clean: add docstrings, move a few things around

src/core_api.rs

@@ -1,3 +1,5 @@
+//! The core API for interacting with [`Mpv`].
+
 use futures::StreamExt;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
@@ -13,6 +15,16 @@ use crate::{
     Error, ErrorCode, Event,
 };
 
+/// All possible commands that can be sent to mpv.
+///
+/// Not all commands are guaranteed to be implemented.
+/// If something is missing, please open an issue.
+///
+/// You can also use the `run_command_raw` function to run commands
+/// that are not implemented here.
+///
+/// See <https://mpv.io/manual/master/#list-of-input-commands> for
+/// the upstream list of commands.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum MpvCommand {
     LoadFile {
@@ -50,10 +62,12 @@ pub enum MpvCommand {
     Unobserve(isize),
 }
 
+/// Helper trait to keep track of the string literals that mpv expects.
 pub(crate) trait IntoRawCommandPart {
     fn into_raw_command_part(self) -> String;
 }
 
+/// Generic data type representing all possible data types that mpv can return.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum MpvDataType {
     Array(Vec<MpvDataType>),
@@ -66,6 +80,20 @@ pub enum MpvDataType {
     Usize(usize),
 }
 
+/// A mpv playlist.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Playlist(pub Vec<PlaylistEntry>);
+
+/// A single entry in the mpv playlist.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct PlaylistEntry {
+    pub id: usize,
+    pub filename: String,
+    pub title: String,
+    pub current: bool,
+}
+
+/// Options for [`MpvCommand::LoadFile`] and [`MpvCommand::LoadList`].
 #[derive(Debug, Clone, Copy, Serialize, Deserialize)]
 pub enum PlaylistAddOptions {
     Replace,
@@ -81,12 +109,7 @@ impl IntoRawCommandPart for PlaylistAddOptions {
     }
 }
 
-#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+/// Options for [`MpvCommand::Seek`].
-pub enum PlaylistAddTypeOptions {
-    File,
-    Playlist,
-}
-
 #[derive(Debug, Clone, Copy, Serialize, Deserialize)]
 pub enum SeekOptions {
     Relative,
@@ -106,17 +129,7 @@ impl IntoRawCommandPart for SeekOptions {
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+/// A trait for specifying how to extract and parse a value returned through [`Mpv::get_property`].
-pub struct PlaylistEntry {
-    pub id: usize,
-    pub filename: String,
-    pub title: String,
-    pub current: bool,
-}
-
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
-pub struct Playlist(pub Vec<PlaylistEntry>);
-
 pub trait GetPropertyTypeHandler: Sized {
     // TODO: fix this
     #[allow(async_fn_in_trait)]
@@ -135,6 +148,7 @@ where
     }
 }
 
+/// A trait for specifying how to serialize and set a value through [`Mpv::set_property`].
 pub trait SetPropertyTypeHandler<T> {
     // TODO: fix this
     #[allow(async_fn_in_trait)]
@@ -169,6 +183,14 @@ where
     }
 }
 
+/// The main struct for interacting with mpv.
+///
+/// This struct provides the core API for interacting with mpv.
+/// These functions are the building blocks for the higher-level API provided by the `MpvExt` trait.
+/// They can also be used directly to interact with mpv in a more flexible way, mostly returning JSON values.
+///
+/// The `Mpv` struct can be cloned freely, and shared anywhere.
+/// It only contains a message passing channel to the tokio task that handles the IPC communication with mpv.
 #[derive(Clone)]
 pub struct Mpv {
     command_sender: mpsc::Sender<(MpvIpcCommand, oneshot::Sender<MpvIpcResponse>)>,
@@ -226,7 +248,7 @@ impl Mpv {
     pub async fn get_event_stream(&self) -> impl futures::Stream<Item = Result<Event, Error>> {
         tokio_stream::wrappers::BroadcastStream::new(self.broadcast_channel.subscribe()).map(
             |event| match event {
-                Ok(event) => crate::event_parser::map_event(event),
+                Ok(event) => crate::event_parser::parse_event(event),
                 Err(_) => Err(Error(ErrorCode::ConnectError(
                     "Failed to receive event".to_string(),
                 ))),
@@ -281,7 +303,7 @@ impl Mpv {
     /// ## Input arguments
     ///
     /// - **command**   defines the mpv command that should be executed
-    /// - **args**      a slice of &str's which define the arguments
+    /// - **args**      a slice of `&str`'s which define the arguments
     ///
     /// # Example
     /// ```
@@ -405,12 +427,12 @@ impl Mpv {
     /// Retrieves the property value from mpv.
     ///
     /// ## Supported types
-    /// - String
+    /// - `String`
-    /// - bool
+    /// - `bool`
-    /// - HashMap<String, String> (e.g. for the 'metadata' property)
+    /// - `HashMap<String, String>` (e.g. for the 'metadata' property)
-    /// - Vec<PlaylistEntry> (for the 'playlist' property)
+    /// - `Vec<PlaylistEntry>` (for the 'playlist' property)
-    /// - usize
+    /// - `usize`
-    /// - f64
+    /// - `f64`
     ///
     /// ## Input arguments
     ///
@@ -472,18 +494,18 @@ impl Mpv {
 
