From 54ac714da7175a8a08239e500a4e75a48b97d97e Mon Sep 17 00:00:00 2001
From: Dmitry Ilvokhin <d@ilvokhin.com>
Date: Sat, 24 Dec 2022 18:10:17 +0000
Subject: Initial version of generator

Generation of feed page and post pages are supported.

Markdown to html conversion seems working. At least there is
nothing strange with hello-world example.
---
 .gitignore                              |  4 ++
 blog/__init__.py                        |  0
 blog/blog.py                            | 53 ++++++++++++++++++++++++
 blog/feed.py                            | 14 +++++++
 blog/post.py                            | 71 +++++++++++++++++++++++++++++++++
 blog/render.py                          | 16 ++++++++
 posts/drafts/hello-world/hello-world.md | 59 +++++++++++++++++++++++++++
 posts/drafts/hello-world/metadata.txt   |  3 ++
 templates/feed.html                     | 23 +++++++++++
 templates/post.html                     | 17 ++++++++
 10 files changed, 260 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 blog/__init__.py
 create mode 100644 blog/blog.py
 create mode 100644 blog/feed.py
 create mode 100644 blog/post.py
 create mode 100644 blog/render.py
 create mode 100644 posts/drafts/hello-world/hello-world.md
 create mode 100644 posts/drafts/hello-world/metadata.txt
 create mode 100644 templates/feed.html
 create mode 100644 templates/post.html

