╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭0cb523b5..╮ 0cb523b5.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (379) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig diff3.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
1354 } 1355 if (rawLink(root_focus, focus_id)) |url| { 1356 if (!mouse.ctrl) try requestRawLink(session, url); 1357 return; 1358 } 1359 root_focus.setFocus(focus_id); 1360 } 1361 // forward the press into the widget tree so buttons (and any 1362 // future click-aware widgets) can react. widgets that don't 1363 // care about presses ignore it. 1364 try root.input(allocator, key, root.getFocus()); 1365 } else { 1366 try root.input(allocator, key, root.getFocus()); 1367 } 1368 }, 1369 else => try root.input(allocator, key, root.getFocus()), 1370 } 1371 } 1372 1373 // a link to bytes the server serves directly rather than to a page route, so 1374 // it never resolves to a RoutablePage 1375 pub const raw_link_prefix = "ax:"; 1376 1377 // a button the web overlay covers with a file picker that posts the chosen 1378 // file to the url after the prefix 1379 pub const file_input_prefix = "file:"; 1380 1381 // a submit button that overrides its enclosing form's action 1382 pub const submit_action_prefix = "submit:"; 1383 1384 // the url an `ax:` link points at, or null for anything else. a host that 1385 // suppresses the anchor's own navigation needs this to follow the link. 1386 pub fn rawLink(root_focus: *Focus, focus_id: usize) ?[]const u8 { 1387 const child = root_focus.children.get(focus_id) orelse return null; 1388 const custom = switch (child.focus.kind) { 1389 .custom => |c| c, 1390 else => return null, 1391 }; 1392 if (!std.mem.startsWith(u8, custom, raw_link_prefix)) return null; 1393 return custom[raw_link_prefix.len..]; 1394 } 1395 1396 fn requestRawLink(session: *Session, url: []const u8) !void { 1397 session.host_request = .{ .show_copyable_text = try terminalWebUrl(session.page_arena.allocator(), session, url) }; 1398 } 1399 1400 fn terminalWebUrl(allocator: std.mem.Allocator, session: *const Session, path: []const u8) ![]const u8 { 1401 return if (session.web_port) |port| 1402 try std.fmt.allocPrint(allocator, "http://localhost:{d}{s}", .{ port, path }) 1403 else 1404 path; 1405 } 1406 1407 // if the focus target at focus_id is an `a:` link that should navigate (a 1408 // different parent page, or a different files directory within the repo page), 1409 // return its route; otherwise null. lets a host turn a click / enter on such a 1410 // link into a navigation rather than a focus change. 1411 pub fn crossPageLink(root_focus: *Focus, focus_id: usize, data: Session.Data) ?RoutablePage { 1412 const current = data.current_page; 1413 const child = root_focus.children.get(focus_id) orelse return null; 1414 const custom = switch (child.focus.kind) { 1415 .custom => |c| c, 1416 else => return null, 1417 }; 1418 const a_prefix = "a:"; 1419 if (!std.mem.startsWith(u8, custom, a_prefix)) return null; 1420 const path = custom[a_prefix.len..]; 1421 // local sessions build (and parse) links with the repo identity elided 1422 const route = (if (data.is_local) RoutablePage.fromUrlLocal(path) else RoutablePage.fromUrl(path)) orelse return null; 1423 // a link to a different parent page always navigates; within a page, a 1424 // files-directory / commits-page / list-window change navigates while tab 1425 // links stay in-page (header-handled). 1426 if (route.parent() != current.parent() or RoutablePage.repoPageChanged(route, current) or RoutablePage.homePageChanged(route, current) or RoutablePage.userPageChanged(route, current)) return route; 1427 return null; 1428 } 1429 1430 // a display author, resolved against the admin db at read time 1431 pub const Author = union(enum) { 1432 unknown, 1433 email: []const u8, // an email no user matches 1434 user_name: []const u8, 1435 1436 // the commit author line's email, resolved like initFromEmail 1437 pub fn init( 1438 haxy_moment: ?evt.AdminDB.HashMap(.read_only), 1439 arena: *std.heap.ArenaAllocator, 1440 author_line: []const u8, 1441 ) !Author { 1442 return initFromEmail(haxy_moment, arena, evt.authorEmail(author_line)); 1443 } 1444 1445 // from a record's stored author email: it resolves to the user currently 1446 // holding it, else stays the email. the result is allocated in `arena`, 1447 // so the email may borrow transient memory. 1448 pub fn initFromEmail( 1449 haxy_moment: ?evt.AdminDB.HashMap(.read_only), 1450 arena: *std.heap.ArenaAllocator, 1451 author_email: ?[]const u8, 1452 ) !Author { 1453 const email = author_email orelse return .unknown; 1454 if (haxy_moment) |moment| { 1455 if (try evt.User.readByEmail(evt.AdminDB, evt.admin_repo_opts.hash, moment, arena, email)) |user| { 1456 return .{ .user_name = user.event.name }; 1457 } 1458 } 1459 return .{ .email = try arena.allocator().dupe(u8, email) }; 1460 } 1461 }; 1462 1463 // the "a:" link to user `name`'s page. 1464 pub fn userLink(page_arena: *std.heap.ArenaAllocator, name: []const u8) ![]const u8 { 1465 const parsed = RoutablePage.Array(evt.User.name_max_len).from(name) orelse return error.RouteTooLong; 1466 const url = try (RoutablePage{ .user_repos = .{ .name = parsed } }).toUrl(page_arena); 1467 return std.fmt.allocPrint(page_arena.allocator(), "a:{s}", .{url}); 1468 } 1469 1470 // a focusable " author " box showing `author`, linking to their user page 1471 // when it is a known user 1472 pub fn authorBox(allocator: std.mem.Allocator, page_arena: *std.heap.ArenaAllocator, author: Author) !wgt.TextBox(Widget) { 1473 const text = switch (author) { 1474 .unknown => "", 1475 .email, .user_name => |t| t, 1476 }; 1477 var tb = try wgt.TextBox(Widget).init(allocator, text, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none, .label = " author " }); 1478 errdefer tb.deinit(allocator); 1479 tb.getFocus().focusable = true; 1480 switch (author) { 1481 .user_name => |name| tb.getFocus().kind = .{ .custom = try userLink(page_arena, name) }, 1482 else => {}, 1483 } 1484 return tb; 1485 } 1486 1487 // native-TUI navigation 1488 pub const Nav = struct { 1489 root: Widget, 1490 route: RoutablePage, 1491 // backs the current page (its Page data and the page-scoped strings its 1492 // widgets build). owned here, swapped on each navigation. session.page_arena 1493 // tracks whichever of these is current so widgets allocate into it. 1494 arena: *std.heap.ArenaAllocator, 1495 history: std.ArrayList(Entry), 1496 1497 // each retained page keeps its own arena, freed when the page leaves the 1498 // stack (popped on back, evicted at cap, or on deinit). this is what keeps a 1499 // long-lived session from accumulating every page it ever visited. 