feat: rss feed generation

CHANGELOG.md

@@ -1,3 +1,9 @@
+# 1.3.0
+
+- Added RSS feed generation.
+- Added default post description to configuration.
+- Added time-of-day support to post `date` frontmatter parsing.
+
 # 1.2.1
 
 - Added `--version` flag to CLI.

README.md

@@ -28,6 +28,7 @@ For an example of a website built with zona, please see
   - [Site Layout](#site-layout)
   - [Templates](#templates)
     - [Markdown Footer](#markdown-footer)
+  - [RSS Feed Generation](#rss-feed-generation)
   - [Internal Link Resolution](#internal-link-resolution)
   - [Syntax Highlighting](#syntax-highlighting)
   - [Markdown Extensions](#markdown-extensions)
@@ -49,6 +50,7 @@ For an example of a website built with zona, please see
   - Live refresh in browser preview.
 - `jinja2` template support with sensible defaults included.
   - Basic page, blog post, post list.
+- RSS feed generation.
 - Glob ignore.
 - YAML frontmatter.
 - Easily configurable sitemap header.
@@ -212,6 +214,17 @@ it's parsed and rendered into HTML, then made available to other templates as
 the `footer` variable. If `footer.md` is missing but `footer.html` exists, then
 it's used instead. **Note: links are _not_ resolved in the footer.**
 
+### RSS Feed Generation
+
+Zona can also generates an RSS feed containing your blog posts. This feature is
+disabled by default, and you can enable it in the
+[configuration](#configuration).
+
+The default location is a file called `rss.xml` in the content root. All RSS
+related configuration is specified in `config.yml`. If you plan to use the feed,
+make sure to replace the placeholder `link`, `title`, `description`, and
+`author` configuration values before you set `enabled: true`.
+
 ### Internal Link Resolution
 
 When zona encounters links in Markdown documents, it attempts to resolve them as
@@ -309,18 +322,19 @@ YAML frontmatter can be used to configure the metadata of documents. All of them
 are optional. `none` is used when the option is unset. The following options are
 available:
 
-| Key          | Type & Default                    | Description                                                                                            |
+| Key           | Type & Default                    | Description                                                                                            |
-| ------------ | --------------------------------- | ------------------------------------------------------------------------------------------------------ |
+| ------------- | --------------------------------- | ------------------------------------------------------------------------------------------------------ |
-| `title`      | `str` = title-cased filename.     | Title of the page.                                                                                     |
+| `title`       | `str` = title-cased filename.     | Title of the page.                                                                                     |
-| `date`       | Date string = file modified time. | Displayed on blog posts and used for post_list sorting.                                                |
+| `description` | `str \| none` = `none`            | Description. If omitted, default from [config](#configuration) will be used.                           |
-| `show_title` | `bool` = `true`                   | Whether `metadata.title` should be included in the template.                                           |
+| `date`        | Date string = file modified time. | Displayed on blog posts and used for post_list sorting.                                                |
-| `header`     | `bool` = `true`                   | Whether the header sitemap should be rendered.                                                         |
+| `show_title`  | `bool` = `true`                   | Whether `metadata.title` should be included in the template.                                           |
-| `footer`     | `bool` = `true`                   | Whether the footer should be rendered.                                                                 |
+| `header`      | `bool` = `true`                   | Whether the header sitemap should be rendered.                                                         |
-| `template`   | `str \| none` = `none`            | Template to use for this page. Relative to `templates/`, `.html` extension optional.                   |
+| `footer`      | `bool` = `true`                   | Whether the footer should be rendered.                                                                 |
-| `post`       | `bool \| none` = `none`           | Whether this page is a **post**. `true`/`false` is _absolute_. Leave it unset for automatic detection. |
+| `template`    | `str \| none` = `none`            | Template to use for this page. Relative to `templates/`, `.html` extension optional.                   |
-| `draft`      | `bool` = `false`                  | Whether this page is a draft. See [drafts](#drafts) for more.                                          |
+| `post`        | `bool \| none` = `none`           | Whether this page is a **post**. `true`/`false` is _absolute_. Leave it unset for automatic detection. |
-| `ignore`     | `bool` = `false`                  | Whether this page should be ignored in _both_ `final` and `draft` contexts.                            |
+| `draft`       | `bool` = `false`                  | Whether this page is a draft. See [drafts](#drafts) for more.                                          |
-| `math`       | `bool` = `true`                   | Whether the LaTeX extension should be enabled for this page.                                           |
+| `ignore`      | `bool` = `false`                  | Whether this page should be ignored in _both_ `final` and `draft` contexts.                            |
+| `math`        | `bool` = `true`                   | Whether the LaTeX extension should be enabled for this page.                                           |
 