     /// # Description
     ///
-    /// Sets the mpv property _<property>_ to _<value>_.
+    /// Sets the mpv property _`<property>`_ to _`<value>`_.
     ///
     /// ## Supported types
-    /// - String
+    /// - `String`
-    /// - bool
+    /// - `bool`
-    /// - f64
+    /// - `f64`
-    /// - usize
+    /// - `usize`
     ///
     /// ## Input arguments
     ///
     /// - **property** defines the mpv property that should be retrieved
-    /// - **value** defines the value of the given mpv property _<property>_
+    /// - **value** defines the value of the given mpv property _`<property>`_
     ///
     /// # Example
     /// ```

src/error.rs

@@ -1,8 +1,11 @@
+//! Library specific error messages.
+
 use core::fmt;
 use std::fmt::Display;
 
 use serde::{Deserialize, Serialize};
 
+/// All possible errors that can occur when interacting with mpv.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ErrorCode {
     MpvError(String),
@@ -21,6 +24,7 @@ pub enum ErrorCode {
     ValueDoesNotContainUsize,
 }
 
+/// Any error that can occur when interacting with mpv.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Error(pub ErrorCode);
 

src/event_parser.rs

@@ -1,9 +1,21 @@
+//! JSON parsing logic for events from [`MpvIpc`](crate::ipc::MpvIpc).
+
 use std::collections::HashMap;
 
 use serde::{Deserialize, Serialize};
+use serde_json::{Map, Value};
 
 use crate::{ipc::MpvIpcEvent, Error, ErrorCode, MpvDataType};
 
+/// All possible properties that can be observed through the event system.
+///
+/// Not all properties are guaranteed to be implemented.
+/// If something is missing, please open an issue.
+///
+/// Otherwise, the property will be returned as a `Property::Unknown` variant.
+///
+/// See <https://mpv.io/manual/master/#properties> for
+/// the upstream list of properties.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum Property {
     Path(Option<String>),
@@ -14,6 +26,15 @@ pub enum Property {
     Unknown { name: String, data: MpvDataType },
 }
 
+/// All possible events that can be sent by mpv.
+///
+/// Not all event types are guaranteed to be implemented.
+/// If something is missing, please open an issue.
+///
+/// Otherwise, the event will be returned as an `Event::Unimplemented` variant.
+///
+/// See <https://mpv.io/manual/master/#list-of-events> for
+/// the upstream list of events.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum Event {
     Shutdown,
@@ -37,7 +58,8 @@ pub enum Event {
     Unimplemented,
 }
 
-pub(crate) fn map_event(raw_event: MpvIpcEvent) -> Result<Event, Error> {
+/// Parse a highlevel [`Event`] objects from json.
+pub(crate) fn parse_event(raw_event: MpvIpcEvent) -> Result<Event, Error> {
     let MpvIpcEvent(event) = raw_event;
 
