move all state to single field on server struct (#144)

crates/djls-server/src/session.rs

@@ -0,0 +1,55 @@
+use crate::documents::Store;
+use djls_conf::Settings;
+use djls_project::DjangoProject;
+use tower_lsp_server::lsp_types::ClientCapabilities;
+
+#[derive(Debug, Default)]
+pub struct Session {
+    client_capabilities: Option<ClientCapabilities>,
+    project: Option<DjangoProject>,
+    documents: Store,
+    settings: Settings,
+}
+
+impl Session {
+    pub fn new(client_capabilities: ClientCapabilities) -> Self {
+        Self {
+            client_capabilities: Some(client_capabilities),
+            project: None,
+            documents: Store::new(),
+            settings: Settings::default(),
+        }
+    }
+
+    pub fn client_capabilities(&self) -> &Option<ClientCapabilities> {
+        &self.client_capabilities
+    }
+
+    pub fn client_capabilities_mut(&mut self) -> &mut Option<ClientCapabilities> {
+        &mut self.client_capabilities
+    }
+
+    pub fn project(&self) -> Option<&DjangoProject> {
+        self.project.as_ref()
+    }
+
+    pub fn project_mut(&mut self) -> &mut Option<DjangoProject> {
+        &mut self.project
+    }
+
+    pub fn documents(&self) -> &Store {
+        &self.documents
+    }
+
+    pub fn documents_mut(&mut self) -> &mut Store {
+        &mut self.documents
+    }
+
+    pub fn settings(&self) -> &Settings {
+        &self.settings
+    }
+
+    pub fn settings_mut(&mut self) -> &mut Settings {
+        &mut self.settings
+    }
+}