Add readcomments support.

examples/example.rs

@@ -3,9 +3,22 @@ extern crate mpd;
 use mpd::{Client, Query};
 use std::net::TcpStream;
 
-fn main() {
+fn main() -> Result<(), Box<dyn std::error::Error>> {
     let mut c = Client::new(TcpStream::connect("127.0.0.1:6600").unwrap()).unwrap();
     println!("version: {:?}", c.version);
     println!("status: {:?}", c.status());
     println!("stuff: {:?}", c.find(&Query::new(), (1, 2)));
+
+    let now_playing = c.currentsong()?;
+    if let Some(song) = now_playing {
+        println!("Metadata:");
+        for row in c.readcomments(song)? {
+            if let Ok((k, v)) = row {
+                println!("{}: {}", k, v);
+            }
+        }
+    } else {
+        println!("No song playing.");
+    }
+    Ok(())
 }

src/client.rs

@@ -375,7 +375,7 @@ impl<S: Read + Write> Client<S> {
     // TODO: search type what [...] [window start:end], searchadd type what [...]
     // TODO: listallinfo [uri], listfiles [uri]
     // TODO: list type [filtertype] [filterwhat] [...] [group] [grouptype] [...]
-    // TODO: searchaddpl name type what [...], readcomments
+    // TODO: searchaddpl name type what [...]
 
     /// Find songs matching Query conditions.
     pub fn find<W>(&mut self, query: &Query, window: W) -> Result<Vec<Song>>
@@ -412,6 +412,12 @@ impl<S: Read + Write> Client<S> {
         self.run_command("lsinfo", path).and_then(|_| self.read_struct())
     }
 
+    /// Returns raw metadata for file
+    pub fn readcomments<'a, P: ToSongPath>(&'a mut self, path: P) -> Result<impl Iterator<Item = Result<(String, String)>> + 'a> {
+        self.run_command("readcomments", path)?;
+        Ok(self.read_pairs())
+    }
+
     // }}}
 
     // Output methods {{{