╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭7690bfb7..╮ 7690bfb7.. haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (689) user
╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig find.zig fork.zig lib.zig main.zig main_wasm.zig markdown.zig notify.zig patch.zig progress.zig push.zig search.zig search_commit.zig search_thread.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 │ ╰─────────────────────────────────╯
2413 var direct: std.ArrayList(usize) = .empty; 2414 defer direct.deinit(allocator); 2415 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2416 defer excluded.deinit(allocator); 2417 { 2418 var it = focus.children.iterator(); 2419 while (it.next()) |e| { 2420 if (e.value_ptr.focus.scroll == null) continue; 2421 try direct.append(allocator, e.key_ptr.*); 2422 try excluded.put(allocator, e.key_ptr.*, {}); 2423 var mit = e.value_ptr.focus.children.iterator(); 2424 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2425 } 2426 } 2427 2428 // the HTML element a run of cells is wrapped in, chosen from the cell's 2429 // focusable kind 2430 const CellTag = union(enum) { 2431 span, // clickable focusable cell 2432 a: []const u8, // clickable focusable link 2433 plain, // non-focusable, colored 2434 2435 const a_prefix = "a:"; 2436 // an "in-page" anchor: rendered as a real <a href> so it works with js 2437 // disabled, but wasm handles it without navigating. 2438 fn init(str: []const u8) @This() { 2439 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2440 return .{ .a = str[ui.raw_link_prefix.len..] }; 2441 } 2442 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2443 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2444 } 2445 if (std.mem.startsWith(u8, str, a_prefix)) { 2446 return .{ .a = str[a_prefix.len..] }; 2447 } 2448 return .span; 2449 } 2450 2451 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2452 var id_buf: [32]u8 = undefined; 2453 switch (self) { 2454 .span => { 2455 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2456 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2457 try out.appendSlice(alloc, "\""); 2458 try out.appendSlice(alloc, style_attr); 2459 try out.appendSlice(alloc, ">"); 2460 }, 2461 .a => |href| { 2462 // tabindex=-1 keeps these out of the browser's tab order 2463 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2464 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2465 try out.appendSlice(alloc, "\" href=\""); 2466 try appendEscapedHtml(alloc, out, href); 2467 try out.appendSlice(alloc, "\""); 2468 try out.appendSlice(alloc, style_attr); 2469 try out.appendSlice(alloc, ">"); 2470 }, 2471 .plain => { 2472 try out.appendSlice(alloc, "<span"); 2473 try out.appendSlice(alloc, style_attr); 2474 try out.appendSlice(alloc, ">"); 2475 }, 2476 } 2477 } 2478 2479 fn closeTag(self: @This()) []const u8 { 2480 return switch (self) { 2481 .span, .plain => "</span>", 2482 .a => "</a>", 2483 }; 2484 } 2485 }; 2486 2487 // the focusable owning each cell, among this panel's own (skipping any 2488 // that belong to a child scroll, whose cells are drawn in their own panel). 2489 // claimed in focus order, so the first focusable over a cell keeps it. 2490 // looking every focusable up for every cell is quadratic in a long list. 2491 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2492 defer allocator.free(owners); 2493 @memset(owners, null); 2494 { 2495 var it = focus.children.iterator(); 2496 while (it.next()) |entry| { 2497 const child = entry.value_ptr.*; 2498 if (child.focus.mode != .all) continue; 2499 if (excluded.contains(entry.key_ptr.*)) continue; 2500 const r = child.rect; 2501 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2502 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2503 const owner = &owners[y * grid.size.width + x]; 2504 if (owner.* == null) owner.* = entry.key_ptr.*; 2505 } 2506 } 2507 } 2508 } 2509 2510 // the cells are the volatile part of a panel. js replaces this one subtree 2511 // wholesale while retaining the panel's native controls and scroll shells. 2512 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2513 2514 // emit this panel's grid as rows of text, coalescing adjacent cells that 2515 // share a focus id and style into one tag (a clickable span, a link, or a 2516 // plain styled span). cells under a child scroll keep only their background. 2517 // a cell's own link is an anchor nested in that tag. 2518 for (0..grid.size.height) |y| { 2519 var cur_id: ?usize = null; 2520 var cur_style: Grid.Style = .{}; 2521 var open_tag: ?CellTag = null; 2522 var open_link: ?