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0dd11be
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.env
+*.swp
+.DS_Store
+remote
diff --git a/blog/__init__.py b/blog/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/blog/blog.py b/blog/blog.py
new file mode 100644
index 0000000..cb6ab1e
--- /dev/null
+++ b/blog/blog.py
@@ -0,0 +1,53 @@
+#! /usr/bin/env python3
+# -*- coding: utf-8 -*
+
+import os
+import shutil
+
+from jinja2 import Environment, FileSystemLoader, select_autoescape
+
+from post import Post
+from feed import Feed
+
+
+def recreate_workdir(basedir):
+    if os.path.exists(basedir):
+        shutil.rmtree(basedir)
+    os.makedirs(basedir)
+
+
+def find_posts(template, basedir):
+    posts = []
+    for subdir in os.listdir(basedir):
+        posts.append(Post(template, os.path.join(basedir, subdir)))
+    return posts
+
+
+def generate_blog(include_drafts=False):
+    env = Environment(loader=FileSystemLoader(searchpath="templates"),
+                      autoescape=select_autoescape())
+
+    posts = find_posts(env.get_template("post.html"),
+                       os.path.join("posts", "public"))
+
+    if include_drafts:
+        drafts = find_posts(env.get_template("post.html"),
+                            os.path.join("posts", "drafts"))
+        posts.extend(drafts)
+
+    workdir = "remote"
+    recreate_workdir(workdir)
+
+    for post in posts:
+        post.generate(workdir)
+
+    feed = Feed(env.get_template("feed.html"), posts)
+    feed.generate(workdir)
+
+
+def main():
+    generate_blog(include_drafts=True)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/blog/feed.py b/blog/feed.py
new file mode 100644
index 0000000..d8ffc8c
--- /dev/null
+++ b/blog/feed.py
@@ -0,0 +1,14 @@
+import os
+
+import render
+
+
+class Feed(object):
+    def __init__(self, template, posts):
+        self.template = template
+        self.posts = posts
+
+    def generate(self, basedir):
+        index = os.path.join(basedir, "index.html")
+        rendered = self.template.render(posts=self.posts)
+        render.write_file_content(index, rendered)
diff --git a/blog/post.py b/blog/post.py
new file mode 100644
index 0000000..1d35b6c
--- /dev/null
+++ b/blog/post.py
@@ -0,0 +1,71 @@
+import os
+import shutil
+import datetime
+import functools
+
+import render
+
+
+class Metadata(object):
+    __slots__ = ("title", "date", "status")
+
+    def __init__(self, title, date, status):
+        self.title = title
+        self.date = date
+        self.status = status
+
+
+class Post(object):
+    def __init__(self, template, directory):
+        self.template = template
+        self.directory = directory
+        self.name = os.path.basename(directory)
+
+    @staticmethod
+    def _load_raw_metadata(filename):
+        data = {}
+
+        with open(filename) as f:
+            for line in f:
+                k, v = line.strip().split(": ")
+                data[k] = v
+
+        return data
+
+    @functools.cached_property
+    def metadata(self):
+        raw = Post._load_raw_metadata(os.path.join(self.directory,
+                                                   "metadata.txt"))
+
+        title = raw["Title"]
+        date = raw.get("Date", datetime.date.today().strftime("%Y-%m-%d"))
+        status = raw.get("Status", "draft")
+
+        return Metadata(title, date, status)
+
+    def is_draft(self):
+        return self.metadata.status == "draft"
+
+    def generate(self, basedir):
+        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}`"
+
+        body = render.to_html(md)
+        rendered = self.template.render(title=self.metadata.title,
+                                        date=self.metadata.date,
+                                        body=body)
+        render.write_file_content(os.path.join(workdir, "index.html"),
+                                  rendered)
diff --git a/blog/render.py b/blog/render.py
new file mode 100644
index 0000000..4e26318
--- /dev/null
+++ b/blog/render.py
@@ -0,0 +1,16 @@
+import markdown
+
+
+def read_file_content(filename):
+    with open(filename) as f:
+        return f.read()
+
+
+def write_file_content(filename, data):
+    with open(filename, mode='w') as f:
+        f.write(data)
+
+
+def to_html(filename):
+    text = read_file_content(filename)
+    return markdown.markdown(text, extensions=["fenced_code", "footnotes"])
diff --git a/posts/drafts/hello-world/hello-world.md b/posts/drafts/hello-world/hello-world.md
new file mode 100644
index 0000000..cecfa2d
--- /dev/null
+++ b/posts/drafts/hello-world/hello-world.md
@@ -0,0 +1,59 @@
+This is a post to demonstrate and test content generation code. I am not a
+writing master, so I am going just enumerate features I am going to use to see
+how they are rendered.
+
+And I want to know how multiple paragraphs are rendered.
+
+
+## Code
+
+Standalone code block like this one.
+
+```
+#include <iostream>
+
+int main() {
+    std::cout << "Hello, World" << std::endl;
+    return 0;
+}
+```
+
+And embedded code like `this` and `this`.
+
+
+## Lists
+* I
+* like
+* itemized
+* lists
+
+Also, sometimes I use enumerated lists like this one.
+1. One.
+2. Two.
+3. Three.
+
+
+## Formatting
+
+This is a **bold** text. And this is _italic_.
+
+
+## Quotes
+> I don't know what's the matter with people: they don't learn by
+> understanding; they learn by some other way — by rote or something.
+> Their knowledge is so fragile!
+
+
+## Footnotes
+
+Oh, some it would nice to have footnotes like this one[^1].
+
+[^1]: This should work.
+
+
+## URLs
+
+Here is the url to [website][1]. And the same [url](https://ilvokhin.com), but
+embedded into the text.
+
+[1]: https://ilvokhin.com
diff --git a/posts/drafts/hello-world/metadata.txt b/posts/drafts/hello-world/metadata.txt
new file mode 100644
index 0000000..800612c
--- /dev/null
+++ b/posts/drafts/hello-world/metadata.txt
@@ -0,0 +1,3 @@
+Title: Hello, World!
+Date: 2022-12-23
+Status: draft
diff --git a/templates/feed.html b/templates/feed.html
new file mode 100644
index 0000000..ee1411e
--- /dev/null
+++ b/templates/feed.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+
+<html>
+
+<head>
+    <meta charset="UTF-8">
+    <title>Blog</title>
+</head>
+
+<body>
+    {% if posts %}
+        <ul>
+        {% for post in posts %}
+            <li>
+                <a href="{{ post.name }}">{{ post.metadata.title }}</a>
+                ({{ post.metadata.date }})
+            </li>
+        {% endfor %}
+        </ul>
+    {% endif %}
+</body>
+
+</html>
diff --git a/templates/post.html b/templates/post.html
new file mode 100644
index 0000000..088b2f6
--- /dev/null
+++ b/templates/post.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+
+<html>
+
+<head>
+    <meta charset="UTF-8">
+    <title>{{ title }}</title>
+</head>
+
+<body>
+    <h1>{{ title }}</h1>
+    <h3>{{ date }}</h3>
+
+    {{ body|safe }}
+</body>
+
+</html>
-- 
cgit v1.2.3-70-g09d2