╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭2f8eb1d0..╮ 2f8eb1d0.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (390) 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
1684 return .{ 1685 .root = try initRoot(allocator, page, session), 1686 .route = route, 1687 .arena = arena, 1688 .history = .empty, 1689 }; 1690 } 1691 1692 pub fn deinit(self: *Nav, allocator: std.mem.Allocator) void { 1693 self.root.deinit(allocator); 1694 freeArena(allocator, self.arena); 1695 for (self.history.items) |*entry| { 1696 entry.root.deinit(allocator); 1697 freeArena(allocator, entry.arena); 1698 } 1699 self.history.deinit(allocator); 1700 } 1701 1702 fn freeArena(allocator: std.mem.Allocator, arena: *std.heap.ArenaAllocator) void { 1703 arena.deinit(); 1704 allocator.destroy(arena); 1705 } 1706 1707 // reconcile the displayed root with the session's navigation state. a 1708 // forward nav (current_page moved to a different parent page) pushes the 1709 // current root and builds the new page in a fresh arena; a back request 1710 // frees the current page and restores the previous one. when escape is 1711 // pressed with no history left we switch to the quit tab instead of quitting. 1712 pub fn sync(self: *Nav, allocator: std.mem.Allocator, session: *Session) !void { 1713 // refresh: rebuild the current page in place from a current moment 1714 if (session.refresh_requested) { 1715 session.refresh_requested = false; 1716 if (session.haxy_moment != null or session.local != null) { 1717 const arena = try allocator.create(std.heap.ArenaAllocator); 1718 arena.* = std.heap.ArenaAllocator.init(allocator); 1719 errdefer freeArena(allocator, arena); 1720 1721 session.page_arena = arena; 1722 1723 const route = session.data.current_page; 1724 const page = try arena.allocator().create(Page); 1725 page.* = try Page.init(arena, session, route); 1726 const new_root = try initRoot(allocator, page, session); 1727 1728 self.root.deinit(allocator); 1729 freeArena(allocator, self.arena); 1730 self.root = new_root; 1731 self.route = route; 1732 self.arena = arena; 1733 } 1734 return; 1735 } 1736 1737 if (session.nav_back) { 1738 session.nav_back = false; 1739 if (self.history.pop()) |entry| { 1740 self.root.deinit(allocator); 1741 freeArena(allocator, self.arena); 1742 self.root = entry.root; 1743 self.route = entry.route; 1744 self.arena = entry.arena; 1745 session.page_arena = entry.arena; 1746 session.data.current_page = entry.route; 1747 return; 1748 } 1749 // nothing to go back to; switch to the quit confirmation 1750 const root_focus = self.root.getFocus(); 1751 var iter = root_focus.children.iterator(); 1752 while (iter.next()) |entry| { 1753 switch (entry.value_ptr.focus.kind) { 1754 .custom => |custom| if (std.mem.eql(u8, custom, Quit.tab_kind)) { 1755 root_focus.setFocus(entry.key_ptr.*); 1756 // a Stack only builds its selected child, so the quit 1757 // button isn't in the focus tree until a build runs with 1758 // the quit tab selected. build once, then send a 1759 // synthetic arrow_down to drop focus from the tab onto 1760 // the button so it's ready to confirm. 1761 try self.root.build(allocator, .{ 1762 .min_size = .{ .width = null, .height = 40 }, 1763 .max_size = .{ .width = 80, .height = null }, 1764 }, root_focus); 1765 try self.root.input(allocator, .arrow_down, root_focus); 1766 break; 1767 }, 1768 else => {}, 1769 } 1770 } 1771 return; 1772 } 1773 1774 // forward navigation: navigate() set next_page to the page to move to (a 1775 // cross-page link or tab change crossing pages) 1776 if (session.next_page) |route| { 1777 session.next_page = null; 1778 if (session.haxy_moment == null and session.local == null) return; 1779 // the page we navigated to becomes the current page 1780 session.data.current_page = route; 1781 1782 const arena = try allocator.create(std.heap.ArenaAllocator); 1783 arena.* = std.heap.ArenaAllocator.init(allocator); 1784 errdefer freeArena(allocator, arena); 1785 1786 session.page_arena = arena; 1787 1788 const page = try arena.allocator().create(Page); 1789 page.* = try Page.init(arena, session, route); 1790 const new_root = try initRoot(allocator, page, session); 1791 1792 try self.history.append(allocator, .{ .root = self.root, .route = self.route, .arena = self.arena }); 1793 // drop the oldest entry (freeing its widget tree and arena) once over cap 1794 if (self.history.items.len > max_history) { 1795 var oldest = self.history.orderedRemove(0); 1796 oldest.root.deinit(allocator); 1797 freeArena(allocator, oldest.arena); 1798 } 1799 self.root = new_root; 1800 self.route = route; 1801 self.arena = arena; 1802 } 1803 } 1804 }; 1805 1806 pub fn initRoot(allocator: std.mem.Allocator, page: *const Page, session: *Session) !Widget { 1807 const page_widget: Widget = switch (page.*) { 1808 .home => |*p| .{ .home = try .init(allocator, p, session) }, 1809 .user => |*p| .{ .user = try .init(allocator, p, session) }, 1810 .repo => |*p| .{ .repo = try .init(allocator, p, session) }, 1811 }; 1812 1813 const demon_art = @embedFile("embed/demon.ans"); 1814 1815 // on the TUI/SSH, the page sits above a one-row footer showing the url 1816 var root = if (session.is_terminal) blk: { 1817 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .vert }); 1818 errdefer box.deinit(allocator); 1819 const bg_id = bg_blk: { 1820 var background = try AnsiBackground.init(allocator, page_widget, demon_art, session); 1821 errdefer background.deinit(allocator); 1822 const id = background.getFocus().id; 1823 try box.children.put(allocator, id, .{ .widget = .{ .background = background }, .rect = null, .min_size = null }); 1824 break :bg_blk id; 1825 }; 1826 { 1827 var footer = try Footer.init(allocator, session); 1828 errdefer footer.deinit(allocator); 1829 try box.children.put(allocator, footer.getFocus().id, .