╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭894344e5..╮ 894344e5.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (423) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig fork.zig lib.zig main.zig main_wasm.zig patch.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
2623 grid.deinit(); 2624 self.grid = null; 2625 } 2626 } 2627 2628 pub fn build(self: *Spacer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2629 _ = root_focus; 2630 self.clearGrid(); 2631 const width = constraint.max_size.width orelse return; 2632 if (width == 0) return; 2633 self.grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2634 } 2635 2636 pub fn input(self: *Spacer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2637 _ = self; 2638 _ = allocator; 2639 _ = key; 2640 _ = root_focus; 2641 } 2642 2643 pub fn clearGrid(self: *Spacer) void { 2644 if (self.grid) |*grid| { 2645 grid.deinit(); 2646 self.grid = null; 2647 } 2648 } 2649 2650 pub fn getGrid(self: Spacer) ?Grid { 2651 return self.grid; 2652 } 2653 2654 pub fn getFocus(self: *Spacer) *Focus { 2655 return self.focus; 2656 } 2657 }; 2658 2659 // a one-row, non-focusable status bar showing the current page's url 2660 pub const Footer = struct { 2661 focus: *Focus, 2662 grid: ?Grid, 2663 session: *Session, 2664 arena: std.heap.ArenaAllocator, 2665 url: []const u8 = "", 2666 url_width: usize = 0, 2667 2668 pub fn init(allocator: std.mem.Allocator, session: *Session) !Footer { 2669 return .{ 2670 .focus = try Focus.create(allocator, .container), 2671 .grid = null, 2672 .session = session, 2673 .arena = std.heap.ArenaAllocator.init(allocator), 2674 }; 2675 } 2676 2677 pub fn deinit(self: *Footer, allocator: std.mem.Allocator) void { 2678 self.focus.destroy(allocator); 2679 if (self.grid) |*grid| grid.deinit(); 2680 self.arena.deinit(); 2681 } 2682 2683 pub fn build(self: *Footer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2684 _ = root_focus; 2685 self.clearGrid(); 2686 const width = constraint.max_size.width orelse return; 2687 if (width == 0) return; 2688 2689 _ = self.arena.reset(.retain_capacity); 2690 self.url = ""; 2691 self.url_width = 0; 2692 const aa = self.arena.allocator(); 2693 const path = self.session.data.current_page.toUrl(&self.arena) catch return; 2694 const text = terminalWebUrl(aa, self.session, path) catch return; 2695 self.url = text; 2696 2697 var grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2698 errdefer grid.deinit(); 2699 var utf8 = (std.unicode.Utf8View.init(text) catch return).iterator(); 2700 var i: usize = 0; 2701 while (utf8.nextCodepointSlice()) |ch| { 2702 if (i == width) break; 2703 grid.cells.items[try grid.cells.at(.{ 0, i })].rune = ch; 2704 i += 1; 2705 } 2706 self.url_width = i; 2707 self.grid = grid; 2708 } 2709 2710 pub fn input(self: *Footer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2711 _ = allocator; 2712 switch (key) { 2713 .mouse => |mouse| { 2714 if (mouse.ctrl or !inp.leftClickOn(root_focus, self.getFocus().id, mouse)) return; 2715 const rect = (root_focus.children.get(self.getFocus().id) orelse return).rect; 2716 if (mouse.x < rect.x + self.url_width) self.session.host_request = .{ .show_copyable_text = self.url }; 2717 }, 2718 else => {}, 2719 } 2720 } 2721 2722 pub fn clearGrid(self: *Footer) void { 2723 if (self.grid) |*grid| { 2724 grid.deinit(); 2725 self.grid = null; 2726 } 2727 } 2728 2729 pub fn getGrid(self: Footer) ?Grid { 2730 return self.grid; 2731 } 2732 2733 pub fn getFocus(self: *Footer) *Focus { 2734 return self.focus; 2735 } 2736 }; 2737 2738 // a single-child wrapper that builds the child at its natural size and 2739 // positions its grid in the middle of the area granted by the parent 2740 // a bordered label, indented past the content it precedes 2741 pub const SectionLabel = struct { 2742 box: wgt.Box(Widget), 2743 2744 pub fn init(allocator: std.mem.Allocator, content: []const u8) !SectionLabel { 2745 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2746 errdefer box.deinit(allocator); 2747 2748 { 2749 var gap = try wgt.Text(Widget).init(allocator, " "); 2750 errdefer gap.deinit(allocator); 2751 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2752 } 2753 2754 { 2755 var tb = try wgt.TextBox(Widget).init(allocator, content, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2756 errdefer tb.deinit(allocator); 2757 tb.getFocus().focusable = true; 2758 try box.children.put(allocator, tb.getFocus().id, .