Merge pull request #76 from Herbstein/commander

Move to enum-based commands

src/command.rs

@@ -0,0 +1,219 @@
+use queue::RepeatSetting;
+use std::collections::HashMap;
+use std::iter::FromIterator;
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum PlaylistCommands {
+    Update,
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum SeekInterval {
+    Forward,
+    Backwards,
+    Custom(usize),
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum TargetMode {
+    Current,
+    Selected,
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum MoveMode {
+    Up,
+    Down,
+    Left,
+    Right,
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum ShiftMode {
+    Up,
+    Down,
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum GotoMode {
+    Album,
+    Artist,
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum SeekDirection {
+    Relative(i32),
+    Absolute(u32),
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub enum Command {
+    Quit,
+    TogglePlay,
+    Playlists(PlaylistCommands),
+    Stop,
+    Previous,
+    Next,
+    Clear,
+    Queue,
+    Play,
+    Save,
+    SaveQueue,
+    Delete,
+    Focus(String),
+    Seek(SeekDirection),
+    Repeat(Option<RepeatSetting>),
+    Shuffle(Option<bool>),
+    Share(TargetMode),
+    Back,
+    Open,
+    Goto(GotoMode),
+    Move(MoveMode, Option<i32>),
+    Shift(ShiftMode, Option<i32>),
+    Search(String),
+}
+
+fn register_aliases(map: &mut HashMap<&str, &str>, cmd: &'static str, names: Vec<&'static str>) {
+    for a in names {
+        map.insert(a, cmd);
+    }
+}
+
+lazy_static! {
+    static ref ALIASES: HashMap<&'static str, &'static str> = {
+        let mut m = HashMap::new();
+
+        register_aliases(&mut m, "quit", vec!["q", "x"]);
+        register_aliases(
+            &mut m,
+            "playpause",
+            vec!["pause", "toggleplay", "toggleplayback"],
+        );
+        register_aliases(&mut m, "repeat", vec!["loop"]);
+
+        m.insert("1", "foo");
+        m.insert("2", "bar");
+        m.insert("3", "baz");
+        m
+    };
+}
+
+fn handle_aliases(input: &str) -> &str {
+    if let Some(cmd) = ALIASES.get(input) {
+        handle_aliases(cmd)
+    } else {
+        input
+    }
+}
+
+pub fn parse(input: &str) -> Option<Command> {
+    let components: Vec<_> = input.trim().split(' ').collect();
+
+    let command = handle_aliases(&components[0]);
+    let args = components[1..].to_vec();
+
+    match command {
+        "quit" => Some(Command::Quit),
+        "playpause" => Some(Command::TogglePlay),
+        "stop" => Some(Command::Stop),
+        "previous" => Some(Command::Previous),
+        "next" => Some(Command::Next),
+        "clear" => Some(Command::Clear),
+        "queue" => Some(Command::Queue),
+        "play" => Some(Command::Play),
+        "delete" => Some(Command::Delete),
+        "back" => Some(Command::Back),
+        "open" => Some(Command::Open),
+        "search" => args.get(0).map(|query| Command::Search(query.to_string())),
+        "shift" => {
+            let amount = args.get(1).and_then(|amount| amount.parse().ok());
+
+            args.get(0)
+                .and_then(|direction| match *direction {
+                    "up" => Some(ShiftMode::Up),
+                    "down" => Some(ShiftMode::Down),
+                    _ => None,
+                })
+                .map(|mode| Command::Shift(mode, amount))
+        }
+        "move" => {
+            let amount = args.get(1).and_then(|amount| amount.parse().ok());
+
+            args.get(0)
+                .and_then(|direction| match *direction {
+                    "up" => Some(MoveMode::Up),
+                    "down" => Some(MoveMode::Down),
+                    "left" => Some(MoveMode::Left),
+                    "right" => Some(MoveMode::Right),
+                    _ => None,
+                })
+                .map(|mode| Command::Move(mode, amount))
+        }
+        "goto" => args
+            .get(0)
+            .and_then(|mode| match *mode {
+                "album" => Some(GotoMode::Album),
+                "artist" => Some(GotoMode::Artist),
+                _ => None,
+            })
+            .map(Command::Goto),
+        "share" => args
+            .get(0)
+            .and_then(|target| match *target {
+                "selected" => Some(TargetMode::Selected),
+                "current" => Some(TargetMode::Current),
+                _ => None,
+            })
+            .map(Command::Share),
+        "shuffle" => {
+            let shuffle = args.get(0).and_then(|mode| match *mode {
+                "on" => Some(true),
+                "off" => Some(false),
+                _ => None,
+            });
+
+            Some(Command::Shuffle(shuffle))
+        }
+        "repeat" => {
+            let mode = args.get(0).and_then(|mode| match *mode {
+                "list" | "playlist" | "queue" => Some(RepeatSetting::RepeatPlaylist),
+                "track" | "once" => Some(RepeatSetting::RepeatTrack),
+                "none" | "off" => Some(RepeatSetting::None),
+                _ => None,
+            });
+
+            Some(Command::Repeat(mode))
+        }
+        "seek" => args.get(0).and_then(|arg| match arg.chars().nth(0) {
+            Some(x) if x == '-' || x == '+' => String::from_iter(arg.chars().skip(1))
+                .parse::<i32>()
+                .ok()
+                .map(|amount| {
+                    Command::Seek(SeekDirection::Relative(
+                        amount
+                            * match x {
+                                '-' => -1,
+                                _ => 1,
+                            },
+                    ))
+                }),
+            _ => String::from_iter(arg.chars())
+                .parse()
+                .ok()
+                .map(|amount| Command::Seek(SeekDirection::Absolute(amount))),
+        }),
+        "focus" => args.get(0).map(|target| Command::Focus(target.to_string())),
+        "playlists" => args
+            .get(0)
+            .and_then(|action| match *action {
+                "update" => Some(PlaylistCommands::Update),
+                _ => None,
+            })
+            .map(Command::Playlists),
+        "save" => args.get(0).map(|target| match *target {
+            "queue" => Command::SaveQueue,
+            _ => Command::Save,
+        }),
+        _ => None,
+    }
+}

src/commands.rs

@@ -2,18 +2,18 @@ use std::collections::HashMap;
 use std::sync::Arc;
 use std::time::Duration;
 