[]const u8 = null; 2523 var first = true; 2524 for (0..grid.size.width) |x| { 2525 const cell = (try grid.cell(x, y)).*; 2526 // a cell covered by a child scroll's viewport is drawn by that scroll's 2527 // own div, so blank its glyph and make it non-clickable here — but keep 2528 // its background, so the backdrop still shows through the scroll's 2529 // transparent div instead of a bare hole. 2530 const covered_by_scroll = blk: { 2531 for (direct.items) |id| { 2532 const r = (focus.children.get(id) orelse continue).rect; 2533 if (x >= r.x and y >= r.y and x < r.x + r.size.width and y < r.y + r.size.height) break :blk true; 2534 } 2535 break :blk false; 2536 }; 2537 // the focusable owning the cell at (x, y); none for a covered cell. 2538 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2539 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2540 2541 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2542 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2543 open_link = null; 2544 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2545 2546 var new_tag: ?CellTag = null; 2547 if (cell_id) |id| { 2548 if (focus.children.get(id)) |child| { 2549 new_tag = switch (child.focus.kind) { 2550 .custom => |custom| CellTag.init(custom), 2551 else => .span, 2552 }; 2553 } 2554 } 2555 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2556 2557 if (new_tag) |t| { 2558 var style_buf: [192]u8 = undefined; 2559 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2560 } 2561 2562 open_tag = new_tag; 2563 cur_id = cell_id; 2564 cur_style = style; 2565 first = false; 2566 } 2567 2568 // an anchor can't nest in another, so a link tag's cells skip theirs 2569 const in_anchor = if (open_tag) |t| t == .a else false; 2570 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2571 if (!sameLink(link, open_link)) { 2572 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2573 if (link) |url| { 2574 // a page path opens in this tab, any other url in a new one 2575 try output.appendSlice(allocator, if (url[0] == '/') 2576 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2577 else 2578 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2579 try appendEscapedHtml(allocator, output, url); 2580 try output.appendSlice(allocator, "\">"); 2581 } 2582 open_link = link; 2583 } 2584 2585 if (covered_by_scroll) { 2586 try appendEscapedHtml(allocator, output, " "); 2587 } else if (cell.continuation) { 2588 // the wide rune to the left was emitted 2ch wide, covering this column 2589 } else if (cell.rune) |rune| { 2590 var encoded: [4]u8 = undefined; 2591 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2592 const rune_text = encoded[0..encoded_len]; 2593 // a double-width rune is pinned inside a 2ch span so the 2594 // fallback glyph's advance width can't shift the rest of the row 2595 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2596 if (wide) { 2597 try output.appendSlice(allocator, "<span class=\"w2\">"); 2598 try appendEscapedHtml(allocator, output, rune_text); 2599 try output.appendSlice(allocator, "</span>"); 2600 } else { 2601 try appendEscapedHtml(allocator, output, rune_text); 2602 } 2603 } else { 2604 try appendEscapedHtml(allocator, output, " "); 2605 } 2606 } 2607 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2608 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2609 try output.append(allocator, '\n'); 2610 } 2611 try output.appendSlice(allocator, "</div>"); 2612 2613 // native controls live in their panel, beside the replaceable cells. their 2614 // stable keys let JS update layout without recreating their DOM nodes, and 2615 // being actual descendants of a scroll gives them native movement/clipping. 2616 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2617 2618 // each child scroll becomes a natively-scrollable div positioned over its 2619 // viewport, holding its full content rendered recursively. 2620 for (direct.items) |id| { 2621 const child = focus.children.get(id) orelse continue; 2622 const info = child.focus.scroll orelse continue; 2623 const r = child.rect; 2624 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2625 // when that axis actually overflows. the other axis is clipped (hidden), 2626 // matching how the terminal Scroll handles its non-scrolling axis. 2627 const overflow = switch (info.direction) { 2628 .vert => "overflow-x:hidden;overflow-y:auto", 2629 .horiz => "overflow-x:auto;overflow-y:hidden", 2630 .both => "overflow:auto", 2631 }; 2632 // the id carries a content version so JS preserves the native scroll 2633 // position across re-renders of the same content but resets it when the 2634 // content is replaced — e.g. selecting a different commit. the widget's 2635 // scroll offset (in cells) rides along so JS can apply it when it has no 2636 // preserved position, letting a wasm-side scrollToRect (the files list 2637 // scrolling to its selected row on page load) reach the browser. 