From 2970a04be8d3611c855d22edc7bee3bcfa6eb823 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois-Xavier=20Carton?= <fx.carton91@gmail.com>
Date: Mon, 9 Nov 2020 02:10:30 +0100
Subject: add feeds support (rss, atom)

---
 blogit | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/blogit b/blogit
index f5362c5..24e79d4 100755
--- a/blogit
+++ b/blogit
@@ -8,6 +8,11 @@ endif
 # The following can be configured in config
 BLOG_DATE_FORMAT_INDEX ?= %x
 BLOG_DATE_FORMAT ?= %x %X
+BLOG_TITLE ?= blog
+BLOG_DESCRIPTION ?= blog
+BLOG_URL_ROOT ?= http://localhost/blog
+BLOG_FEED_MAX ?= 20
+BLOG_FEEDS ?= rss atom
 
 
 .PHONY: help init build deploy clean
@@ -38,7 +43,7 @@ init:
 	printf '' > templates/article_footer.html
 	printf 'blog\n' > .git/info/exclude
 
-build: blog/index.html tagpages $(patsubst articles/%,blog/%.html,$(ARTICLES))
+build: blog/index.html tagpages $(patsubst articles/%,blog/%.html,$(ARTICLES)) $(patsubst %,blog/%.xml,$(BLOG_FEEDS))
 
 deploy: build
 	rsync -rLtvz $(BLOG_RSYNC_OPTS) blog/ data/ $(BLOG_REMOTE)
@@ -57,7 +62,7 @@ tags/%: articles/%
 
 blog/index.html: $(ARTICLES) $(TAGFILES) $(addprefix templates/,$(addsuffix .html,header index_header tag_list_header tag_entry tag_separator tag_list_footer article_list_header article_entry article_separator article_list_footer index_footer footer))
 	mkdir -p blog
-	TITLE="index"; \
+	TITLE="$(BLOG_TITLE)"; \
 	export TITLE; \
 	envsubst < templates/header.html > $@; \
 	envsubst < templates/index_header.html >> $@; \
@@ -158,3 +163,36 @@ blog/%.html: articles/% $(addprefix templates/,$(addsuffix .html,header article_
 	envsubst < templates/article_footer.html >> $@; \
 	envsubst < templates/footer.html >> $@; \
 
+blog/rss.xml: $(ARTICLES)
+	printf '<?xml version="1.0" encoding="UTF-8"?>\n<rss version="2.0">\n<channel>\n<title>%s</title>\n<link>%s</link>\n<description>%s</description>\n' \
+		"$(BLOG_TITLE)" "$(BLOG_URL_ROOT)" "$(BLOG_DESCRIPTION)" > $@
+	for f in $(ARTICLES); do \
+		printf '%s ' "$$f"; \
+		git log --diff-filter=A --date="format:%s %a, %d %b %Y %H:%M:%S %z" --pretty=format:'%ad%n' -- "$$f"; \
+	done | sort -k2nr | head -n $(BLOG_FEED_MAX) | cut -d" " -f1,3- | while IFS=" " read -r FILE DATE; do \
+		printf '<item>\n<title>%s</title>\n<link>%s</link>\n<guid>%s</guid>\n<pubDate>%s</pubDate>\n<description>%s</description>\n</item>\n' \
+			"`head -n 1 $$FILE`" \
+			"$(BLOG_URL_ROOT)/`basename $$FILE`.html" \
+			"$(BLOG_URL_ROOT)/`basename $$FILE`.html" \
+			"$$DATE" \
+			"`sed -n '1d;/^$$/{2{d;b};q};p' < $$FILE`"; \
+	done >> $@
+	printf '</channel>\n</rss>\n' >> $@
+
+blog/atom.xml: $(ARTICLES)
+	printf '<?xml version="1.0" encoding="UTF-8"?>\n<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">\n<title type="text">%s</title>\n<subtitle type="text">%s</subtitle>\n<updated>%s</updated>\n<link rel="alternate" type="text/html" href="%s"/>\n<id>%s</id>\n<link rel="self" type="application/atom+xml" href="%s"/>\n' \
+		"$(BLOG_TITLE)" "$(BLOG_DESCRIPTION)" "$(shell date +%Y-%m-%dT%H:%M:%SZ)" "$(BLOG_URL_ROOT)" "$(BLOG_URL_ROOT)/atom.xml" "$(BLOG_URL_ROOT)/atom.xml" > $@
+	for f in $(ARTICLES); do \
+		printf '%s ' "$$f"; \
+		git log --diff-filter=A --date="format:%s %Y-%m-%dT%H:%M:%SZ" --pretty=format:'%ad %aN%n' -- "$$f"; \
+	done | sort -k2nr | head -n $(BLOG_FEED_MAX) | cut -d" " -f1,3- | while IFS=" " read -r FILE DATE AUTHOR; do \
+		printf '<entry>\n<title type="text">%s</title>\n<link rel="alternate" type="text/html" href="%s"/>\n<id>%s</id>\n<published>%s</published>\n<updated>%s</updated>\n<author><name>%s</name></author>\n<summary type="text">%s</summary>\n</entry>\n' \
+			"`head -n 1 $$FILE`" \
+			"$(BLOG_URL_ROOT)/`basename $$FILE`.html" \
+			"$(BLOG_URL_ROOT)/`basename $$FILE`.html" \
+			"$$DATE" \
+			"`git log -n 1 --date="format:%Y-%m-%dT%H:%M:%SZ" --pretty=format:'%ad' -- "$$FILE"`" \
+			"$$AUTHOR" \
+			"`sed -n '1d;/^$$/{2{d;b};q};p' < $$FILE`"; \
+	done >> $@
+	printf '</feed>\n' >> $@
-- 
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