Added dedupe functionality

src/command/dedupe.rs

@@ -1,7 +1,20 @@
 use clap::{Arg, Error, ErrorKind};
 use clap_nested::{Command};
 
-use crate::lib::m3u::{Playlist};
+use crate::lib::m3u::{Playlist, PlaylistTrack};
+use std::collections::HashSet;
+
+fn dedupe(playlist_tracks: Vec<PlaylistTrack>) -> Vec<PlaylistTrack> {
+    let mut seen_tracks: HashSet<String> = HashSet::new();
+    let mut dedupe_playlist_tracks = Vec::new();
+    for track in playlist_tracks {
+        if ! seen_tracks.contains(&track.track) {
+            seen_tracks.insert(String::from(&track.track));
+            dedupe_playlist_tracks.push(track);
+        }
+    }
+    dedupe_playlist_tracks
+}
 
 pub fn get_command<'a>() -> Command<'a, str>{
     Command::new("dedupe")
@@ -20,10 +33,12 @@ pub fn get_command<'a>() -> Command<'a, str>{
                 Some(playlists) => {
                     for path in playlists {
                         let playlist = Playlist::read(path)?;
+                        let dedupe_playlist_tracks: Vec<PlaylistTrack> = dedupe(*playlist.tracks);
+                        let dedupe_playlist = Playlist::new(&path, dedupe_playlist_tracks);
                         if ! dry_run {
-                            playlist.write(path)?
+                            dedupe_playlist.write(path)?
                         } else {
-                            println!("{:?}", playlist);
+                            println!("{:?}", dedupe_playlist);
                         }
                     }
                     Ok(())

src/lib/m3u.rs

@@ -11,9 +11,9 @@ fn read_lines<P>(path: P) -> io::Result<io::Lines<io::BufReader<File>>>
 
 #[derive(Debug)]
 pub struct PlaylistTrack {
-    duration: String,
-    display: String,
-    track: String
+    pub duration: String,
+    pub display: String,
+    pub track: String
 }
 
 impl PlaylistTrack {
@@ -32,8 +32,8 @@ impl PlaylistTrack {
 
 #[derive(Debug)]
 pub struct Playlist {
-    path: String,
-    tracks: Box<Vec<PlaylistTrack>>
+    pub path: String,
+    pub tracks: Box<Vec<PlaylistTrack>>
 }
 
 impl Playlist {