1500 const Entry = struct { root: Widget, route: RoutablePage, arena: *std.heap.ArenaAllocator }; 1501 1502 // cap on retained back-history so the chain can't grow memory without bound 1503 const max_history: usize = 16; 1504 1505 pub fn init(allocator: std.mem.Allocator, session: *Session) !Nav { 1506 const arena = try allocator.create(std.heap.ArenaAllocator); 1507 arena.* = std.heap.ArenaAllocator.init(allocator); 1508 errdefer { 1509 arena.deinit(); 1510 allocator.destroy(arena); 1511 } 1512 1513 session.page_arena = arena; 1514 const route = session.data.current_page; 1515 1516 const page = try arena.allocator().create(Page); 1517 page.* = try Page.init(arena, session, route); 1518 return .{ 1519 .root = try initRoot(allocator, page, session), 1520 .route = route, 1521 .arena = arena, 1522 .history = .empty, 1523 }; 1524 } 1525 1526 pub fn deinit(self: *Nav, allocator: std.mem.Allocator) void { 1527 self.root.deinit(allocator); 1528 freeArena(allocator, self.arena); 1529 for (self.history.items) |*entry| { 1530 entry.root.deinit(allocator); 1531 freeArena(allocator, entry.arena); 1532 } 1533 self.history.deinit(allocator); 1534 } 1535 1536 fn freeArena(allocator: std.mem.Allocator, arena: *std.heap.ArenaAllocator) void { 1537 arena.deinit(); 1538 allocator.destroy(arena); 1539 } 1540 1541 // reconcile the displayed root with the session's navigation state. a 1542 // forward nav (current_page moved to a different parent page) pushes the 1543 // current root and builds the new page in a fresh arena; a back request 1544 // frees the current page and restores the previous one. when escape is 1545 // pressed with no history left we switch to the quit tab instead of quitting. 1546 pub fn sync(self: *Nav, allocator: std.mem.Allocator, session: *Session) !void { 1547 // refresh: rebuild the current page in place from a current moment 1548 if (session.refresh_requested) { 1549 session.refresh_requested = false; 1550 if (session.haxy_moment != null or session.local != null) { 1551 const arena = try allocator.create(std.heap.ArenaAllocator); 1552 arena.* = std.heap.ArenaAllocator.init(allocator); 1553 errdefer freeArena(allocator, arena); 1554 1555 session.page_arena = arena; 1556 1557 const route = session.data.current_page; 1558 const page = try arena.allocator().create(Page); 1559 page.* = try Page.init(arena, session, route); 1560 const new_root = try initRoot(allocator, page, session); 1561 1562 self.root.deinit(allocator); 1563 freeArena(allocator, self.arena); 1564 self.root = new_root; 1565 self.route = route; 1566 self.arena = arena; 1567 } 1568 return; 1569 } 1570 1571 if (session.nav_back) { 1572 session.nav_back = false; 1573 if (self.history.pop()) |entry| { 1574 self.root.deinit(allocator); 1575 freeArena(allocator, self.arena); 1576 self.root = entry.root; 1577 self.route = entry.route; 1578 self.arena = entry.arena; 1579 session.page_arena = entry.arena; 1580 session.data.current_page = entry.route; 1581 return; 1582 } 1583 // nothing to go back to; switch to the quit confirmation 1584 const root_focus = self.root.getFocus(); 1585 var iter = root_focus.children.iterator(); 1586 while (iter.next()) |entry| { 1587 switch (entry.value_ptr.focus.kind) { 1588 .custom => |custom| if (std.mem.eql(u8, custom, Quit.tab_kind)) { 1589 root_focus.setFocus(entry.key_ptr.*); 1590 // a Stack only builds its selected child, so the quit 1591 // button isn't in the focus tree until a build runs with 1592 // the quit tab selected. build once, then send a 1593 // synthetic arrow_down to drop focus from the tab onto 1594 // the button so it's ready to confirm. 1595 try self.root.build(allocator, .{ 1596 .min_size = .{ .width = null, .height = 40 }, 1597 .max_size = .{ .width = 80, .height = null }, 1598 }, root_focus); 1599 try self.root.input(allocator, .arrow_down, root_focus); 1600 break; 1601 }, 1602 else => {}, 1603 } 1604 } 1605 return; 1606 } 1607 1608 // forward navigation: navigate() set next_page to the page to move to (a 1609 // cross-page link or tab change crossing pages) 1610 if (session.next_page) |route| { 1611 session.next_page = null; 1612 if (session.haxy_moment == null and session.local == null) return; 1613 // the page we navigated to becomes the current page 1614 session.data.current_page = route; 1615 1616 const arena = try allocator.create(std.heap.ArenaAllocator); 1617 arena.* = std.heap.ArenaAllocator.init(allocator); 1618 errdefer freeArena(allocator, arena); 1619 1620 session.page_arena = arena; 1621 1622 const page = try arena.allocator().create(Page); 1623 page.* = try Page.init(arena, session, route); 1624 const new_root = try initRoot(allocator, page, session); 1625 1626 try self.history.append(allocator, .{ .root = self.root, .route = self.route, .arena = self.arena }); 1627 // drop the oldest entry (freeing its widget tree and arena) once over cap 1628 if (self.history.items.len > max_history) { 1629 var oldest = self.history.orderedRemove(0); 1630 oldest.root.deinit(allocator); 1631 freeArena(allocator, oldest.arena); 1632 } 1633 self.root = new_root; 1634 self.route = route; 1635 self.arena = arena; 1636 } 1637 } 1638 }; 1639 1640 pub fn initRoot(allocator: std.mem.Allocator, page: *const Page, session: *Session) !Widget { 1641 const page_widget: Widget = switch (page.*) { 1642 .home => |*p| .{ .home = try .init(allocator, p, session) }, 1643 .user => |*p| .{ .user = try .init(allocator, p, session) }, 1644 .repo => |*p| .{ .repo = try .init(allocator, p, session) }, 1645 }; 1646 1647 const demon_art = @embedFile("embed/demon.ans"); 1648 1649 // on the TUI/SSH, the page sits above a one-row footer showing the url 1650 var root = if (session.is_terminal) blk: { 1651 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .vert }); 1652 errdefer box.deinit(allocator); 1653 const bg_id = bg_blk: { 1654 var background = try AnsiBackground.init(allocator, page_widget, demon_art, session); 1655 errdefer background.deinit(allocator); 1656 const id = background.getFocus().id; 1657 try box.children.put(allocator, id, .{ .widget = .{ .background = background }, .rect = null, .min_size = null }); 1658 break :bg_blk id; 1659 }; 1660 { 1661 var footer = try Footer.init(allocator, session); 1662 errdefer footer.deinit(allocator); 1663 try box.children.put(allocator, footer.getFocus().id, .{ .widget = .{ .footer = footer }, .rect = null, .min_size = .