generate RSS feed

pyproject.toml

@@ -11,6 +11,7 @@ authors = [
 requires-python = ">=3.12"
 dependencies = [
   "dacite>=1.9.2",
+  "feedgen>=1.0.0",
   "jinja2>=3.1.6",
   "l2m4m>=1.0.4",
   "markdown>=3.8.2",
@@ -57,7 +58,7 @@ reportUnusedCallResult = false
 reportCallInDefaultInitializer = false
 enableTypeIgnoreComments = true
 reportIgnoreCommentWithoutRule = false
-allowedUntypedLibraries = ["frontmatter", "pygments", "pymdownx", "l2m4m"]
+allowedUntypedLibraries = ["frontmatter", "pygments", "pymdownx", "l2m4m", "feedgen", "feedgen.feed"]
 
 [tool.ruff]
 line-length = 70

src/zona/builder.py

@@ -2,6 +2,8 @@ import shutil
 from datetime import date
 from pathlib import Path
 
+from feedgen.feed import FeedGenerator
+
 from zona import markdown as zmd
 from zona import util
 from zona.config import ZonaConfig
@@ -55,7 +57,9 @@ class ZonaBuilder:
                     layout.root / "content" / "static"
                 ):
                     logger.debug(f"Parsing {path.name}.")
-                    item.metadata, item.content = parse_metadata(path)
+                    item.metadata, item.content = parse_metadata(
+                        path, config=self.config
+                    )
                     if item.metadata.ignore or (
                         item.metadata.draft
                         and not self.config.build.include_drafts
@@ -97,7 +101,45 @@ class ZonaBuilder:
                 items.append(item)
         self.items = items
 
-    def _build(self):
+    def generate_feed(self) -> bytes:
+        post_list = self._get_post_list()
+        config = self.config.feed
+        if config.link.endswith("/"):
+            config.link = config.link[:-2]
+        fg = FeedGenerator()
+        fg.id(config.link)
+        fg.title(config.title)
+        author = {
+            "name": config.author.name,
+            "email": config.author.email,
+        }
+        fg.author(author)
+        fg.link(
+            href=f"{config.link}/{config.path}",
+            rel="self",
+            type="application/rss+xml",
+        )
+        fg.language(config.language)
+        fg.description(config.description)
+
+        for post in post_list:
+            assert post.metadata
+            fe = fg.add_entry()  # pyright: ignore[reportUnknownVariableType]
+            fe.id(f"{config.link}{util.normalize_url(post.url)}")  # pyright: ignore[reportUnknownMemberType]
+            fe.link(  # pyright: ignore[reportUnknownMemberType]
+                href=f"{config.link}{util.normalize_url(post.url)}"
+            )
+            fe.title(post.metadata.title)  # pyright: ignore[reportUnknownMemberType]
+            fe.author(author)  # pyright: ignore[reportUnknownMemberType]
+            desc = post.metadata.description
+            fe.description(desc)  # pyright: ignore[reportUnknownMemberType]
+            date = post.metadata.date
+            fe.pubDate(date)  # pyright: ignore[reportUnknownMemberType]
+        out: bytes = fg.rss_str(pretty=True)  # pyright: ignore[reportUnknownVariableType]
+        assert isinstance(out, bytes)
+        return out
+
+    def _get_post_list(self) -> list[Item]:
         assert self.items
         # sort according to date
         # descending order
@@ -108,7 +150,12 @@ class ZonaBuilder:
             else date.min,
             reverse=True,
         )
+        return post_list
+
+    def _build(self):
+        post_list = self._get_post_list()
         # number of posts
+        # generate RSS here
         posts = len(post_list)
         # link post chronology
         for i, item in enumerate(post_list):
@@ -180,4 +227,9 @@ class ZonaBuilder:
         self._discover()
         logger.debug("Building...")
         self._build()
+        if self.config.feed.enabled:
+            rss = self.generate_feed()
+            path = self.layout.content / self.config.feed.path
+            util.ensure_parents(path)
+            path.write_bytes(rss)
         self.fresh = False

src/zona/config.py

@@ -1,7 +1,13 @@
+from __future__ import annotations
+
 from dataclasses import dataclass, field
+from datetime import datetime, tzinfo
 from pathlib import Path
+from typing import Any
+from zoneinfo import ZoneInfo
 
 import yaml
+from dacite import Config as DaciteConfig
 from dacite import from_dict
 
 from zona.log import get_logger
@@ -25,9 +31,17 @@ def find_config(start: Path | None = None) -> Path | None:
 SitemapConfig = dict[str, str]
 
