From 3cb303fc1ba13a65f0af1a29209ae3e85e494d87 Mon Sep 17 00:00:00 2001
From: Patrick Spek <p.spek@tyil.nl>
Date: Fri, 5 Mar 2021 10:22:51 +0100
Subject: Create a news feed per tag

---
 bin/make-feeds | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100755 bin/make-feeds

(limited to 'bin/make-feeds')

diff --git a/bin/make-feeds b/bin/make-feeds
new file mode 100755
index 0000000..d8df2c9
--- /dev/null
+++ b/bin/make-feeds
@@ -0,0 +1,71 @@
+#!/bin/sh
+
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+
+readonly ROOTDIR="$(CDPATH="" cd -- "$(dirname -- "$0")/.." && pwd -P)"
+
+main()
+{
+	# Handle opts
+	while getopts ":h" opt
+	do
+		case "$opt" in
+			h) usage && exit 0 ;;
+			*)
+				printf "Invalid option passed: %s\n" "$OPTARG" >&2
+				;;
+		esac
+	done
+
+	shift $(( OPTIND - 1 ))
+
+	# Make a list of all unique tags
+	tags="$(mktemp)"
+	awk '/^tags:/ { for (i=2; i<=NF; i++) print $i }' "$ROOTDIR/src/_posts/"* \
+		| sort \
+		| uniq \
+		> "$tags"
+
+	# Create a feed for each tag
+	mkdir -p -- "$ROOTDIR/src/feed"
+	mkdir -p -- "$ROOTDIR/src/atom"
+
+	while read -r tag
+	do
+		lc_tag="$(printf "%s" "$tag" | tr "[:upper:]" "[:lower:]")"
+
+		echo "Creating RSS 2.0 feed for $lc_tag"
+		TAG="$tag" envsubst < "$ROOTDIR/share/feed-rss2.xml" > "$ROOTDIR/src/feed/$lc_tag.xml"
+
+		echo "Creating Atom feed for $lc_tag"
+		TAG="$tag" envsubst < "$ROOTDIR/share/feed-atom.xml" > "$ROOTDIR/src/atom/$lc_tag.xml"
+
+		unset lc_tag
+	done < "$tags"
+
+	# Clean up
+	rm -f -- "$tags"
+}
+
+usage()
+{
+	cat <<EOF
+Usage:
+	${0##*/} -h
+
+Generate all the seperate feeds for each tag used in posts.
+
+Options:
+	-h  Show this help text and exit.
+EOF
+}
+
+main "$@"
-- 
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