╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭06c501ca..╮ 06c501ca.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (207) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig event.zig lib.zig main.zig main_wasm.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig serve_ssh_protocol.zig test.zig testnet.zig try.zig ╭─────────────────────────────────╮ │ui.zig │ ╰─────────────────────────────────╯ web.zig
1212 1213 pub fn getFocus(self: *FlowBox) *Focus { 1214 return self.focus; 1215 } 1216 1217 pub fn cellRect(self: FlowBox, index: usize) ?layout.IRect { 1218 if (self.last_cols == 0 or index >= self.text_boxes.items.len) return null; 1219 const slot_height = self.options.cell_height + border_rows; 1220 const col = index % self.last_cols; 1221 const row = index / self.last_cols; 1222 return .{ 1223 .x = @intCast(col * self.options.cell_width), 1224 .y = @intCast(row * slot_height), 1225 .size = .{ .width = self.options.cell_width, .height = slot_height }, 1226 }; 1227 } 1228 1229 pub fn indexOfFocusId(self: FlowBox, focus_id: usize) ?usize { 1230 for (self.text_boxes.items, 0..) |tb, i| { 1231 if (tb.box.focus.id == focus_id) return i; 1232 } 1233 return null; 1234 } 1235 1236 pub const Scroll = struct { 1237 scroll: wgt.Scroll(Widget), 1238 1239 pub fn init(allocator: std.mem.Allocator, options: FlowBox.Options, web_native: bool) !Scroll { 1240 var layout_inner = try FlowBox.init(allocator, options); 1241 errdefer layout_inner.deinit(allocator); 1242 var scroll = try wgt.Scroll(Widget).init(allocator, .{ .flow_box = layout_inner }, .{ .direction = .vert, .web_native = web_native }); 1243 errdefer scroll.deinit(allocator); 1244 return .{ .scroll = scroll }; 1245 } 1246 1247 pub fn deinit(self: *Scroll, allocator: std.mem.Allocator) void { 1248 self.scroll.deinit(allocator); 1249 } 1250 1251 pub fn setItems(self: *Scroll, allocator: std.mem.Allocator, items: []const Item) !void { 1252 self.scroll.x = 0; 1253 self.scroll.y = 0; 1254 try self.inner().setItems(allocator, items); 1255 } 1256 1257 pub fn build(self: *Scroll, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1258 try self.scroll.build(allocator, constraint, root_focus); 1259 } 1260 1261 pub fn input(self: *Scroll, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1262 _ = allocator; 1263 const in = self.inner(); 1264 const child_id = in.focus.child_id orelse return; 1265 const current_index = in.indexOfFocusId(child_id) orelse return; 1266 const count = in.text_boxes.items.len; 1267 if (count == 0) return; 1268 const cols = in.last_cols; 1269 const slot_height = in.options.cell_height + FlowBox.border_rows; 1270 1271 var index = current_index; 1272 switch (key) { 1273 .arrow_up => index -|= cols, 1274 .arrow_down => if (index + cols < count) { 1275 index += cols; 1276 }, 1277 .arrow_left => index -|= 1, 1278 .arrow_right => if (index + 1 < count) { 1279 index += 1; 1280 }, 1281 .home => index = 0, 1282 .end => index = count - 1, 1283 .page_up => { 1284 if (self.scroll.grid) |grid| if (slot_height > 0) { 1285 const rows_per_page = grid.size.height / slot_height; 1286 index -|= rows_per_page * cols; 1287 }; 1288 }, 1289 .page_down => { 1290 if (self.scroll.grid) |grid| if (slot_height > 0) { 1291 const rows_per_page = grid.size.height / slot_height; 1292 index = @min(index + rows_per_page * cols, count - 1); 1293 }; 1294 }, 1295 // scroll wheel moves the focused cell by a full row so the 1296 // viewport (via scrollToRect) follows in row-sized steps, 1297 // matching how a scroll wheel feels in a grid view. 1298 .mouse => |mouse| switch (mouse.action) { 1299 .scroll => |dir| switch (dir) { 1300 .up => index -|= cols, 1301 .down => if (index + cols < count) { 1302 index += cols; 1303 }, 1304 }, 1305 else => {}, 1306 }, 1307 else => {}, 1308 } 1309 1310 if (index != current_index) { 1311 try root_focus.setFocus(in.text_boxes.items[index].getFocus().id); 1312 if (in.cellRect(index)) |rect| { 1313 self.scroll.scrollToRect(rect); 1314 } 1315 } 1316 } 1317 1318 pub fn clearGrid(self: *Scroll) void { 1319 self.scroll.clearGrid(); 1320 } 1321 1322 pub fn getGrid(self: Scroll) ?Grid { 1323 return self.scroll.getGrid(); 1324 } 1325 1326 pub fn getFocus(self: *Scroll) *Focus { 1327 return self.scroll.getFocus(); 1328 } 1329 1330 pub fn getSelectedIndex(self: Scroll) ?usize { 1331 const in = self.scroll.child.flow_box; 1332 const child_id = in.focus.child_id orelse return null; 1333 return in.indexOfFocusId(child_id); 1334 } 1335 1336 fn inner(self: *Scroll) *FlowBox { 1337 return &self.scroll.child.flow_box; 1338 } 1339 }; 1340 }; 1341 1342 // an invisible widget that fills the horizontal space granted by its parent. 