╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ ui.zig ───────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭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
1919 // frees the current page and restores the previous one. when escape is 1920 // pressed with no history left we switch to the quit tab instead of quitting. 1921 pub fn sync(self: *Nav, allocator: std.mem.Allocator, session: *Session) !void { 1922 // refresh: rebuild the current page in place from a current moment 1923 if (session.refresh_requested) { 1924 session.refresh_requested = false; 1925 if (session.haxy_moment != null or session.local != null) { 1926 const arena = try allocator.create(std.heap.ArenaAllocator); 1927 arena.* = std.heap.ArenaAllocator.init(allocator); 1928 errdefer freeArena(allocator, arena); 1929 1930 session.page_arena = arena; 1931 1932 const route = session.data.current_page; 1933 const page = try arena.allocator().create(Page); 1934 page.* = try Page.init(arena, session, route); 1935 const new_root = try initRoot(allocator, page, session); 1936 1937 self.root.deinit(allocator); 1938 freeArena(allocator, self.arena); 1939 self.root = new_root; 1940 self.route = route; 1941 self.arena = arena; 1942 } 1943 return; 1944 } 1945 1946 if (session.nav_back) { 1947 session.nav_back = false; 1948 if (self.history.pop()) |entry| { 1949 self.root.deinit(allocator); 1950 freeArena(allocator, self.arena); 1951 self.root = entry.root; 1952 self.route = entry.route; 1953 self.arena = entry.arena; 1954 session.page_arena = entry.arena; 1955 session.data.current_page = entry.route; 1956 chooseAnsiArtForNavigation(session); 1957 return; 1958 } 1959 // nothing to go back to; switch to the quit confirmation 1960 const root_focus = self.root.getFocus(); 1961 var iter = root_focus.children.iterator(); 1962 while (iter.next()) |entry| { 1963 switch (entry.value_ptr.focus.kind) { 1964 .custom => |custom| if (std.mem.eql(u8, custom, Quit.tab_kind)) { 1965 root_focus.setFocus(entry.key_ptr.*); 1966 // a Stack only builds its selected child, so the quit 1967 // button isn't in the focus tree until a build runs with 1968 // the quit tab selected. build once, then send a 1969 // synthetic arrow_down to drop focus from the tab onto 1970 // the button so it's ready to confirm. 1971 try self.root.build(allocator, .{ 1972 .min_size = .{ .width = null, .height = 40 }, 1973 .max_size = .{ .width = 80, .height = null }, 1974 }, root_focus); 1975 try self.root.input(allocator, .arrow_down, root_focus); 1976 break; 1977 }, 1978 else => {}, 1979 } 1980 } 1981 return; 1982 } 1983 1984 // forward navigation: navigate() set next_page to the page to move to (a 1985 // cross-page link or tab change crossing pages) 1986 if (session.next_page) |route| { 1987 session.next_page = null; 1988 if (session.haxy_moment == null and session.local == null) return; 1989 // the page we navigated to becomes the current page 1990 session.data.current_page = route; 1991 1992 const arena = try allocator.create(std.heap.ArenaAllocator); 1993 arena.* = std.heap.ArenaAllocator.init(allocator); 1994 errdefer freeArena(allocator, arena); 1995 1996 session.page_arena = arena; 1997 1998 const page = try arena.allocator().create(Page); 1999 page.* = try Page.init(arena, session, route); 2000 const new_root = try initRoot(allocator, page, session); 2001 2002 try self.history.append(allocator, .