a Page object corresponding to the given req
+    """
+
+    # page path is given in req
+    page_path = req.page_path
+
+    # if it's a dir, then add 'index'
+    if os.path.isdir(build_page_path(page_path)) :
+        page_path = os.path.join(page_path, "index")
+
+    # try each loader in turn
+    for loader in loaders :
+        page = loader.load(req.page_path)
+        
+        # found?
+        if page :
+            break
+
+    # 404 error...
+    if not page :
+        page = error404.Error404
+        
+    return page(req, req.page_path)
+