Add support for atom / rss feedHEADmaster

Date format was changed to support `updated` in ISO format. Now every
post will require date and time, which might be a usability regression,
but we'll see. Also, `updated` field was introduced in metadata. If
there is no such field, them date field will be used instead.

1 files changed, 29 insertions, 21 deletions

diff --git a/blog/post.py b/blog/post.py
index 8a7c880..955724a 100644
--- a/blog/post.py
+++ b/blog/post.py
@@ -2,27 +2,23 @@ import os
 import shutil
 import datetime
 import functools
-from typing import Dict
+from typing import Dict, List
 
 from jinja2 import Template
 
+from dataclasses import dataclass
+
 import render
 
 
+@dataclass(slots=True)
 class Metadata(object):
-    __slots__ = ("title", "author", "date", "status")
     title: str
     author: str
-    date: str
+    date: datetime.datetime
+    updated: datetime.datetime
     status: str
 
-    def __init__(self, title: str, author: str,
-                 date: str, status: str) -> None:
-        self.title = title
-        self.author = author
-        self.date = date
-        self.status = status
-
 
 class Post(object):
     template: Template
@@ -52,33 +48,45 @@ class Post(object):
 
         title = raw["Title"]
         author = raw["Author"]
-        date = raw.get("Date", datetime.date.today().strftime("%Y-%m-%d"))
+        date = raw["Date"]
+        updated = raw.get("Updated", date)
         status = raw.get("Status", "draft")
 
-        return Metadata(title, author, date, status)
+        return Metadata(
+                title,
+                author,
+                datetime.datetime.fromisoformat(date),
+                datetime.datetime.fromisoformat(updated),
+                status
+        )
+
+    @functools.cached_property
+    def content(self) -> str:
+        md = None
+        for filename in os.listdir(self.directory):
+            if filename.endswith(".md"):
+                return render.to_html(os.path.join(self.directory, filename))
+        assert False, f"There is no markdown file in `{self.directory}`"
 
     def generate(self, basedir: str) -> None:
         postdir = os.path.basename(self.directory)
         workdir = os.path.join(basedir, postdir)
         os.makedirs(workdir)
 
-        md = None
         for filename in os.listdir(self.directory):
             source = os.path.join(self.directory, filename)
             destination = os.path.join(workdir, filename)
-
             shutil.copy(source, destination)
 
-            if filename.endswith(".md"):
-                md = source
-
-        assert md, f"There is no markdown file in `{self.directory}`"
-
-        content = render.to_html(md)
         rendered = self.template.render(title=self.metadata.title,
                                         author=self.metadata.author,
                                         date=self.metadata.date,
+                                        updated=self.metadata.updated,
                                         status=self.metadata.status,
-                                        content=content)
+                                        content=self.content)
         render.write_file_content(os.path.join(workdir, "index.html"),
                                   rendered)
+
+
+def remove_drafts(posts: List[Post]) -> List[Post]:
+    return list(filter(lambda x: x.metadata.status != "draft", posts))