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To compare the current attributes with the current record, we can use
the helper `EqualAttrs` which will tell us if we need to create a new
record or not.
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When creating a scrobbler, we provide the path to the database. The
scrobbler then get a handler to the database.
When a new record is created, we persist it to the database using the
`save` function.
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Add a new function to create a scrobbler. The function takes care of
creating the mpd client.
Add a function to run the scrobbler, which takes care of creating a new
record when needed.
This will simplify the interface for the caller, as all they really care
about is: create the scrobbler, close it when we're done, and collect
songs information while we listen to our music.
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Let's close both the watcher and the client, instead of leaking this
interface to the user.
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When we receive an event from the player, we look if the song is
different from the previous one, and we create a new record if that's
the case. If the song is similar, there's nothing to do.
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We create a module "mpd" to interact with our MPD instance. For now we
only have a single function to create a new client, which creates an
actual client for mpd (and we ping the instance every 30 seconds), and
a watcher to receive new events.
The tool "scrobbler" then wait for new events and display songs
information.
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