{ .width = null, .height = 1 } }); 1664 } 1665 box.getFocus().child_id = bg_id; 1666 break :blk Widget{ .box = box }; 1667 } else Widget{ .background = try AnsiBackground.init(allocator, page_widget, demon_art, session) }; 1668 errdefer root.deinit(allocator); 1669 1670 // input-owning views build their TextInputs in init — so reset the 1671 // focus-id -> *TextInput map here 1672 session.text_inputs.clearRetainingCapacity(); 1673 session.input_values.clearRetainingCapacity(); 1674 1675 try root.build(allocator, .{ 1676 .min_size = .{ .width = null, .height = 40 }, 1677 .max_size = .{ .width = 100, .height = null }, 1678 }, root.getFocus()); 1679 1680 return root; 1681 } 1682 1683 pub const Widget = union(enum) { 1684 text: wgt.Text(Widget), 1685 box: wgt.Box(Widget), 1686 text_box: wgt.TextBox(Widget), 1687 text_input: wgt.TextInput(Widget), 1688 scroll: wgt.Scroll(Widget), 1689 stack: wgt.Stack(Widget), 1690 flow_box: FlowBox, 1691 flow_box_scroll: FlowBox.Scroll, 1692 tag_flow: TagFlow, 1693 spacer: Spacer, 1694 center: Center, 1695 section_label: SectionLabel, 1696 submit_button: SubmitButton, 1697 background: AnsiBackground, 1698 home: Home.View, 1699 user: User.View, 1700 repo: Repo.View, 1701 quit: Quit.View, 1702 unauthorized: Unauthorized.View, 1703 title: Title.View, 1704 sub_title: SubTitle.View, 1705 home_header: Home.Header.View, 1706 user_header: User.Header.View, 1707 repo_header: Repo.Header.View, 1708 repo_files_header: Repo.Files.Header.View, 1709 repo_commits_header: Repo.Commits.Header.View, 1710 repo_issues_header: Repo.Issues.Header, 1711 repo_files: Repo.Files.View, 1712 repo_commits: Repo.Commits.View, 1713 repo_refs: Repo.Refs.View, 1714 repo_issues: Repo.Issues.View, 1715 repo_events_header: Repo.Events.Header.View, 1716 repo_events: Repo.Events.View, 1717 repo_comment: Repo.Comment.Item, 1718 clone_url: CloneUrl.View, 1719 home_users: Home.Users.View, 1720 home_repos: Home.Repos.View, 1721 auth_tab: Home.Header.AuthTab.View, 1722 home_settings: Home.Settings.View, 1723 home_auth: Home.Auth.View, 1724 footer: Footer, 1725 1726 pub fn deinit(self: *Widget, allocator: std.mem.Allocator) void { 1727 switch (self.*) { 1728 inline else => |*case| case.deinit(allocator), 1729 } 1730 } 1731 1732 pub fn build(self: *Widget, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) anyerror!void { 1733 switch (self.*) { 1734 inline else => |*case| try case.build(allocator, constraint, root_focus), 1735 } 1736 } 1737 1738 pub fn input(self: *Widget, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) anyerror!void { 1739 switch (self.*) { 1740 inline else => |*case| try case.input(allocator, key, root_focus), 1741 } 1742 } 1743 1744 pub fn clearGrid(self: *Widget) void { 1745 switch (self.*) { 1746 inline else => |*case| case.clearGrid(), 1747 } 1748 } 1749 1750 pub fn getGrid(self: Widget) ?Grid { 1751 switch (self) { 1752 inline else => |*case| return case.getGrid(), 1753 } 1754 } 1755 1756 pub fn getFocus(self: *Widget) *Focus { 1757 switch (self.*) { 1758 inline else => |*case| return case.getFocus(), 1759 } 1760 } 1761 }; 1762 1763 // move the focused row in `box` by `delta`, clamped to the ends, scrolling 1764 // `scroll` to keep it visible. 1765 pub fn moveRowFocus(box: *wgt.Box(Widget), scroll: *wgt.Scroll(Widget), root_focus: *Focus, delta: isize) void { 1766 const keys = box.children.keys(); 1767 if (keys.len == 0) return; 1768 const cur_id = box.getFocus().child_id orelse return; 1769 const cur: isize = @intCast(box.children.getIndex(cur_id) orelse return); 1770 const last: isize = @intCast(keys.len - 1); 1771 const next: usize = @intCast(std.math.clamp(cur + delta, 0, last)); 1772 if (next == @as(usize, @intCast(cur))) return; 1773 root_focus.setFocus(keys[next]); 1774 if (box.children.values()[next].rect) |rect| scroll.scrollToRect(rect); 1775 } 1776 1777 pub const FlowBox = struct { 1778 focus: *Focus, 1779 grid: ?Grid, 1780 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 1781 // backs the per-item strings the text boxes borrow: each box's `content` 1782 // and, for link items, its `.custom` focus kind (e.g. "a:/user/foo"). reset 1783 // wholesale on each setItems so there's no per-string ownership to track. 1784 arena: std.heap.ArenaAllocator, 1785 // column count from the last build — FlowBox.Scroll.input uses it so arrow 1786 // up/down can step by a row's worth of items. 1787 last_cols: usize, 1788 options: Options, 1789 1790 const border_rows: usize = 2; 1791 1792 pub const Options = struct { 1793 cell_width: usize = 40, 1794 cell_height: usize = 3, 1795 }; 1796 1797 pub fn init(allocator: std.mem.Allocator, options: Options) !FlowBox { 1798 return .{ 1799 .focus = try Focus.create(allocator, .container), 1800 .grid = null, 1801 .text_boxes = .empty, 1802 .arena = std.heap.ArenaAllocator.init(allocator), 1803 .last_cols = 1, 1804 .options = options, 1805 }; 1806 } 1807 1808 pub fn deinit(self: *FlowBox, allocator: std.mem.Allocator) void { 1809 self.focus.destroy(allocator); 1810 if (self.grid) |*grid| { 1811 grid.deinit(); 1812 self.grid = null; 1813 } 1814 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 1815 self.text_boxes.deinit(allocator); 1816 self.arena.deinit(); 1817 } 1818 1819 // one flow item: its display text plus an optional link. a non-empty `link` 1820 // sets the item's focus kind such as `.{ .custom = "a:/user/foo" }`, which 1821 // the web renderer turns into an anchor. 1822 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 1823 1824 // both the item text and the link are copied into the arena, so the caller's 1825 // slices needn't outlive this call. 1826 pub fn setItems(self: *FlowBox, allocator: std.mem.Allocator, items: []const Item) !void { 1827 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 1828 self.text_boxes.clearAndFree(allocator); 1829 1830 // the old text boxes (and their borrowed content/links) are gone now, so 1831 // the arena that backed those strings can be reclaimed. 1832 _ = self.arena.reset(.retain_capacity); 1833 const aa = self.arena.allocator(); 1834 1835 self.focus.clear(); 1836 self.focus.child_id = null; 1837 1838 for (items) |item| { 1839 const line = try aa.dupe(u8, item.text); 1840 1841 var text_box = try wgt.TextBox(Widget).init(allocator, line, .