{ .widget = .{ .text_box = tb }, .rect = null, .min_size = null }); 2759 } 2760 2761 box.getFocus().child_id = box.children.keys()[1]; 2762 return .{ .box = box }; 2763 } 2764 2765 pub fn deinit(self: *SectionLabel, allocator: std.mem.Allocator) void { 2766 self.box.deinit(allocator); 2767 } 2768 2769 pub fn build(self: *SectionLabel, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2770 try self.box.build(allocator, constraint, root_focus); 2771 } 2772 2773 pub fn input(self: *SectionLabel, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2774 _ = self; 2775 _ = allocator; 2776 _ = key; 2777 _ = root_focus; 2778 } 2779 2780 pub fn clearGrid(self: *SectionLabel) void { 2781 self.box.clearGrid(); 2782 } 2783 2784 pub fn getGrid(self: SectionLabel) ?Grid { 2785 return self.box.getGrid(); 2786 } 2787 2788 pub fn getFocus(self: *SectionLabel) *Focus { 2789 return self.box.getFocus(); 2790 } 2791 }; 2792 2793 // a submit button, indented past its form's content. the web overlay POSTs 2794 // the button's form; terminal hosts detect presses through `buttonId`. 2795 pub const SubmitButton = struct { 2796 box: wgt.Box(Widget), 2797 2798 pub fn init(allocator: std.mem.Allocator) !SubmitButton { 2799 return initLabeled(allocator, "submit"); 2800 } 2801 2802 pub fn initLabeled(allocator: std.mem.Allocator, label: []const u8) !SubmitButton { 2803 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2804 errdefer box.deinit(allocator); 2805 2806 { 2807 var gap = try wgt.Text(Widget).init(allocator, " "); 2808 errdefer gap.deinit(allocator); 2809 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2810 } 2811 2812 { 2813 var button = try wgt.TextBox(Widget).init(allocator, label, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2814 errdefer button.deinit(allocator); 2815 button.getFocus().focusable = true; 2816 // the renderer distinguishes plain clickables from buttons that 2817 // should POST to a server route by this kind. 2818 button.getFocus().kind = .{ .custom = "submit" }; 2819 try box.children.put(allocator, button.getFocus().id, .{ .widget = .{ .text_box = button }, .rect = null, .min_size = .{ .width = label.len + 2, .height = null } }); 2820 } 2821 2822 box.getFocus().child_id = box.children.keys()[1]; 2823 return .{ .box = box }; 2824 } 2825 2826 pub fn deinit(self: *SubmitButton, allocator: std.mem.Allocator) void { 2827 self.box.deinit(allocator); 2828 } 2829 2830 pub fn build(self: *SubmitButton, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2831 try self.box.build(allocator, constraint, root_focus); 2832 } 2833 2834 pub fn input(self: *SubmitButton, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2835 _ = self; 2836 _ = allocator; 2837 _ = key; 2838 _ = root_focus; 2839 } 2840 2841 pub fn clearGrid(self: *SubmitButton) void { 2842 self.box.clearGrid(); 2843 } 2844 2845 pub fn getGrid(self: SubmitButton) ?Grid { 2846 return self.box.getGrid(); 2847 } 2848 2849 pub fn getFocus(self: *SubmitButton) *Focus { 2850 return self.box.getFocus(); 2851 } 2852 2853 // the button's focus id, for click hit-testing 2854 pub fn buttonId(self: *const SubmitButton) usize { 2855 return self.box.children.keys()[1]; 2856 } 2857 }; 2858 2859 pub const Center = struct { 2860 focus: *Focus, 2861 grid: ?Grid, 2862 child: *Widget, 2863 2864 pub fn init(allocator: std.mem.Allocator, child_widget: Widget) !Center { 2865 const child = try allocator.create(Widget); 2866 errdefer allocator.destroy(child); 2867 child.* = child_widget; 2868 return .