{ .root = self.root, .route = self.route, .arena = self.arena }); 2003 // drop the oldest entry (freeing its widget tree and arena) once over cap 2004 if (self.history.items.len > max_history) { 2005 var oldest = self.history.orderedRemove(0); 2006 oldest.root.deinit(allocator); 2007 freeArena(allocator, oldest.arena); 2008 } 2009 self.root = new_root; 2010 self.route = route; 2011 self.arena = arena; 2012 } 2013 } 2014 }; 2015 2016 pub fn initRoot(allocator: std.mem.Allocator, page: *const Page, session: *Session) !Widget { 2017 const page_widget: Widget = switch (page.*) { 2018 .home => |*p| .{ .home = try .init(allocator, p, session) }, 2019 .user => |*p| .{ .user = try .init(allocator, p, session) }, 2020 .repo => |*p| .{ .repo = try .init(allocator, p, session) }, 2021 }; 2022 2023 chooseAnsiArtForNavigation(session); 2024 2025 // on the TUI/SSH, the page sits above a one-row footer showing the url 2026 var root = if (session.is_terminal) blk: { 2027 var box = try wgt.Box(Widget).init(allocator, .{ .border_style = null, .direction = .vert }); 2028 errdefer box.deinit(allocator); 2029 const bg_id = bg_blk: { 2030 var background = try AnsiBackground.init(allocator, page_widget, session); 2031 errdefer background.deinit(allocator); 2032 const id = background.getFocus().id; 2033 try box.children.put(allocator, id, .{ .widget = .{ .background = background }, .rect = null, .min_size = null }); 2034 break :bg_blk id; 2035 }; 2036 { 2037 var footer = try Footer.init(allocator, session); 2038 errdefer footer.deinit(allocator); 2039 try box.children.put(allocator, footer.getFocus().id, .{ .widget = .{ .footer = footer }, .rect = null, .min_size = .{ .width = null, .height = 1 } }); 2040 } 2041 box.getFocus().child_id = bg_id; 2042 break :blk Widget{ .box = box }; 2043 } else Widget{ .background = try AnsiBackground.init(allocator, page_widget, session) }; 2044 errdefer root.deinit(allocator); 2045 2046 // input-owning views build their TextInputs in init, so reset their 2047 // registrations here 2048 session.text_inputs.clearRetainingCapacity(); 2049 session.input_values.clearRetainingCapacity(); 2050 2051 try root.build(allocator, .{ 2052 .min_size = .{ .width = null, .height = 40 }, 2053 .max_size = .{ .width = 100, .height = null }, 2054 }, root.getFocus()); 2055 2056 return root; 2057 } 2058 2059 // native and server-side sessions choose from the embedded collection. WASM 2060 // keeps the art serialized by the server instead. 2061 fn chooseAnsiArtForNavigation(session: *Session) void { 2062 if (comptime ansi_arts.len == 0) return; 2063 const io = session.io orelse return; 2064 var random: usize = undefined; 2065 io.random(std.mem.asBytes(&random)); 2066 session.data.ansi_art = ansi_arts[random % ansi_arts.len]; 2067 } 2068 2069 pub const Widget = union(enum) { 2070 text: wgt.Text(Widget), 2071 box: wgt.Box(Widget), 2072 text_box: wgt.TextBox(Widget), 2073 text_input: wgt.TextInput(Widget), 2074 scroll: wgt.Scroll(Widget), 2075 stack: wgt.Stack(Widget), 2076 flow_box: FlowBox, 2077 flow_box_scroll: FlowBox.Scroll, 2078 tag_flow: TagFlow, 2079 spacer: Spacer, 2080 center: Center, 2081 section_label: SectionLabel, 2082 submit_button: SubmitButton, 2083 background: AnsiBackground, 2084 home: Home.View, 2085 user: User.View, 2086 repo: Repo.View, 2087 quit: Quit.View, 2088 unauthorized: Unauthorized.View, 2089 title: Title.View, 2090 sub_title: SubTitle.View, 2091 home_header: Home.Header.View, 2092 user_header: User.Header.View, 2093 repo_header: Repo.Header.View, 2094 repo_files_header: Repo.Files.Header.View, 