Use log, env_logger crates to log warnings instead of using eprintln!() macro

Cargo.lock

@@ -467,7 +467,9 @@ dependencies = [
 name = "graphui-rs"
 version = "0.0.1"
 dependencies = [
+ "env_logger",
  "gtk4",
+ "log",
  "pipewire",
 ]
 

Cargo.toml

@@ -9,3 +9,6 @@ edition = "2018"
 [dependencies]
 pipewire = { git = "https://gitlab.freedesktop.org/gdesmott/pipewire-rs", branch = "proxies"}
 gtk = { git = "https://github.com/gtk-rs/gtk4-rs/", package = "gtk4" }
+
+log = "0.4.11"
+env_logger = "0.8.2"

src/main.rs

@@ -15,7 +15,9 @@ pub struct PipewireLink {
 }
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    env_logger::init();
     gtk::init()?;
+
     let graphview = Rc::new(RefCell::new(view::GraphView::new()));
 
     // Create the connection to the pipewire server and do an initial roundtrip before showing the view,

src/pipewire_state.rs

@@ -145,8 +145,7 @@ impl PipewireState {
 
             self.items.remove(&id);
         } else {
-            // FIXME: Switch to log macro
-            eprintln!(
+            log::warn!(
                 "Attempted to remove item with id {} that is not saved in state",
                 id
             );

src/view/graph_view.rs

@@ -124,8 +124,7 @@ mod imp {
                     cr.curve_to(from_x + 75.0, from_y, to_x - 75.0, to_y, to_x, to_y);
                     cr.stroke();
                 } else {
-                    eprintln!("Could not get allocation of ports of link: {:?}", link);
-                    // FIXME: Log an info instead.
+                    log::warn!("Could not get allocation of ports of link: {:?}", link);
                 }
             }
 
@@ -220,9 +219,10 @@ impl GraphView {
             node.add_port(port_id, port);
         } else {
             // FIXME: Log this instead
-            eprintln!(
+            log::error!(
                 "Node with id {} not found when trying to add port with id {} to graph",
-                node_id, port_id
+                node_id,
+                port_id
             );
         }
     }