{ 2869 .focus = try Focus.create(allocator, .container), 2870 .grid = null, 2871 .child = child, 2872 }; 2873 } 2874 2875 pub fn deinit(self: *Center, allocator: std.mem.Allocator) void { 2876 self.focus.destroy(allocator); 2877 if (self.grid) |*grid| { 2878 grid.deinit(); 2879 self.grid = null; 2880 } 2881 self.child.deinit(allocator); 2882 allocator.destroy(self.child); 2883 } 2884 2885 pub fn build(self: *Center, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2886 self.clearGrid(); 2887 self.getFocus().clear(); 2888 2889 // build the child without forcing it to fill min_size; it sizes 2890 // itself to its content within the available max. 2891 try self.child.build(allocator, .{ 2892 .min_size = .{ .width = null, .height = null }, 2893 .max_size = constraint.max_size, 2894 }, root_focus); 2895 2896 const child_grid = self.child.getGrid() orelse return; 2897 2898 // prefer max when given; otherwise grow to max(min, child) so that 2899 // when only a min is set (e.g. the wasm path passes viewport rows 2900 // as min_height with no max), we can still vertically center while 2901 // letting taller content extend past the min. 2902 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; 2903 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; 2904 if (width == 0 or height == 0) return; 2905 2906 const offset_x: usize = (width -| child_grid.size.width) / 2; 2907 const offset_y: usize = (height -| child_grid.size.height) / 2; 2908 2909 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 2910 errdefer grid.deinit(); 2911 try grid.drawGrid(child_grid, offset_x, offset_y); 2912 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 2913 self.getFocus().child_id = self.child.getFocus().id; 2914 2915 self.grid = grid; 2916 } 2917 2918 pub fn input(self: *Center, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2919 try self.child.input(allocator, key, root_focus); 2920 } 2921 2922 pub fn clearGrid(self: *Center) void { 2923 if (self.grid) |*grid| { 2924 grid.deinit(); 2925 self.grid = null; 2926 } 2927 self.child.clearGrid(); 2928 } 2929 2930 pub fn getGrid(self: Center) ?Grid { 2931 return self.grid; 2932 } 2933 2934 pub fn getFocus(self: *Center) *Focus { 2935 return self.focus; 2936 } 2937 }; 2938 2939 // renders truecolor ANSI art 2940 pub const AnsiArt = struct { 2941 focus: *Focus, 2942 grid: ?Grid, 2943 content: []const u8, 2944 2945 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 2946 return .{ 2947 .focus = try Focus.create(allocator, .container), 2948 .grid = null, 2949 .content = content, 2950 }; 2951 } 2952 2953 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 2954 self.focus.destroy(allocator); 2955 if (self.grid) |*grid| { 2956 grid.deinit(); 2957 self.grid = null; 2958 } 2959 } 2960 2961 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2962 _ = root_focus; 2963 self.clearGrid(); 2964 2965 // parse into rows of cells, then copy into a rectangular grid 2966 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 2967 defer { 2968 for (rows.items) |*row| row.deinit(allocator); 2969 rows.deinit(allocator); 2970 } 2971 var row: std.ArrayList(Grid.Cell) = .empty; 2972 errdefer row.deinit(allocator); 2973 2974 var style: Grid.Style = .{}; 2975 var width: usize = 0; 2976 const content = self.content; 2977 var i: usize = 0; 2978 while (i < content.len) { 2979 const byte = content[i]; 2980 if (byte == '\n') { 2981 width = @max(width, row.items.len); 2982 try rows.append(allocator, row); 2983 row = .empty; 2984 i += 1; 2985 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 2986 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 2987 var j = i + 2; 2988 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 2989 if (j >= content.len) { 2990 i = content.len; // malformed trailing escape; stop 2991 } else { 2992 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 2993 i = j + 1; 2994 } 2995 } else { 2996 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 2997 const end = @min(content.len, i + len); 2998 const rune = content[i..end]; 2999 // a foreground color does not make a space visible. only an 3000 // effective background makes it opaque; foreground state often 3001 // remains active through the padding at the end of a row. 3002 const effective_background = if (style.inverted) style.fg else style.bg; 3003 const transparent = end - i == 1 and rune[0] == ' ' and effective_background == null; 3004 try row.append(allocator, .