+use command::{
+    Command, GotoMode, MoveMode, PlaylistCommands, SeekDirection, ShiftMode, TargetMode,
+};
 use cursive::event::{Event, Key};
 use cursive::views::ViewRef;
 use cursive::Cursive;
-
 use library::Library;
 use queue::{Queue, RepeatSetting};
 use spotify::Spotify;
 use traits::ViewExt;
 use ui::layout::Layout;
 
-type CommandCb = dyn Fn(&mut Cursive, &[String]) -> Result<Option<String>, String>;
-
 pub enum CommandResult {
     Consumed(Option<String>),
     View(Box<dyn ViewExt>),
@@ -21,22 +21,22 @@ pub enum CommandResult {
 }
 
 pub struct CommandManager {
-    callbacks: HashMap<String, Option<Box<CommandCb>>>,
     aliases: HashMap<String, String>,
+    spotify: Arc<Spotify>,
+    queue: Arc<Queue>,
+    library: Arc<Library>,
 }
 
 impl CommandManager {
-    pub fn new() -> CommandManager {
+    pub fn new(spotify: Arc<Spotify>, queue: Arc<Queue>, library: Arc<Library>) -> CommandManager {
         CommandManager {
-            callbacks: HashMap::new(),
             aliases: HashMap::new(),
+            spotify,
+            queue,
+            library,
         }
     }
 
-    pub fn register_command<S: Into<String>>(&mut self, name: S, cb: Option<Box<CommandCb>>) {
-        self.callbacks.insert(name.into(), cb);
-    }
-
     pub fn register_aliases<S: Into<String>>(&mut self, name: S, aliases: Vec<S>) {
         let name = name.into();
         for a in aliases {
@@ -44,198 +44,92 @@ impl CommandManager {
         }
     }
 
-    pub fn register_all(
-        &mut self,
-        spotify: Arc<Spotify>,
-        queue: Arc<Queue>,
-        library: Arc<Library>,
-    ) {
+    pub fn register_all(&mut self) {
         self.register_aliases("quit", vec!["q", "x"]);
         self.register_aliases("playpause", vec!["pause", "toggleplay", "toggleplayback"]);
         self.register_aliases("repeat", vec!["loop"]);
-
-        self.register_command("search", None);
-        self.register_command("move", None);
-        self.register_command("shift", None);
-        self.register_command("play", None);
-        self.register_command("queue", None);
-        self.register_command("save", None);
-        self.register_command("delete", None);
-        self.register_command("back", None);
-        self.register_command("open", None);
-        self.register_command("goto", None);
-
-        self.register_command(
-            "quit",
-            Some(Box::new(move |s, _args| {
-                s.quit();
-                Ok(None)
-            })),
-        );
-
-        {
-            let queue = queue.clone();
-            self.register_command(
-                "stop",
-                Some(Box::new(move |_s, _args| {
-                    queue.stop();
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let queue = queue.clone();
-            let spotify = spotify.clone();
-            self.register_command(
-                "previous",
-                Some(Box::new(move |_s, _args| {
-                    if spotify.get_current_progress() < Duration::from_secs(5) {
-                        queue.previous();
-                    } else {
-                        spotify.seek(0);
-                    }
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let queue = queue.clone();
-            self.register_command(
-                "next",
-                Some(Box::new(move |_s, _args| {
-                    queue.next(true);
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let queue = queue.clone();
-            self.register_command(
-                "clear",
-                Some(Box::new(move |_s, _args| {
-                    queue.clear();
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let library = library.clone();
-            self.register_command(
-                "playlists",
-                Some(Box::new(move |_s, args| {
-                    if let Some(arg) = args.get(0) {
-                        if arg == "update" {
-                            library.update_playlists();
-                        }
-                    }
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let queue = queue.clone();
-            self.register_command(
-                "playpause",
-                Some(Box::new(move |_s, _args| {
-                    queue.toggleplayback();
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let queue = queue.clone();
-            self.register_command(
-                "shuffle",
-                Some(Box::new(move |_s, args| {
-                    if let Some(arg) = args.get(0) {
-                        queue.set_shuffle(match arg.as_ref() {
-                            "on" => true,
-                            "off" => false,
-                            _ => {
-                                return Err("Unknown shuffle setting.".to_string());
-                            }
-                        });
-                    } else {
-                        queue.set_shuffle(!queue.get_shuffle());
-                    }
-
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let queue = queue.clone();
-            self.register_command(
-                "repeat",
-                Some(Box::new(move |_s, args| {
-                    if let Some(arg) = args.get(0) {
-                        queue.set_repeat(match arg.as_ref() {
-                            "list" | "playlist" | "queue" => RepeatSetting::RepeatPlaylist,
-                            "track" | "once" => RepeatSetting::RepeatTrack,
-                            "none" | "off" => RepeatSetting::None,
-                            _ => {
-                                return Err("Unknown loop setting.".to_string());
-                            }
-                        });
-                    } else {
-                        queue.set_repeat(match queue.get_repeat() {
-                            RepeatSetting::None => RepeatSetting::RepeatPlaylist,
-                            RepeatSetting::RepeatPlaylist => RepeatSetting::RepeatTrack,
-                            RepeatSetting::RepeatTrack => RepeatSetting::None,
-                        });
-                    }
-
-                    Ok(None)
-                })),
-            );
-        }
-
-        {
-            let spotify = spotify.clone();
-            self.register_command(
-                "seek",
-                Some(Box::new(move |_s, args| {
-                    if let Some(arg) = args.get(0) {
-                        match arg.chars().next().unwrap() {
-                            '+' | '-' => {
-                                spotify.seek_relative(arg.parse::<i32>().unwrap_or(0));
-                            }
-                            _ => {
-                                spotify.seek(arg.parse::<u32>().unwrap_or(0));
-                            }
-                        }
-                    }
-
-                    Ok(None)
-                })),
-            );
-        }
     }
 
