╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭b430409b..╮ b430409b.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (203) 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
1493 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; 1494 if (width == 0 or height == 0) return; 1495 1496 const offset_x: usize = if (self.direction == .horiz or self.direction == .both) 1497 (width -| child_grid.size.width) / 2 1498 else 1499 0; 1500 const offset_y: usize = if (self.direction == .vert or self.direction == .both) 1501 (height -| child_grid.size.height) / 2 1502 else 1503 0; 1504 1505 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 1506 errdefer grid.deinit(); 1507 try grid.drawGrid(child_grid, offset_x, offset_y); 1508 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 1509 self.getFocus().child_id = self.child.getFocus().id; 1510 1511 self.grid = grid; 1512 } 1513 1514 pub fn input(self: *Center, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1515 try self.child.input(allocator, key, root_focus); 1516 } 1517 1518 pub fn clearGrid(self: *Center) void { 1519 if (self.grid) |*grid| { 1520 grid.deinit(); 1521 self.grid = null; 1522 } 1523 self.child.clearGrid(); 1524 } 1525 1526 pub fn getGrid(self: Center) ?Grid { 1527 return self.grid; 1528 } 1529 1530 pub fn getFocus(self: *Center) *Focus { 1531 return self.focus; 1532 } 1533 }; 1534 1535 // renders truecolor ANSI art 1536 pub const AnsiArt = struct { 1537 focus: *Focus, 1538 grid: ?Grid, 1539 content: []const u8, 1540 1541 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 1542 return .{ 1543 .focus = try Focus.create(allocator, .container), 1544 .grid = null, 1545 .content = content, 1546 }; 1547 } 1548 1549 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 1550 self.focus.destroy(allocator); 1551 if (self.grid) |*grid| { 1552 grid.deinit(); 1553 self.grid = null; 1554 } 1555 } 1556 1557 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1558 _ = root_focus; 1559 self.clearGrid(); 1560 1561 // parse into rows of cells, then copy into a rectangular grid 1562 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 1563 defer { 1564 for (rows.items) |*row| row.deinit(allocator); 1565 rows.deinit(allocator); 1566 } 1567 var row: std.ArrayList(Grid.Cell) = .empty; 1568 errdefer row.deinit(allocator); 1569 1570 var style: Grid.Style = .{}; 1571 var width: usize = 0; 1572 const content = self.content; 1573 var i: usize = 0; 1574 while (i < content.len) { 1575 const byte = content[i]; 1576 if (byte == '\n') { 1577 width = @max(width, row.items.len); 1578 try rows.append(allocator, row); 1579 row = .empty; 1580 i += 1; 1581 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 1582 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 1583 var j = i + 2; 1584 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 1585 if (j >= content.len) { 1586 i = content.len; // malformed trailing escape; stop 1587 } else { 1588 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 1589 i = j + 1; 1590 } 1591 } else { 1592 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 1593 const end = @min(content.len, i + len); 1594 const rune = content[i..end]; 1595 const transparent = end - i == 1 and rune[0] == ' ' and 1596 style.fg == null and style.bg == null and !style.inverted; 1597 try row.append(allocator, .{ 1598 .rune = if (transparent) null else rune, 1599 .style = style, 1600 }); 1601 i = end; 1602 } 1603 } 1604 // a trailing row with content but no closing newline 1605 if (row.items.len > 0) { 1606 width = @max(width, row.items.len); 1607 try rows.append(allocator, row); 1608 } else { 1609 row.deinit(allocator); 1610 } 1611 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 1612 1613 const height = rows.items.len; 1614 if (width == 0 or height == 0) return; 1615 1616 const clamped_w = @min(width, constraint.max_size.width orelse width); 1617 const clamped_h = @min(height, constraint.max_size.height orelse height); 1618 1619 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 1620 errdefer grid.deinit(); 1621 for (rows.items[0..clamped_h], 0..) |r, y| { 1622 const n = @min(r.items.len, clamped_w); 1623 for (r.items[0..n], 0..) |cell, x| { 1624 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 1625 } 1626 } 1627 self.grid = grid; 1628 } 1629 1630 pub fn input(self: *AnsiArt, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1631 _ = self; 1632 _ = allocator; 1633 _ = key; 1634 _ = root_focus; 1635 } 1636 1637 pub fn clearGrid(self: *AnsiArt) void { 1638 if (self.grid) |*grid| { 1639 grid.deinit(); 1640 self.grid = null; 1641 } 1642 } 1643 1644 pub fn getGrid(self: AnsiArt) ?Grid { 1645 return self.grid; 1646 } 1647 1648 pub fn getFocus(self: *AnsiArt) *Focus { 1649 return self.focus; 1650 } 1651 1652 fn applySgr(style: *Grid.Style, params: []const u8) void { 1653 var nums: [16]u32 = undefined; 1654 var n: usize = 0; 1655 var it = std.mem.splitScalar(u8, params, ';'); 1656 while (it.next()) |tok| { 1657 if (n >= nums.len) break; 1658 // an empty parameter (e.g. bare "\x1b[m") means 0 1659 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 1660 n += 1; 1661 } 1662 if (n == 0) { 1663 style.* = .{}; 1664 return; 1665 } 1666 var i: usize = 0; 1667 while (i < n) : (i += 1) { 1668 switch (nums[i]) { 1669 0 => style.* = .