From 24a41ca958e02aa381c622298bbebb0bcaf87157 Mon Sep 17 00:00:00 2001
From: Midgard <2885-Midgard@users.noreply.framagit.org>
Date: Tue, 16 Jun 2020 02:10:26 +0200
Subject: [PATCH] Add RSS

---
 makefile |  6 +++++-
 rss.py   | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 1 deletion(-)
 create mode 100755 rss.py

diff --git a/makefile b/makefile
index d41e247..32f7f82 100644
--- a/makefile
+++ b/makefile
@@ -7,12 +7,16 @@ PYTHON ::= venv/bin/python
 
 .PHONY: all clean public
 
-all: $(BUILD_DIR)/index.html $(BUILD_DIR)/syntax.css public $(BLOG_HTML)
+all: $(BUILD_DIR)/index.html $(BUILD_DIR)/feed.xml $(BUILD_DIR)/syntax.css public $(BLOG_HTML)
 
 $(BUILD_DIR)/index.html: templates/index.html $(BLOG) page.py
 	@mkdir -p "$(@D)"
 	$(PYTHON) page.py --index "$<" "$@" $(BLOG)
 
+$(BUILD_DIR)/rss.xml: $(BLOG) rss.py page.py
+	@mkdir -p "$(@D)"
+	$(PYTHON) rss.py $(BLOG) > "$@"
+
 $(BUILD_DIR)/blog/%.html: blog/%.md templates/blog.html page.py
 	@mkdir -p "$(@D)"
 	$(PYTHON) page.py "$<" "$@"
diff --git a/rss.py b/rss.py
new file mode 100755
index 0000000..05f4115
--- /dev/null
+++ b/rss.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+import sys
+from functools import partial as p
+from ipo import ipo, write, starstarmap
+
+from page import blog_page_metadata
+
+
+BASE_URL = "https://www.braindeaddev.com/P5t7oFqPF7oEX"
+
+DOC_TEMPLATE = """<?xml version="1.0"?>
+<rss version="2.0">
+	<channel>
+		<title>Midgard's blog</title>
+		<description></description>
+		<lastBuildDate>{last_updated}</lastBuildDate>
+		<author>Midgard</author>
+		<link>{url}</link>{0}
+	</channel>
+</rss>"""
+
+ITEM_TEMPLATE = """
+		<item>
+			<title>{title}</title>
+			<guid>{path}</guid>
+			<pubDate>{published_rfc822}</pubDate>
+			<link>{url}</link>
+			<description>{summary}</description>
+		</item>"""
+			# <category>{category}</category>
+
+
+def iso8601torfc822(iso8601):
+	# pylint: disable=invalid-name
+	y, m, d = map(int, iso8601.split("-"))
+	month = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"][m]
+	return f"{d} {month} {y} 00:00:00 UTC"
+
+
+def main():
+	items = (
+		ipo(sys.argv[1:]) |
+		p(map, blog_page_metadata) |
+		p(sorted, key=lambda x: x["published"]) |
+		p(map, lambda x: {
+			**x,
+			"published_rfc822": iso8601torfc822(x["published"]),
+			"url": BASE_URL + x["path"]
+		}) | list
+	)
+
+	last_date = items.data[-1]["published_rfc822"]
+
+	(
+		items |
+		p(starstarmap, ITEM_TEMPLATE.format) |
+		"".join |
+		p(DOC_TEMPLATE.format, url=BASE_URL, last_updated=last_date) |
+		write
+	)
+
+if __name__ == '__main__':
+	main()