{ .widget = .{ .footer = footer }, .rect = null, .min_size = .{ .width = null, .height = 1 } }); 1830 } 1831 box.getFocus().child_id = bg_id; 1832 break :blk Widget{ .box = box }; 1833 } else Widget{ .background = try AnsiBackground.init(allocator, page_widget, demon_art, session) }; 1834 errdefer root.deinit(allocator); 1835 1836 // input-owning views build their TextInputs in init — so reset the 1837 // focus-id -> *TextInput map here 1838 session.text_inputs.clearRetainingCapacity(); 1839 session.input_values.clearRetainingCapacity(); 1840 1841 try root.build(allocator, .{ 1842 .min_size = .{ .width = null, .height = 40 }, 1843 .max_size = .{ .width = 100, .height = null }, 1844 }, root.getFocus()); 1845 1846 return root; 1847 } 1848 1849 pub const Widget = union(enum) { 1850 text: wgt.Text(Widget), 1851 box: wgt.Box(Widget), 1852 text_box: wgt.TextBox(Widget), 1853 text_input: wgt.TextInput(Widget), 1854 scroll: wgt.Scroll(Widget), 1855 stack: wgt.Stack(Widget), 1856 flow_box: FlowBox, 1857 flow_box_scroll: FlowBox.Scroll, 1858 tag_flow: TagFlow, 1859 spacer: Spacer, 1860 center: Center, 1861 section_label: SectionLabel, 1862 submit_button: SubmitButton, 1863 background: AnsiBackground, 1864 home: Home.View, 1865 user: User.View, 1866 repo: Repo.View, 1867 quit: Quit.View, 1868 unauthorized: Unauthorized.View, 1869 title: Title.View, 1870 sub_title: SubTitle.View, 1871 home_header: Home.Header.View, 1872 user_header: User.Header.View, 1873 repo_header: Repo.Header.View, 1874 repo_files_header: Repo.Files.Header.View, 1875 repo_commits_header: Repo.Commits.Header.View, 1876 repo_issues_header: Repo.Issues.Header, 1877 repo_discussions_header: Repo.Discussions.Header, 1878 repo_files: Repo.Files.View, 1879 repo_commits: Repo.Commits.View, 1880 repo_refs: Repo.Refs.View, 1881 repo_issues: Repo.Issues.View, 1882 repo_discussions: Repo.Discussions.View, 1883 repo_events_header: Repo.Events.Header.View, 1884 repo_events: Repo.Events.View, 1885 repo_comment: Repo.Comment.Item, 1886 clone_url: CloneUrl.View, 1887 home_users: Home.Users.View, 1888 home_repos: Home.Repos.View, 1889 auth_tab: Home.Header.AuthTab.View, 1890 home_settings: Home.Settings.View, 1891 home_auth: Home.Auth.View, 1892 footer: Footer, 1893 1894 pub fn deinit(self: *Widget, allocator: std.mem.Allocator) void { 1895 switch (self.*) { 1896 inline else => |*case| case.deinit(allocator), 1897 } 1898 } 1899 1900 pub fn build(self: *Widget, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) anyerror!void { 1901 switch (self.*) { 1902 inline else => |*case| try case.build(allocator, constraint, root_focus), 1903 } 1904 } 1905 1906 pub fn input(self: *Widget, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) anyerror!void { 1907 switch (self.*) { 1908 inline else => |*case| try case.input(allocator, key, root_focus), 1909 } 1910 } 1911 1912 pub fn clearGrid(self: *Widget) void { 1913 switch (self.*) { 1914 inline else => |*case| case.clearGrid(), 1915 } 1916 } 1917 1918 pub fn getGrid(self: Widget) ?Grid { 1919 switch (self) { 1920 inline else => |*case| return case.getGrid(), 1921 } 1922 } 1923 1924 pub fn getFocus(self: *Widget) *Focus { 1925 switch (self.*) { 1926 inline else => |*case| return case.getFocus(), 1927 } 1928 } 1929 }; 1930 1931 // move the focused row in `box` by `delta`, clamped to the ends, scrolling 1932 // `scroll` to keep it visible. 1933 pub fn moveRowFocus(box: *wgt.Box(Widget), scroll: *wgt.Scroll(Widget), root_focus: *Focus, delta: isize) void { 1934 const keys = box.children.keys(); 1935 if (keys.len == 0) return; 1936 const cur_id = box.getFocus().child_id orelse return; 1937 const cur: isize = @intCast(box.children.getIndex(cur_id) orelse return); 1938 const last: isize = @intCast(keys.len - 1); 1939 const next: usize = @intCast(std.math.clamp(cur + delta, 0, last)); 1940 if (next == @as(usize, @intCast(cur))) return; 1941 root_focus.setFocus(keys[next]); 1942 if (box.children.values()[next].rect) |rect| scroll.scrollToRect(rect); 1943 } 1944 1945 pub const FlowBox = struct { 1946 focus: *Focus, 1947 grid: ?Grid, 1948 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 1949 // backs the per-item strings the text boxes borrow: each box's `content` 1950 // and, for link items, its `.custom` focus kind (e.g. "a:/user/foo"). reset 1951 // wholesale on each setItems so there's no per-string ownership to track. 1952 arena: std.heap.ArenaAllocator, 1953 // column count from the last build — FlowBox.Scroll.input uses it so arrow 1954 // up/down can step by a row's worth of items. 1955 last_cols: usize, 1956 options: Options, 1957 1958 const border_rows: usize = 2; 1959 1960 pub const Options = struct { 1961 cell_width: usize = 40, 1962 cell_height: usize = 3, 1963 }; 1964 1965 pub fn init(allocator: std.mem.Allocator, options: Options) !FlowBox { 1966 return .{ 1967 .focus = try Focus.create(allocator, .container), 1968 .grid = null, 1969 .text_boxes = .empty, 1970 .arena = std.heap.ArenaAllocator.init(allocator), 1971 .last_cols = 1, 1972 .options = options, 1973 }; 1974 } 1975 1976 pub fn deinit(self: *FlowBox, allocator: std.mem.Allocator) void { 1977 self.focus.destroy(allocator); 1978 if (self.grid) |*grid| { 1979 grid.deinit(); 1980 self.grid = null; 1981 } 1982 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 1983 self.text_boxes.deinit(allocator); 1984 self.arena.deinit(); 1985 } 1986 1987 // one flow item: its display text plus an optional link. a non-empty `link` 1988 // sets the item's focus kind such as `.{ .custom = "a:/user/foo" }`, which 1989 // the web renderer turns into an anchor. 