feat(core): incrementally load items

src/core/models.zig

@@ -1,7 +1,3 @@
-const std = @import("std");
-const Provider = @import("provider/provider.zig").Provider;
-const consts = @import("consts.zig");
-
 pub const Item = struct {
     allocator: std.mem.Allocator,
     provider: Provider,
@@ -52,13 +48,13 @@ pub const Element = struct {
 pub const Container = struct {
     item: Item,
 
-    children: std.ArrayList(FullName),
+    children: locked(std.ArrayList(FullName)),
     childrenLoading: bool,
     fn deinit(self: *Container) void {
-        for (self.children.items) |itemFullName| {
+        for (self.children.data.items) |itemFullName| {
             self.item.allocator.free(itemFullName.path);
         }
-        self.children.deinit();
+        self.children.data.deinit();
         self.item.allocator.destroy(self);
     }
 };
@@ -103,3 +99,8 @@ pub const AbsolutePathType = union(enum) {
     container,
     item,
 };
+
+const std = @import("std");
+const Provider = @import("provider/provider.zig").Provider;
+const consts = @import("consts.zig");
+const locked = @import("./sync.zig").locked;

src/core/provider/local.zig

@@ -18,7 +18,9 @@ fn loadChildren(container: *Container) void {
     while (it.next() catch return) |entry| {
         const child = container.item.fullName.getChild(entry.name, container.item.allocator) catch return;
 
-        container.children.append(child) catch return;
+        container.children.mutex.lock();
+        defer container.children.mutex.unlock();
+        container.children.data.append(child) catch return;
     }
 }
 
@@ -108,7 +110,9 @@ pub const LocalContentProvider = struct {
             .directory => blk: {
                 const container = try allocator.create(Container);
                 container.* = Container{
-                    .children = std.ArrayList(FullName).init(allocator),
+                    .children = locked(std.ArrayList(FullName)){
+                        .data = std.ArrayList(FullName).init(allocator),
+                    },
                     .childrenLoading = true,
                     .item = undefined,
                 };
@@ -214,3 +218,4 @@ const ItemEnum = models.ItemEnum;
 const Element = models.Element;
 const Container = models.Container;
 const native_os = @import("builtin").os.tag;
+const locked = @import("../sync.zig").locked;

src/core/tab/tab.zig

@@ -2,6 +2,7 @@ pub const Tab = struct {
     allocator: std.mem.Allocator,
     currentLocation: ?*Container,
     currentItems: locked(?std.ArrayList(Arc(*Item))),
+    currentParentItems: locked(?std.ArrayList(Arc(*Item))),
     currentLocationChanged: Observable(?*Container),
     currentItemFullName: ?models.FullName,
     currentItem: ?Arc(*models.Item),
@@ -19,6 +20,7 @@ pub const Tab = struct {
         self.* = Tab{
             .allocator = allocator,
             .currentItems = .{ .data = null },
+            .currentParentItems = .{ .data = null },
             .currentLocationChanged = Observable(?*Container).init(allocator),
             .currentLocation = null,
             .currentRequested = null,
@@ -198,11 +200,21 @@ pub const Tab = struct {
         }
 
         //TODO: add async
-        while (location.childrenLoading) {
-            std.Thread.sleep(1 * std.time.ns_per_ms);
-        }
+        //NOTE: also we should
+        var processed_number: usize = 0;
+        while (true) {
+            std.Thread.sleep(100 * std.time.ns_per_ms);
 
-        for (location.children.items) |item_fullname| {
+            location.children.mutex.lock();
+            defer location.children.mutex.unlock();
+
+            std.debug.assert(processed_number <= location.children.data.items.len);
+
+            if (!location.childrenLoading and processed_number == location.children.data.items.len) break;
+            if (processed_number == location.children.data.items.len) continue;
+
+            defer processed_number = location.children.data.items.len;
+            for (location.children.data.items[processed_number..]) |item_fullname| {
                 const resolvedItem = location.item.provider.getItemByFullName(item_fullname, &.{ .skipChildInit = true }, self.allocator) catch |e| {
                     //TODO: save error to container errors
                     std.debug.print("error {} {s}\r\n", .{ e, item_fullname.path });
@@ -226,6 +238,7 @@ pub const Tab = struct {
                 self.updateCurrentItem() catch {};
             }
         }
+    }
 
     pub fn deinit(self: *Tab) void {
         if (self.currentLocation) |c| {