reimplement website using shell scripts

major change, i know. now i'm using ssg and rssg by roman zolotarev.
okay, well, not exactly. ssg is modified to generate pages for gemini
too. it's hard to maintain two different things simultaneously.

bye-bye jekyll!

1 files changed, 190 insertions, 0 deletions

diff --git a/bin/rssg b/bin/rssg
new file mode 100755
index 0000000..099fe67
--- /dev/null
+++ b/bin/rssg
@@ -0,0 +1,190 @@
+#!/bin/sh
+#
+# https://www.romanzolotarev.com/bin/rssg
+# Copyright 2018 Roman Zolotarev <hi@romanzolotarev.com>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+set -e
+set -x
+
+
+main () {
+	test -n "$1" || usage
+	test -n "$2" || usage
+	test -f "$1" || no_file "$1"
+
+
+	index_file=$(readlink -f "$1")
+	test -z "${index_file##*html}" && html=$(cat "$index_file")
+	test -z "${index_file##*md}" && html=$(md_to_html "$index_file")
+	test -n "$html" || usage
+
+	base="${index_file%/*}"
+	base_url="$(echo "$html" | get_url | sed 's#\(.*\)/[^/]*#\1#')"
+
+	url=$(		echo "$html" | get_url)
+
+	title="$2"
+
+	description=$(	echo "$html" | get_description |
+			remove_tags |
+			remove_nbsp )
+
+	items=$(	echo "$html" | get_items)
+
+	rss=$(		echo "$items" |
+			render_items "$base" "$base_url" |
+			render_feed "$url" "$title" "$description")
+
+	>&2 echo "[rssg] ${index_file##$(pwd)/} $(echo "$rss" | grep -c '<item>') items"
+	echo "$rss"
+}
+
+
+usage() {
+	echo "usage: ${0##*/} index.{html,md} title > rss.xml" >&2
+	exit 1
+}
+
+
+no_file() {
+	echo "${0##*/}: $1: No such file" >&2
+	exit 2
+}
+
+
+md_to_html() {
+	test -x "$(which lowdown)" || exit 3
+	lowdown \
+    --html-no-escapehtml \
+    --html-no-skiphtml \
+    --parse-no-metadata \
+    --parse-no-autolink "$1"
+}
+
+
+get_title() {
+	awk 'tolower($0)~/^<h1/{gsub(/<[^>]*>/,"",$0);print;exit}'
+}
+
+
+get_url() {
+	grep -i '<a .*rss.xml"' | head -1 |
+	sed 's#.*href="\(.*\)".*#\1#'
+}
+
+
+get_items() {
+	grep -i 'href=".*" title="' |
+	sed 's#.*href="\(.*\)" title="\(.*\)">\(.*\)</a>.*#\1 \2 \3#'
+}
+
+
+get_description() {
+	start='sub("^.*<"s"*"t"("s"[^>]*)?>","")'
+	stop='sub("</"s"*"t""s"*>.*","")&&x=1'
+	awk -v 's=[[:space:]]' -v 't=[Pp]' "$start,$stop;x{exit}"
+}
+
+remove_tags() {
+	sed 's#<[^>]*>##g;s#</[^>]*>##g'
+}
+
+
+remove_nbsp() {
+	sed 's#\&nbsp;# #g'
+}
+
+
+rel_to_abs_urls() {
+	site_url="$1"
+	base_url="$2"
+
+	abs='s#(src|href)="/([^"]*)"#\1="'"$site_url"/'\2"#g'
+	rel='s#(src|href)="([^:/"]*)"#\1="'"$base_url"/'\2"#g'
+	sed -E "$abs;$rel"
+}
+
+
+date_rfc_822() {
+	date '+%a, %d %b %Y %H:%M:%S %z' \
+	"$(echo "$1"| tr -cd '[:digit:]')0000"
+}
+
+
+render_items() {
+	while read -r i
+	do render_item "$1" "$2" "$i"
+	done
+}
+
+
+render_item() {
+	base="$1"
+	base_url="$2"
+	item="$3"
+
+	site_url="$(echo "$base_url"| sed 's#\(.*//.*\)/.*#\1#')"
+
+	date=$(echo "$item"|awk '{print$2}')
+	url=$(echo "$item"|awk '{print$1}')
+
+	f="$base/$url"
+	test -f "$f" && html=$(cat "$f")
+	test -f "${f%\.html}.md" && html=$(md_to_html "${f%\.html}.md")
+
+	description=$(
+		echo "$html" |
+		rel_to_abs_urls "$site_url" "$base_url" |
+		remove_nbsp
+	)
+	title=$(echo "$description" | get_title)
+	guid="$base_url/$(echo "$url" | sed 's#^/##')"
+
+	echo '
+<item>
+<guid>'"$guid"'</guid>
+<link>'"$guid"'</link>
+<pubDate>'"$(date_rfc_822 "$date")"'</pubDate>
+<title>'"$title"'</title>
+<description><![CDATA[
+
+'"$description"'
+
+]]></description>
+</item>'
+}
+
+
+render_feed() {
+	url="$1"
+	title=$(echo "$2" | remove_nbsp)
+	description="$3"
+
+	base_url="$(echo "$url" | cut -d '/' -f1-3)"
+
+	echo '<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+<channel>
+<atom:link href="'"$url"'" rel="self" type="application/rss+xml" />
+<title>'"$title"'</title>
+<description>'"$description"'</description>
+<link>'"$base_url"'/</link>
+<lastBuildDate>'"$(date_rfc_822 date)"'</lastBuildDate>
+'"$(cat)"'
+</channel></rss>'
+}
+
+
+main "$@"