-    fn handle_aliases(&self, name: &str) -> String {
-        if let Some(s) = self.aliases.get(name) {
-            self.handle_aliases(s)
-        } else {
-            name.to_string()
-        }
-    }
-
-    fn handle_callbacks(
+    fn handle_default_commands(
         &self,
         s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
+        cmd: &Command,
     ) -> Result<Option<String>, String> {
+        match cmd {
+            Command::Quit => {
+                s.quit();
+                Ok(None)
+            }
+            Command::Stop => {
+                self.queue.stop();
+                Ok(None)
+            }
+            Command::Previous => {
+                if self.spotify.get_current_progress() < Duration::from_secs(5) {
+                    self.queue.previous();
+                } else {
+                    self.spotify.seek(0);
+                }
+                Ok(None)
+            }
+            Command::Next => {
+                self.queue.next(true);
+                Ok(None)
+            }
+            Command::Clear => {
+                self.queue.clear();
+                Ok(None)
+            }
+            Command::Playlists(mode) => {
+                match mode {
+                    PlaylistCommands::Update => self.library.update_playlists(),
+                }
+                Ok(None)
+            }
+            Command::TogglePlay => {
+                self.queue.toggleplayback();
+                Ok(None)
+            }
+            Command::Shuffle(mode) => {
+                let mode = mode.unwrap_or_else(|| !self.queue.get_shuffle());
+                self.queue.set_shuffle(mode);
+                Ok(None)
+            }
+            Command::Repeat(mode) => {
+                let mode = mode.unwrap_or_else(|| match self.queue.get_repeat() {
+                    RepeatSetting::None => RepeatSetting::RepeatPlaylist,
+                    RepeatSetting::RepeatPlaylist => RepeatSetting::RepeatTrack,
+                    RepeatSetting::RepeatTrack => RepeatSetting::None,
+                });
+
+                self.queue.set_repeat(mode);
+                Ok(None)
+            }
+            Command::Seek(direction) => {
+                match *direction {
+                    SeekDirection::Relative(rel) => self.spotify.seek_relative(rel),
+                    SeekDirection::Absolute(abs) => self.spotify.seek(abs),
+                }
+                Ok(None)
+            }
+            Command::Search(_)
+            | Command::Move(_, _)
+            | Command::Shift(_, _)
+            | Command::Play
+            | Command::Queue
+            | Command::Save
+            | Command::Delete
+            | Command::Back
+            | Command::Open
+            | Command::Goto(_) => Ok(None),
+            _ => Err("Unknown Command".into()),
+        }
+    }
+
+    fn handle_callbacks(&self, s: &mut Cursive, cmd: &Command) -> Result<Option<String>, String> {
         let local = {
             let mut main: ViewRef<Layout> = s.find_id("main").unwrap();
-            main.on_command(s, cmd, args)?
+            main.on_command(s, cmd)?
         };
 
         if let CommandResult::Consumed(output) = local {
@@ -246,24 +140,13 @@ impl CommandManager {
             });
 
             Ok(None)
-        } else if let Some(callback) = self.callbacks.get(cmd) {
-            callback.as_ref().map(|cb| cb(s, args)).unwrap_or(Ok(None))
         } else {
-            Err("Unknown command.".to_string())
+            self.handle_default_commands(s, cmd)
         }
     }
 
-    pub fn handle(&self, s: &mut Cursive, cmd: String) {
-        let components: Vec<String> = cmd
-            .trim()
-            .split(' ')
-            .map(std::string::ToString::to_string)
-            .collect();
-
-        let cmd = self.handle_aliases(&components[0]);
-        let args = components[1..].to_vec();
-
-        let result = self.handle_callbacks(s, &cmd, &args);
+    pub fn handle(&self, s: &mut Cursive, cmd: Command) {
+        let result = self.handle_callbacks(s, &cmd);
 
         s.call_on_id("main", |v: &mut Layout| {
             v.set_result(result);
@@ -272,22 +155,21 @@ impl CommandManager {
         s.on_event(Event::Refresh);
     }
 
-    pub fn register_keybinding<E: Into<cursive::event::Event>, S: Into<String>>(
+    pub fn register_keybinding<E: Into<cursive::event::Event>>(
         this: Arc<Self>,
         cursive: &mut Cursive,
         event: E,
-        command: S,
+        command: Command,
     ) {
-        let cmd = command.into();
         cursive.add_global_callback(event, move |s| {
-            this.handle(s, cmd.clone());
+            this.handle(s, command.clone());
         });
     }
 
     pub fn register_keybindings(
         this: Arc<Self>,
         cursive: &mut Cursive,
-        keybindings: Option<HashMap<String, String>>,
+        keybindings: Option<HashMap<String, Command>>,
     ) {
         let mut kb = Self::default_keybindings();
         kb.extend(keybindings.unwrap_or_default());
@@ -301,51 +183,51 @@ impl CommandManager {
         }
     }
 
-    fn default_keybindings() -> HashMap<String, String> {
+    fn default_keybindings() -> HashMap<String, Command> {
         let mut kb = HashMap::new();
 
