feat: new cairo module

Resolves #105

Co-authored-by: A-Cloud-Ninja <5809177+A-Cloud-Ninja@users.noreply.github.com>

src/clients/lua.rs

@@ -0,0 +1,41 @@
+use mlua::Lua;
+use std::ops::Deref;
+use std::path::Path;
+use tracing::{debug, error};
+
+/// Wrapper around Lua instance
+/// to create a singleton and handle initialization.
+#[derive(Debug)]
+pub struct LuaEngine {
+    lua: Lua,
+}
+
+impl LuaEngine {
+    pub fn new(config_dir: &Path) -> Self {
+        let lua = unsafe { Lua::unsafe_new() };
+
+        let user_init = config_dir.join("init.lua");
+        if user_init.exists() {
+            debug!("loading user init script");
+
+            if let Err(err) = lua.load(user_init).exec() {
+                error!("{err:?}");
+            }
+        }
+
+        debug!("loading internal init script");
+        if let Err(err) = lua.load(include_str!("../../lua/init.lua")).exec() {
+            error!("{err:?}");
+        }
+
+        Self { lua }
+    }
+}
+
+impl Deref for LuaEngine {
+    type Target = Lua;
+
+    fn deref(&self) -> &Self::Target {
+        &self.lua
+    }
+}

src/clients/mod.rs

@@ -1,11 +1,15 @@
 use crate::{await_sync, Ironbar};
 use color_eyre::Result;
+use std::path::Path;
+use std::rc::Rc;
 use std::sync::Arc;
 
 #[cfg(feature = "clipboard")]
 pub mod clipboard;
 #[cfg(feature = "workspaces")]
 pub mod compositor;
+#[cfg(feature = "cairo")]
+pub mod lua;
 #[cfg(feature = "music")]
 pub mod music;
 #[cfg(feature = "notifications")]
@@ -27,6 +31,8 @@ pub struct Clients {
     workspaces: Option<Arc<dyn compositor::WorkspaceClient>>,
     #[cfg(feature = "clipboard")]
     clipboard: Option<Arc<clipboard::Client>>,
+    #[cfg(feature = "cairo")]
+    lua: Option<Rc<lua::LuaEngine>>,
     #[cfg(feature = "music")]
     music: std::collections::HashMap<music::ClientType, Arc<dyn music::MusicClient>>,
     #[cfg(feature = "notifications")]
@@ -75,6 +81,13 @@ impl Clients {
         Ok(client)
     }
 
+    #[cfg(feature = "cairo")]
+    pub fn lua(&mut self, config_dir: &Path) -> Rc<lua::LuaEngine> {
+        self.lua
+            .get_or_insert_with(|| Rc::new(lua::LuaEngine::new(config_dir)))
+            .clone()
+    }
+
     #[cfg(feature = "music")]
     pub fn music(&mut self, client_type: music::ClientType) -> Arc<dyn music::MusicClient> {
         self.music