1343 // used inside Box(horiz) with a min_size so the box reserves space for the 1344 // children that follow, pushing them to the right. 1345 pub const Spacer = struct { 1346 focus: *Focus, 1347 grid: ?Grid, 1348 1349 pub fn init(allocator: std.mem.Allocator) !Spacer { 1350 return .{ 1351 .focus = try Focus.create(allocator, .container), 1352 .grid = null, 1353 }; 1354 } 1355 1356 pub fn deinit(self: *Spacer, allocator: std.mem.Allocator) void { 1357 self.focus.destroy(allocator); 1358 if (self.grid) |*grid| { 1359 grid.deinit(); 1360 self.grid = null; 1361 } 1362 } 1363 1364 pub fn build(self: *Spacer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1365 _ = root_focus; 1366 self.clearGrid(); 1367 const width = constraint.max_size.width orelse return; 1368 if (width == 0) return; 1369 self.grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 1370 } 1371 1372 pub fn input(self: *Spacer, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1373 _ = self; 1374 _ = allocator; 1375 _ = key; 1376 _ = root_focus; 1377 } 1378 1379 pub fn clearGrid(self: *Spacer) void { 1380 if (self.grid) |*grid| { 1381 grid.deinit(); 1382 self.grid = null; 1383 } 1384 } 1385 1386 pub fn getGrid(self: Spacer) ?Grid { 1387 return self.grid; 1388 } 1389 1390 pub fn getFocus(self: *Spacer) *Focus { 1391 return self.focus; 1392 } 1393 }; 1394 1395 // a one-row, non-focusable status bar showing the current page's url 1396 pub const Footer = struct { 1397 focus: *Focus, 1398 grid: ?Grid, 1399 session: *Session, 1400 arena: std.heap.ArenaAllocator, 1401 1402 pub fn init(allocator: std.mem.Allocator, session: *Session) !Footer { 1403 return .{ 1404 .focus = try Focus.create(allocator, .container), 1405 .grid = null, 1406 .session = session, 1407 .arena = std.heap.ArenaAllocator.init(allocator), 1408 }; 1409 } 1410 1411 pub fn deinit(self: *Footer, allocator: std.mem.Allocator) void { 1412 self.focus.destroy(allocator); 1413 if (self.grid) |*grid| grid.deinit(); 1414 self.arena.deinit(); 1415 } 1416 1417 pub fn build(self: *Footer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1418 _ = root_focus; 1419 self.clearGrid(); 1420 const width = constraint.max_size.width orelse return; 1421 if (width == 0) return; 1422 1423 _ = self.arena.reset(.retain_capacity); 1424 const aa = self.arena.allocator(); 1425 const path = self.session.data.current_page.urlAlloc(&self.arena) catch return; 1426 const text = if (self.session.web_port) |port| 1427 std.fmt.allocPrint(aa, "http://localhost:{d}{s}", .{ port, path }) catch return 1428 else 1429 path; 1430 1431 var grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 1432 errdefer grid.deinit(); 1433 var utf8 = (std.unicode.Utf8View.init(text) catch return).iterator(); 1434 var i: usize = 0; 1435 while (utf8.nextCodepointSlice()) |ch| { 1436 if (i == width) break; 1437 grid.cells.items[try grid.cells.at(.{ 0, i })].rune = ch; 1438 i += 1; 1439 } 1440 self.grid = grid; 1441 } 1442 1443 pub fn input(self: *Footer, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1444 _ = self; 1445 _ = allocator; 1446 _ = key; 1447 _ = root_focus; 1448 } 1449 1450 pub fn clearGrid(self: *Footer) void { 1451 if (self.grid) |*grid| { 1452 grid.deinit(); 1453 self.grid = null; 1454 } 1455 } 1456 1457 pub fn getGrid(self: Footer) ?Grid { 1458 return self.grid; 1459 } 1460 1461 pub fn getFocus(self: *Footer) *Focus { 1462 return self.focus; 1463 } 1464 }; 1465 1466 // a single-child wrapper that builds the child at its natural size and 1467 // positions its grid in the middle of the area granted by the parent 1468 pub const Center = struct { 1469 focus: *Focus, 1470 grid: ?Grid, 1471 child: *Widget, 1472 direction: Direction, 1473 1474 pub const Direction = enum { both, horiz, vert }; 1475 1476 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, direction: Direction) !Center { 1477 const child = try allocator.create(Widget); 1478 errdefer allocator.destroy(child); 1479 child.