-        kb.insert("q".into(), "quit".into());
-        kb.insert("P".into(), "toggleplay".into());
-        kb.insert("R".into(), "playlists update".into());
-        kb.insert("S".into(), "stop".into());
-        kb.insert("<".into(), "previous".into());
-        kb.insert(">".into(), "next".into());
-        kb.insert("c".into(), "clear".into());
-        kb.insert(" ".into(), "queue".into());
-        kb.insert("Enter".into(), "play".into());
-        kb.insert("s".into(), "save".into());
-        kb.insert("Ctrl+s".into(), "save queue".into());
-        kb.insert("d".into(), "delete".into());
-        kb.insert("/".into(), "focus search".into());
-        kb.insert(".".into(), "seek +500".into());
-        kb.insert(",".into(), "seek -500".into());
-        kb.insert("r".into(), "repeat".into());
-        kb.insert("z".into(), "shuffle".into());
-        kb.insert("x".into(), "share current".into());
-        kb.insert("Shift+x".into(), "share selected".into());
+        kb.insert("q".into(), Command::Quit);
+        kb.insert("P".into(), Command::TogglePlay);
+        kb.insert("R".into(), Command::Playlists(PlaylistCommands::Update));
+        kb.insert("S".into(), Command::Stop);
+        kb.insert("<".into(), Command::Previous);
+        kb.insert(">".into(), Command::Next);
+        kb.insert("c".into(), Command::Clear);
+        kb.insert(" ".into(), Command::Queue);
+        kb.insert("Enter".into(), Command::Play);
+        kb.insert("s".into(), Command::Save);
+        kb.insert("Ctrl+s".into(), Command::SaveQueue);
+        kb.insert("d".into(), Command::Delete);
+        kb.insert("/".into(), Command::Focus("search".into()));
+        kb.insert(".".into(), Command::Seek(SeekDirection::Relative(500)));
+        kb.insert(",".into(), Command::Seek(SeekDirection::Relative(-500)));
+        kb.insert("r".into(), Command::Repeat(None));
+        kb.insert("z".into(), Command::Shuffle(None));
+        kb.insert("x".into(), Command::Share(TargetMode::Current));
+        kb.insert("Shift+x".into(), Command::Share(TargetMode::Selected));
 
-        kb.insert("F1".into(), "focus queue".into());
-        kb.insert("F2".into(), "focus search".into());
-        kb.insert("F3".into(), "focus library".into());
-        kb.insert("Backspace".into(), "back".into());
+        kb.insert("F1".into(), Command::Focus("queue".into()));
+        kb.insert("F2".into(), Command::Focus("search".into()));
+        kb.insert("F3".into(), Command::Focus("library".into()));
+        kb.insert("Backspace".into(), Command::Back);
 
-        kb.insert("o".into(), "open".into());
-        kb.insert("a".into(), "goto album".into());
-        kb.insert("A".into(), "goto artist".into());
+        kb.insert("o".into(), Command::Open);
+        kb.insert("a".into(), Command::Goto(GotoMode::Album));
+        kb.insert("A".into(), Command::Goto(GotoMode::Artist));
 
-        kb.insert("Up".into(), "move up".into());
-        kb.insert("Down".into(), "move down".into());
-        kb.insert("Left".into(), "move left".into());
-        kb.insert("Right".into(), "move right".into());
-        kb.insert("PageUp".into(), "move up 5".into());
-        kb.insert("PageDown".into(), "move down 5".into());
-        kb.insert("k".into(), "move up".into());
-        kb.insert("j".into(), "move down".into());
-        kb.insert("h".into(), "move left".into());
-        kb.insert("l".into(), "move right".into());
+        kb.insert("Up".into(), Command::Move(MoveMode::Up, None));
+        kb.insert("Down".into(), Command::Move(MoveMode::Down, None));
+        kb.insert("Left".into(), Command::Move(MoveMode::Left, None));
+        kb.insert("Right".into(), Command::Move(MoveMode::Right, None));
+        kb.insert("PageUp".into(), Command::Move(MoveMode::Up, Some(5)));
+        kb.insert("PageDown".into(), Command::Move(MoveMode::Down, Some(5)));
+        kb.insert("k".into(), Command::Move(MoveMode::Up, None));
+        kb.insert("j".into(), Command::Move(MoveMode::Down, None));
+        kb.insert("h".into(), Command::Move(MoveMode::Left, None));
+        kb.insert("l".into(), Command::Move(MoveMode::Right, None));
 
-        kb.insert("Shift+Up".into(), "shift up".into());
-        kb.insert("Shift+Down".into(), "shift down".into());
+        kb.insert("Shift+Up".into(), Command::Shift(ShiftMode::Up, None));
+        kb.insert("Shift+Down".into(), Command::Shift(ShiftMode::Down, None));
 
         kb
     }

src/config.rs

@@ -3,13 +3,14 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::sync::RwLock;
 
+use command::Command;
 use directories::ProjectDirs;
 
 pub const CLIENT_ID: &str = "d420a117a32841c2b3474932e49fb54b";
 
 #[derive(Serialize, Deserialize, Debug, Default)]
 pub struct Config {
-    pub keybindings: Option<HashMap<String, String>>,
+    pub keybindings: Option<HashMap<String, Command>>,
     pub theme: Option<ConfigTheme>,
     pub use_nerdfont: Option<bool>,
 }

src/main.rs

@@ -46,6 +46,7 @@ use librespot::core::authentication::Credentials;
 mod album;
 mod artist;
 mod authentication;
+mod command;
 mod commands;
 mod config;
 mod events;
@@ -183,8 +184,8 @@ fn main() {
         cfg.use_nerdfont.unwrap_or(false),
     ));
 