{ .border_style = .hidden, .rounded_corners = true, .wrap_kind = .word }); 1842 errdefer text_box.deinit(allocator); 1843 text_box.getFocus().focusable = true; 1844 1845 if (item.link.len > 0) { 1846 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 1847 } 1848 1849 try self.text_boxes.append(allocator, text_box); 1850 } 1851 1852 if (self.text_boxes.items.len > 0) { 1853 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 1854 } 1855 } 1856 1857 pub fn build(self: *FlowBox, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1858 self.clearGrid(); 1859 self.focus.clear(); 1860 1861 const cell_width = self.options.cell_width; 1862 const max_width = constraint.max_size.width orelse cell_width; 1863 const cols = if (cell_width == 0) 1 else @max(1, max_width / cell_width); 1864 self.last_cols = cols; 1865 1866 const count = self.text_boxes.items.len; 1867 if (count == 0) return; 1868 const slot_height = self.options.cell_height + border_rows; 1869 if (slot_height == 0) return; 1870 1871 // build at the slot size so every text box fits a single grid cell 1872 for (self.text_boxes.items) |*tb| { 1873 tb.options.border_style = if (self.focus.child_id == tb.getFocus().id) .single else .hidden; 1874 try tb.build(allocator, .{ 1875 .min_size = .{ .width = cell_width, .height = null }, 1876 .max_size = .{ .width = cell_width, .height = slot_height }, 1877 }, root_focus); 1878 } 1879 1880 const rows = (count + cols - 1) / cols; 1881 const content_height = rows * slot_height; 1882 const total_width = cols * cell_width; 1883 if (total_width == 0 or content_height == 0) return; 1884 1885 var grid = try Grid.init(allocator, .{ .width = total_width, .height = content_height }); 1886 errdefer grid.deinit(); 1887 1888 for (self.text_boxes.items, 0..) |*tb, i| { 1889 const tb_grid = tb.getGrid() orelse continue; 1890 const col = i % cols; 1891 const row = i / cols; 1892 const cell_x = col * cell_width; 1893 const cell_y = row * slot_height; 1894 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, cell_x, cell_y); 1895 try grid.drawGrid(tb_grid, cell_x, cell_y); 1896 } 1897 1898 self.grid = grid; 1899 } 1900 1901 pub fn input(self: *FlowBox, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1902 _ = self; 1903 _ = allocator; 1904 _ = key; 1905 _ = root_focus; 1906 } 1907 1908 pub fn clearGrid(self: *FlowBox) void { 1909 if (self.grid) |*grid| { 1910 grid.deinit(); 1911 self.grid = null; 1912 } 1913 for (self.text_boxes.items) |*tb| tb.clearGrid(); 1914 } 1915 1916 pub fn getGrid(self: FlowBox) ?Grid { 1917 return self.grid; 1918 } 1919 1920 pub fn getFocus(self: *FlowBox) *Focus { 1921 return self.focus; 1922 } 1923 1924 pub fn cellRect(self: FlowBox, index: usize) ?layout.IRect { 1925 if (self.last_cols == 0 or index >= self.text_boxes.items.len) return null; 1926 const slot_height = self.options.cell_height + border_rows; 1927 const col = index % self.last_cols; 1928 const row = index / self.last_cols; 1929 return .{ 1930 .x = @intCast(col * self.options.cell_width), 1931 .y = @intCast(row * slot_height), 1932 .size = .{ .width = self.options.cell_width, .height = slot_height }, 1933 }; 1934 } 1935 1936 pub fn indexOfFocusId(self: FlowBox, focus_id: usize) ?usize { 1937 for (self.text_boxes.items, 0..) |tb, i| { 1938 if (tb.box.focus.id == focus_id) return i; 1939 } 1940 return null; 1941 } 1942 1943 pub const Scroll = struct { 1944 scroll: wgt.Scroll(Widget), 1945 1946 pub fn init(allocator: std.mem.Allocator, options: FlowBox.Options, web_native: bool) !Scroll { 1947 var layout_inner = try FlowBox.init(allocator, options); 1948 errdefer layout_inner.deinit(allocator); 1949 var scroll = try wgt.Scroll(Widget).init(allocator, .{ .flow_box = layout_inner }, .{ .direction = .vert, .web_native = web_native }); 1950 errdefer scroll.deinit(allocator); 1951 return .{ .scroll = scroll }; 1952 } 1953 1954 pub fn deinit(self: *Scroll, allocator: std.mem.Allocator) void { 1955 self.scroll.deinit(allocator); 1956 } 1957 1958 pub fn setItems(self: *Scroll, allocator: std.mem.Allocator, items: []const Item) !void { 1959 self.scroll.x = 0; 1960 self.scroll.y = 0; 1961 try self.inner().setItems(allocator, items); 1962 } 1963 1964 pub fn build(self: *Scroll, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1965 try self.scroll.build(allocator, constraint, root_focus); 1966 } 1967 1968 pub fn input(self: *Scroll, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 1969 _ = allocator; 1970 const in = self.inner(); 1971 const child_id = in.focus.child_id orelse return; 1972 const current_index = in.indexOfFocusId(child_id) orelse return; 1973 const count = in.text_boxes.items.len; 1974 if (count == 0) return; 1975 const cols = in.last_cols; 1976 const slot_height = in.options.cell_height + FlowBox.border_rows; 1977 1978 var index = current_index; 1979 switch (key) { 1980 .arrow_up => index -|= cols, 1981 .arrow_down => if (index + cols < count) { 1982 index += cols; 1983 }, 1984 .arrow_left => index -|= 1, 1985 .arrow_right => if (index + 1 < count) { 1986 index += 1; 1987 }, 1988 .home => index = 0, 1989 .end => index = count - 1, 1990 .page_up => { 1991 if (self.scroll.grid) |grid| if (slot_height > 0) { 1992 const rows_per_page = grid.size.height / slot_height; 1993 index -|= rows_per_page * cols; 1994 }; 1995 }, 1996 .page_down => { 1997 if (self.scroll.grid) |grid| if (slot_height > 0) { 1998 const rows_per_page = grid.size.height / slot_height; 1999 index = @min(index + rows_per_page * cols, count - 1); 2000 }; 2001 }, 2002 // scroll wheel moves the focused cell by a full row so the 2003 // viewport (via scrollToRect) follows in row-sized steps, 2004 // matching how a scroll wheel feels in a grid view. 2005 .mouse => |mouse| switch (mouse.action) { 2006 .scroll => |dir| switch (dir) { 2007 .up => index -|= cols, 2008 .down => if (index + cols < count) { 2009 index += cols; 2010 }, 2011 }, 2012 else => {}, 2013 }, 2014 else => {}, 2015 } 2016 2017 if (index != current_index) { 2018 root_focus.setFocus(in.text_boxes.items[index].getFocus().id); 2019 if (in.cellRect(index)) |rect| { 2020 self.scroll.scrollToRect(rect); 2021 } 2022 } 2023 } 2024 2025 pub fn clearGrid(self: *Scroll) void { 2026 self.scroll.clearGrid(); 2027 } 2028 2029 pub fn getGrid(self: Scroll) ?Grid { 2030 return self.scroll.getGrid(); 2031 } 2032 2033 pub fn getFocus(self: *Scroll) *Focus { 2034 return self.scroll.getFocus(); 2035 } 2036 2037 pub fn getSelectedIndex(self: Scroll) ?usize { 2038 const in = self.scroll.child.flow_box; 2039 const child_id = in.focus.child_id orelse return null; 2040 return in.indexOfFocusId(child_id); 2041 } 2042 2043 fn inner(self: *Scroll) *FlowBox { 2044 return &self.scroll.child.flow_box; 2045 } 2046 }; 2047 }; 2048 2049 // a left-to-right flow of variable-width focusable items that wraps at the 2050 // available width, like words in a paragraph. unlike FlowBox there is no cell 2051 // grid: each item is as wide as its text. selection movement is driven by the 2052 // owning view via indexOfFocusId/verticalNeighbor. 