1990 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 1991 1992 // both the item text and the link are copied into the arena, so the caller's 1993 // slices needn't outlive this call. 1994 pub fn setItems(self: *FlowBox, allocator: std.mem.Allocator, items: []const Item) !void { 1995 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 1996 self.text_boxes.clearAndFree(allocator); 1997 1998 // the old text boxes (and their borrowed content/links) are gone now, so 1999 // the arena that backed those strings can be reclaimed. 2000 _ = self.arena.reset(.retain_capacity); 2001 const aa = self.arena.allocator(); 2002 2003 self.focus.clear(); 2004 self.focus.child_id = null; 2005 2006 for (items) |item| { 2007 const line = try aa.dupe(u8, item.text); 2008 2009 var text_box = try wgt.TextBox(Widget).init(allocator, line, .{ .border_style = .hidden, .rounded_corners = true, .wrap_kind = .word }); 2010 errdefer text_box.deinit(allocator); 2011 text_box.getFocus().focusable = true; 2012 2013 if (item.link.len > 0) { 2014 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 2015 } 2016 2017 try self.text_boxes.append(allocator, text_box); 2018 } 2019 2020 if (self.text_boxes.items.len > 0) { 2021 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2022 } 2023 } 2024 2025 pub fn build(self: *FlowBox, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2026 self.clearGrid(); 2027 self.focus.clear(); 2028 2029 const cell_width = self.options.cell_width; 2030 const max_width = constraint.max_size.width orelse cell_width; 2031 const cols = if (cell_width == 0) 1 else @max(1, max_width / cell_width); 2032 self.last_cols = cols; 2033 2034 const count = self.text_boxes.items.len; 2035 if (count == 0) return; 2036 const slot_height = self.options.cell_height + border_rows; 2037 if (slot_height == 0) return; 2038 2039 // build at the slot size so every text box fits a single grid cell 2040 for (self.text_boxes.items) |*tb| { 2041 tb.options.border_style = if (self.focus.child_id == tb.getFocus().id) .single else .hidden; 2042 try tb.build(allocator, .{ 2043 .min_size = .{ .width = cell_width, .height = null }, 2044 .max_size = .{ .width = cell_width, .height = slot_height }, 2045 }, root_focus); 2046 } 2047 2048 const rows = (count + cols - 1) / cols; 2049 const content_height = rows * slot_height; 2050 const total_width = cols * cell_width; 2051 if (total_width == 0 or content_height == 0) return; 2052 2053 var grid = try Grid.init(allocator, .{ .width = total_width, .height = content_height }); 2054 errdefer grid.deinit(); 2055 2056 for (self.text_boxes.items, 0..) |*tb, i| { 2057 const tb_grid = tb.getGrid() orelse continue; 2058 const col = i % cols; 2059 const row = i / cols; 2060 const cell_x = col * cell_width; 2061 const cell_y = row * slot_height; 2062 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, cell_x, cell_y); 2063 try grid.drawGrid(tb_grid, cell_x, cell_y); 2064 } 2065 2066 self.grid = grid; 2067 } 2068 2069 pub fn input(self: *FlowBox, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2070 _ = self; 2071 _ = allocator; 2072 _ = key; 2073 _ = root_focus; 2074 } 2075 2076 pub fn clearGrid(self: *FlowBox) void { 2077 if (self.grid) |*grid| { 2078 grid.deinit(); 2079 self.grid = null; 2080 } 2081 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2082 } 2083 2084 pub fn getGrid(self: FlowBox) ?Grid { 2085 return self.grid; 2086 } 2087 2088 pub fn getFocus(self: *FlowBox) *Focus { 2089 return self.focus; 2090 } 2091 2092 pub fn cellRect(self: FlowBox, index: usize) ?layout.IRect { 2093 if (self.last_cols == 0 or index >= self.text_boxes.items.len) return null; 2094 const slot_height = self.options.cell_height + border_rows; 2095 const col = index % self.last_cols; 2096 const row = index / self.last_cols; 2097 return .{ 2098 .x = @intCast(col * self.options.cell_width), 2099 .y = @intCast(row * slot_height), 2100 .size = .{ .width = self.options.cell_width, .height = slot_height }, 2101 }; 2102 } 2103 2104 pub fn indexOfFocusId(self: FlowBox, focus_id: usize) ?usize { 2105 for (self.text_boxes.items, 0..) |tb, i| { 2106 if (tb.box.focus.id == focus_id) return i; 2107 } 2108 return null; 2109 } 2110 2111 pub const Scroll = struct { 2112 scroll: wgt.Scroll(Widget), 2113 2114 pub fn init(allocator: std.mem.Allocator, options: FlowBox.Options, web_native: bool) !Scroll { 2115 var layout_inner = try FlowBox.init(allocator, options); 2116 errdefer layout_inner.deinit(allocator); 2117 var scroll = try wgt.Scroll(Widget).init(allocator, .{ .flow_box = layout_inner }, .{ .direction = .vert, .web_native = web_native }); 2118 errdefer scroll.deinit(allocator); 2119 return .{ .scroll = scroll }; 2120 } 2121 2122 pub fn deinit(self: *Scroll, allocator: std.mem.Allocator) void { 2123 self.scroll.deinit(allocator); 2124 } 2125 2126 pub fn setItems(self: *Scroll, allocator: std.mem.Allocator, items: []const Item) !void { 2127 self.scroll.x = 0; 2128 self.scroll.y = 0; 2129 try self.inner().setItems(allocator, items); 2130 } 2131 2132 pub fn build(self: *Scroll, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2133 try self.scroll.build(allocator, constraint, root_focus); 2134 } 2135 2136 pub fn input(self: *Scroll, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2137 _ = allocator; 2138 const in = self.inner(); 2139 const child_id = in.focus.child_id orelse return; 2140 const current_index = in.indexOfFocusId(child_id) orelse return; 2141 const count = in.text_boxes.items.len; 2142 if (count == 0) return; 2143 const cols = in.last_cols; 2144 const slot_height = in.options.cell_height + FlowBox.border_rows; 2145 2146 var index = current_index; 2147 switch (key) { 2148 .arrow_up => index -|= cols, 2149 .arrow_down => if (index + cols < count) { 2150 index += cols; 2151 }, 2152 .arrow_left => index -|= 1, 2153 .arrow_right => if (index + 1 < count) { 2154 index += 1; 2155 }, 2156 .home => index = 0, 2157 .end => index = count - 1, 2158 .page_up => { 2159 if (self.scroll.grid) |grid| if (slot_height > 0) { 2160 const rows_per_page = grid.size.height / slot_height; 2161 index -|= rows_per_page * cols; 2162 }; 2163 }, 2164 .page_down => { 2165 if (self.scroll.grid) |grid| if (slot_height > 0) { 2166 const rows_per_page = grid.size.height / slot_height; 2167 index = @min(index + rows_per_page * cols, count - 1); 2168 }; 2169 }, 2170 // scroll wheel moves the focused cell by a full row so the 2171 // viewport (via scrollToRect) follows in row-sized steps, 2172 // matching how a scroll wheel feels in a grid view. 2173 .mouse => |mouse| switch (mouse.action) { 2174 .scroll => |dir| switch (dir) { 2175 .up => index -|= cols, 2176 .down => if (index + cols < count) { 2177 index += cols; 2178 }, 2179 }, 2180 else => {}, 2181 }, 2182 else => {}, 2183 } 2184 2185 if (index != current_index) { 2186 root_focus.setFocus(in.text_boxes.items[index].getFocus().id); 2187 if (in.cellRect(index)) |rect| { 2188 self.scroll.scrollToRect(rect); 2189 } 2190 } 2191 } 2192 2193 pub fn clearGrid(self: *Scroll) void { 2194 self.scroll.clearGrid(); 2195 } 2196 2197 pub fn getGrid(self: Scroll) ?Grid { 2198 return self.scroll.getGrid(); 2199 } 2200 2201 pub fn getFocus(self: *Scroll) *Focus { 2202 return self.scroll.getFocus(); 2203 } 2204 2205 pub fn getSelectedIndex(self: Scroll) ?usize { 2206 const in = self.scroll.child.flow_box; 2207 const child_id = in.focus.child_id orelse return null; 2208 return in.indexOfFocusId(child_id); 2209 } 2210 2211 fn inner(self: *Scroll) *FlowBox { 2212 return &self.scroll.child.flow_box; 2213 } 2214 }; 2215 }; 2216 2217 // a left-to-right flow of variable-width focusable items that wraps at the 2218 // available width, like words in a paragraph. unlike FlowBox there is no cell 2219 // grid: each item is as wide as its text. selection movement is driven by the 2220 // owning view via indexOfFocusId/verticalNeighbor. 2221 pub const TagFlow = struct { 2222 focus: *Focus, 2223 grid: ?Grid, 2224 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 2225 // last build's item rects (content space), for vertical navigation and 2226 // scroll-into-view. 2227 rects: std.ArrayList(layout.IRect), 2228 // backs the per-item strings the text boxes borrow. 2229 arena: std.heap.ArenaAllocator, 2230 2231 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 2232 2233 pub fn init(allocator: std.mem.Allocator) !TagFlow { 2234 return .{ 2235 .focus = try Focus.create(allocator, .container), 2236 .grid = null, 2237 .text_boxes = .empty, 2238 .rects = .empty, 2239 .arena = std.heap.ArenaAllocator.init(allocator), 2240 }; 2241 } 2242 2243 pub fn deinit(self: *TagFlow, allocator: std.mem.Allocator) void { 2244 self.focus.destroy(allocator); 2245 if (self.grid) |*grid| { 2246 grid.deinit(); 2247 self.grid = null; 2248 } 2249 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2250 self.text_boxes.deinit(allocator); 2251 self.rects.deinit(allocator); 2252 self.arena.deinit(); 2253 } 2254 2255 // both the item text and the link are copied into the arena, so the caller's 2256 // slices needn't outlive this call. 2257 pub fn setItems(self: *TagFlow, allocator: std.mem.Allocator, items: []const Item) !void { 2258 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2259 self.text_boxes.clearAndFree(allocator); 2260 2261 _ = self.arena.reset(.retain_capacity); 2262 const aa = self.arena.allocator(); 2263 2264 self.focus.clear(); 2265 self.focus.child_id = null; 2266 2267 for (items) |item| { 2268 const line = try aa.dupe(u8, item.text); 2269 2270 var text_box = try wgt.TextBox(Widget).init(allocator, line, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2271 errdefer text_box.deinit(allocator); 2272 text_box.getFocus().focusable = true; 2273 2274 if (item.link.len > 0) { 2275 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 2276 } 2277 2278 try self.text_boxes.append(allocator, text_box); 2279 } 2280 2281 if (self.text_boxes.items.len > 0) { 2282 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2283 } 2284 } 2285 2286 pub fn build(self: *TagFlow, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2287 self.clearGrid(); 2288 self.focus.clear(); 2289 2290 if (self.text_boxes.items.len == 0) return; 2291 const max_width = constraint.max_size.width orelse 80; 2292 if (max_width == 0) return; 2293 2294 // lay the items out left to right, wrapping to a new row when the next 2295 // one wouldn't fit. 2296 self.rects.clearRetainingCapacity(); 2297 var x: usize = 0; 2298 var y: usize = 0; 2299 var row_height: usize = 0; 2300 var total_width: usize = 0; 2301 for (self.text_boxes.items) |*tb| { 2302 try tb.build(allocator, .{ 2303 .min_size = .{ .width = null, .height = null }, 2304 .max_size = .{ .width = max_width, .height = null }, 2305 }, root_focus); 2306 const tb_grid_maybe = tb.getGrid(); 2307 const w: usize = if (tb_grid_maybe) |g| g.size.width else 0; 2308 const h: usize = if (tb_grid_maybe) |g| g.size.height else 0; 2309 if (x > 0 and x + w > max_width) { 2310 x = 0; 2311 y += row_height; 2312 row_height = 0; 2313 } 2314 try self.rects.append(allocator, .{ .x = @intCast(x), .y = @intCast(y), .size = .{ .width = w, .height = h } }); 2315 if (h > row_height) row_height = h; 2316 x += w; 2317 if (x > total_width) total_width = x; 2318 } 2319 2320 const total_height = y + row_height; 2321 if (total_width == 0 or total_height == 0) return; 2322 2323 var grid = try Grid.init(allocator, .