namespace_from can derrive from multiple extensions, replacing updating namespace manually

_src/build.py

@@ -32,16 +32,24 @@ def template_for(path: str) -> str:
     
     return template_data
 
-def namespace_from(extension: type) -> dict:
-    """Generates global namespace for evaluation from provided class (extension)
+def namespace_from(*extensions) -> dict:
+    """Generates global namespace for evaluation derrived from provided
+    extensions, which can be any iterable object or class.
     __builtins__ is empty by default, but can be overrided by extension
     """
     
     namespace = {'__builtins__': {}}
-    extension = vars(extension)
-    for i in extension.keys():
-        if i.startswith('_') and i != '__builtins__': continue
-        namespace[i] = extension[i]
+    
+    for extension in extensions:
+        if type(extension) == type: # extract items from class
+            extension = vars(extension)
+            for i in extension.keys():
+                if i.startswith('_') and i != '__builtins__': continue
+                namespace[i] = extension[i]
+        
+        else: # iterables
+            namespace.update(extension)
+    
     return namespace
 
 def evaluate_this(content: str, global_ns: dict, local_ns: dict = {}) -> str:
@@ -194,20 +202,25 @@ if __name__ == '__main__':
         item = Item(path)
         
         # parse content
-        namespace = namespace_from(apis.Content)
-        namespace.update(config['variables'])
-        namespace['path'] = item.path
-        namespace.update(item.frontmatter_data)
+        namespace = namespace_from(
+            {'path': path},
+            apis.Content,
+            config['variables'],
+            item.frontmatter_data
+        )
+        
         content = evaluate_this(item.content, namespace)
         
         # load template
         if template := template_for(path):
-            # apply template
-            namespace = namespace_from(apis.Content)
-            namespace.update(config['variables'])
-            namespace['path'] = item.path
-            namespace.update(item.frontmatter_data)
-            namespace['content'] = content
+            # apply template            
+            namespace = namespace_from(
+                {'path': path},
+                apis.Content,
+                config['variables'],
+                item.frontmatter_data,
+                {'content': content}
+            )
             content = evaluate_this(template, namespace)
         
         # do redirections

_src/files.py

@@ -2,7 +2,7 @@ import os
 
 cache = {} # globally shared object to store file content
 
-def read_this(path: str):
+def read_this(path: str) -> str:
     """Reads data from the file
     This function uses cache to minimize I/O
     """

_src/item.py

@@ -6,7 +6,7 @@ from attrdict import AttrDict # from itself
 
 class Item(AttrDict):
     """This class represents single content file
-    It extracts some pre-defined frontmatter fields using python-frontmatter module"""
+    It extracts all frontmatter fields using python-frontmatter module"""
     
     title = None
     tags = []