feat(ipc): commands for opening/closing popups

Also includes some refactoring around related GTK helper code

src/global_state.rs

@@ -0,0 +1,43 @@
+use crate::popup::Popup;
+use crate::write_lock;
+use std::collections::HashMap;
+use std::sync::{Arc, RwLock, RwLockWriteGuard};
+
+/// Global application state shared across all bars.
+///
+/// Data that needs to be accessed from anywhere
+/// that is not otherwise accessible should be placed on here.
+#[derive(Debug)]
+pub struct GlobalState {
+    popups: HashMap<Box<str>, Arc<RwLock<Popup>>>,
+}
+
+impl GlobalState {
+    pub(crate) fn new() -> Self {
+        Self {
+            popups: HashMap::new(),
+        }
+    }
+
+    pub fn popups(&self) -> &HashMap<Box<str>, Arc<RwLock<Popup>>> {
+        &self.popups
+    }
+
+    pub fn popups_mut(&mut self) -> &mut HashMap<Box<str>, Arc<RwLock<Popup>>> {
+        &mut self.popups
+    }
+
+    pub fn with_popup_mut<F, T>(&self, monitor_name: &str, f: F) -> Option<T>
+    where
+        F: FnOnce(RwLockWriteGuard<Popup>) -> T,
+    {
+        let popup = self.popups().get(monitor_name);
+
+        if let Some(popup) = popup {
+            let popup = write_lock!(popup);
+            Some(f(popup))
+        } else {
+            None
+        }
+    }
+}