feat: support for 'ironvar' dynamic variables

src/dynamic_value/dynamic_bool.rs

@@ -0,0 +1,78 @@
+#[cfg(feature = "ipc")]
+use crate::ironvar::get_variable_manager;
+use crate::script::Script;
+use crate::send;
+use cfg_if::cfg_if;
+use glib::Continue;
+use serde::Deserialize;
+use tokio::spawn;
+
+#[derive(Debug, Deserialize, Clone)]
+#[serde(untagged)]
+pub enum DynamicBool {
+    /// Either a script or variable, to be determined.
+    Unknown(String),
+    Script(Script),
+    #[cfg(feature = "ipc")]
+    Variable(Box<str>),
+}
+
+impl DynamicBool {
+    pub fn subscribe<F>(self, f: F)
+    where
+        F: FnMut(bool) -> Continue + 'static,
+    {
+        let value = match self {
+            Self::Unknown(input) => {
+                if input.starts_with('#') {
+                    cfg_if! {
+                        if #[cfg(feature = "ipc")] {
+                            Self::Variable(input.into())
+                        } else {
+                            Self::Unknown(input)
+                        }
+                    }
+                } else {
+                    let script = Script::from(input.as_str());
+                    Self::Script(script)
+                }
+            }
+            _ => self,
+        };
+
+        let (tx, rx) = glib::MainContext::channel(glib::PRIORITY_DEFAULT);
+
+        rx.attach(None, f);
+
+        spawn(async move {
+            match value {
+                DynamicBool::Script(script) => {
+                    script
+                        .run(None, |_, success| {
+                            send!(tx, success);
+                        })
+                        .await;
+                }
+                #[cfg(feature = "ipc")]
+                DynamicBool::Variable(variable) => {
+                    let variable_manager = get_variable_manager();
+
+                    let variable_name = variable[1..].into(); // remove hash
+                    let mut rx = crate::write_lock!(variable_manager).subscribe(variable_name);
+
+                    while let Ok(value) = rx.recv().await {
+                        let has_value = value.map(|s| is_truthy(&s)).unwrap_or_default();
+                        send!(tx, has_value);
+                    }
+                }
+                DynamicBool::Unknown(_) => unreachable!(),
+            }
+        });
+    }
+}
+
+/// Check if a string ironvar is 'truthy'
+#[cfg(feature = "ipc")]
+fn is_truthy(string: &str) -> bool {
+    !(string.is_empty() || string == "0" || string == "false")
+}