Show UI errors in info line again

Signed-off-by: AnErrupTion <anerruption@disroot.org>

ly-core/src/SharedError.zig

@@ -10,11 +10,20 @@ const ErrorHandler = packed struct {
 const SharedError = @This();
 
 data: []align(std.heap.page_size_min) u8,
+write_error_event_fn: ?*const fn (anyerror, *anyopaque) anyerror!void,
+ctx: ?*anyopaque,
 
-pub fn init() !SharedError {
+pub fn init(
+    write_error_event_fn: ?*const fn (anyerror, *anyopaque) anyerror!void,
+    ctx: ?*anyopaque,
+) !SharedError {
     const data = try std.posix.mmap(null, @sizeOf(ErrorHandler), std.posix.PROT.READ | std.posix.PROT.WRITE, .{ .TYPE = .SHARED, .ANONYMOUS = true }, -1, 0);
 
-    return .{ .data = data };
+    return .{
+        .data = data,
+        .write_error_event_fn = write_error_event_fn,
+        .ctx = ctx,
+    };
 }
 
 pub fn deinit(self: *SharedError) void {
@@ -25,6 +34,10 @@ pub fn writeError(self: SharedError, err: anyerror) void {
     var buf_stream = std.io.fixedBufferStream(self.data);
     const writer = buf_stream.writer();
     writer.writeStruct(ErrorHandler{ .has_error = true, .err_int = @intFromError(err) }) catch {};
+
+    if (self.write_error_event_fn) |write_error_event_fn| {
+        @call(.auto, write_error_event_fn, .{ err, self.ctx.? }) catch {};
+    }
 }
 
 pub fn readError(self: SharedError) ?anyerror {

src/auth.zig

@@ -105,7 +105,7 @@ pub fn authenticate(allocator: std.mem.Allocator, log_file: *LogFile, options: A
     try log_file.info("auth/passwd", "setting user shell", .{});
     if (user_entry.shell == null) interop.setUserShell(&user_entry);
 
-    var shared_err = try SharedError.init();
+    var shared_err = try SharedError.init(null, null);
     defer shared_err.deinit();
 
     log_file.deinit();

src/main.zig

@@ -1054,6 +1054,7 @@ pub fn main() !void {
 
     try state.buffer.registerKeybind("Ctrl+C", &quit, &state);
 
+    // TODO: Make this generic for any Text widget present in the UI
     try state.buffer.registerKeybind("Ctrl+U", &clearPassword, &state);
 
     try state.buffer.registerKeybind("K", &viMoveCursorUp, &state);
@@ -1093,7 +1094,6 @@ pub fn main() !void {
         );
     }
 
-    // Position components and place cursor accordingly
     if (state.is_autologin) _ = try authenticate(&state);
 
     const active_widget = switch (default_input) {
@@ -1103,7 +1103,7 @@ pub fn main() !void {
         .password => state.password_widget,
     };
 
-    var shared_error = try SharedError.init();
+    var shared_error = try SharedError.init(&uiErrorHandler, &state);
     defer shared_error.deinit();
 
     try state.buffer.runEventLoop(
@@ -1119,6 +1119,35 @@ pub fn main() !void {
     );
 }
 
+fn uiErrorHandler(err: anyerror, ctx: *anyopaque) anyerror!void {
+    var state: *UiState = @ptrCast(@alignCast(ctx));
+
+    switch (err) {
+        error.SetCursorFailed => {
+            try state.info_line.addMessage(
+                state.lang.err_alloc,
+                state.config.error_bg,
+                state.config.error_fg,
+            );
+        },
+        error.WidgetReallocationFailed => {
+            try state.info_line.addMessage(
+                state.lang.err_alloc,
+                state.config.error_bg,
+                state.config.error_fg,
+            );
+        },
+        error.CurrentWidgetHandlingFailed => {
+            try state.info_line.addMessage(
+                state.lang.err_alloc,
+                state.config.error_bg,
+                state.config.error_fg,
+            );
+        },
+        else => unreachable,
+    }
+}
+
 fn disableInsertMode(ptr: *anyopaque) !bool {
     var state: *UiState = @ptrCast(@alignCast(ptr));
 
@@ -1256,7 +1285,7 @@ fn authenticate(ptr: *anyopaque) !bool {
         }
     }
 
-    var shared_err = try SharedError.init();
+    var shared_err = try SharedError.init(null, null);
     defer shared_err.deinit();
 
     {