2053 pub const TagFlow = struct { 2054 focus: *Focus, 2055 grid: ?Grid, 2056 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 2057 // last build's item rects (content space), for vertical navigation and 2058 // scroll-into-view. 2059 rects: std.ArrayList(layout.IRect), 2060 // backs the per-item strings the text boxes borrow. 2061 arena: std.heap.ArenaAllocator, 2062 2063 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 2064 2065 pub fn init(allocator: std.mem.Allocator) !TagFlow { 2066 return .{ 2067 .focus = try Focus.create(allocator, .container), 2068 .grid = null, 2069 .text_boxes = .empty, 2070 .rects = .empty, 2071 .arena = std.heap.ArenaAllocator.init(allocator), 2072 }; 2073 } 2074 2075 pub fn deinit(self: *TagFlow, allocator: std.mem.Allocator) void { 2076 self.focus.destroy(allocator); 2077 if (self.grid) |*grid| { 2078 grid.deinit(); 2079 self.grid = null; 2080 } 2081 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2082 self.text_boxes.deinit(allocator); 2083 self.rects.deinit(allocator); 2084 self.arena.deinit(); 2085 } 2086 2087 // both the item text and the link are copied into the arena, so the caller's 2088 // slices needn't outlive this call. 2089 pub fn setItems(self: *TagFlow, allocator: std.mem.Allocator, items: []const Item) !void { 2090 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2091 self.text_boxes.clearAndFree(allocator); 2092 2093 _ = self.arena.reset(.retain_capacity); 2094 const aa = self.arena.allocator(); 2095 2096 self.focus.clear(); 2097 self.focus.child_id = null; 2098 2099 for (items) |item| { 2100 const line = try aa.dupe(u8, item.text); 2101 2102 var text_box = try wgt.TextBox(Widget).init(allocator, line, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2103 errdefer text_box.deinit(allocator); 2104 text_box.getFocus().focusable = true; 2105 2106 if (item.link.len > 0) { 2107 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 2108 } 2109 2110 try self.text_boxes.append(allocator, text_box); 2111 } 2112 2113 if (self.text_boxes.items.len > 0) { 2114 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2115 } 2116 } 2117 2118 pub fn build(self: *TagFlow, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2119 self.clearGrid(); 2120 self.focus.clear(); 2121 2122 if (self.text_boxes.items.len == 0) return; 2123 const max_width = constraint.max_size.width orelse 80; 2124 if (max_width == 0) return; 2125 2126 // lay the items out left to right, wrapping to a new row when the next 2127 // one wouldn't fit. 2128 self.rects.clearRetainingCapacity(); 2129 var x: usize = 0; 2130 var y: usize = 0; 2131 var row_height: usize = 0; 2132 var total_width: usize = 0; 2133 for (self.text_boxes.items) |*tb| { 2134 try tb.build(allocator, .{ 2135 .min_size = .{ .width = null, .height = null }, 2136 .max_size = .{ .width = max_width, .height = null }, 2137 }, root_focus); 2138 const tb_grid_maybe = tb.getGrid(); 2139 const w: usize = if (tb_grid_maybe) |g| g.size.width else 0; 2140 const h: usize = if (tb_grid_maybe) |g| g.size.height else 0; 2141 if (x > 0 and x + w > max_width) { 2142 x = 0; 2143 y += row_height; 2144 row_height = 0; 2145 } 2146 try self.rects.append(allocator, .{ .x = @intCast(x), .y = @intCast(y), .size = .{ .width = w, .height = h } }); 2147 if (h > row_height) row_height = h; 2148 x += w; 2149 if (x > total_width) total_width = x; 2150 } 2151 2152 const total_height = y + row_height; 2153 if (total_width == 0 or total_height == 0) return; 2154 2155 var grid = try Grid.init(allocator, .{ .width = total_width, .height = total_height }); 2156 errdefer grid.deinit(); 2157 2158 for (self.text_boxes.items, self.rects.items) |*tb, rect| { 2159 const tb_grid = tb.getGrid() orelse continue; 2160 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, @intCast(rect.x), @intCast(rect.y)); 2161 try grid.drawGrid(tb_grid, @intCast(rect.x), @intCast(rect.y)); 2162 } 2163 2164 self.grid = grid; 2165 } 2166 2167 pub fn input(self: *TagFlow, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2168 _ = self; 2169 _ = allocator; 2170 _ = key; 2171 _ = root_focus; 2172 } 2173 2174 pub fn clearGrid(self: *TagFlow) void { 2175 if (self.grid) |*grid| { 2176 grid.deinit(); 2177 self.grid = null; 2178 } 2179 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2180 } 2181 2182 pub fn getGrid(self: TagFlow) ?Grid { 2183 return self.grid; 2184 } 2185 2186 pub fn getFocus(self: *TagFlow) *Focus { 2187 return self.focus; 2188 } 2189 2190 pub fn indexOfFocusId(self: TagFlow, focus_id: usize) ?usize { 2191 for (self.text_boxes.items, 0..) |tb, i| { 2192 if (tb.box.focus.id == focus_id) return i; 2193 } 2194 return null; 2195 } 2196 2197 // the first item of the row below (when `downward`) or above, or null at 2198 // the flow's edge. items are laid out in order, so y is nondecreasing. 2199 pub fn rowStep(self: TagFlow, index: usize, downward: bool) ?usize { 2200 const rects = self.rects.items; 2201 if (index >= rects.len) return null; 2202 const cur_y = rects[index].y; 2203 if (downward) { 2204 for (rects[index + 1 ..], index + 1..) |r, i| { 2205 if (r.y > cur_y) return i; 2206 } 2207 return null; 2208 } 2209 // walk the earlier rows; the last one visited is the row above. 2210 var prev_first: ?usize = null; 2211 var i: usize = 0; 2212 while (i < rects.len and rects[i].y < cur_y) { 2213 prev_first = i; 2214 const y = rects[i].y; 2215 while (i < rects.len and rects[i].y == y) i += 1; 2216 } 2217 return prev_first; 2218 } 2219 }; 2220 2221 // an invisible widget that fills the horizontal space granted by its parent. 2222 // used inside Box(horiz) with a min_size so the box reserves space for the 2223 // children that follow, pushing them to the right. 2224 pub const Spacer = struct { 2225 focus: *Focus, 2226 grid: ?Grid, 2227 2228 pub fn init(allocator: std.mem.Allocator) !Spacer { 2229 return .