feat: provide user feadback on bar misconfiguration

src/tui/status/widget.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const EventHandler = @import("EventHandler");
 const Plane = @import("renderer").Plane;
+const log = @import("log");
 
 const Widget = @import("../Widget.zig");
 
@@ -21,6 +22,17 @@ pub const CreateError = error{ OutOfMemory, Exit };
 pub const CreateFunction = *const fn (allocator: std.mem.Allocator, parent: Plane, event_handler: ?EventHandler) CreateError!Widget;
 
 pub fn create(name: []const u8, allocator: std.mem.Allocator, parent: Plane, event_handler: ?EventHandler) CreateError!?Widget {
-    const create_ = widgets.get(name) orelse return null;
+    const create_ = widgets.get(name) orelse {
+        const logger = log.logger("statusbar");
+        logger.print_err("config", "unknown widget \"{s}\" (see log)", .{name});
+        log_widgets(logger);
+        return null;
+    };
     return try create_(allocator, parent, event_handler);
 }
+
+fn log_widgets(logger: anytype) void {
+    logger.print("available widgets:", .{});
+    for (widgets.keys()) |name|
+        logger.print("    {s}", .{name});
+}