* = child_widget; 1480 return .{ 1481 .focus = try Focus.create(allocator, .container), 1482 .grid = null, 1483 .child = child, 1484 .direction = direction, 1485 }; 1486 } 1487 1488 pub fn deinit(self: *Center, allocator: std.mem.Allocator) void { 1489 self.focus.destroy(allocator); 1490 if (self.grid) |*grid| { 1491 grid.deinit(); 1492 self.grid = null; 1493 } 1494 self.child.deinit(allocator); 1495 allocator.destroy(self.child); 1496 } 1497 1498 pub fn build(self: *Center, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1499 self.clearGrid(); 1500 self.getFocus().clear(); 1501 1502 // build the child without forcing it to fill min_size; it sizes 1503 // itself to its content within the available max. 1504 try self.child.build(allocator, .{ 1505 .min_size = .{ .width = null, .height = null }, 1506 .max_size = constraint.max_size, 1507 }, root_focus); 1508 1509 const child_grid = self.child.getGrid() orelse return; 1510 1511 // prefer max when given; otherwise grow to max(min, child) so that 1512 // when only a min is set (e.g. the wasm path passes viewport rows 1513 // as min_height with no max), we can still vertically center while 1514 // letting taller content extend past the min. 1515 const width = if (constraint.max_size.width) |w| w else if (constraint.min_size.width) |min_w| @max(min_w, child_grid.size.width) else child_grid.size.width; 1516 const height = if (constraint.max_size.height) |h| h else if (constraint.min_size.height) |min_h| @max(min_h, child_grid.size.height) else child_grid.size.height; 1517 if (width == 0 or height == 0) return; 1518 1519 const offset_x: usize = if (self.direction == .horiz or self.direction == .both) 1520 (width -| child_grid.size.width) / 2 1521 else 1522 0; 1523 const offset_y: usize = if (self.direction == .vert or self.direction == .both) 1524 (height -| child_grid.size.height) / 2 1525 else 1526 0; 1527 1528 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 1529 errdefer grid.deinit(); 1530 try grid.drawGrid(child_grid, offset_x, offset_y); 1531 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 1532 self.getFocus().child_id = self.child.getFocus().id; 1533 1534 self.grid = grid; 1535 } 1536 1537 pub fn input(self: *Center, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1538 try self.child.input(allocator, key, root_focus); 1539 } 1540 1541 pub fn clearGrid(self: *Center) void { 1542 if (self.grid) |*grid| { 1543 grid.deinit(); 1544 self.grid = null; 1545 } 1546 self.child.clearGrid(); 1547 } 1548 1549 pub fn getGrid(self: Center) ?Grid { 1550 return self.grid; 1551 } 1552 1553 pub fn getFocus(self: *Center) *Focus { 1554 return self.focus; 1555 } 1556 }; 1557 1558 // renders truecolor ANSI art 1559 pub const AnsiArt = struct { 1560 focus: *Focus, 1561 grid: ?Grid, 1562 content: []const u8, 1563 1564 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 1565 return .{ 1566 .focus = try Focus.create(allocator, .container), 1567 .grid = null, 1568 .content = content, 1569 }; 1570 } 1571 1572 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 1573 self.focus.destroy(allocator); 1574 if (self.grid) |*grid| { 1575 grid.deinit(); 1576 self.grid = null; 1577 } 1578 } 1579 1580 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1581 _ = root_focus; 1582 self.clearGrid(); 1583 1584 // parse into rows of cells, then copy into a rectangular grid 1585 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 1586 defer { 1587 for (rows.items) |*row| row.deinit(allocator); 1588 rows.deinit(allocator); 1589 } 1590 var row: std.ArrayList(Grid.Cell) = .empty; 1591 errdefer row.deinit(allocator); 1592 1593 var style: Grid.Style = .