190 lines
6.1 KiB
Bash
190 lines
6.1 KiB
Bash
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#!/usr/bin/env bash
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set -euo pipefail
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if [ $# -ne 1 ]; then
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echo "Usage: $0 <baseURL>" >&2
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echo " <baseURL>: absolute URL prefix for mp3 enclosures" >&2
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echo " e.g. https://example.com/podcast" >&2
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exit 1
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fi
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BASE_URL="${1%/}"
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POSTS_DIR="posts"
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HTML_OUT="index.html"
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XML_OUT="podcast.xml"
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PODCAST_TITLE="Guardian Project Podcast"
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PODCAST_DESC="A small sample podcast from Guardian Project covering decentralized web, privacy-preserving measurement, and content provenance for human rights."
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PODCAST_AUTHOR="Guardian Project"
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PODCAST_LINK="index.html"
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# Extract a single frontmatter field from a markdown file
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fm_get() {
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awk -v key="$2" '
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/^---[[:space:]]*$/ { fm++; if (fm == 2) exit; next }
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fm == 1 {
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i = index($0, ":")
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if (i == 0) next
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k = substr($0, 1, i-1)
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v = substr($0, i+1)
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sub(/^[[:space:]]+/, "", k); sub(/[[:space:]]+$/, "", k)
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sub(/^[[:space:]]+/, "", v); sub(/[[:space:]]+$/, "", v)
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if (k != key) next
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if ((substr(v,1,1)=="\"" && substr(v,length(v))=="\"") || \
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(substr(v,1,1)=="\x27" && substr(v,length(v))=="\x27")) {
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v = substr(v, 2, length(v)-2)
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}
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print v
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exit
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}
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' "$1"
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}
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# Escape text for safe use in HTML/XML element content and attributes
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esc() {
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local s="$1"
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# In bash 5.2+, & in the replacement means "matched text", so escape as \&.
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s="${s//&/\&}"
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s="${s//</\<}"
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s="${s//>/\>}"
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s="${s//\"/\"}"
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printf '%s' "$s"
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}
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# Newest-first list of posts (filenames start with YYYY-MM-DD so sort works)
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mapfile -t POSTS < <(find "$POSTS_DIR" -maxdepth 1 -name '*.md' | sort -r)
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if [ "${#POSTS[@]}" -eq 0 ]; then
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echo "No markdown files found in $POSTS_DIR/" >&2
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exit 1
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fi
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# --- podcast.xml header ---
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{
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cat <<EOF
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<?xml version="1.0" encoding="UTF-8"?>
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<rss version="2.0" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
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<channel>
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<title>$(esc "$PODCAST_TITLE")</title>
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<link>$(esc "$PODCAST_LINK")</link>
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<language>en-us</language>
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<description>$(esc "$PODCAST_DESC")</description>
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<itunes:author>$(esc "$PODCAST_AUTHOR")</itunes:author>
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<itunes:summary>$(esc "$PODCAST_DESC")</itunes:summary>
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<itunes:explicit>no</itunes:explicit>
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EOF
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} > "$XML_OUT"
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# --- index.html header ---
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{
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cat <<EOF
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>$(esc "$PODCAST_TITLE")</title>
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<style>
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body { font-family: system-ui, sans-serif; max-width: 720px; margin: 2em auto; padding: 0 1em; line-height: 1.5; color: #222; }
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h1 { border-bottom: 2px solid #333; padding-bottom: .3em; }
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.episode { border: 1px solid #ddd; border-radius: 6px; padding: 1em 1.2em; margin: 1.2em 0; background: #fafafa; }
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.episode h2 { margin: 0 0 .3em 0; font-size: 1.15em; }
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.meta { color: #666; font-size: .85em; margin-bottom: .6em; }
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audio { width: 100%; margin-top: .5em; }
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.feed-link { font-size: .9em; }
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</style>
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</head>
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<body>
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<h1>$(esc "$PODCAST_TITLE")</h1>
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<p>$(esc "$PODCAST_DESC") <span class="feed-link"><a href="podcast.xml">RSS feed</a></span></p>
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EOF
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} > "$HTML_OUT"
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# --- per-post items ---
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for post in "${POSTS[@]}"; do
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title=$(fm_get "$post" title)
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date_raw=$(fm_get "$post" date)
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desc=$(fm_get "$post" description)
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[ -z "$desc" ] && desc=$(fm_get "$post" summary)
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file=$(fm_get "$post" file)
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voices=$(fm_get "$post" voices)
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keywords=$(fm_get "$post" keywords)
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explicit=$(fm_get "$post" explicit)
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[ -z "$explicit" ] && explicit="no"
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# Duration string is whichever of duration/length looks like HH:MM[:SS].