{ 2230 .focus = try Focus.create(allocator, .container), 2231 .grid = null, 2232 }; 2233 } 2234 2235 pub fn deinit(self: *Spacer, allocator: std.mem.Allocator) void { 2236 self.focus.destroy(allocator); 2237 if (self.grid) |*grid| { 2238 grid.deinit(); 2239 self.grid = null; 2240 } 2241 } 2242 2243 pub fn build(self: *Spacer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2244 _ = root_focus; 2245 self.clearGrid(); 2246 const width = constraint.max_size.width orelse return; 2247 if (width == 0) return; 2248 self.grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2249 } 2250 2251 pub fn input(self: *Spacer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2252 _ = self; 2253 _ = allocator; 2254 _ = key; 2255 _ = root_focus; 2256 } 2257 2258 pub fn clearGrid(self: *Spacer) void { 2259 if (self.grid) |*grid| { 2260 grid.deinit(); 2261 self.grid = null; 2262 } 2263 } 2264 2265 pub fn getGrid(self: Spacer) ?Grid { 2266 return self.grid; 2267 } 2268 2269 pub fn getFocus(self: *Spacer) *Focus { 2270 return self.focus; 2271 } 2272 }; 2273 2274 // a one-row, non-focusable status bar showing the current page's url 2275 pub const Footer = struct { 2276 focus: *Focus, 2277 grid: ?Grid, 2278 session: *Session, 2279 arena: std.heap.ArenaAllocator, 2280 url: []const u8 = "", 2281 url_width: usize = 0, 2282 2283 pub fn init(allocator: std.mem.Allocator, session: *Session) !Footer { 2284 return .{ 2285 .focus = try Focus.create(allocator, .container), 2286 .grid = null, 2287 .session = session, 2288 .arena = std.heap.ArenaAllocator.init(allocator), 2289 }; 2290 } 2291 2292 pub fn deinit(self: *Footer, allocator: std.mem.Allocator) void { 2293 self.focus.destroy(allocator); 2294 if (self.grid) |*grid| grid.deinit(); 2295 self.arena.deinit(); 2296 } 2297 2298 pub fn build(self: *Footer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2299 _ = root_focus; 2300 self.clearGrid(); 2301 const width = constraint.max_size.width orelse return; 2302 if (width == 0) return; 2303 2304 _ = self.arena.reset(.retain_capacity); 2305 self.url = ""; 2306 self.url_width = 0; 2307 const aa = self.arena.allocator(); 2308 const path = self.session.data.current_page.toUrl(&self.arena) catch return; 2309 const text = terminalWebUrl(aa, self.session, path) catch return; 2310 self.url = text; 2311 2312 var grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2313 errdefer grid.deinit(); 2314 var utf8 = (std.unicode.Utf8View.init(text) catch return).iterator(); 2315 var i: usize = 0; 2316 while (utf8.nextCodepointSlice()) |ch| { 2317 if (i == width) break; 2318 grid.cells.items[try grid.cells.at(.{ 0, i })].rune = ch; 2319 i += 1; 2320 } 2321 self.url_width = i; 2322 self.grid = grid; 2323 } 2324 2325 pub fn input(self: *Footer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2326 _ = allocator; 2327 switch (key) { 2328 .mouse => |mouse| { 2329 if (mouse.ctrl or !inp.leftClickOn(root_focus, self.getFocus().id, mouse)) return; 2330 const rect = (root_focus.children.get(self.getFocus().id) orelse return).rect; 2331 if (mouse.x < rect.x + self.url_width) self.session.host_request = .{ .show_copyable_text = self.url }; 2332 }, 2333 else => {}, 2334 } 2335 } 2336 2337 pub fn clearGrid(self: *Footer) void { 2338 if (self.grid) |*grid| { 2339 grid.deinit(); 2340 self.grid = null; 2341 } 2342 } 2343 2344 pub fn getGrid(self: Footer) ?Grid { 2345 return self.grid; 2346 } 2347 2348 pub fn getFocus(self: *Footer) *Focus { 2349 return self.focus; 2350 } 2351 }; 2352 2353 // a single-child wrapper that builds the child at its natural size and 2354 // positions its grid in the middle of the area granted by the parent 2355 // a bordered label, indented past the content it precedes 2356 pub const SectionLabel = struct { 2357 box: wgt.Box(Widget), 2358 2359 pub fn init(allocator: std.mem.Allocator, content: []const u8) !SectionLabel { 2360 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2361 errdefer box.deinit(allocator); 2362 2363 { 2364 var gap = try wgt.Text(Widget).init(allocator, " "); 2365 errdefer gap.deinit(allocator); 2366 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2367 } 2368 2369 { 2370 var tb = try wgt.TextBox(Widget).init(allocator, content, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2371 errdefer tb.deinit(allocator); 2372 tb.getFocus().focusable = true; 2373 try box.children.put(allocator, tb.getFocus().id, .{ .widget = .{ .text_box = tb }, .rect = null, .min_size = null }); 2374 } 2375 2376 box.getFocus().child_id = box.children.keys()[1]; 2377 return .{ .box = box }; 2378 } 2379 2380 pub fn deinit(self: *SectionLabel, allocator: std.mem.Allocator) void { 2381 self.box.deinit(allocator); 2382 } 2383 2384 pub fn build(self: *SectionLabel, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2385 try self.box.build(allocator, constraint, root_focus); 2386 } 2387 2388 pub fn input(self: *SectionLabel, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2389 _ = self; 2390 _ = allocator; 2391 _ = key; 2392 _ = root_focus; 2393 } 2394 2395 pub fn clearGrid(self: *SectionLabel) void { 2396 self.box.clearGrid(); 2397 } 2398 2399 pub fn getGrid(self: SectionLabel) ?Grid { 2400 return self.box.getGrid(); 2401 } 2402 2403 pub fn getFocus(self: *SectionLabel) *Focus { 2404 return self.box.getFocus(); 2405 } 2406 }; 2407 2408 // a submit button, indented past its form's content. the web overlay POSTs 2409 // the button's form; terminal hosts detect presses through `buttonId`. 2410 pub const SubmitButton = struct { 2411 box: wgt.Box(Widget), 2412 2413 pub fn init(allocator: std.mem.Allocator) !SubmitButton { 2414 return initLabeled(allocator, "submit"); 2415 } 2416 2417 pub fn initLabeled(allocator: std.mem.Allocator, label: []const u8) !SubmitButton { 2418 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2419 errdefer box.deinit(allocator); 2420 2421 { 2422 var gap = try wgt.Text(Widget).init(allocator, " "); 2423 errdefer gap.deinit(allocator); 2424 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2425 } 2426 2427 { 2428 var button = try wgt.TextBox(Widget).init(allocator, label, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2429 errdefer button.deinit(allocator); 2430 button.getFocus().focusable = true; 2431 // the renderer distinguishes plain clickables from buttons that 2432 // should POST to a server route by this kind. 2433 button.getFocus().kind = .{ .custom = "submit" }; 2434 try box.children.put(allocator, button.getFocus().id, .{ .widget = .{ .text_box = button }, .rect = null, .min_size = .{ .width = label.len + 2, .height = null } }); 2435 } 2436 2437 box.getFocus().child_id = box.children.keys()[1]; 2438 return .{ .box = box }; 2439 } 2440 2441 pub fn deinit(self: *SubmitButton, allocator: std.mem.Allocator) void { 2442 self.box.deinit(allocator); 2443 } 2444 2445 pub fn build(self: *SubmitButton, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2446 try self.box.build(allocator, constraint, root_focus); 2447 } 2448 2449 pub fn input(self: *SubmitButton, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2450 _ = self; 2451 _ = allocator; 2452 _ = key; 2453 _ = root_focus; 2454 } 2455 2456 pub fn clearGrid(self: *SubmitButton) void { 2457 self.box.clearGrid(); 2458 } 2459 2460 pub fn getGrid(self: SubmitButton) ?Grid { 2461 return self.box.getGrid(); 2462 } 2463 2464 pub fn getFocus(self: *SubmitButton) *Focus { 2465 return self.box.getFocus(); 2466 } 2467 2468 // the button's focus id, for click hit-testing 2469 pub fn buttonId(self: *const SubmitButton) usize { 2470 return self.box.children.keys()[1]; 2471 } 2472 }; 2473 2474 pub const Center = struct { 2475 focus: *Focus, 2476 grid: ?Grid, 2477 child: *Widget, 2478 2479 pub fn init(allocator: std.mem.Allocator, child_widget: Widget) !Center { 2480 const child = try allocator.create(Widget); 2481 errdefer allocator.destroy(child); 2482 child.