-    let mut cmd_manager = CommandManager::new();
-    cmd_manager.register_all(spotify.clone(), queue.clone(), library.clone());
+    let mut cmd_manager = CommandManager::new(spotify.clone(), queue.clone(), library.clone());
+    cmd_manager.register_all();
 
     let cmd_manager = Arc::new(cmd_manager);
     CommandManager::register_keybindings(
@@ -240,7 +241,11 @@ fn main() {
                 let mut main = s.find_id::<ui::layout::Layout>("main").unwrap();
                 main.clear_cmdline();
             }
-            cmd_manager.handle(s, cmd.to_string()[1..].to_string());
+            let c = &cmd[1..];
+            let parsed = command::parse(c);
+            if let Some(parsed) = parsed {
+                cmd_manager.handle(s, parsed);
+            }
             ev.trigger();
         });
     }

src/queue.rs

@@ -5,7 +5,7 @@ use rand::prelude::*;
 use spotify::Spotify;
 use track::Track;
 
-#[derive(Clone, Copy, PartialEq)]
+#[derive(Clone, Copy, PartialEq, Debug, Serialize, Deserialize)]
 pub enum RepeatSetting {
     None,
     RepeatPlaylist,

src/traits.rs

@@ -6,6 +6,7 @@ use cursive::Cursive;
 
 use album::Album;
 use artist::Artist;
+use command::Command;
 use commands::CommandResult;
 use library::Library;
 use queue::Queue;
@@ -34,25 +35,14 @@ pub trait ViewExt: View {
         "".into()
     }
 
-    fn on_command(
-        &mut self,
-        _s: &mut Cursive,
-        _cmd: &str,
-        _args: &[String],
-    ) -> Result<CommandResult, String> {
+    fn on_command(&mut self, _s: &mut Cursive, _cmd: &Command) -> Result<CommandResult, String> {
         Ok(CommandResult::Ignored)
     }
 }
 
 impl<V: ViewExt> ViewExt for IdView<V> {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        self.with_view_mut(move |v| v.on_command(s, cmd, args))
-            .unwrap()
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        self.with_view_mut(move |v| v.on_command(s, cmd)).unwrap()
     }
 }
 

src/ui/album.rs

@@ -5,6 +5,7 @@ use cursive::Cursive;
 
 use album::Album;
 use artist::Artist;
+use command::Command;
 use commands::CommandResult;
 use library::Library;
 use queue::Queue;
@@ -69,12 +70,7 @@ impl ViewExt for AlbumView {
         format!("{} ({})", self.album.title, self.album.year)
     }
 
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        self.tabs.on_command(s, cmd, args)
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        self.tabs.on_command(s, cmd)
     }
 }

src/ui/artist.rs

@@ -5,6 +5,7 @@ use cursive::view::ViewWrapper;
 use cursive::Cursive;
 
 use artist::Artist;
+use command::Command;
 use commands::CommandResult;
 use library::Library;
 use queue::Queue;
@@ -110,12 +111,7 @@ impl ViewExt for ArtistView {
         self.artist.name.clone()
     }
 
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        self.tabs.on_command(s, cmd, args)
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        self.tabs.on_command(s, cmd)
     }
 }

src/ui/layout.rs

@@ -12,6 +12,7 @@ use cursive::views::EditView;
 use cursive::{Cursive, Printer};
 use unicode_width::UnicodeWidthStr;
 
+use command::Command;
 use commands::CommandResult;
 use events;
 use traits::{IntoBoxedViewExt, ViewExt};
@@ -205,6 +206,25 @@ impl View for Layout {
         }
     }
 
+    fn layout(&mut self, size: Vec2) {
+        self.last_size = size;
+
+        self.statusbar.layout(Vec2::new(size.x, 2));
+
+        self.cmdline.layout(Vec2::new(size.x, 1));
+
+        if let Some(screen) = self.get_current_screen_mut() {
+            screen.view.layout(Vec2::new(size.x, size.y - 3));
+        }
+
+        // the focus view has changed, let the views know so they can redraw
+        // their items
+        if self.screenchange {
+            debug!("layout: new screen selected: {:?}", self.focus);
+            self.screenchange = false;
+        }
+    }
+
     fn required_size(&mut self, constraint: Vec2) -> Vec2 {
         Vec2::new(constraint.x, constraint.y)
     }
@@ -244,25 +264,6 @@ impl View for Layout {
         }
     }
 
-    fn layout(&mut self, size: Vec2) {
-        self.last_size = size;
-
-        self.statusbar.layout(Vec2::new(size.x, 2));
-
-        self.cmdline.layout(Vec2::new(size.x, 1));
-
-        if let Some(screen) = self.get_current_screen_mut() {
-            screen.view.layout(Vec2::new(size.x, size.y - 3));
-        }
-
-        // the focus view has changed, let the views know so they can redraw
-        // their items
-        if self.screenchange {
-            debug!("layout: new screen selected: {:?}", self.focus);
-            self.screenchange = false;
-        }
-    }
-
     fn call_on_any<'a>(&mut self, s: &Selector, c: AnyCb<'a>) {
         if let Some(screen) = self.get_current_screen_mut() {
             screen.view.call_on_any(s, c);
@@ -283,29 +284,28 @@ impl View for Layout {
 }
 
 impl ViewExt for Layout {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        if cmd == "focus" {
-            if let Some(view) = args.get(0) {
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        match cmd {
+            Command::Focus(view) => {
                 if self.views.keys().any(|k| k == view) {
                     self.set_view(view.clone());
                     let screen = self.views.get_mut(view).unwrap();
-                    screen.view.on_command(s, cmd, args)?;
+                    screen.view.on_command(s, cmd)?;
+                }
+
+                Ok(CommandResult::Consumed(None))
+            }
+            Command::Back => {
+                self.pop_view();
+                Ok(CommandResult::Consumed(None))
+            }
+            _ => {
+                if let Some(screen) = self.get_current_screen_mut() {
+                    screen.view.on_command(s, cmd)
+                } else {
+                    Ok(CommandResult::Ignored)
                 }
             }
-
-            Ok(CommandResult::Consumed(None))
-        } else if cmd == "back" {
-            self.pop_view();
-            Ok(CommandResult::Consumed(None))
-        } else if let Some(screen) = self.get_current_screen_mut() {
-            screen.view.on_command(s, cmd, args)
-        } else {
-            Ok(CommandResult::Ignored)
         }
     }
 }

src/ui/library.rs

@@ -3,6 +3,7 @@ use std::sync::Arc;
 use cursive::view::ViewWrapper;
 use cursive::Cursive;
 