{ .width = total_width, .height = total_height }); 2324 errdefer grid.deinit(); 2325 2326 for (self.text_boxes.items, self.rects.items) |*tb, rect| { 2327 const tb_grid = tb.getGrid() orelse continue; 2328 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, @intCast(rect.x), @intCast(rect.y)); 2329 try grid.drawGrid(tb_grid, @intCast(rect.x), @intCast(rect.y)); 2330 } 2331 2332 self.grid = grid; 2333 } 2334 2335 pub fn input(self: *TagFlow, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2336 _ = self; 2337 _ = allocator; 2338 _ = key; 2339 _ = root_focus; 2340 } 2341 2342 pub fn clearGrid(self: *TagFlow) void { 2343 if (self.grid) |*grid| { 2344 grid.deinit(); 2345 self.grid = null; 2346 } 2347 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2348 } 2349 2350 pub fn getGrid(self: TagFlow) ?Grid { 2351 return self.grid; 2352 } 2353 2354 pub fn getFocus(self: *TagFlow) *Focus { 2355 return self.focus; 2356 } 2357 2358 pub fn indexOfFocusId(self: TagFlow, focus_id: usize) ?usize { 2359 for (self.text_boxes.items, 0..) |tb, i| { 2360 if (tb.box.focus.id == focus_id) return i; 2361 } 2362 return null; 2363 } 2364 2365 // the first item of the row below (when `downward`) or above, or null at 2366 // the flow's edge. items are laid out in order, so y is nondecreasing. 2367 pub fn rowStep(self: TagFlow, index: usize, downward: bool) ?usize { 2368 const rects = self.rects.items; 2369 if (index >= rects.len) return null; 2370 const cur_y = rects[index].y; 2371 if (downward) { 2372 for (rects[index + 1 ..], index + 1..) |r, i| { 2373 if (r.y > cur_y) return i; 2374 } 2375 return null; 2376 } 2377 // walk the earlier rows; the last one visited is the row above. 2378 var prev_first: ?usize = null; 2379 var i: usize = 0; 2380 while (i < rects.len and rects[i].y < cur_y) { 2381 prev_first = i; 2382 const y = rects[i].y; 2383 while (i < rects.len and rects[i].y == y) i += 1; 2384 } 2385 return prev_first; 2386 } 2387 }; 2388 2389 // an invisible widget that fills the horizontal space granted by its parent. 2390 // used inside Box(horiz) with a min_size so the box reserves space for the 2391 // children that follow, pushing them to the right. 2392 pub const Spacer = struct { 2393 focus: *Focus, 2394 grid: ?Grid, 2395 2396 pub fn init(allocator: std.mem.Allocator) !Spacer { 2397 return .{ 2398 .focus = try Focus.create(allocator, .container), 2399 .grid = null, 2400 }; 2401 } 2402 2403 pub fn deinit(self: *Spacer, allocator: std.mem.Allocator) void { 2404 self.focus.destroy(allocator); 2405 if (self.grid) |*grid| { 2406 grid.deinit(); 2407 self.grid = null; 2408 } 2409 } 2410 2411 pub fn build(self: *Spacer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2412 _ = root_focus; 2413 self.clearGrid(); 2414 const width = constraint.max_size.width orelse return; 2415 if (width == 0) return; 2416 self.grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2417 } 2418 2419 pub fn input(self: *Spacer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2420 _ = self; 2421 _ = allocator; 2422 _ = key; 2423 _ = root_focus; 2424 } 2425 2426 pub fn clearGrid(self: *Spacer) void { 2427 if (self.grid) |*grid| { 2428 grid.deinit(); 2429 self.grid = null; 2430 } 2431 } 2432 2433 pub fn getGrid(self: Spacer) ?Grid { 2434 return self.grid; 2435 } 2436 2437 pub fn getFocus(self: *Spacer) *Focus { 2438 return self.focus; 2439 } 2440 }; 2441 2442 // a one-row, non-focusable status bar showing the current page's url 2443 pub const Footer = struct { 2444 focus: *Focus, 2445 grid: ?Grid, 2446 session: *Session, 2447 arena: std.heap.ArenaAllocator, 2448 url: []const u8 = "", 2449 url_width: usize = 0, 2450 2451 pub fn init(allocator: std.mem.Allocator, session: *Session) !Footer { 2452 return .{ 2453 .focus = try Focus.create(allocator, .container), 2454 .grid = null, 2455 .session = session, 2456 .arena = std.heap.ArenaAllocator.init(allocator), 2457 }; 2458 } 2459 2460 pub fn deinit(self: *Footer, allocator: std.mem.Allocator) void { 2461 self.focus.destroy(allocator); 2462 if (self.grid) |*grid| grid.deinit(); 2463 self.arena.deinit(); 2464 } 2465 2466 pub fn build(self: *Footer, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2467 _ = root_focus; 2468 self.clearGrid(); 2469 const width = constraint.max_size.width orelse return; 2470 if (width == 0) return; 2471 2472 _ = self.arena.reset(.retain_capacity); 2473 self.url = ""; 2474 self.url_width = 0; 2475 const aa = self.arena.allocator(); 2476 const path = self.session.data.current_page.toUrl(&self.arena) catch return; 2477 const text = terminalWebUrl(aa, self.session, path) catch return; 2478 self.url = text; 2479 2480 var grid = try Grid.init(allocator, .{ .width = width, .height = 1 }); 2481 errdefer grid.deinit(); 2482 var utf8 = (std.unicode.Utf8View.init(text) catch return).iterator(); 2483 var i: usize = 0; 2484 while (utf8.nextCodepointSlice()) |ch| { 2485 if (i == width) break; 2486 grid.cells.items[try grid.cells.at(.{ 0, i })].rune = ch; 2487 i += 1; 2488 } 2489 self.url_width = i; 2490 self.grid = grid; 2491 } 2492 2493 pub fn input(self: *Footer, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2494 _ = allocator; 2495 switch (key) { 2496 .mouse => |mouse| { 2497 if (mouse.ctrl or !inp.leftClickOn(root_focus, self.getFocus().id, mouse)) return; 2498 const rect = (root_focus.children.get(self.getFocus().id) orelse return).rect; 2499 if (mouse.x < rect.x + self.url_width) self.session.host_request = .