2638 var buf: [256]u8 = undefined; 2639 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, "<div class=\"scroll\" data-key=\"scroll:{d}\" data-scroll-id=\"{d}-{d}\" data-scroll-direction=\"{s}\" data-scroll-x=\"{d}\" data-scroll-y=\"{d}\" style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em;{s}\">", .{ id, id, child.focus.version, @tagName(info.direction), info.offset_x, info.offset_y, r.x, r.y, r.size.width, r.size.height, overflow })); 2640 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2641 try output.appendSlice(allocator, "</div>"); 2642 } 2643 } 2644 2645 const form_prefix = "form:"; 2646 const form_id_prefix = "haxy-form-"; 2647 2648 fn formAction(focus: *const Focus) ?[]const u8 { 2649 return switch (focus.kind) { 2650 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2651 else => null, 2652 }; 2653 } 2654 2655 // find the form ancestor of a flattened focus-tree child. html's `form` 2656 // attribute then associates the control with that form without requiring the 2657 // form and control to share a DOM parent. 2658 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2659 var id = focus_id; 2660 while (root_focus.children.get(id)) |child| { 2661 const parent_id = child.parent_id; 2662 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2663 const parent = root_focus.children.get(parent_id) orelse return null; 2664 if (formAction(parent.focus) != null) return parent_id; 2665 id = parent_id; 2666 } 2667 return null; 2668 } 2669 2670 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2671 const form_id = formOwner(root_focus, focus_id) orelse return; 2672 var buf: [64]u8 = undefined; 2673 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2674 } 2675 2676 fn renderPanelControls( 2677 allocator: std.mem.Allocator, 2678 output: *std.ArrayList(u8), 2679 focus: *Focus, 2680 session: *ui.Session, 2681 root_focus: *Focus, 2682 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2683 ) !void { 2684 var iter = focus.children.iterator(); 2685 while (iter.next()) |entry| { 2686 const id = entry.key_ptr.*; 2687 if (excluded.contains(id)) continue; 2688 const child = entry.value_ptr.*; 2689 const r = child.rect; 2690 2691 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2692 2693 switch (child.focus.kind) { 2694 .text_input, .text_input_password, .text_area => { 2695 const ti = session.text_inputs.get(id) orelse continue; 2696 2697 const inner_left = r.x + 1; 2698 const inner_top = r.y + 1; 2699 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2700 const preserve = !ti.options.read_only; 2701 2702 if (child.focus.kind == .text_area) { 2703 const value = try ti.text(allocator); 2704 defer allocator.free(value); 2705 var id_buf: [128]u8 = undefined; 2706 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2707 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2708 try appendFormAttribute(allocator, output, root_focus, id); 2709 if (ti.options.name.len > 0) { 2710 try output.appendSlice(allocator, " name=\""); 2711 try appendEscapedHtml(allocator, output, ti.options.name); 2712 try output.append(allocator, '"'); 2713 } 2714 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2715 var pos_buf: [128]u8 = undefined; 2716 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">\n", .{ inner_left, inner_top, inner_width, inner_height })); 2717 try appendEscapedHtml(allocator, output, value); 2718 try output.appendSlice(allocator, "</textarea>"); 2719 continue; 2720 } 2721 2722 var id_buf: [160]u8 = undefined; 2723 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"{s}\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ if (child.focus.kind == .text_input_password) "password" else "text", id, id })); 2724 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2725 try appendFormAttribute(allocator, output, root_focus, id); 2726 if (ti.options.name.len > 0) { 2727 try output.appendSlice(allocator, " name=\""); 2728 try appendEscapedHtml(allocator, output, ti.options.name); 2729 try output.append(allocator, '"'); 2730 } 2731 if (child.focus.kind != .text_input_password) { 2732 const value = try ti.text(allocator); 2733 defer allocator.free(value); 2734 try output.appendSlice(allocator, " value=\""); 2735 try appendEscapedHtml(allocator, output, value); 2736 try output.append(allocator, '"'); 2737 } 2738 var pos_buf: [96]u8 = undefined; 2739 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:1em\">", .