inline script

content/blog/2024/09-02-podcast-rss-generator/index.md

@@ -20,9 +20,8 @@ description="An audiobook I like"
 url="https://example.com/ebooks/mine"
 ```
 
-The script:
-[build.sh](build.sh).
-It will create `rss.xml` in that directory.
+The script
+will create `rss.xml` in the directory where you dropped it.
 
 It uses `ffprobe` from ffmpeg to figure out each track's title.
 All my tracks have ID3 tags,
@@ -32,3 +31,68 @@ It can deal with spaces in filenames,
 but not double-quotes.
 `&` and `<` might cause problems too.
 Anyway, it's good enough for me.
+
+`build.sh`:
+```sh
+#! /bin/sh
+
+set -e
+
+cd $(dirname $0)
+. config.sh
+
+out="rss.xml"
+exec 1>$out
+echo "Writing to $out" 1>&2
+
+cat <<EOF
+<?xml version="1.0" encoding="utf-8"?>
+<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
+  <channel>
+    <title>$title</title>
+    <link>$url</link>
+    <language>en</language>
+    <description>$description</description>
+    <atom:link href="$url/$out" rel="self" type="application/rss+xml" />
+EOF
+
+if [ -f cover.jpg ]; then
+  cat <<EOF
+    <image>
+      <url>$url/cover.jpg</url>
+      <title>$title</title>
+      <link>$url</link>
+    </image>
+EOF
+fi
+
+for fn in *.mp3; do
+  echo "- $fn" 1>&2
+
+  ffprobe -loglevel quiet -show_entries format -output_format json "$fn" > format.json
+  title=$(cat format.json | jq -r '.format.tags.title')
+  duration=$(cat format.json | jq -r '.format.duration | tonumber | ceil')
+  #bps=$(cat format.json | jq -r '.format.bit_rate')
+  #kbps=$(($bps / 1000))
+  rm format.json
+  guid=$(sha1sum "$fn" | awk '{print $1}')
+  size=$(stat -c %s "$fn")
+  mtime=$(date -R -d @$(stat -c %Y "$fn"))
+  ufn=$(echo $fn | tr ' ' '+')
+
+  cat <<EOF
+    <item>
+      <title>$title</title>
+      <pubDate>$mtime</pubDate>
+      <itunes:duration>$duration</itunes:duration>
+      <enclosure url="$url/$ufn" type="audio/mpeg" length="$size" />
+      <guid isPermaLink="false">$guid</guid>
+    </item>
+EOF
+done
+
+cat <<EOF
+  </channel>
+</rss>
+EOF
+```