{ .show_copyable_text = self.url }; 2500 }, 2501 else => {}, 2502 } 2503 } 2504 2505 pub fn clearGrid(self: *Footer) void { 2506 if (self.grid) |*grid| { 2507 grid.deinit(); 2508 self.grid = null; 2509 } 2510 } 2511 2512 pub fn getGrid(self: Footer) ?Grid { 2513 return self.grid; 2514 } 2515 2516 pub fn getFocus(self: *Footer) *Focus { 2517 return self.focus; 2518 } 2519 }; 2520 2521 // a single-child wrapper that builds the child at its natural size and 2522 // positions its grid in the middle of the area granted by the parent 2523 // a bordered label, indented past the content it precedes 2524 pub const SectionLabel = struct { 2525 box: wgt.Box(Widget), 2526 2527 pub fn init(allocator: std.mem.Allocator, content: []const u8) !SectionLabel { 2528 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2529 errdefer box.deinit(allocator); 2530 2531 { 2532 var gap = try wgt.Text(Widget).init(allocator, " "); 2533 errdefer gap.deinit(allocator); 2534 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2535 } 2536 2537 { 2538 var tb = try wgt.TextBox(Widget).init(allocator, content, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2539 errdefer tb.deinit(allocator); 2540 tb.getFocus().focusable = true; 2541 try box.children.put(allocator, tb.getFocus().id, .{ .widget = .{ .text_box = tb }, .rect = null, .min_size = null }); 2542 } 2543 2544 box.getFocus().child_id = box.children.keys()[1]; 2545 return .{ .box = box }; 2546 } 2547 2548 pub fn deinit(self: *SectionLabel, allocator: std.mem.Allocator) void { 2549 self.box.deinit(allocator); 2550 } 2551 2552 pub fn build(self: *SectionLabel, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2553 try self.box.build(allocator, constraint, root_focus); 2554 } 2555 2556 pub fn input(self: *SectionLabel, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2557 _ = self; 2558 _ = allocator; 2559 _ = key; 2560 _ = root_focus; 2561 } 2562 2563 pub fn clearGrid(self: *SectionLabel) void { 2564 self.box.clearGrid(); 2565 } 2566 2567 pub fn getGrid(self: SectionLabel) ?Grid { 2568 return self.box.getGrid(); 2569 } 2570 2571 pub fn getFocus(self: *SectionLabel) *Focus { 2572 return self.box.getFocus(); 2573 } 2574 }; 2575 2576 // a submit button, indented past its form's content. the web overlay POSTs 2577 // the button's form; terminal hosts detect presses through `buttonId`. 2578 pub const SubmitButton = struct { 2579 box: wgt.Box(Widget), 2580 2581 pub fn init(allocator: std.mem.Allocator) !SubmitButton { 2582 return initLabeled(allocator, "submit"); 2583 } 2584 2585 pub fn initLabeled(allocator: std.mem.Allocator, label: []const u8) !SubmitButton { 2586 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .horiz }); 2587 errdefer box.deinit(allocator); 2588 2589 { 2590 var gap = try wgt.Text(Widget).init(allocator, " "); 2591 errdefer gap.deinit(allocator); 2592 try box.children.put(allocator, gap.getFocus().id, .{ .widget = .{ .text = gap }, .rect = null, .min_size = null }); 2593 } 2594 2595 { 2596 var button = try wgt.TextBox(Widget).init(allocator, label, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2597 errdefer button.deinit(allocator); 2598 button.getFocus().focusable = true; 2599 // the renderer distinguishes plain clickables from buttons that 2600 // should POST to a server route by this kind. 2601 button.getFocus().kind = .{ .custom = "submit" }; 2602 try box.children.put(allocator, button.getFocus().id, .{ .widget = .{ .text_box = button }, .rect = null, .min_size = .{ .width = label.len + 2, .height = null } }); 2603 } 2604 2605 box.getFocus().child_id = box.children.keys()[1]; 2606 return .{ .box = box }; 2607 } 2608 2609 pub fn deinit(self: *SubmitButton, allocator: std.mem.Allocator) void { 2610 self.box.deinit(allocator); 2611 } 2612 2613 pub fn build(self: *SubmitButton, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2614 try self.box.build(allocator, constraint, root_focus); 2615 } 2616 2617 pub fn input(self: *SubmitButton, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2618 _ = self; 2619 _ = allocator; 2620 _ = key; 2621 _ = root_focus; 2622 } 2623 2624 pub fn clearGrid(self: *SubmitButton) void { 2625 self.box.clearGrid(); 2626 } 2627 2628 pub fn getGrid(self: SubmitButton) ?Grid { 2629 return self.box.getGrid(); 2630 } 2631 2632 pub fn getFocus(self: *SubmitButton) *Focus { 2633 return self.box.getFocus(); 2634 } 2635 2636 // the button's focus id, for click hit-testing 2637 pub fn buttonId(self: *const SubmitButton) usize { 2638 return self.box.children.keys()[1]; 2639 } 2640 }; 2641 2642 pub const Center = struct { 2643 focus: *Focus, 2644 grid: ?Grid, 2645 child: *Widget, 2646 2647 pub fn init(allocator: std.mem.Allocator, child_widget: Widget) !Center { 2648 const child = try allocator.create(Widget); 2649 errdefer allocator.destroy(child); 2650 child.* = child_widget; 2651 return .{ 2652 .focus = try Focus.create(allocator, .container), 2653 .grid = null, 2654 .child = child, 2655 }; 2656 } 2657 2658 pub fn deinit(self: *Center, allocator: std.mem.Allocator) void { 2659 self.focus.destroy(allocator); 2660 if (self.grid) |*grid| { 2661 grid.deinit(); 2662 self.grid = null; 2663 } 2664 self.child.deinit(allocator); 2665 allocator.destroy(self.child); 2666 } 2667 2668 pub fn build(self: *Center, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2669 self.clearGrid(); 2670 self.getFocus().clear(); 2671 2672 // build the child without forcing it to fill min_size; it sizes 2673 // itself to its content within the available max. 2674 try self.child.build(allocator, .{ 2675 .min_size = .{ .width = null, .height = null }, 2676 .max_size = constraint.max_size, 2677 }, root_focus); 2678 2679 const child_grid = self.child.getGrid() orelse return; 2680 2681 // prefer max when given; otherwise grow to max(min, child) so that 2682 // when only a min is set (e.g. the wasm path passes viewport rows 2683 // as min_height with no max), we can still vertically center while 2684 // letting taller content extend past the min. 2685 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; 2686 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; 2687 if (width == 0 or height == 0) return; 2688 2689 const offset_x: usize = (width -| child_grid.size.width) / 2; 2690 const offset_y: usize = (height -| child_grid.size.height) / 2; 2691 2692 var grid = try Grid.init(allocator, .