Add presence module

Cargo.toml

@@ -12,6 +12,7 @@ edition = "2018"
 
 [dependencies]
 matches = "0.1.8"
-ruma-serde = "0.2.1"
+ruma-serde = "0.2.2"
-serde = { version = "1.0.110", features = ["derive"] }
+serde = { version = "1.0.111", features = ["derive"] }
 serde_json = { version = "1.0.53", features = ["raw_value"] }
+strum = { version = "0.18.0", features = ["derive"] }

src/lib.rs

@@ -2,4 +2,5 @@
 
 #![warn(missing_docs)]
 
+pub mod presence;
 pub mod push;

src/presence.rs

@@ -0,0 +1,23 @@
+use serde::{Deserialize, Serialize};
+use strum::{Display, EnumString};
+
+/// A description of a user's connectivity and availability for chat.
+#[derive(Clone, Copy, Debug, PartialEq, Display, EnumString, Deserialize, Serialize)]
+#[serde(rename_all = "snake_case")]
+#[strum(serialize_all = "snake_case")]
+pub enum PresenceState {
+    /// Disconnected from the service.
+    Offline,
+
+    /// Connected to the service.
+    Online,
+
+    /// Connected to the service but not available for chat.
+    Unavailable,
+}
+
+impl Default for PresenceState {
+    fn default() -> Self {
+        Self::Online
+    }
+}