 **Note**: you can specify the date in any format that can be parsed by
 [`python-dateutil`](https://pypi.org/project/python-dateutil/).
@@ -374,12 +388,23 @@ useful settings are listed here.
 Please see the default configuration:
 
 ```yaml
-base_url: /
+feed:
+  enabled: true
+  timezone: UTC
+  path: rss.xml
+  link: https://example.com
+  title: Zona Website
+  description: My zona website.
+  language: en
+  author:
+    name: John Doe
+    email: john@doe.net
 sitemap:
   Home: /
 ignore:
   - .marksman.toml
 markdown:
+  image_labels: true
   tab_length: 2
   syntax_highlighting:
     enabled: true
@@ -392,6 +417,8 @@ build:
   include_drafts: false
 blog:
   dir: blog
+  defaults:
+    description: A blog post
 server:
   reload:
     enabled: true
@@ -400,6 +427,15 @@ server:
 
 | Name                                   | Description                                                                                     |
 | -------------------------------------- | ----------------------------------------------------------------------------------------------- |
+| `feed.enabled`                         | Whether RSS feed should be generated. **Off by default**.                                       |
+| `feed.timezime`                        | Timezone to use for post `pubDate` values. Must be an IANA compliant string.                    |
+| `feed.path`                            | Location of the feed, relative to content root.                                                 |
+| `feed.link`                            | The base URL of the website.                                                                    |
+| `feed.title`                           | Website title.                                                                                  |
+| `feed.description`                     | Website description.                                                                            |
+| `feed.language`                        | String specifying website's language code.                                                      |
+| `author.name`                          | Your full name.                                                                                 |
+| `author.email`                         | Your email address.                                                                             |
 | `sitemap`                              | Sitemap dictionary. See [Sitemap](#sitemap).                                                    |
 | `ignore`                               | List of paths to ignore. See [Ignore List](#ignore-list).                                       |
 | `markdown.tab_length`                  | How many spaces should be considered an indentation level.                                      |
@@ -410,6 +446,7 @@ server:
 | `build.clean_output_dir`               | Whether previous build artifacts should be cleared when building. Recommended to leave this on. |
 | `build.include_drafts`                 | Whether drafts should be included by default.                                                   |
 | `blog.dir`                             | Name of a directory relative to `content/` whose children are automatically considered posts.   |
+| `blog.defaults.description`            | Default description for blog posts with no `description` in their frontmatter.                  |
 | `server.reload.enabled`                | Whether the preview server should use [live reload](#live-preview).                             |
 | `server.reload.scroll_tolerance`       | The distance, in pixels, from the bottom to still count as "scrolled to bottom".                |
 

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 }}"
+  <time class="post-date" datetime="{{ metadata.date.date() | safe }}"
