feat: add focus attribute in layout (#958)

* feat(layout): add focus attribute in layout

* feat: add state of focus to tab

* chore: i love clippy

* test(layout): update focus options

* feat: add focus pane

* feat: apply focus-pane when layout is only loaded

* change the instruction name for focus-on-tab

* chore: apply cargo-fmt

* test: add e2e testcase

1 files changed, 17 insertions, 1 deletions

diff --git a/zellij-server/src/lib.rs b/zellij-server/src/lib.rs
index 96b7e7fa0..3f7ac9898 100644
--- a/zellij-server/src/lib.rs
+++ b/zellij-server/src/lib.rs
@@ -313,9 +313,25 @@ pub fn start_server(mut os_input: Box<dyn ServerOsApi>, socket_path: PathBuf) {
                 };
 
                 if !&layout.tabs.is_empty() {
-                    for tab_layout in layout.tabs {
+                    for tab_layout in layout.clone().tabs {
                         spawn_tabs(Some(tab_layout.clone()));
                     }
+
+                    let focused_tab = layout
+                        .tabs
+                        .into_iter()
+                        .enumerate()
+                        .find(|(_, tab_layout)| tab_layout.focus.unwrap_or(false));
+                    if let Some((tab_index, _)) = focused_tab {
+                        session_data
+                            .read()
+                            .unwrap()
+                            .as_ref()
+                            .unwrap()
+                            .senders
+                            .send_to_pty(PtyInstruction::GoToTab((tab_index + 1) as u32, client_id))
+                            .unwrap();
+                    }
                 } else {
                     spawn_tabs(None);
                 }