 
+@dataclass
+class PostDefaultsConfig:
+    description: str = "A blog post"
+
+
 @dataclass
 class BlogConfig:
     dir: str = "blog"
+    defaults: PostDefaultsConfig = field(
+        default_factory=PostDefaultsConfig
+    )
 
 
 @dataclass
@@ -69,12 +83,40 @@ class ServerConfig:
     reload: ReloadConfig = field(default_factory=ReloadConfig)
 
 
+@dataclass
+class AuthorConfig:
+    name: str = "John Doe"
+    email: str = "john@doe.net"
+
+
+@dataclass
+class FeedConfig:
+    enabled: bool = True
+    timezone: tzinfo = field(default_factory=lambda: ZoneInfo("UTC"))
+    path: str = "rss.xml"
+    link: str = "https://example.com"
+    title: str = "Zona Website"
+    description: str = "My zona website."
+    language: str = "en"
+    author: AuthorConfig = field(default_factory=AuthorConfig)
+
+
 IGNORELIST = [".marksman.toml"]
 
 
+def parse_timezone(s: Any) -> tzinfo:
+    if isinstance(s, str):
+        return ZoneInfo(s)
+    else:
+        raise TypeError(
+            f"Expected {str}, got {type(s)} for config key timezone"
+        )
+
+
 @dataclass
 class ZonaConfig:
     base_url: str = "/"
+    feed: FeedConfig = field(default_factory=FeedConfig)
     # dictionary where key is name, value is url
     sitemap: SitemapConfig = field(
         default_factory=lambda: {"Home": "/"}
@@ -87,7 +129,12 @@ class ZonaConfig:
     server: ServerConfig = field(default_factory=ServerConfig)
 
     @classmethod
-    def from_file(cls, path: Path) -> "ZonaConfig":
+    def from_file(cls, path: Path) -> ZonaConfig:
         with open(path, "r") as f:
             raw = yaml.safe_load(f)
-        return from_dict(data_class=cls, data=raw)
+        config: ZonaConfig = from_dict(
+            data_class=cls,
+            data=raw,
+            config=DaciteConfig(type_hooks={tzinfo: parse_timezone}),
+        )
+        return config

src/zona/data/templates/page.html

@@ -1,8 +1,8 @@
 {% extends "base.html" %} {% block content %} {% if metadata.show_title %} {%
-include "title.html" %} {% if metadata.date %}
+include "title.html" %} {% if metadata.date.date() %}
 <center>
-  <time class="post-date" datetime="{{ metadata.date | safe }}"
-  >{{ metadata.date | safe}}</time>
+  <time class="post-date" datetime="{{ metadata.date.date() | safe }}"
+  >{{ metadata.date.date() | safe}}</time>
 </center>
 {% endif %} {% endif %} {% if is_post %} {% include "post_nav.html" %} {% endif
 %}

src/zona/data/templates/post_list.html

@@ -8,8 +8,8 @@ include "title.html" %} {% endif %}
   <ul>
     {% for item in post_list %}
     <li>
-      <time class="post-list-date" datetime="{{ item.metadata.date | safe }}"
-      >{{ item.metadata.date | safe}}</time>: <a href="/{{ item.url }}"
+      <time class="post-list-date" datetime="{{ item.metadata.date.date() | safe }}"
+      >{{ item.metadata.date.date() | safe}}</time>: <a href="/{{ item.url }}"
       >{{ item.metadata.title }}</a>
     </li>
     {% endfor %}

src/zona/metadata.py

@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from datetime import date
+from datetime import date, datetime, time, tzinfo
 from pathlib import Path
 
 import frontmatter
@@ -10,13 +10,14 @@ from dateutil import parser as date_parser
 from yaml import YAMLError
 
 import zona.util
+from zona.config import ZonaConfig
 
 
 @dataclass
 class Metadata:
     title: str
-    date: date
-    description: str | None
+    date: datetime
+    description: str
     show_title: bool = True
     show_date: bool = True
     show_nav: bool = True
@@ -30,14 +31,29 @@ class Metadata:
     math: bool = True
 
