Ok, I pushed a fix. Essentially, it does the following:
* Try to parse as:
```
#EXTINF:<duration>,<artist> - <title>
```
If any of `artist` or `title` contains the string `" - "` then it falls back to
parsing:
```
#EXTINF:<duration>,<song>
```
`song` is a metadata that is used in `output.{icecast,shoutcast}` `mp3`
metadata. It is otherwise discarded, which should allow metadata from the file
to take precedence with other formats. This is pretty much inline with the
historic relationship between `m3u` playlists and `icy` metadata format from
`shoutcast`.
The only alternative would be to parse as:
```
#EXTINF:<duration>,<title>
```
In the ambiguous case but I'm reluctant to do so since we already know that
there's a good chance this will contain the artist string and thus be incorrect.
Finally, here are the result of the updated parsing:
```
# parse_extinf "#EXTINF:177,ABBA - Money, Money, Money";;
[("artist", "ABBA"); ("title", "Money, Money, Money")]
# parse_extinf "#EXTINF:233,Aerosmith - Pink";;
[("artist", "Aerosmith"); ("title", "Pink")]
# parse_extinf "#EXTINF:160,Blink-182 - California";;
[("artist", "Blink-182"); ("title", "California")]
# parse_extinf "#EXTINF:233,My hot artist - feat. DJ. fancy pants - I looked
for you at the store -- but you weren't there";;
[("song",
"My hot artist - feat. DJ. fancy pants - I looked for you at the store -- but
you weren't there")]
```
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