* = child_widget; 2483 return .{ 2484 .focus = try Focus.create(allocator, .container), 2485 .grid = null, 2486 .child = child, 2487 }; 2488 } 2489 2490 pub fn deinit(self: *Center, allocator: std.mem.Allocator) void { 2491 self.focus.destroy(allocator); 2492 if (self.grid) |*grid| { 2493 grid.deinit(); 2494 self.grid = null; 2495 } 2496 self.child.deinit(allocator); 2497 allocator.destroy(self.child); 2498 } 2499 2500 pub fn build(self: *Center, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2501 self.clearGrid(); 2502 self.getFocus().clear(); 2503 2504 // build the child without forcing it to fill min_size; it sizes 2505 // itself to its content within the available max. 2506 try self.child.build(allocator, .{ 2507 .min_size = .{ .width = null, .height = null }, 2508 .max_size = constraint.max_size, 2509 }, root_focus); 2510 2511 const child_grid = self.child.getGrid() orelse return; 2512 2513 // prefer max when given; otherwise grow to max(min, child) so that 2514 // when only a min is set (e.g. the wasm path passes viewport rows 2515 // as min_height with no max), we can still vertically center while 2516 // letting taller content extend past the min. 2517 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; 2518 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; 2519 if (width == 0 or height == 0) return; 2520 2521 const offset_x: usize = (width -| child_grid.size.width) / 2; 2522 const offset_y: usize = (height -| child_grid.size.height) / 2; 2523 2524 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 2525 errdefer grid.deinit(); 2526 try grid.drawGrid(child_grid, offset_x, offset_y); 2527 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 2528 self.getFocus().child_id = self.child.getFocus().id; 2529 2530 self.grid = grid; 2531 } 2532 2533 pub fn input(self: *Center, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2534 try self.child.input(allocator, key, root_focus); 2535 } 2536 2537 pub fn clearGrid(self: *Center) void { 2538 if (self.grid) |*grid| { 2539 grid.deinit(); 2540 self.grid = null; 2541 } 2542 self.child.clearGrid(); 2543 } 2544 2545 pub fn getGrid(self: Center) ?Grid { 2546 return self.grid; 2547 } 2548 2549 pub fn getFocus(self: *Center) *Focus { 2550 return self.focus; 2551 } 2552 }; 2553 2554 // renders truecolor ANSI art 2555 pub const AnsiArt = struct { 2556 focus: *Focus, 2557 grid: ?Grid, 2558 content: []const u8, 2559 2560 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 2561 return .{ 2562 .focus = try Focus.create(allocator, .container), 2563 .grid = null, 2564 .content = content, 2565 }; 2566 } 2567 2568 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 2569 self.focus.destroy(allocator); 2570 if (self.grid) |*grid| { 2571 grid.deinit(); 2572 self.grid = null; 2573 } 2574 } 2575 2576 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2577 _ = root_focus; 2578 self.clearGrid(); 2579 2580 // parse into rows of cells, then copy into a rectangular grid 2581 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 2582 defer { 2583 for (rows.items) |*row| row.deinit(allocator); 2584 rows.deinit(allocator); 2585 } 2586 var row: std.ArrayList(Grid.Cell) = .empty; 2587 errdefer row.deinit(allocator); 2588 2589 var style: Grid.Style = .{}; 2590 var width: usize = 0; 2591 const content = self.content; 2592 var i: usize = 0; 2593 while (i < content.len) { 2594 const byte = content[i]; 2595 if (byte == '\n') { 2596 width = @max(width, row.items.len); 2597 try rows.append(allocator, row); 2598 row = .empty; 2599 i += 1; 2600 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 2601 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 2602 var j = i + 2; 2603 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 2604 if (j >= content.len) { 2605 i = content.len; // malformed trailing escape; stop 2606 } else { 2607 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 2608 i = j + 1; 2609 } 2610 } else { 2611 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 2612 const end = @min(content.len, i + len); 2613 const rune = content[i..end]; 2614 const transparent = end - i == 1 and rune[0] == ' ' and 2615 style.fg == null and style.bg == null and !style.inverted; 2616 try row.append(allocator, .{ 2617 .rune = if (transparent) null else rune, 2618 .style = style, 2619 }); 2620 i = end; 2621 } 2622 } 2623 // a trailing row with content but no closing newline 2624 if (row.items.len > 0) { 2625 width = @max(width, row.items.len); 2626 try rows.append(allocator, row); 2627 } else { 2628 row.deinit(allocator); 2629 } 2630 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 2631 2632 const height = rows.items.len; 2633 if (width == 0 or height == 0) return; 2634 2635 const clamped_w = @min(width, constraint.max_size.width orelse width); 2636 const clamped_h = @min(height, constraint.max_size.height orelse height); 2637 2638 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 2639 errdefer grid.deinit(); 2640 for (rows.items[0..clamped_h], 0..) |r, y| { 2641 const n = @min(r.items.len, clamped_w); 2642 for (r.items[0..n], 0..) |cell, x| { 2643 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 2644 } 2645 } 2646 self.grid = grid; 2647 } 2648 2649 pub fn clearGrid(self: *AnsiArt) void { 2650 if (self.grid) |*grid| { 2651 grid.deinit(); 2652 self.grid = null; 2653 } 2654 } 2655 2656 pub fn getGrid(self: AnsiArt) ?Grid { 2657 return self.grid; 2658 } 2659 2660 pub fn getFocus(self: *AnsiArt) *Focus { 2661 return self.focus; 2662 } 2663 2664 fn applySgr(style: *Grid.Style, params: []const u8) void { 2665 var nums: [16]u32 = undefined; 2666 var n: usize = 0; 2667 var it = std.mem.splitScalar(u8, params, ';'); 2668 while (it.next()) |tok| { 2669 if (n >= nums.len) break; 2670 // an empty parameter (e.g. bare "\x1b[m") means 0 2671 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 2672 n += 1; 2673 } 2674 if (n == 0) { 2675 style.* = .{}; 2676 return; 2677 } 2678 var i: usize = 0; 2679 while (i < n) : (i += 1) { 2680 switch (nums[i]) { 2681 0 => style.