Add find_socket() to Magpie

apps/magpie/src/protocol.rs

@@ -4,7 +4,7 @@
 use std::collections::VecDeque;
 use std::io::{Read, Write};
 use std::marker::PhantomData;
-use std::path::PathBuf;
+use std::path::{PathBuf, Path};
 
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 
@@ -211,6 +211,16 @@ impl<T: Read, I: DeserializeOwned, O> Messenger<T, I, O> {
     }
 }
 
+/// Acquires the path to the Magpie socket.
+///
+/// Currently only joins XDG_RUNTIME_DIR with [MAGPIE_SOCK].
+pub fn find_socket() -> PathBuf {
+    let sock_dir = std::env::var("XDG_RUNTIME_DIR").expect("XDG_RUNTIME_DIR not set");
+    let sock_dir = Path::new(&sock_dir);
+    let sock_path = sock_dir.join(MAGPIE_SOCK);
+    sock_path
+}
+
 #[cfg(feature = "async")]
 mod async_messages {
     use super::*;