{}; 1594 var width: usize = 0; 1595 const content = self.content; 1596 var i: usize = 0; 1597 while (i < content.len) { 1598 const byte = content[i]; 1599 if (byte == '\n') { 1600 width = @max(width, row.items.len); 1601 try rows.append(allocator, row); 1602 row = .empty; 1603 i += 1; 1604 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 1605 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 1606 var j = i + 2; 1607 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 1608 if (j >= content.len) { 1609 i = content.len; // malformed trailing escape; stop 1610 } else { 1611 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 1612 i = j + 1; 1613 } 1614 } else { 1615 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 1616 const end = @min(content.len, i + len); 1617 const rune = content[i..end]; 1618 const transparent = end - i == 1 and rune[0] == ' ' and 1619 style.fg == null and style.bg == null and !style.inverted; 1620 try row.append(allocator, .{ 1621 .rune = if (transparent) null else rune, 1622 .style = style, 1623 }); 1624 i = end; 1625 } 1626 } 1627 // a trailing row with content but no closing newline 1628 if (row.items.len > 0) { 1629 width = @max(width, row.items.len); 1630 try rows.append(allocator, row); 1631 } else { 1632 row.deinit(allocator); 1633 } 1634 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 1635 1636 const height = rows.items.len; 1637 if (width == 0 or height == 0) return; 1638 1639 const clamped_w = @min(width, constraint.max_size.width orelse width); 1640 const clamped_h = @min(height, constraint.max_size.height orelse height); 1641 1642 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 1643 errdefer grid.deinit(); 1644 for (rows.items[0..clamped_h], 0..) |r, y| { 1645 const n = @min(r.items.len, clamped_w); 1646 for (r.items[0..n], 0..) |cell, x| { 1647 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 1648 } 1649 } 1650 self.grid = grid; 1651 } 1652 1653 pub fn input(self: *AnsiArt, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1654 _ = self; 1655 _ = allocator; 1656 _ = key; 1657 _ = root_focus; 1658 } 1659 1660 pub fn clearGrid(self: *AnsiArt) void { 1661 if (self.grid) |*grid| { 1662 grid.deinit(); 1663 self.grid = null; 1664 } 1665 } 1666 1667 pub fn getGrid(self: AnsiArt) ?Grid { 1668 return self.grid; 1669 } 1670 1671 pub fn getFocus(self: *AnsiArt) *Focus { 1672 return self.focus; 1673 } 1674 1675 fn applySgr(style: *Grid.Style, params: []const u8) void { 1676 var nums: [16]u32 = undefined; 1677 var n: usize = 0; 1678 var it = std.mem.splitScalar(u8, params, ';'); 1679 while (it.next()) |tok| { 1680 if (n >= nums.len) break; 1681 // an empty parameter (e.g. bare "\x1b[m") means 0 1682 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 1683 n += 1; 1684 } 1685 if (n == 0) { 1686 style.* = .{}; 1687 return; 1688 } 1689 var i: usize = 0; 1690 while (i < n) : (i += 1) { 1691 switch (nums[i]) { 1692 0 => style.* = .{}, 1693 7 => style.inverted = true, 1694 27 => style.inverted = false, 1695 39 => style.fg = null, 1696 49 => style.bg = null, 1697 38, 48 => { 1698 // truecolor form: 38;2;r;g;b — anything else is ignored 1699 if (i + 4 < n and nums[i + 1] == 2) { 1700 const c = Grid.Color{ 1701 .r = @truncate(nums[i + 2]), 1702 .g = @truncate(nums[i + 3]), 1703 .b = @truncate(nums[i + 4]), 1704 }; 1705 if (nums[i] == 38) style.fg = c else style.bg = c; 1706 i += 4; 1707 } 1708 }, 1709 else => {}, 1710 } 1711 } 1712 } 1713 }; 1714 1715 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 1716 pub const AnsiBackground = struct { 1717 grid: ?Grid, 1718 child: *Widget, 1719 art: AnsiArt, 1720 session: *Session, 1721 1722 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, art_content: []const u8, session: *Session) !AnsiBackground { 1723 var cw = child_widget; 1724 const child = allocator.create(Widget) catch |e| { 1725 cw.deinit(allocator); 1726 return e; 1727 }; 1728 child.* = cw; 1729 errdefer { 1730 child.deinit(allocator); 1731 allocator.destroy(child); 1732 } 1733 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, art_content), .session = session }; 1734 } 1735 1736 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 1737 if (self.grid) |*grid| grid.deinit(); 1738 self.art.deinit(allocator); 1739 self.child.deinit(allocator); 1740 allocator.destroy(self.child); 1741 } 1742 1743 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1744 self.clearGrid(); 1745 1746 // make the wrapped page fill the whole available area 1747 try self.child.build(allocator, .