{ inner_left, inner_top, inner_width })); 2740 }, 2741 .custom => |custom| { 2742 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2743 if (formOwner(root_focus, id) == null) continue; 2744 var id_buf: [128]u8 = undefined; 2745 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2746 try appendFormAttribute(allocator, output, root_focus, id); 2747 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2748 try output.appendSlice(allocator, " formaction=\""); 2749 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2750 try output.append(allocator, '"'); 2751 } 2752 var pos_buf: [128]u8 = undefined; 2753 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\"></button>", .{ r.x, r.y, r.size.width, r.size.height })); 2754 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2755 // an invisible native radio over the option, checked when the option is its row's selection 2756 const field = custom[ui.radio_prefix.len..]; 2757 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2758 const row = root_focus.children.get(child.parent_id) orelse continue; 2759 var id_buf: [128]u8 = undefined; 2760 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2761 try appendFormAttribute(allocator, output, root_focus, id); 2762 try output.appendSlice(allocator, " name=\""); 2763 try appendEscapedHtml(allocator, output, field[0..separator]); 2764 try output.appendSlice(allocator, "\" value=\""); 2765 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2766 try output.append(allocator, '"'); 2767 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2768 var pos_buf: [128]u8 = undefined; 2769 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ r.x, r.y, r.size.width, r.size.height })); 2770 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2771 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2772 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2773 var id_buf: [128]u8 = undefined; 2774 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "\" data-key=\"control:{d}\" data-focus-id=\"{d}\" style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ id, id, r.x, r.y, r.size.width, r.size.height })); 2775 } 2776 }, 2777 else => {}, 2778 } 2779 } 2780 } 2781 2782 // emit hidden form owners beside the rendered panels. their controls point 2783 // back here with the standard HTML `form` attribute. 2784 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2785 // the focus child map preserves insertion order, which matches the order 2786 // widgets were added in code 2787 var iter = root_focus.children.iterator(); 2788 while (iter.next()) |entry| { 2789 const child = entry.value_ptr.*; 2790 const action_url = formAction(child.focus) orelse continue; 2791 2792 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2793 var id_buf: [96]u8 = undefined; 2794 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2795 try appendEscapedHtml(allocator, output, action_url); 2796 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2797 } 2798 } 2799 2800 // the 16 ansi colors as the browser shows them (xterm's defaults) 2801 const ansi_palette = [16]Grid.Color.Rgb{ 2802 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2803 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2804 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2805 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2806 }; 2807 2808 // resolve any color to rgb: palette colors through the ansi table and the 2809 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2810 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2811 return switch (color) { 2812 .rgb => |c| c, 2813 .ansi => |a| ansi_palette[@backingInt(a)], 2814 .indexed => |n| if (n < 16) 2815 ansi_palette[n] 2816 else if (n < 232) blk: { 2817 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2818 const i = n - 16; 2819 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2820 } else blk: { 2821 const v: u8 = 8 + (n - 232) * 10; 2822 break :blk .{ .r = v, .g = v, .b = v }; 2823 }, 2824 }; 2825 } 2826 2827 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2828 // cell's style into `buf`, omitting whichever color is unset. an inverted 2829 // cell swaps the two, falling back to the page's --fg/--bg variables for 2830 // whichever side is unset. text attributes follow the colors. returns an 2831 // empty slice when nothing is set. 2832 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2833 if (style.eql(.