{ 3005 .rune = if (transparent) null else rune, 3006 .style = style, 3007 }); 3008 i = end; 3009 } 3010 } 3011 // a trailing row with content but no closing newline 3012 if (row.items.len > 0) { 3013 width = @max(width, row.items.len); 3014 try rows.append(allocator, row); 3015 } else { 3016 row.deinit(allocator); 3017 } 3018 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 3019 3020 const height = rows.items.len; 3021 if (width == 0 or height == 0) return; 3022 3023 const clamped_w = @min(width, constraint.max_size.width orelse width); 3024 const clamped_h = @min(height, constraint.max_size.height orelse height); 3025 3026 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 3027 errdefer grid.deinit(); 3028 for (rows.items[0..clamped_h], 0..) |r, y| { 3029 const n = @min(r.items.len, clamped_w); 3030 for (r.items[0..n], 0..) |cell, x| { 3031 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 3032 } 3033 } 3034 self.grid = grid; 3035 } 3036 3037 pub fn clearGrid(self: *AnsiArt) void { 3038 if (self.grid) |*grid| { 3039 grid.deinit(); 3040 self.grid = null; 3041 } 3042 } 3043 3044 pub fn getGrid(self: AnsiArt) ?Grid { 3045 return self.grid; 3046 } 3047 3048 pub fn getFocus(self: *AnsiArt) *Focus { 3049 return self.focus; 3050 } 3051 3052 fn applySgr(style: *Grid.Style, params: []const u8) void { 3053 var nums: [16]u32 = undefined; 3054 var n: usize = 0; 3055 var it = std.mem.splitScalar(u8, params, ';'); 3056 while (it.next()) |tok| { 3057 if (n >= nums.len) break; 3058 // an empty parameter (e.g. bare "\x1b[m") means 0 3059 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 3060 n += 1; 3061 } 3062 if (n == 0) { 3063 style.* = .{}; 3064 return; 3065 } 3066 var i: usize = 0; 3067 while (i < n) : (i += 1) { 3068 switch (nums[i]) { 3069 0 => style.* = .{}, 3070 7 => style.inverted = true, 3071 27 => style.inverted = false, 3072 39 => style.fg = null, 3073 49 => style.bg = null, 3074 38, 48 => { 3075 // truecolor form: 38;2;r;g;b — anything else is ignored 3076 if (i + 4 < n and nums[i + 1] == 2) { 3077 const c = Grid.Color{ 3078 .r = @truncate(nums[i + 2]), 3079 .g = @truncate(nums[i + 3]), 3080 .b = @truncate(nums[i + 4]), 3081 }; 3082 if (nums[i] == 38) style.fg = c else style.bg = c; 3083 i += 4; 3084 } 3085 }, 3086 else => {}, 3087 } 3088 } 3089 } 3090 }; 3091 3092 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 3093 pub const AnsiBackground = struct { 3094 grid: ?Grid, 3095 child: *Widget, 3096 art: AnsiArt, 3097 session: *Session, 3098 3099 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, session: *Session) !AnsiBackground { 3100 var cw = child_widget; 3101 const child = allocator.create(Widget) catch |e| { 3102 cw.deinit(allocator); 3103 return e; 3104 }; 3105 child.* = cw; 3106 errdefer { 3107 child.deinit(allocator); 3108 allocator.destroy(child); 3109 } 3110 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, session.data.ansi_art), .session = session }; 3111 } 3112 3113 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 3114 if (self.grid) |*grid| grid.deinit(); 3115 self.art.deinit(allocator); 3116 self.child.deinit(allocator); 3117 allocator.destroy(self.child); 3118 } 3119 3120 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 3121 self.clearGrid(); 3122 3123 // make the wrapped page fill the whole available area 3124 try self.child.build(allocator, .{ 3125 .min_size = .