Move browser code to core crate

src/browse/mod.rs

@@ -0,0 +1,34 @@
+use crate::message::Message;
+use anyhow::Result;
+use tokio::sync::mpsc;
+
+#[cfg(target_family = "unix")]
+mod browse_unix;
+
+#[cfg(target_family = "unix")]
+use browse_unix::{browse_url_impl, handle_browser_open_impl};
+
+#[inline]
+pub async fn browse_url(url: &String) {
+    browse_url_impl(url).await
+}
+
+#[cfg(not(target_family = "unix"))]
+pub async fn browse_url_impl(url: &String) {
+    print!("Opening a browser is not supported on this platform\n");
+    std::process::exit(1);
+}
+
+#[inline]
+pub async fn handle_browser_open(
+    messages: mpsc::Sender<Message>,
+) -> Result<()> {
+    handle_browser_open_impl(messages).await
+}
+
+#[cfg(not(target_family = "unix"))]
+async fn handle_browser_open_impl(
+    messages: mpsc::Sender<Message>,
+) -> Result<()> {
+    std::future::pending().await
+}