{ 1748 .min_size = .{ 1749 .width = constraint.max_size.width orelse constraint.min_size.width, 1750 .height = constraint.max_size.height orelse constraint.min_size.height, 1751 }, 1752 .max_size = constraint.max_size, 1753 }, root_focus); 1754 1755 if (self.session.data.enable_ansi) { 1756 if (self.child.getGrid()) |fg| { 1757 self.grid = try artBehind(allocator, fg, &self.art, .top_right, root_focus); 1758 } 1759 } 1760 } 1761 1762 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1763 try self.child.input(allocator, key, root_focus); 1764 } 1765 1766 pub fn clearGrid(self: *AnsiBackground) void { 1767 if (self.grid) |*grid| { 1768 grid.deinit(); 1769 self.grid = null; 1770 } 1771 self.child.clearGrid(); 1772 self.art.clearGrid(); 1773 } 1774 1775 pub fn getGrid(self: AnsiBackground) ?Grid { 1776 return self.grid orelse self.child.getGrid(); 1777 } 1778 1779 pub fn getFocus(self: *AnsiBackground) *Focus { 1780 return self.child.getFocus(); 1781 } 1782 1783 // which top corner the art hugs. 1784 const ArtAnchor = enum { top_left, top_right }; 1785 1786 // a foreground cell counts as blank if it's empty or a bare space without styling 1787 fn cellIsBlank(cell: Grid.Cell) bool { 1788 if (cell.rune) |rune| { 1789 return std.mem.eql(u8, rune, " ") and 1790 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 1791 } 1792 return true; 1793 } 1794 1795 // the art is dimmed to this fraction of its brightness so foreground text 1796 // stays legible over it 1797 const art_brightness = 45; // percent 1798 1799 fn dimColor(color: ?Grid.Color) ?Grid.Color { 1800 const c = color orelse return null; 1801 return .{ 1802 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 1803 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 1804 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 1805 }; 1806 } 1807 1808 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 1809 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 1810 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 1811 // snap such channels clear of that range so the backdrop doesn't blink or 1812 // hide text there; the ≤9/255 shift is imperceptible on terminals that 1813 // actually render truecolor. 1814 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 1815 const c = color orelse return null; 1816 const snap = struct { 1817 fn f(v: u8) u8 { 1818 return if (v >= 1 and v <= 9) 10 else v; 1819 } 1820 }.f; 1821 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 1822 } 1823 1824 // composites ANSI art behind a foreground grid 1825 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art: *AnsiArt, anchor: ArtAnchor, root_focus: *Focus) !Grid { 1826 art.clearGrid(); 1827 try art.build(allocator, .{ 1828 .min_size = .{ .width = null, .height = null }, 1829 .max_size = .{ .width = foreground.size.width, .height = foreground.size.height }, 1830 }, root_focus); 1831 1832 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 1833 errdefer out.deinit(); 1834 1835 if (art.getGrid()) |art_grid| { 1836 const anchor_x = switch (anchor) { 1837 .top_left => 0, 1838 .top_right => foreground.size.width -| art_grid.size.width, 1839 }; 1840 for (0..art_grid.size.height) |y| { 1841 for (0..art_grid.size.width) |x| { 1842 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 1843 if (src.rune == null) continue; 1844 const idx = out.cells.at(.{ y, anchor_x + x }) catch continue; 1845 const dst = &out.cells.items[idx]; 1846 // composite the dimmed art behind every cell so it shows 1847 // through the whole UI: a blank cell becomes the art, while a 1848 // cell with a glyph keeps the glyph but takes the dimmed art as 1849 // its background (replacing whatever background it had, which 1850 // would otherwise obscure the art). 1851 if (cellIsBlank(dst.*)) { 1852 dst.* = src; 1853 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 1854 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 1855 } else { 1856 dst.style.bg = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 1857 } 1858 } 1859 } 1860 } 1861 return out; 1862 } 1863 }; 1864