{ 3126 .width = constraint.max_size.width orelse constraint.min_size.width, 3127 .height = constraint.max_size.height orelse constraint.min_size.height, 3128 }, 3129 .max_size = constraint.max_size, 3130 }, root_focus); 3131 3132 if (!self.session.data.enable_ansi) return; 3133 const foreground = self.child.getGrid() orelse return; 3134 self.art.content = self.session.data.ansi_art; 3135 try self.buildArt(allocator, foreground.size, root_focus); 3136 if (!self.session.is_terminal) return; 3137 const art_grid = self.art.getGrid() orelse return; 3138 self.grid = try artBehind(allocator, foreground, art_grid); 3139 } 3140 3141 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 3142 try self.child.input(allocator, key, root_focus); 3143 } 3144 3145 pub fn clearGrid(self: *AnsiBackground) void { 3146 if (self.grid) |*grid| { 3147 grid.deinit(); 3148 self.grid = null; 3149 } 3150 self.child.clearGrid(); 3151 self.art.clearGrid(); 3152 } 3153 3154 pub fn getGrid(self: AnsiBackground) ?Grid { 3155 return self.grid orelse self.child.getGrid(); 3156 } 3157 3158 pub fn getFocus(self: *AnsiBackground) *Focus { 3159 return self.child.getFocus(); 3160 } 3161 3162 // a foreground cell counts as blank if it's empty or a bare space without styling 3163 fn cellIsBlank(cell: Grid.Cell) bool { 3164 if (cell.rune) |rune| { 3165 return std.mem.eql(u8, rune, " ") and 3166 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 3167 } 3168 return true; 3169 } 3170 3171 // the art is dimmed to this fraction of its brightness so foreground text 3172 // stays legible over it 3173 const art_brightness = 35; // percent 3174 3175 fn dimColor(color: ?Grid.Color) ?Grid.Color { 3176 const c = color orelse return null; 3177 return .{ 3178 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 3179 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 3180 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 3181 }; 3182 } 3183 3184 fn buildArt(self: *AnsiBackground, allocator: std.mem.Allocator, size: layout.Size, root_focus: *Focus) !void { 3185 try self.art.build(allocator, .{ 3186 .min_size = .{ .width = null, .height = null }, 3187 .max_size = .{ .width = size.width, .height = size.height }, 3188 }, root_focus); 3189 if (self.art.grid) |*grid| { 3190 for (grid.cells.items) |*cell| { 3191 cell.style.fg = dimColor(cell.style.fg); 3192 cell.style.bg = dimColor(cell.style.bg); 3193 } 3194 } 3195 } 3196 3197 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 3198 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 3199 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 3200 // snap such channels clear of that range so the backdrop doesn't blink or 3201 // hide text there; the ≤9/255 shift is imperceptible on terminals that 3202 // actually render truecolor. 3203 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 3204 const c = color orelse return null; 3205 const snap = struct { 3206 fn f(v: u8) u8 { 3207 return if (v >= 1 and v <= 9) 10 else v; 3208 } 3209 }.f; 3210 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 3211 } 3212 3213 // composites ANSI art behind a foreground grid 3214 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art_grid: Grid) !Grid { 3215 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 3216 errdefer out.deinit(); 3217 3218 const anchor_x = foreground.size.width -| art_grid.size.width; 3219 for (0..art_grid.size.height) |y| { 3220 for (0..art_grid.size.width) |x| { 3221 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 3222 if (src.rune == null) continue; 3223 const idx = try out.cells.at(.{ y, anchor_x + x }); 3224 const dst = &out.cells.items[idx]; 3225 // blank cells take the art; occupied cells take its background 3226 if (cellIsBlank(dst.*)) { 3227 dst.* = src; 3228 dst.style.fg = sgrSafe(dst.style.fg); 3229 dst.style.bg = sgrSafe(dst.style.bg); 3230 } else { 3231 const background_maybe = sgrSafe(src.style.bg orelse src.style.fg); 3232 dst.style.bg = background_maybe; 3233 // change unstyled text to contrast with the art behind it 3234 if (dst.style.fg == null) { 3235 if (background_maybe) |background| { 3236 // use near-black and near-white, which is easier on the eyes 3237 // while retaining high contrast 3238 const luminance = (@as(u32, background.r) * 299 + 3239 @as(u32, background.g) * 587 + 3240 @as(u32, background.b) * 114) / 1000; 3241 dst.style.fg = if (luminance >= 128) 3242 .{ .r = 16, .g = 16, .b = 16 } 3243 else 3244 .{ .r = 240, .g = 240, .b = 240 }; 3245 } 3246 } 3247 } 3248 } 3249 } 3250 return out; 3251 } 3252 }; 3253