 
-def parse_date(raw_date: str | date | object) -> date:
-    if isinstance(raw_date, date):
-        return raw_date
+def ensure_timezone(dt: datetime, tz: tzinfo) -> datetime:
+    if dt.tzinfo is None or dt.utcoffset() is None:
+        dt = dt.replace(tzinfo=tz)
+    return dt
+
+
+# TODO: migrate to using datetime, where user can optionall specify
+# a time as well. if only date is given, default to time.min
+def parse_date(
+    raw_date: str | datetime | date | object, tz: tzinfo
+) -> datetime:
+    if isinstance(raw_date, datetime):
+        return ensure_timezone(raw_date, tz)
+    elif isinstance(raw_date, date):
+        return datetime.combine(raw_date, time.min, tzinfo=tz)
     assert isinstance(raw_date, str)
-    return date_parser.parse(raw_date).date()
+    dt = date_parser.parse(raw_date)
+    return ensure_timezone(dt, tz)
 
 
-def parse_metadata(path: Path) -> tuple[Metadata, str]:
+def parse_metadata(
+    path: Path, config: ZonaConfig
+) -> tuple[Metadata, str]:
     """
     Parses a file and returns parsed Metadata and its content. Defaults
     are applied for missing fields. If there is no metadata, a Metadata
@@ -53,10 +69,11 @@ def parse_metadata(path: Path) -> tuple[Metadata, str]:
     raw_meta = post.metadata or {}
     defaults = {
         "title": zona.util.filename_to_title(path),
-        "date": date.fromtimestamp(path.stat().st_ctime),
+        "date": datetime.fromtimestamp(path.stat().st_ctime),
+        "description": config.blog.defaults.description,
     }
     meta = {**defaults, **raw_meta}
-    meta["date"] = parse_date(meta.get("date"))
+    meta["date"] = parse_date(meta.get("date"), config.feed.timezone)
     try:
         metadata = from_dict(
             data_class=Metadata,

uv.lock

@@ -44,6 +44,16 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/94/35/386550fd60316d1e37eccdda609b074113298f23cef5bddb2049823fe666/dacite-1.9.2-py3-none-any.whl", hash = "sha256:053f7c3f5128ca2e9aceb66892b1a3c8936d02c686e707bee96e19deef4bc4a0", size = 16600, upload-time = "2025-02-05T09:27:24.345Z" },
 ]
 
+[[package]]
+name = "feedgen"
+version = "1.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "lxml" },
+    { name = "python-dateutil" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/6b/59/be0a6f852b5dfbf19e6c8e962c8f41407697f9f52a7902250ed98683ae89/feedgen-1.0.0.tar.gz", hash = "sha256:d9bd51c3b5e956a2a52998c3708c4d2c729f2fcc311188e1e5d3b9726393546a", size = 258496, upload-time = "2023-12-25T18:04:08.421Z" }
+
 [[package]]
 name = "iniconfig"
 version = "2.1.0"
@@ -87,6 +97,46 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/1e/fd/aba08bb9e527168efad57985d7db9a853eb2384b1efa5ca5f3a3794c9cef/latex2mathml-3.78.0-py3-none-any.whl", hash = "sha256:1aeca3dc027b3006ad7b301b7f4a15ffbb4c1451e3dc8c3389e97b37b497e1d6", size = 73673, upload-time = "2025-05-03T16:51:51.991Z" },
 ]
 
+[[package]]
+name = "lxml"
+version = "6.0.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/c5/ed/60eb6fa2923602fba988d9ca7c5cdbd7cf25faa795162ed538b527a35411/lxml-6.0.0.tar.gz", hash = "sha256:032e65120339d44cdc3efc326c9f660f5f7205f3a535c1fdbf898b29ea01fb72", size = 4096938, upload-time = "2025-06-26T16:28:19.373Z" }
+wheels = [
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+
 [[package]]
 name = "markdown"
 version = "3.8.2"
@@ -463,6 +513,7 @@ version = "1.2.1"
 source = { editable = "." }
 dependencies = [
     { name = "dacite" },
+    { name = "feedgen" },
     { name = "jinja2" },
     { name = "l2m4m" },
     { name = "markdown" },
@@ -489,6 +540,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "dacite", specifier = ">=1.9.2" },
+    { name = "feedgen", specifier = ">=1.0.0" },
     { name = "jinja2", specifier = ">=3.1.6" },
     { name = "l2m4m", specifier = ">=1.0.4" },
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