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# The two fields are used inconsistently across existing posts.
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dur_field=$(fm_get "$post" duration)
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len_field=$(fm_get "$post" length)
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if [[ "$dur_field" =~ ^[0-9]+:[0-9]+(:[0-9]+)?$ ]]; then
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duration="$dur_field"
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elif [[ "$len_field" =~ ^[0-9]+:[0-9]+(:[0-9]+)?$ ]]; then
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duration="$len_field"
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else
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duration=""
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fi
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if [ -z "$file" ]; then
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echo "Warning: no file: field in $post, skipping" >&2
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continue
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fi
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mp3_path="$POSTS_DIR/$file"
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if [ ! -f "$mp3_path" ]; then
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echo "Warning: missing mp3 $mp3_path, skipping $post" >&2
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continue
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fi
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filesize=$(stat -c %s "$mp3_path")
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date_short=$(printf '%s' "$date_raw" | awk '{print $1}')
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# Strip trailing numeric timezone (some posts use "-500" which date(1) rejects)
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date_norm=$(printf '%s' "$date_raw" | sed -E 's/[[:space:]]+[+-]?[0-9]{3,4}$//')
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pubdate=$(date -R -d "$date_norm" 2>/dev/null || date -R -d "$date_short")
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guid="${file%.mp3}"
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# podcast.xml item — enclosure is absolute, everything else is plain text
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{
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printf '\n <item>\n'
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printf ' <title>%s</title>\n' "$(esc "$title")"
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printf ' <description>%s</description>\n' "$(esc "$desc")"
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printf ' <pubDate>%s</pubDate>\n' "$pubdate"
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printf ' <enclosure url="%s/posts/%s" length="%s" type="audio/mpeg"/>\n' \
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"$BASE_URL" "$file" "$filesize"
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printf ' <guid isPermaLink="false">%s</guid>\n' "$(esc "$guid")"
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[ -n "$duration" ] && printf ' <itunes:duration>%s</itunes:duration>\n' "$duration"
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[ -n "$voices" ] && printf ' <itunes:author>%s</itunes:author>\n' "$(esc "$voices")"
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printf ' <itunes:explicit>%s</itunes:explicit>\n' "$(esc "$explicit")"
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[ -n "$keywords" ] && printf ' <itunes:keywords>%s</itunes:keywords>\n' "$(esc "$keywords")"
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printf ' </item>\n'
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} >> "$XML_OUT"
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# index.html article — audio src is a relative path into posts/
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meta="$date_short"
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[ -n "$duration" ] && meta="$meta · $duration"
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[ -n "$voices" ] && meta="$meta · Voices: $(esc "$voices")"
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{
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printf '<article class="episode">\n'
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printf ' <h2>%s</h2>\n' "$(esc "$title")"
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printf ' <div class="meta">%s</div>\n' "$meta"
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printf ' <p>%s</p>\n' "$(esc "$desc")"
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printf ' <audio controls preload="none" src="%s/%s"></audio>\n' "$POSTS_DIR" "$file"
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printf '</article>\n\n'
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} >> "$HTML_OUT"
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done
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# --- close files ---
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cat >> "$XML_OUT" <<EOF
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</channel>
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</rss>
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EOF
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cat >> "$HTML_OUT" <<EOF
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</body>
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</html>
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EOF
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echo "Wrote $XML_OUT and $HTML_OUT (baseURL: $BASE_URL)"
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