feat(core): appstate

src/core/action/action.zig

@@ -0,0 +1,4 @@
+pub const Action = union(enum) {
+    GoUp,
+    Enter,
+};

src/core/action/action_handler.zig

@@ -0,0 +1,17 @@
+pub fn handle(action: Action, appState: *AppState) !void {
+    switch (action) {
+        .GoUp => {
+            if (appState.currentTab.currentLocation) |currentLocation| {
+                const parent = currentLocation.item.parent;
+                if (parent) |p| {
+                    try appState.currentTab.setCurrentLocation(.{ .path = p.path.path });
+                } else return error.NoParent;
+            } else return error.NoCurrentLocation;
+        },
+        .Enter => unreachable,
+    }
+}
+
+const Action = @import("action.zig").Action;
+const AppState = @import("../app_state.zig").AppState;
+const RootProvider = @import("../provider/root.zig").RootProvider;