116 lines
2.6 KiB
Bash
116 lines
2.6 KiB
Bash
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#!/bin/bash
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# Generate RSS feed from given post metadata files
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#
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# Copyright (C) 2019 Mike Gerwitz
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# All posts must be provided on the command line as a path to each
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# individual metadata file, in the order in which they should appear in the
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# feed output.
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##
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set -euo pipefail
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# Website root URL.
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declare -r www=${WWW_URL:-https://mikegerwitz.com}
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# Look up metadatum FIELD in metafile FILE.
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pmeta()
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{
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local -r file=${1?Missing metafile name}
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local -r field=${2?Missing field name}
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recsel -P "$field" "$file"
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}
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# Generate RSS item for each post in provided arguments.
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# See `gen-item'.
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gen-items()
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{
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while [ $# -gt 0 ]; do
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gen-item "$1"
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shift
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done
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}
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# Generate RSS item for post in metadata file FILE. The abstract will be
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# used for the item description.
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gen-item()
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{
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local -r file=${1?Missing file name}
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local subject author slug date
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subject=$( pmeta "$file" subject )
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author=$( pmeta "$file" author )
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slug=$( pmeta "$file" slug )
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date=$( pmeta "$file" date )
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# TODO: entire content?
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local abstract
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abstract=$( pmeta "$file" abstract )
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cat <<EOF
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<item>
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<title><![CDATA[$subject]]></title>
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<author><![CDATA[$author]]></author>
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<link>$www/$slug</link>
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<pubDate>$date</pubDate>
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<description><![CDATA[$abstract]]></description>
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</item>
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EOF
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}
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# Output usage information and exit with EX_USAGE.
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usage()
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{
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cat <<EOF
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Usage: $0 postmeta...
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Generate RSS feed from provide post metadata.
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Example: $0 post/2018-01-01-foo.meta post/2018-02-01-bar.meta
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At least one postmeta must be provided.
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EOF
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exit 64 # EX_USAGE
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}
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# Output RSS feed from all post files provide via arguments.
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main()
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{
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test $# -gt 0 || usage
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cat <<EOF
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<?xml version="1.0"?>
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<rss version="2.0">
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<channel>
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<title>Mike Gerwitz's Thoughts and Ramblings</title>
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<link>$www</link>
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<description>
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Posts and articles from a free software hacker and activst with a focus on user privacy and security
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</description>
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$( gen-items "$@" )
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</channel>
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</rss>
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EOF
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}
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main "$@"
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