+use command::Command;
 use commands::CommandResult;
 use library::Library;
 use queue::Queue;
@@ -48,12 +49,7 @@ impl ViewWrapper for LibraryView {
 }
 
 impl ViewExt for LibraryView {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        self.tabs.on_command(s, cmd, args)
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        self.tabs.on_command(s, cmd)
     }
 }

src/ui/listview.rs

@@ -10,6 +10,7 @@ use cursive::{Cursive, Printer, Rect, Vec2};
 use unicode_width::UnicodeWidthStr;
 
 use clipboard::{ClipboardContext, ClipboardProvider};
+use command::{Command, GotoMode, MoveMode, TargetMode};
 use commands::CommandResult;
 use library::Library;
 use queue::Queue;
@@ -277,123 +278,116 @@ impl<I: ListItem> View for ListView<I> {
 }
 
 impl<I: ListItem + Clone> ViewExt for ListView<I> {
-    fn on_command(
-        &mut self,
-        _s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        if cmd == "play" {
-            self.queue.clear();
+    fn on_command(&mut self, _s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        match cmd {
+            Command::Play => {
+                self.queue.clear();
 
-            if !self.attempt_play_all_tracks() {
+                if !self.attempt_play_all_tracks() {
+                    let mut content = self.content.write().unwrap();
+                    if let Some(item) = content.get_mut(self.selected) {
+                        item.play(self.queue.clone());
+                    }
+                }
+
+                return Ok(CommandResult::Consumed(None));
+            }
+            Command::Queue => {
                 let mut content = self.content.write().unwrap();
                 if let Some(item) = content.get_mut(self.selected) {
-                    item.play(self.queue.clone());
+                    item.queue(self.queue.clone());
+                }
+
+                return Ok(CommandResult::Consumed(None));
+            }
+            Command::Save => {
+                let mut item = {
+                    let content = self.content.read().unwrap();
+                    content.get(self.selected).cloned()
+                };
+
+                if let Some(item) = item.as_mut() {
+                    item.toggle_saved(self.library.clone());
                 }
             }
 
-            return Ok(CommandResult::Consumed(None));
-        }
-
-        if cmd == "queue" {
-            let mut content = self.content.write().unwrap();
-            if let Some(item) = content.get_mut(self.selected) {
-                item.queue(self.queue.clone());
-            }
-            return Ok(CommandResult::Consumed(None));
-        }
-
-        if cmd == "save" {
-            let mut item = {
-                let content = self.content.read().unwrap();
-                content.get(self.selected).cloned()
-            };
-
-            if let Some(item) = item.as_mut() {
-                item.toggle_saved(self.library.clone());
-            }
-        }
-
-        if cmd == "share" {
-            let source = args.get(0);
-            let url =
-                source.and_then(|source| match source.as_str() {
-                    "selected" => self.content.read().ok().and_then(|content| {
+            Command::Share(mode) => {
+                let url = match mode {
+                    TargetMode::Selected => self.content.read().ok().and_then(|content| {
                         content.get(self.selected).and_then(ListItem::share_url)
                     }),
-                    "current" => self.queue.get_current().and_then(|t| t.share_url()),
-                    _ => None,
-                });
+                    TargetMode::Current => self.queue.get_current().and_then(|t| t.share_url()),
+                };
 
-            if let Some(url) = url {
-                ClipboardProvider::new()
-                    .and_then(|mut ctx: ClipboardContext| ctx.set_contents(url))
-                    .ok();
-            };
+                if let Some(url) = url {
+                    ClipboardProvider::new()
+                        .and_then(|mut ctx: ClipboardContext| ctx.set_contents(url))
+                        .ok();
+                }
 
-            return Ok(CommandResult::Consumed(None));
-        }
-
-        if cmd == "move" {
-            if let Some(dir) = args.get(0) {
-                let amount: usize = args
-                    .get(1)
-                    .unwrap_or(&"1".to_string())
-                    .parse()
-                    .map_err(|e| format!("{:?}", e))?;
+                return Ok(CommandResult::Consumed(None));
+            }
+            Command::Move(mode, amount) => {
+                let amount = match amount {
+                    Some(amount) => *amount,
+                    _ => 1,
+                };
 
                 let len = self.content.read().unwrap().len();
 