{})) return buf[0..0]; 2834 const prefix = " style=\""; 2835 @memcpy(buf[0..prefix.len], prefix); 2836 var i: usize = prefix.len; 2837 const inverted = style.inverted; 2838 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2839 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2840 const decoration: []const u8 = if (style.underline and style.strikethrough) 2841 "text-decoration:underline line-through;" 2842 else if (style.underline) 2843 "text-decoration:underline;" 2844 else if (style.strikethrough) 2845 "text-decoration:line-through;" 2846 else 2847 ""; 2848 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2849 if (style.bold) "font-weight:bold;" else "", 2850 if (style.italic) "font-style:italic;" else "", 2851 decoration, 2852 if (style.dim) "opacity:.6;" else "", 2853 }) catch return buf[0..0]; 2854 i += attributes.len; 2855 if (i >= buf.len) return buf[0..0]; 2856 buf[i] = '"'; 2857 return buf[0 .. i + 1]; 2858 } 2859 2860 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2861 // the color is unset (nothing when both are). returns the new end, or null 2862 // when it doesn't fit. 2863 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2864 const s = if (color) |c| blk: { 2865 const v = colorRgb(c); 2866 break :blk std.fmt.bufPrint(buf[i..], "{s}:#{x:0>2}{x:0>2}{x:0>2};", .{ prop, v.r, v.g, v.b }) catch return null; 2867 } else if (fallback) |f| 2868 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2869 else 2870 return i; 2871 return i + s.len; 2872 } 2873 2874 // a cell's link as an href, when it's a page path or a web or mail url 2875 fn webLink(link: ?[]const u8) ?[]const u8 { 2876 const url = link orelse return null; 2877 // a page path, not a protocol-relative url 2878 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2879 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2880 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2881 } 2882 return null; 2883 } 2884 2885 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2886 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2887 return b == null; 2888 } 2889 2890 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2891 for (input) |ch| { 2892 switch (ch) { 2893 '&' => try out.appendSlice(allocator, "&amp;"), 2894 '<' => try out.appendSlice(allocator, "&lt;"), 2895 '>' => try out.appendSlice(allocator, "&gt;"), 2896 '"' => try out.appendSlice(allocator, "&quot;"), 2897 '\'' => try out.appendSlice(allocator, "&#39;"), 2898 else => try out.append(allocator, ch), 2899 } 2900 } 2901 } 2902 2903 // --- helpers -------------------------------------------------------------- 2904 2905 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2906 var iter = request.iterateHeaders(); 2907 while (iter.next()) |header| { 2908 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2909 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2910 while (pairs.next()) |pair| { 2911 const trimmed = std.mem.trim(u8, pair, " \t"); 2912 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2913 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2914 return trimmed[eq + 1 ..]; 2915 } 2916 } 2917 } 2918 return null; 2919 } 2920 2921 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2922 var iter = std.mem.splitScalar(u8, body, '&'); 2923 while (iter.next()) |pair| { 2924 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2925 if (std.mem.eql(u8, pair[0..eq], key)) { 2926 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2927 } 2928 } 2929 return null; 2930 } 2931 2932 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2933 var buffer: [256]u8 = undefined; 2934 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2935 } 2936 2937 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2938 var out: std.ArrayList(u8) = .empty; 2939 errdefer out.deinit(allocator); 2940 var i: usize = 0; 2941 while (i < encoded.len) : (i += 1) { 2942 switch (encoded[i]) { 2943 '+' => try out.append(allocator, ' '), 2944 '%' => { 2945 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2946 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2947 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2948 try out.append(allocator, hi * 16 + lo); 2949 i += 2; 2950 }, 2951 else => try out.append(allocator, encoded[i]), 2952 } 2953 } 2954 return try out.toOwnedSlice(allocator); 2955 } 2956 2957 // disk-backed web session store. each login mints a random, opaque token 2958 // (not the user's id) that is stored as a file named by the token hex, whose 2959 // contents are the raw user_id bytes. authenticating a request is a lookup of 2960 // the cookie's token; logout deletes the file, revoking the session. there is 2961 // deliberately no expiry — a session lives until logout. form failures use 2962 // files in the flash subdirectory that the redirected GET consumes. the 2963 // directory is cleared whenever the server starts. 