{ .width = width, .height = height }); 2693 errdefer grid.deinit(); 2694 try grid.drawGrid(child_grid, offset_x, offset_y); 2695 try self.getFocus().addChild(allocator, self.child.getFocus(), child_grid.size, offset_x, offset_y); 2696 self.getFocus().child_id = self.child.getFocus().id; 2697 2698 self.grid = grid; 2699 } 2700 2701 pub fn input(self: *Center, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2702 try self.child.input(allocator, key, root_focus); 2703 } 2704 2705 pub fn clearGrid(self: *Center) void { 2706 if (self.grid) |*grid| { 2707 grid.deinit(); 2708 self.grid = null; 2709 } 2710 self.child.clearGrid(); 2711 } 2712 2713 pub fn getGrid(self: Center) ?Grid { 2714 return self.grid; 2715 } 2716 2717 pub fn getFocus(self: *Center) *Focus { 2718 return self.focus; 2719 } 2720 }; 2721 2722 // renders truecolor ANSI art 2723 pub const AnsiArt = struct { 2724 focus: *Focus, 2725 grid: ?Grid, 2726 content: []const u8, 2727 2728 pub fn init(allocator: std.mem.Allocator, content: []const u8) !AnsiArt { 2729 return .{ 2730 .focus = try Focus.create(allocator, .container), 2731 .grid = null, 2732 .content = content, 2733 }; 2734 } 2735 2736 pub fn deinit(self: *AnsiArt, allocator: std.mem.Allocator) void { 2737 self.focus.destroy(allocator); 2738 if (self.grid) |*grid| { 2739 grid.deinit(); 2740 self.grid = null; 2741 } 2742 } 2743 2744 pub fn build(self: *AnsiArt, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2745 _ = root_focus; 2746 self.clearGrid(); 2747 2748 // parse into rows of cells, then copy into a rectangular grid 2749 var rows: std.ArrayList(std.ArrayList(Grid.Cell)) = .empty; 2750 defer { 2751 for (rows.items) |*row| row.deinit(allocator); 2752 rows.deinit(allocator); 2753 } 2754 var row: std.ArrayList(Grid.Cell) = .empty; 2755 errdefer row.deinit(allocator); 2756 2757 var style: Grid.Style = .{}; 2758 var width: usize = 0; 2759 const content = self.content; 2760 var i: usize = 0; 2761 while (i < content.len) { 2762 const byte = content[i]; 2763 if (byte == '\n') { 2764 width = @max(width, row.items.len); 2765 try rows.append(allocator, row); 2766 row = .empty; 2767 i += 1; 2768 } else if (byte == 0x1B and i + 1 < content.len and content[i + 1] == '[') { 2769 // CSI: scan to the final byte (0x40..0x7E); apply it if it's 'm' 2770 var j = i + 2; 2771 while (j < content.len and !(content[j] >= 0x40 and content[j] <= 0x7E)) j += 1; 2772 if (j >= content.len) { 2773 i = content.len; // malformed trailing escape; stop 2774 } else { 2775 if (content[j] == 'm') applySgr(&style, content[i + 2 .. j]); 2776 i = j + 1; 2777 } 2778 } else { 2779 const len = std.unicode.utf8ByteSequenceLength(byte) catch 1; 2780 const end = @min(content.len, i + len); 2781 const rune = content[i..end]; 2782 const transparent = end - i == 1 and rune[0] == ' ' and 2783 style.fg == null and style.bg == null and !style.inverted; 2784 try row.append(allocator, .{ 2785 .rune = if (transparent) null else rune, 2786 .style = style, 2787 }); 2788 i = end; 2789 } 2790 } 2791 // a trailing row with content but no closing newline 2792 if (row.items.len > 0) { 2793 width = @max(width, row.items.len); 2794 try rows.append(allocator, row); 2795 } else { 2796 row.deinit(allocator); 2797 } 2798 row = .empty; // ownership moved into rows (or freed); keep errdefer safe 2799 2800 const height = rows.items.len; 2801 if (width == 0 or height == 0) return; 2802 2803 const clamped_w = @min(width, constraint.max_size.width orelse width); 2804 const clamped_h = @min(height, constraint.max_size.height orelse height); 2805 2806 var grid = try Grid.init(allocator, .{ .width = clamped_w, .height = clamped_h }); 2807 errdefer grid.deinit(); 2808 for (rows.items[0..clamped_h], 0..) |r, y| { 2809 const n = @min(r.items.len, clamped_w); 2810 for (r.items[0..n], 0..) |cell, x| { 2811 grid.cells.items[try grid.cells.at(.{ y, x })] = cell; 2812 } 2813 } 2814 self.grid = grid; 2815 } 2816 2817 pub fn clearGrid(self: *AnsiArt) void { 2818 if (self.grid) |*grid| { 2819 grid.deinit(); 2820 self.grid = null; 2821 } 2822 } 2823 2824 pub fn getGrid(self: AnsiArt) ?Grid { 2825 return self.grid; 2826 } 2827 2828 pub fn getFocus(self: *AnsiArt) *Focus { 2829 return self.focus; 2830 } 2831 2832 fn applySgr(style: *Grid.Style, params: []const u8) void { 2833 var nums: [16]u32 = undefined; 2834 var n: usize = 0; 2835 var it = std.mem.splitScalar(u8, params, ';'); 2836 while (it.next()) |tok| { 2837 if (n >= nums.len) break; 2838 // an empty parameter (e.g. bare "\x1b[m") means 0 2839 nums[n] = std.fmt.parseInt(u32, tok, 10) catch 0; 2840 n += 1; 2841 } 2842 if (n == 0) { 2843 style.* = .{}; 2844 return; 2845 } 2846 var i: usize = 0; 2847 while (i < n) : (i += 1) { 2848 switch (nums[i]) { 2849 0 => style.* = .{}, 2850 7 => style.inverted = true, 2851 27 => style.inverted = false, 2852 39 => style.fg = null, 2853 49 => style.bg = null, 2854 38, 48 => { 2855 // truecolor form: 38;2;r;g;b — anything else is ignored 2856 if (i + 4 < n and nums[i + 1] == 2) { 2857 const c = Grid.Color{ 2858 .r = @truncate(nums[i + 2]), 2859 .g = @truncate(nums[i + 3]), 2860 .b = @truncate(nums[i + 4]), 2861 }; 2862 if (nums[i] == 38) style.fg = c else style.bg = c; 2863 i += 4; 2864 } 2865 }, 2866 else => {}, 2867 } 2868 } 2869 } 2870 }; 2871 2872 // a full-screen wrapper that renders ANSI art behind whatever page it wraps 2873 pub const AnsiBackground = struct { 2874 grid: ?Grid, 2875 child: *Widget, 2876 art: AnsiArt, 2877 session: *Session, 2878 2879 pub fn init(allocator: std.mem.Allocator, child_widget: Widget, art_content: []const u8, session: *Session) !AnsiBackground { 2880 var cw = child_widget; 2881 const child = allocator.create(Widget) catch |e| { 2882 cw.deinit(allocator); 2883 return e; 2884 }; 2885 child.