-  >{{ metadata.date | safe}}</time>
+  >{{ 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 }}"
+      <time class="post-list-date" datetime="{{ item.metadata.date.date() | safe }}"
-      >{{ item.metadata.date | safe}}</time>: <a href="/{{ item.url }}"
+      >{{ item.metadata.date.date() | safe}}</time>: <a href="/{{ item.url }}"
       >{{ item.metadata.title }}</a>
     </li>
     {% endfor %}

src/zona/layout.py

@@ -1,5 +1,6 @@
 from dataclasses import asdict, dataclass
 from pathlib import Path
+from zoneinfo import ZoneInfo
 
 import typer
 import yaml
@@ -145,9 +146,13 @@ def initialize_site(root: Path | None = None):
     logger.debug("Loading default configuation.")
     config = ZonaConfig()
     logger.debug(f"Writing default configuration to {config_path}.")
+    config_dict = asdict(config)
+    if "feed" in config_dict and "timezone" in config_dict["feed"]:
+        tz: ZoneInfo = config_dict["feed"]["timezone"]
+        config_dict["feed"]["timezone"] = tz.key
     with open(config_path, "w") as f:
         yaml.dump(
-            asdict(config),
+            config_dict,
             f,
             sort_keys=False,
             default_flow_style=False,

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
+    date: datetime
-    description: str | None
+    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:
+def ensure_timezone(dt: datetime, tz: tzinfo) -> datetime:
-    if isinstance(raw_date, date):
+    if dt.tzinfo is None or dt.utcoffset() is None:
-        return raw_date
+        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 = [
+    { url = "https://files.pythonhosted.org/packages/89/c3/d01d735c298d7e0ddcedf6f028bf556577e5ab4f4da45175ecd909c79378/lxml-6.0.0-cp312-cp312-macosx_10_13_universal2.whl", hash = "sha256:78718d8454a6e928470d511bf8ac93f469283a45c354995f7d19e77292f26108", size = 8429515, upload-time = "2025-06-26T16:26:06.776Z" },
+    { url = "https://files.pythonhosted.org/packages/06/37/0e3eae3043d366b73da55a86274a590bae76dc45aa004b7042e6f97803b1/lxml-6.0.0-cp312-cp312-macosx_10_13_x86_64.whl", hash = "sha256:84ef591495ffd3f9dcabffd6391db7bb70d7230b5c35ef5148354a134f56f2be", size = 4601387, upload-time = "2025-06-26T16:26:09.511Z" },
+    { url = "https://files.pythonhosted.org/packages/a3/28/e1a9a881e6d6e29dda13d633885d13acb0058f65e95da67841c8dd02b4a8/lxml-6.0.0-cp312-cp312-manylinux2010_i686.manylinux2014_i686.manylinux_2_12_i686.manylinux_2_17_i686.whl", hash = "sha256:2930aa001a3776c3e2601cb8e0a15d21b8270528d89cc308be4843ade546b9ab", size = 5228928, upload-time = "2025-06-26T16:26:12.337Z" },
+    { url = "https://files.pythonhosted.org/packages/9a/55/2cb24ea48aa30c99f805921c1c7860c1f45c0e811e44ee4e6a155668de06/lxml-6.0.0-cp312-cp312-manylinux2014_aarch64.manylinux_2_17_aarch64.whl", hash = "sha256:219e0431ea8006e15005767f0351e3f7f9143e793e58519dc97fe9e07fae5563", size = 4952289, upload-time = "2025-06-28T18:47:25.602Z" },
+    { url = "https://files.pythonhosted.org/packages/31/c0/b25d9528df296b9a3306ba21ff982fc5b698c45ab78b94d18c2d6ae71fd9/lxml-6.0.0-cp312-cp312-manylinux2014_x86_64.manylinux_2_17_x86_64.whl", hash = "sha256:bd5913b4972681ffc9718bc2d4c53cde39ef81415e1671ff93e9aa30b46595e7", size = 5111310, upload-time = "2025-06-28T18:47:28.136Z" },
+    { url = "https://files.pythonhosted.org/packages/e9/af/681a8b3e4f668bea6e6514cbcb297beb6de2b641e70f09d3d78655f4f44c/lxml-6.0.0-cp312-cp312-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:390240baeb9f415a82eefc2e13285016f9c8b5ad71ec80574ae8fa9605093cd7", size = 5025457, upload-time = "2025-06-26T16:26:15.068Z" },
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 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" },
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