     event
@@ -66,59 +88,8 @@ pub(crate) fn map_event(raw_event: MpvIpcEvent) -> Result<Event, Error> {
                 "metadata-update" => Ok(Event::MetadataUpdate),
                 "seek" => Ok(Event::Seek),
                 "playback-restart" => Ok(Event::PlaybackRestart),
-                "property-change" => {
+                "property-change" => parse_event_property(event)
-                    let id = event
+                    .and_then(|(id, property)| Ok(Event::PropertyChange { id, property })),
-                        .get("id")
-                        .ok_or(Error(ErrorCode::MissingValue))?
-                        .as_u64()
-                        .ok_or(Error(ErrorCode::ValueDoesNotContainUsize))?
-                        as usize;
-                    let property_name = event
-                        .get("name")
-                        .ok_or(Error(ErrorCode::MissingValue))?
-                        .as_str()
-                        .ok_or(Error(ErrorCode::ValueDoesNotContainString))?;
-
-                    match property_name {
-                        "path" => {
-                            let path = event
-                                .get("data")
-                                .ok_or(Error(ErrorCode::MissingValue))?
-                                .as_str()
-                                .map(|s| s.to_string());
-                            Ok(Event::PropertyChange {
-                                id,
-                                property: Property::Path(path),
-                            })
-                        }
-                        "pause" => {
-                            let pause = event
-                                .get("data")
-                                .ok_or(Error(ErrorCode::MissingValue))?
-                                .as_bool()
-                                .ok_or(Error(ErrorCode::ValueDoesNotContainBool))?;
-                            Ok(Event::PropertyChange {
-                                id,
-                                property: Property::Pause(pause),
-                            })
-                        }
-                        // TODO: missing cases
-                        _ => {
-                            let data = event
-                                .get("data")
-                                .ok_or(Error(ErrorCode::MissingValue))?
-                                .clone();
-                            Ok(Event::PropertyChange {
-                                id,
-                                property: Property::Unknown {
-                                    name: property_name.to_string(),
-                                    // TODO: fix
-                                    data: MpvDataType::Double(data.as_f64().unwrap_or(0.0)),
-                                },
-                            })
-                        }
-                    }
-                }
                 "chapter-change" => Ok(Event::ChapterChange),
                 "client-message" => {
                     let args = event
@@ -139,3 +110,51 @@ pub(crate) fn map_event(raw_event: MpvIpcEvent) -> Result<Event, Error> {
             }
         })
 }
+
+/// Parse a highlevel [`Property`] object from json, used for [`Event::PropertyChange`].
+fn parse_event_property(event: &Map<String, Value>) -> Result<(usize, Property), Error> {
+    let id = event
+        .get("id")
+        .ok_or(Error(ErrorCode::MissingValue))?
+        .as_u64()
+        .ok_or(Error(ErrorCode::ValueDoesNotContainUsize))? as usize;
+    let property_name = event
+        .get("name")
+        .ok_or(Error(ErrorCode::MissingValue))?
+        .as_str()
+        .ok_or(Error(ErrorCode::ValueDoesNotContainString))?;
+
+    match property_name {
+        "path" => {
+            let path = event
+                .get("data")
+                .ok_or(Error(ErrorCode::MissingValue))?
+                .as_str()
+                .map(|s| s.to_string());
+            Ok((id, Property::Path(path)))
+        }
+        "pause" => {
+            let pause = event
+                .get("data")
+                .ok_or(Error(ErrorCode::MissingValue))?
+                .as_bool()
+                .ok_or(Error(ErrorCode::ValueDoesNotContainBool))?;
+            Ok((id, Property::Pause(pause)))
+        }
+        // TODO: missing cases
+        _ => {
+            let data = event
+                .get("data")
+                .ok_or(Error(ErrorCode::MissingValue))?
+                .clone();
+            Ok((
+                id,
+                Property::Unknown {
+                    name: property_name.to_string(),
+                    // TODO: fix
+                    data: MpvDataType::Double(data.as_f64().unwrap_or(0.0)),
+                },
+            ))
+        }
+    }
+}

src/highlevel_api_extension.rs

@@ -1,10 +1,13 @@
+//! High-level API extension for [`Mpv`].
+
 use crate::{
     Error, IntoRawCommandPart, Mpv, MpvCommand, MpvDataType, Playlist, PlaylistAddOptions,
-    PlaylistAddTypeOptions, PlaylistEntry, SeekOptions,
+    PlaylistEntry, SeekOptions,
 };
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
+/// Generic high-level command for changing a number property.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum NumberChangeOptions {
     Absolute,
@@ -22,6 +25,7 @@ impl IntoRawCommandPart for NumberChangeOptions {
     }
 }
 