* = cw; 2886 errdefer { 2887 child.deinit(allocator); 2888 allocator.destroy(child); 2889 } 2890 return .{ .grid = null, .child = child, .art = try AnsiArt.init(allocator, art_content), .session = session }; 2891 } 2892 2893 pub fn deinit(self: *AnsiBackground, allocator: std.mem.Allocator) void { 2894 if (self.grid) |*grid| grid.deinit(); 2895 self.art.deinit(allocator); 2896 self.child.deinit(allocator); 2897 allocator.destroy(self.child); 2898 } 2899 2900 pub fn build(self: *AnsiBackground, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2901 self.clearGrid(); 2902 2903 // make the wrapped page fill the whole available area 2904 try self.child.build(allocator, .{ 2905 .min_size = .{ 2906 .width = constraint.max_size.width orelse constraint.min_size.width, 2907 .height = constraint.max_size.height orelse constraint.min_size.height, 2908 }, 2909 .max_size = constraint.max_size, 2910 }, root_focus); 2911 2912 if (self.session.data.enable_ansi) { 2913 if (self.child.getGrid()) |fg| { 2914 self.grid = try artBehind(allocator, fg, &self.art, .top_right, self.session.is_terminal, root_focus); 2915 } 2916 } 2917 } 2918 2919 pub fn input(self: *AnsiBackground, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2920 try self.child.input(allocator, key, root_focus); 2921 } 2922 2923 pub fn clearGrid(self: *AnsiBackground) void { 2924 if (self.grid) |*grid| { 2925 grid.deinit(); 2926 self.grid = null; 2927 } 2928 self.child.clearGrid(); 2929 self.art.clearGrid(); 2930 } 2931 2932 pub fn getGrid(self: AnsiBackground) ?Grid { 2933 return self.grid orelse self.child.getGrid(); 2934 } 2935 2936 pub fn getFocus(self: *AnsiBackground) *Focus { 2937 return self.child.getFocus(); 2938 } 2939 2940 // which top corner the art hugs. 2941 const ArtAnchor = enum { top_left, top_right }; 2942 2943 // a foreground cell counts as blank if it's empty or a bare space without styling 2944 fn cellIsBlank(cell: Grid.Cell) bool { 2945 if (cell.rune) |rune| { 2946 return std.mem.eql(u8, rune, " ") and 2947 cell.style.fg == null and cell.style.bg == null and !cell.style.inverted; 2948 } 2949 return true; 2950 } 2951 2952 // the art is dimmed to this fraction of its brightness so foreground text 2953 // stays legible over it 2954 const art_brightness = 45; // percent 2955 2956 fn dimColor(color: ?Grid.Color) ?Grid.Color { 2957 const c = color orelse return null; 2958 return .{ 2959 .r = @intCast(@as(u16, c.r) * art_brightness / 100), 2960 .g = @intCast(@as(u16, c.g) * art_brightness / 100), 2961 .b = @intCast(@as(u16, c.b) * art_brightness / 100), 2962 }; 2963 } 2964 2965 // terminals that don't support truecolor misparse a "38;2;r;g;b"/"48;2;…" 2966 // SGR as a list of plain SGR codes, so any channel value in 1..9 turns on 2967 // a text attribute (5/6 = blink, 7 = inverse, 8 = conceal, …). 2968 // snap such channels clear of that range so the backdrop doesn't blink or 2969 // hide text there; the ≤9/255 shift is imperceptible on terminals that 2970 // actually render truecolor. 2971 fn sgrSafe(color: ?Grid.Color) ?Grid.Color { 2972 const c = color orelse return null; 2973 const snap = struct { 2974 fn f(v: u8) u8 { 2975 return if (v >= 1 and v <= 9) 10 else v; 2976 } 2977 }.f; 2978 return .{ .r = snap(c.r), .g = snap(c.g), .b = snap(c.b) }; 2979 } 2980 2981 // composites ANSI art behind a foreground grid 2982 fn artBehind(allocator: std.mem.Allocator, foreground: Grid, art: *AnsiArt, anchor: ArtAnchor, is_terminal: bool, root_focus: *Focus) !Grid { 2983 art.clearGrid(); 2984 try art.build(allocator, .{ 2985 .min_size = .{ .width = null, .height = null }, 2986 .max_size = .{ .width = foreground.size.width, .height = foreground.size.height }, 2987 }, root_focus); 2988 2989 var out = try Grid.initFromGrid(allocator, foreground, foreground.size, 0, 0); 2990 errdefer out.deinit(); 2991 2992 if (art.getGrid()) |art_grid| { 2993 const anchor_x = switch (anchor) { 2994 .top_left => 0, 2995 .top_right => foreground.size.width -| art_grid.size.width, 2996 }; 2997 for (0..art_grid.size.height) |y| { 2998 for (0..art_grid.size.width) |x| { 2999 const src = art_grid.cells.items[try art_grid.cells.at(.{ y, x })]; 3000 if (src.rune == null) continue; 3001 const idx = out.cells.at(.{ y, anchor_x + x }) catch continue; 3002 const dst = &out.cells.items[idx]; 3003 // composite the dimmed art behind every cell so it shows 3004 // through the whole UI: a blank cell becomes the art, while a 3005 // cell with a glyph keeps the glyph but takes the dimmed art as 3006 // its background (replacing whatever background it had, which 3007 // would otherwise obscure the art). 3008 if (cellIsBlank(dst.*)) { 3009 dst.* = src; 3010 dst.style.fg = sgrSafe(dimColor(dst.style.fg)); 3011 dst.style.bg = sgrSafe(dimColor(dst.style.bg)); 3012 } else { 3013 const background_maybe = sgrSafe(dimColor(src.style.bg orelse src.style.fg)); 3014 dst.style.bg = background_maybe; 3015 // change the color of text overlaying ANSI art to ensure 3016 // it is readable. don't do this in the web UI, since we 3017 // have direct control of the theme there (also, inner 3018 // scroll panes allow text to move without a re-render 3019 // by the TUI, which would break this). also don't do this 3020 // if the text is explicitly styled. 3021 if (is_terminal and dst.style.fg == null) { 3022 if (background_maybe) |background| { 3023 // use near-black and near-white, which is easier on the eyes 3024 // while retaining high contrast 3025 const luminance = (@as(u32, background.r) * 299 + 3026 @as(u32, background.g) * 587 + 3027 @as(u32, background.b) * 114) / 1000; 3028 dst.style.fg = if (luminance >= 128) 3029 .{ .r = 16, .g = 16, .b = 16 } 3030 else 3031 .{ .r = 240, .g = 240, .b = 240 }; 3032 } 3033 } 3034 } 3035 } 3036 } 3037 } 3038 return out; 3039 } 3040 }; 3041