-                if dir == "up" && self.selected > 0 {
-                    self.move_focus(-(amount as i32));
-                    return Ok(CommandResult::Consumed(None));
-                }
-
-                if dir == "down" {
-                    if self.selected < len.saturating_sub(1) {
+                match mode {
+                    MoveMode::Up if self.selected > 0 => {
+                        self.move_focus(-(amount as i32));
+                        return Ok(CommandResult::Consumed(None));
+                    }
+                    MoveMode::Down if self.selected < len.saturating_sub(1) => {
                         self.move_focus(amount as i32);
                         return Ok(CommandResult::Consumed(None));
-                    } else if self.selected == len.saturating_sub(1) && self.can_paginate() {
+                    }
+                    MoveMode::Down
+                        if self.selected == len.saturating_sub(1) && self.can_paginate() =>
+                    {
                         self.pagination.call(&self.content);
                     }
+                    _ => {}
                 }
             }
-        }
-
-        if cmd == "open" {
-            let mut content = self.content.write().unwrap();
-            if let Some(item) = content.get_mut(self.selected) {
-                let queue = self.queue.clone();
-                let library = self.library.clone();
-                if let Some(view) = item.open(queue, library) {
-                    return Ok(CommandResult::View(view));
-                }
-            }
-        }
-
-        if cmd == "goto" {
-            let mut content = self.content.write().unwrap();
-            if let Some(item) = content.get_mut(self.selected) {
-                let queue = self.queue.clone();
-                let library = self.library.clone();
-                let arg = args.get(0).cloned().unwrap_or_default();
-
-                if arg == "album" {
-                    if let Some(album) = item.album(queue.clone()) {
-                        let view = AlbumView::new(queue, library, &album).as_boxed_view_ext();
-                        return Ok(CommandResult::View(view));
-                    }
-                }
-
-                if arg == "artist" {
-                    if let Some(artist) = item.artist() {
-                        let view = ArtistView::new(queue, library, &artist).as_boxed_view_ext();
+            Command::Open => {
+                let mut content = self.content.write().unwrap();
+                if let Some(item) = content.get_mut(self.selected) {
+                    let queue = self.queue.clone();
+                    let library = self.library.clone();
+                    if let Some(view) = item.open(queue, library) {
                         return Ok(CommandResult::View(view));
                     }
                 }
             }
-        }
+            Command::Goto(mode) => {
+                let mut content = self.content.write().unwrap();
+                if let Some(item) = content.get_mut(self.selected) {
+                    let queue = self.queue.clone();
+                    let library = self.library.clone();
+
+                    match mode {
+                        GotoMode::Album => {
+                            if let Some(album) = item.album(queue.clone()) {
+                                let view =
+                                    AlbumView::new(queue, library, &album).as_boxed_view_ext();
+                                return Ok(CommandResult::View(view));
+                            }
+                        }
+                        GotoMode::Artist => {
+                            if let Some(artist) = item.artist() {
+                                let view =
+                                    ArtistView::new(queue, library, &artist).as_boxed_view_ext();
+                                return Ok(CommandResult::View(view));
+                            }
+                        }
+                    }
+                }
+            }
+            _ => {}
+        };
 
         Ok(CommandResult::Ignored)
     }

src/ui/playlist.rs

@@ -3,6 +3,7 @@ use std::sync::{Arc, RwLock};
 use cursive::view::ViewWrapper;
 use cursive::Cursive;
 
+use command::Command;
 use commands::CommandResult;
 use library::Library;
 use playlist::Playlist;
@@ -43,12 +44,7 @@ impl ViewExt for PlaylistView {
         self.playlist.name.clone()
     }
 
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        self.list.on_command(s, cmd, args)
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        self.list.on_command(s, cmd)
     }
 }

src/ui/playlists.rs

@@ -4,6 +4,7 @@ use cursive::view::ViewWrapper;
 use cursive::views::Dialog;
 use cursive::Cursive;
 
+use command::Command;
 use commands::CommandResult;
 use library::Library;
 use playlist::Playlist;
@@ -52,19 +53,14 @@ impl ViewWrapper for PlaylistsView {
 }
 
 impl ViewExt for PlaylistsView {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        if cmd == "delete" {
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        if let Command::Delete = cmd {
             if let Some(dialog) = self.delete_dialog() {
                 s.add_layer(dialog);
             }
             return Ok(CommandResult::Consumed(None));
         }
 
-        self.list.on_command(s, cmd, args)
+        self.list.on_command(s, cmd)
     }
 }

src/ui/queue.rs

@@ -6,6 +6,7 @@ use cursive::Cursive;
 use std::cmp::min;
 use std::sync::Arc;
 
+use command::{Command, ShiftMode};
 use commands::CommandResult;
 use library::Library;
 use queue::Queue;
@@ -88,55 +89,52 @@ impl ViewWrapper for QueueView {
 }
 
 impl ViewExt for QueueView {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        if cmd == "play" {
-            self.queue.play(self.list.get_selected_index(), true);
-            return Ok(CommandResult::Consumed(None));
-        }
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        match cmd {
+            Command::Play => {
+                self.queue.play(self.list.get_selected_index(), true);
+                return Ok(CommandResult::Consumed(None));
+            }
+            Command::Queue => {
+                return Ok(CommandResult::Ignored);
+            }
+            Command::Delete => {
+                self.queue.remove(self.list.get_selected_index());
+                return Ok(CommandResult::Consumed(None));
+            }
+            Command::Shift(mode, amount) => {
+                let amount = match amount {
+                    Some(amount) => *amount,
+                    _ => 1,
+                };
 
-        if cmd == "queue" {
-            return Ok(CommandResult::Ignored);
-        }
-
-        if cmd == "delete" {
-            self.queue.remove(self.list.get_selected_index());
-            return Ok(CommandResult::Consumed(None));
-        }
-
-        if cmd == "shift" {
-            if let Some(dir) = args.get(0) {
-                let amount: usize = args
-                    .get(1)
-                    .unwrap_or(&"1".to_string())
-                    .parse()
-                    .map_err(|e| format!("{:?}", e))?;
                 let selected = self.list.get_selected_index();
                 let len = self.queue.len();
-                if dir == "up" && selected > 0 {
-                    self.queue.shift(selected, selected.saturating_sub(amount));
-                    self.list.move_focus(-(amount as i32));
-                    return Ok(CommandResult::Consumed(None));
-                } else if dir == "down" && selected < len.saturating_sub(1) {
-                    self.queue
-                        .shift(selected, min(selected + amount as usize, len - 1));
-                    self.list.move_focus(amount as i32);
-                    return Ok(CommandResult::Consumed(None));
+
+                match mode {
+                    ShiftMode::Up if selected > 0 => {
+                        self.queue
+                            .shift(selected, (selected as i32).saturating_sub(amount) as usize);
+                        self.list.move_focus(-(amount as i32));
+                        return Ok(CommandResult::Consumed(None));
+                    }
+                    ShiftMode::Down if selected < len.saturating_sub(1) => {
+                        self.queue
+                            .shift(selected, min(selected + amount as usize, len - 1));
+                        self.list.move_focus(amount as i32);
+                        return Ok(CommandResult::Consumed(None));
+                    }
+                    _ => {}
                 }
             }
+            Command::SaveQueue => {
+                let dialog = Self::save_dialog(self.queue.clone(), self.library.clone());
+                s.add_layer(dialog);
+                return Ok(CommandResult::Consumed(None));
+            }
+            _ => {}
         }
 
