working switching of the buffers properly well now

client/src/functions/common.rs

@@ -1,2 +1,5 @@
 // src/functions/common.rs
 
+pub mod buffer;
+
+pub use buffer::*;

client/src/functions/common/buffer.rs

@@ -0,0 +1,26 @@
+// src/functions/common/buffer.rs
+
+use crate::state::app::buffer::BufferState;
+
+/// Switches the active buffer index.
+pub fn switch_buffer(buffer_state: &mut BufferState, next: bool) -> bool {
+    if buffer_state.history.len() <= 1 {
+        return false;
+    }
+
+    let len = buffer_state.history.len();
+    let current_index = buffer_state.active_index;
+    let new_index = if next {
+        (current_index + 1) % len
+    } else {
+        (current_index + len - 1) % len
+    };
+
+    if new_index != current_index {
+        buffer_state.active_index = new_index;
+        true
+    } else {
+        false
+    }
+}
+