{}, 1670 7 => style.inverted = true, 1671 27 => style.inverted = false, 1672 39 => style.fg = null, 1673 49 => style.bg = null, 1674 38, 48 => { 1675 // truecolor form: 38;2;r;g;b — anything else is ignored 1676 if (i + 4 < n and nums[i + 1] == 2) { 1677 const c = Grid.Color{ 1678 .r = @truncate(nums[i + 2]), 1679 .g = @truncate(nums[i + 3]), 1680 .b = @truncate(nums[i + 4]), 1681 }; 1682 if (nums[i] == 38) style.fg = c else style.bg = c; 1683 i += 4; 1684 } 1685 }, 1686 else => {}, 1687 } 1688 } 1689 } 1690 }; 1691 1692 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 1693 pub const AnsiBackground = struct { 1694 grid: ?Grid, 1695 child: *Widget, 1696 art: AnsiArt, 1697 session: *Session, 1698 1699 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, art_content: []const u8, session: *Session) !AnsiBackground { 1700 var cw = child_widget; 1701 const child = allocator.create(Widget) catch |e| { 1702 cw.deinit(allocator); 1703 return e; 1704 }; 1705 child.* = cw; 1706 errdefer { 1707 child.deinit(allocator); 1708 allocator.destroy(child); 1709 } 1710 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, art_content), .session = session }; 1711 } 1712 1713 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 1714 if (self.grid) |*grid| grid.deinit(); 1715 self.art.deinit(allocator); 1716 self.child.deinit(allocator); 1717 allocator.destroy(self.child); 1718 } 1719 1720 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 1721 self.clearGrid(); 1722 1723 // make the wrapped page fill the whole available area 1724 try self.child.build(allocator, .{ 1725 .min_size = .{ 1726 .width = constraint.max_size.width orelse constraint.min_size.width, 1727 .height = constraint.max_size.height orelse constraint.min_size.height, 1728 }, 1729 .max_size = constraint.max_size, 1730 }, root_focus); 1731 1732 if (self.session.data.enable_ansi) { 1733 if (self.child.getGrid()) |fg| { 1734 self.grid = try artBehind(allocator, fg, &self.art, .top_right, root_focus); 1735 } 1736 } 1737 } 1738 1739 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: inp.Key, root_focus: *Focus) !void { 1740 try self.child.input(allocator, key, root_focus); 1741 } 1742 1743 pub fn clearGrid(self: *AnsiBackground) void { 1744 if (self.grid) |*grid| { 1745 grid.deinit(); 1746 self.grid = null; 1747 } 1748 self.child.clearGrid(); 1749 self.art.clearGrid(); 1750 } 1751 1752 pub fn getGrid(self: AnsiBackground) ?Grid { 1753 return self.grid orelse self.child.getGrid(); 1754 } 1755 1756 pub fn getFocus(self: *AnsiBackground) *Focus { 1757 return self.child.getFocus(); 1758 } 1759 1760 // which top corner the art hugs. 1761 const ArtAnchor = enum { top_left, top_right }; 1762 1763 // a foreground cell counts as blank if it's empty or a bare space without styling 1764 fn cellIsBlank(cell: Grid.Cell) bool { 1765 if (cell.rune) |rune| { 1766 return std.mem.eql(u8, rune, " ") and 1767 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 1768 } 1769 return true; 1770 } 1771 1772 // the art is dimmed to this fraction of its brightness so foreground text 1773 // stays legible over it 1774 const art_brightness = 45; // percent 1775 1776 fn dimColor(color: ?Grid.Color) ?Grid.Color { 1777 const c = color orelse return null; 1778 return .{ 1779 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 1780 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 1781 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 1782 }; 1783 } 1784 1785 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 1786 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 1787 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 1788 // snap such channels clear of that range so the backdrop doesn't blink or 1789 // hide text there; the ≤9/255 shift is imperceptible on terminals that 1790 // actually render truecolor. 1791 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 1792 const c = color orelse return null; 1793 const snap = struct { 1794 fn f(v: u8) u8 { 1795 return if (v >= 1 and v <= 9) 10 else v; 1796 } 1797 }.f; 1798 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 1799 } 1800 1801 // composites ANSI art behind a foreground grid 1802 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art: *AnsiArt, anchor: ArtAnchor, root_focus: *Focus) !Grid { 1803 art.clearGrid(); 1804 try art.build(allocator, .{ 1805 .min_size = .{ .width = null, .height = null }, 1806 .max_size = .{ .width = foreground.size.width, .height = foreground.size.height }, 1807 }, root_focus); 1808 1809 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 1810 errdefer out.deinit(); 1811 1812 if (art.getGrid()) |art_grid| { 1813 const anchor_x = switch (anchor) { 1814 .top_left => 0, 1815 .top_right => foreground.size.width -| art_grid.size.width, 1816 }; 1817 for (0..art_grid.size.height) |y| { 1818 for (0..art_grid.size.width) |x| { 1819 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 1820 if (src.rune == null) continue; 1821 const idx = out.cells.at(.{ y, anchor_x + x }) catch continue; 1822 const dst = &out.cells.items[idx]; 1823 // composite the dimmed art behind every cell so it shows 1824 // through the whole UI: a blank cell becomes the art, while a 1825 // cell with a glyph keeps the glyph but takes the dimmed art as 1826 // its background (replacing whatever background it had, which 1827 // would otherwise obscure the art). 1828 if (cellIsBlank(dst.*)) { 1829 dst.* = src; 1830 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 1831 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 1832 } else { 1833 dst.style.bg = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 1834 } 1835 } 1836 } 1837 } 1838 return out; 1839 } 1840 }; 1841