-        if cmd == "save" && args.get(0).unwrap_or(&"".to_string()) == "queue" {
-            let dialog = Self::save_dialog(self.queue.clone(), self.library.clone());
-            s.add_layer(dialog);
-            return Ok(CommandResult::Consumed(None));
-        }
-
-        self.with_view_mut(move |v| v.on_command(s, cmd, args))
-            .unwrap()
+        self.with_view_mut(move |v| v.on_command(s, cmd)).unwrap()
     }
 }

src/ui/search.rs

@@ -11,6 +11,7 @@ use std::sync::{Arc, Mutex, RwLock};
 
 use album::Album;
 use artist::Artist;
+use command::{Command, MoveMode};
 use commands::CommandResult;
 use events::EventManager;
 use library::Library;
@@ -411,6 +412,14 @@ impl View for SearchView {
         self.tabs.layout(Vec2::new(size.x, size.y - 1));
     }
 
+    fn on_event(&mut self, event: Event) -> EventResult {
+        if self.edit_focused {
+            self.edit.on_event(event)
+        } else {
+            self.tabs.on_event(event)
+        }
+    }
+
     fn call_on_any<'a>(&mut self, selector: &Selector<'_>, mut callback: AnyCb<'a>) {
         self.edit.call_on_any(selector, Box::new(|v| callback(v)));
         self.tabs.call_on_any(selector, Box::new(|v| callback(v)));
@@ -424,52 +433,38 @@ impl View for SearchView {
             Err(())
         }
     }
-
-    fn on_event(&mut self, event: Event) -> EventResult {
-        if self.edit_focused {
-            self.edit.on_event(event)
-        } else {
-            self.tabs.on_event(event)
-        }
-    }
 }
 
 impl ViewExt for SearchView {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        if cmd == "search" && !args.is_empty() {
-            self.run_search(args.join(" "));
-            return Ok(CommandResult::Consumed(None));
-        }
-
-        if cmd == "focus" {
-            self.edit_focused = true;
-            self.clear();
-            return Ok(CommandResult::Consumed(None));
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        match cmd {
+            Command::Search(query) => self.run_search(query.to_string()),
+            Command::Focus(_) => {
+                self.edit_focused = true;
+                self.clear();
+                return Ok(CommandResult::Consumed(None));
+            }
+            _ => {}
         }
 
         let result = if !self.edit_focused {
-            self.tabs.on_command(s, cmd, args)?
+            self.tabs.on_command(s, cmd)?
         } else {
             CommandResult::Ignored
         };
 
         if let CommandResult::Ignored = result {
-            if cmd == "move" {
-                if let Some(dir) = args.get(0) {
-                    if dir == "up" && !self.edit_focused {
+            if let Command::Move(mode, _) = cmd {
+                match mode {
+                    MoveMode::Up if !self.edit_focused => {
                         self.edit_focused = true;
                         return Ok(CommandResult::Consumed(None));
                     }
-
-                    if dir == "down" && self.edit_focused {
+                    MoveMode::Down if self.edit_focused => {
                         self.edit_focused = false;
                         return Ok(CommandResult::Consumed(None));
                     }
+                    _ => {}
                 }
             }
         }

src/ui/tabview.rs

@@ -7,6 +7,7 @@ use cursive::traits::View;
 use cursive::{Cursive, Printer, Vec2};
 use unicode_width::UnicodeWidthStr;
 
+use command::{Command, MoveMode};
 use commands::CommandResult;
 use traits::{IntoBoxedViewExt, ViewExt};
 
@@ -102,36 +103,30 @@ impl View for TabView {
 }
 
 impl ViewExt for TabView {
-    fn on_command(
-        &mut self,
-        s: &mut Cursive,
-        cmd: &str,
-        args: &[String],
-    ) -> Result<CommandResult, String> {
-        if cmd == "move" {
-            if let Some(dir) = args.get(0) {
-                let amount: i32 = args
-                    .get(1)
-                    .unwrap_or(&"1".to_string())
-                    .parse()
-                    .map_err(|e| format!("{:?}", e))?;
+    fn on_command(&mut self, s: &mut Cursive, cmd: &Command) -> Result<CommandResult, String> {
+        if let Command::Move(mode, amount) = cmd {
+            let amount = match amount {
+                Some(amount) => *amount,
+                _ => 1,
+            };
 
-                let len = self.tabs.len();
+            let len = self.tabs.len();
 
-                if dir == "left" && self.selected > 0 {
-                    self.move_focus(-amount);
+            match mode {
+                MoveMode::Left if self.selected > 0 => {
+                    self.move_focus(-(amount as i32));
                     return Ok(CommandResult::Consumed(None));
                 }
-
-                if dir == "right" && self.selected < len - 1 {
-                    self.move_focus(amount);
+                MoveMode::Right if self.selected < len - 1 => {
+                    self.move_focus(amount as i32);
                     return Ok(CommandResult::Consumed(None));
                 }
+                _ => {}
             }
         }
 
         if let Some(tab) = self.tabs.get_mut(self.selected) {
-            tab.view.on_command(s, cmd, args)
+            tab.view.on_command(s, cmd)
         } else {
             Ok(CommandResult::Ignored)
         }