* = .{}, 2682 7 => style.inverted = true, 2683 27 => style.inverted = false, 2684 39 => style.fg = null, 2685 49 => style.bg = null, 2686 38, 48 => { 2687 // truecolor form: 38;2;r;g;b — anything else is ignored 2688 if (i + 4 < n and nums[i + 1] == 2) { 2689 const c = Grid.Color{ 2690 .r = @truncate(nums[i + 2]), 2691 .g = @truncate(nums[i + 3]), 2692 .b = @truncate(nums[i + 4]), 2693 }; 2694 if (nums[i] == 38) style.fg = c else style.bg = c; 2695 i += 4; 2696 } 2697 }, 2698 else => {}, 2699 } 2700 } 2701 } 2702 }; 2703 2704 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 2705 pub const AnsiBackground = struct { 2706 grid: ?Grid, 2707 child: *Widget, 2708 art: AnsiArt, 2709 session: *Session, 2710 2711 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, art_content: []const u8, session: *Session) !AnsiBackground { 2712 var cw = child_widget; 2713 const child = allocator.create(Widget) catch |e| { 2714 cw.deinit(allocator); 2715 return e; 2716 }; 2717 child.* = cw; 2718 errdefer { 2719 child.deinit(allocator); 2720 allocator.destroy(child); 2721 } 2722 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, art_content), .session = session }; 2723 } 2724 2725 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 2726 if (self.grid) |*grid| grid.deinit(); 2727 self.art.deinit(allocator); 2728 self.child.deinit(allocator); 2729 allocator.destroy(self.child); 2730 } 2731 2732 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2733 self.clearGrid(); 2734 2735 // make the wrapped page fill the whole available area 2736 try self.child.build(allocator, .{ 2737 .min_size = .{ 2738 .width = constraint.max_size.width orelse constraint.min_size.width, 2739 .height = constraint.max_size.height orelse constraint.min_size.height, 2740 }, 2741 .max_size = constraint.max_size, 2742 }, root_focus); 2743 2744 if (self.session.data.enable_ansi) { 2745 if (self.child.getGrid()) |fg| { 2746 self.grid = try artBehind(allocator, fg, &self.art, .top_right, self.session.is_terminal, root_focus); 2747 } 2748 } 2749 } 2750 2751 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2752 try self.child.input(allocator, key, root_focus); 2753 } 2754 2755 pub fn clearGrid(self: *AnsiBackground) void { 2756 if (self.grid) |*grid| { 2757 grid.deinit(); 2758 self.grid = null; 2759 } 2760 self.child.clearGrid(); 2761 self.art.clearGrid(); 2762 } 2763 2764 pub fn getGrid(self: AnsiBackground) ?Grid { 2765 return self.grid orelse self.child.getGrid(); 2766 } 2767 2768 pub fn getFocus(self: *AnsiBackground) *Focus { 2769 return self.child.getFocus(); 2770 } 2771 2772 // which top corner the art hugs. 2773 const ArtAnchor = enum { top_left, top_right }; 2774 2775 // a foreground cell counts as blank if it's empty or a bare space without styling 2776 fn cellIsBlank(cell: Grid.Cell) bool { 2777 if (cell.rune) |rune| { 2778 return std.mem.eql(u8, rune, " ") and 2779 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 2780 } 2781 return true; 2782 } 2783 2784 // the art is dimmed to this fraction of its brightness so foreground text 2785 // stays legible over it 2786 const art_brightness = 45; // percent 2787 2788 fn dimColor(color: ?Grid.Color) ?Grid.Color { 2789 const c = color orelse return null; 2790 return .{ 2791 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 2792 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 2793 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 2794 }; 2795 } 2796 2797 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 2798 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 2799 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 2800 // snap such channels clear of that range so the backdrop doesn't blink or 2801 // hide text there; the ≤9/255 shift is imperceptible on terminals that 2802 // actually render truecolor. 2803 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 2804 const c = color orelse return null; 2805 const snap = struct { 2806 fn f(v: u8) u8 { 2807 return if (v >= 1 and v <= 9) 10 else v; 2808 } 2809 }.f; 2810 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 2811 } 2812 2813 // composites ANSI art behind a foreground grid 2814 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art: *AnsiArt, anchor: ArtAnchor, is_terminal: bool, root_focus: *Focus) !Grid { 2815 art.clearGrid(); 2816 try art.build(allocator, .{ 2817 .min_size = .{ .width = null, .height = null }, 2818 .max_size = .{ .width = foreground.size.width, .height = foreground.size.height }, 2819 }, root_focus); 2820 2821 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 2822 errdefer out.deinit(); 2823 2824 if (art.getGrid()) |art_grid| { 2825 const anchor_x = switch (anchor) { 2826 .top_left => 0, 2827 .top_right => foreground.size.width -| art_grid.size.width, 2828 }; 2829 for (0..art_grid.size.height) |y| { 2830 for (0..art_grid.size.width) |x| { 2831 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 2832 if (src.rune == null) continue; 2833 const idx = out.cells.at(.{ y, anchor_x + x }) catch continue; 2834 const dst = &out.cells.items[idx]; 2835 // composite the dimmed art behind every cell so it shows 2836 // through the whole UI: a blank cell becomes the art, while a 2837 // cell with a glyph keeps the glyph but takes the dimmed art as 2838 // its background (replacing whatever background it had, which 2839 // would otherwise obscure the art). 2840 if (cellIsBlank(dst.*)) { 2841 dst.* = src; 2842 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 2843 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 2844 } else { 2845 const background_maybe = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 2846 dst.style.bg = background_maybe; 2847 // change the color of text overlaying ANSI art to ensure 2848 // it is readable. don't do this in the web UI, since we 2849 // have direct control of the theme there (also, inner 2850 // scroll panes allow text to move without a re-render 2851 // by the TUI, which would break this). also don't do this 2852 // if the text is explicitly styled. 2853 if (is_terminal and dst.style.fg == null) { 2854 if (background_maybe) |background| { 2855 // use near-black and near-white, which is easier on the eyes 2856 // while retaining high contrast 2857 const luminance = (@as(u32, background.r) * 299 + 2858 @as(u32, background.g) * 587 + 2859 @as(u32, background.b) * 114) / 1000; 2860 dst.style.fg = if (luminance >= 128) 2861 .{ .r = 16, .g = 16, .b = 16 } 2862 else 2863 .{ .r = 240, .g = 240, .b = 240 }; 2864 } 2865 } 2866 } 2867 } 2868 } 2869 } 2870 return out; 2871 } 2872 }; 2873