+/// Generic high-level switch for toggling boolean properties.
 #[derive(Debug, Clone, Copy, Serialize, Deserialize)]
 pub enum Switch {
     On,
@@ -29,7 +33,14 @@ pub enum Switch {
     Toggle,
 }
 
-/// The `MpvExt` trait provides a set of typesafe high-level functions to interact with mpv.
+/// Options for [`MpvExt::playlist_add`].
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum PlaylistAddTypeOptions {
+    File,
+    Playlist,
+}
+
+/// A set of typesafe high-level functions to interact with [`Mpv`].
 // TODO: fix this
 #[allow(async_fn_in_trait)]
 pub trait MpvExt {

src/ipc.rs

@@ -1,19 +1,28 @@
-use super::*;
+//! IPC handling thread/task. Handles communication between [`Mpv`](crate::Mpv) instances and mpv's unix socket
+
 use futures::{SinkExt, StreamExt};
 use serde_json::{json, Value};
 use std::mem;
-use tokio::net::UnixStream;
+use tokio::{
-use tokio::sync::mpsc;
+    net::UnixStream,
-use tokio::sync::{broadcast, oneshot, Mutex};
+    sync::{broadcast, mpsc, oneshot, Mutex},
+};
 use tokio_util::codec::{Framed, LinesCodec, LinesCodecError};
 
+use crate::{Error, ErrorCode};
+
+/// Container for all state that regards communication with the mpv IPC socket
+/// and message passing with [`Mpv`](crate::Mpv) controllers.
 pub(crate) struct MpvIpc {
     socket: Framed<UnixStream, LinesCodec>,
-    command_channel: mpsc::Receiver<(MpvIpcCommand, oneshot::Sender<MpvIpcResponse>)>,
+    // I had trouble with reading and writing to the socket when it was wrapped
+    // in a MutexGuard, so I'm using a separate Mutex to lock the socket when needed.
     socket_lock: Mutex<()>,
+    command_channel: mpsc::Receiver<(MpvIpcCommand, oneshot::Sender<MpvIpcResponse>)>,
     event_channel: broadcast::Sender<MpvIpcEvent>,
 }
 
+/// Commands that can be sent to [`MpvIpc`]
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub(crate) enum MpvIpcCommand {
     Command(Vec<String>),
@@ -24,9 +33,11 @@ pub(crate) enum MpvIpcCommand {
     Exit,
 }
 
+/// [`MpvIpc`]'s response to a [`MpvIpcCommand`].
 #[derive(Debug, Clone)]
 pub(crate) struct MpvIpcResponse(pub(crate) Result<Option<Value>, Error>);
 
+/// A deserialized and partially parsed event from mpv.
 #[derive(Debug, Clone)]
 pub(crate) struct MpvIpcEvent(pub(crate) Value);
 
@@ -88,10 +99,6 @@ impl MpvIpc {
         property: &str,
         value: Value,
     ) -> Result<Option<Value>, Error> {
-        // let str_value = match &value {
-        //     Value::String(s) => s,
-        //     v => &serde_json::to_string(&v).unwrap(),
-        // };
         self.send_command(&[json!("set_property"), json!(property), value])
             .await
     }
@@ -177,6 +184,9 @@ impl MpvIpc {
     }
 }
 
+/// This function does the most basic JSON parsing and error handling
+/// for status codes and errors that all responses from mpv are
+/// expected to contain.
 fn parse_mpv_response_data(value: Value) -> Result<Option<Value>, Error> {
     log::trace!("Parsing mpv response data: {:?}", value);
     let result = value

src/lib.rs

@@ -1,11 +1,13 @@
-mod highlevel_api_extension;
+#![doc = include_str!("../README.md")]
+
 mod core_api;
 mod error;
 mod event_parser;
+mod highlevel_api_extension;
 mod ipc;
 mod message_parser;
 
-pub use highlevel_api_extension::*;
 pub use core_api::*;
 pub use error::*;
 pub use event_parser::*;
+pub use highlevel_api_extension::*;

src/message_parser.rs

@@ -1,3 +1,5 @@
+//! JSON parsing logic for command responses from [`MpvIpc`](crate::ipc::MpvIpc).
+
 use std::collections::HashMap;
 
 use serde_json::Value;