2964 pub const SessionStore = struct { 2965 io: std.Io, 2966 dir: std.Io.Dir, 2967 flash_dir: std.Io.Dir, 2968 auto_login: ?[token_hex_len]u8, 2969 2970 pub const token_hex_len = evt.event_id_size * 2; 2971 2972 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2973 try data_dir.createDirPath(io, "sessions"); 2974 const dir = try data_dir.openDir(io, "sessions", .{}); 2975 errdefer dir.close(io); 2976 try dir.deleteTree(io, "flash"); 2977 try dir.createDirPath(io, "flash"); 2978 const flash_dir = try dir.openDir(io, "flash", .{}); 2979 errdefer flash_dir.close(io); 2980 const auto_login = blk: { 2981 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2982 defer file.close(io); 2983 var token: [token_hex_len]u8 = undefined; 2984 var storage: [token_hex_len]u8 = undefined; 2985 var reader = file.reader(io, &storage); 2986 reader.interface.readSliceAll(&token) catch break :blk null; 2987 break :blk token; 2988 }; 2989 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2990 } 2991 2992 pub fn deinit(self: SessionStore) void { 2993 self.flash_dir.close(self.io); 2994 self.dir.close(self.io); 2995 } 2996 2997 // mint a new session for user_id, returning the token hex to set as the 2998 // cookie value. 2999 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3000 var token: [evt.event_id_size]u8 = undefined; 3001 self.io.random(&token); 3002 const token_hex = std.fmt.bytesToHex(token, .lower); 3003 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3004 defer file.close(self.io); 3005 try file.writeStreamingAll(self.io, user_id); 3006 return token_hex; 3007 } 3008 3009 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3010 var token: [evt.event_id_size]u8 = undefined; 3011 self.io.random(&token); 3012 const token_hex = std.fmt.bytesToHex(token, .lower); 3013 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3014 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3015 defer file.close(self.io); 3016 3017 var json: std.Io.Writer.Allocating = .init(allocator); 3018 defer json.deinit(); 3019 try std.json.Stringify.value(value, .{}, &json.writer); 3020 try file.writeStreamingAll(self.io, json.written()); 3021 return token_hex; 3022 } 3023 3024 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3025 if (!isToken(token_hex)) return null; 3026 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3027 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3028 defer file.close(self.io); 3029 3030 var storage: [4096]u8 = undefined; 3031 var reader = file.reader(self.io, &storage); 3032 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3033 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3034 } 3035 3036 // resolve a cookie's token to its user_id. returns false (logged out) for a 3037 // missing, malformed, or unknown token. 3038 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3039 if (!isToken(token_hex)) return false; 3040 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3041 defer file.close(self.io); 3042 var storage: [evt.event_id_size]u8 = undefined; 3043 var file_reader = file.reader(self.io, &storage); 3044 file_reader.interface.readSliceAll(out) catch return false; 3045 return true; 3046 } 3047 3048 // revoke a session. a no-op for a missing or malformed token. 3049 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3050 if (!isToken(token_hex)) return; 3051 self.dir.deleteFile(self.io, token_hex) catch {}; 3052 } 3053 3054 // leave `token_hex`'s session for visitors arriving without one. only the 3055 // `try` fixture writes one. the name can't collide with a session token. 3056 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3057 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3058 defer file.close(self.io); 3059 try file.writeStreamingAll(self.io, token_hex); 3060 } 3061 3062 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3063 out.* = self.auto_login orelse return false; 3064 return true; 3065 } 3066 3067 const auto_login_name = "auto-login"; 3068 3069 // a token is exactly token_hex_len hex chars. validating before using the 3070 // value as a path keeps attacker-supplied cookies from escaping the 3071 // sessions dir (e.g. via "/" or ".." bytes). 3072 fn isToken(token_hex: []const u8) bool { 3073 if (token_hex.len != token_hex_len) return false; 3074 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3075 return true; 3076 } 3077 }; 3078