2095 repo_commits_header: Repo.Commits.Header.View, 2096 repo_issues_header: Repo.Issues.Header, 2097 repo_patches_header: Repo.Patches.Header, 2098 repo_discussions_header: Repo.Discussions.Header, 2099 repo_files: Repo.Files.View, 2100 repo_commits: Repo.Commits.View, 2101 repo_refs: Repo.Refs.View, 2102 repo_issues: Repo.Issues.View, 2103 repo_patches: Repo.Patches.View, 2104 repo_discussions: Repo.Discussions.View, 2105 repo_events_header: Repo.Events.Header.View, 2106 repo_events: Repo.Events.View, 2107 repo_comment: Repo.Comment.Item, 2108 copyable_text: CopyableText.View, 2109 home_users: Home.Users.View, 2110 home_repos: Home.Repos.View, 2111 auth_tab: Home.Header.AuthTab.View, 2112 home_settings: Home.Settings.View, 2113 home_auth: Home.Auth.View, 2114 footer: Footer, 2115 2116 pub fn deinit(self: *Widget, allocator: std.mem.Allocator) void { 2117 switch (self.*) { 2118 inline else => |*case| case.deinit(allocator), 2119 } 2120 } 2121 2122 pub fn build(self: *Widget, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) anyerror!void { 2123 switch (self.*) { 2124 inline else => |*case| try case.build(allocator, constraint, root_focus), 2125 } 2126 } 2127 2128 pub fn input(self: *Widget, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) anyerror!void { 2129 switch (self.*) { 2130 inline else => |*case| try case.input(allocator, key, root_focus), 2131 } 2132 } 2133 2134 pub fn clearGrid(self: *Widget) void { 2135 switch (self.*) { 2136 inline else => |*case| case.clearGrid(), 2137 } 2138 } 2139 2140 pub fn getGrid(self: Widget) ?Grid { 2141 switch (self) { 2142 inline else => |*case| return case.getGrid(), 2143 } 2144 } 2145 2146 pub fn getFocus(self: *Widget) *Focus { 2147 switch (self.*) { 2148 inline else => |*case| return case.getFocus(), 2149 } 2150 } 2151 }; 2152 2153 // move the focused row in `box` by `delta`, clamped to the ends, scrolling 2154 // `scroll` to keep it visible. 2155 pub fn moveRowFocus(box: *wgt.Box(Widget), scroll: *wgt.Scroll(Widget), root_focus: *Focus, delta: isize) void { 2156 const keys = box.children.keys(); 2157 if (keys.len == 0) return; 2158 const cur_id = box.getFocus().child_id orelse return; 2159 const cur: isize = @intCast(box.children.getIndex(cur_id) orelse return); 2160 const last: isize = @intCast(keys.len - 1); 2161 const next: usize = @intCast(std.math.clamp(cur + delta, 0, last)); 2162 if (next == @as(usize, @intCast(cur))) return; 2163 root_focus.setFocus(keys[next]); 2164 if (box.children.values()[next].rect) |rect| scroll.scrollToRect(rect); 2165 } 2166 2167 pub const FlowBox = struct { 2168 focus: *Focus, 2169 grid: ?Grid, 2170 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 2171 // backs each link item's `.custom` focus kind (e.g. "a:/user/foo"). reset 2172 // wholesale on each setItems so there's no per-string ownership to track. 2173 arena: std.heap.ArenaAllocator, 2174 // column count from the last build — FlowBox.Scroll.input uses it so arrow 2175 // up/down can step by a row's worth of items. 2176 last_cols: usize, 2177 options: Options, 2178 2179 const border_rows: usize = 2; 2180 2181 pub const Options = struct { 2182 cell_width: usize = 40, 2183 cell_height: usize = 3, 2184 }; 2185 2186 pub fn init(allocator: std.mem.Allocator, options: Options) !FlowBox { 2187 return .{ 2188 .focus = try Focus.create(allocator, .container), 2189 .grid = null, 2190 .text_boxes = .empty, 2191 .arena = std.heap.ArenaAllocator.init(allocator), 2192 .last_cols = 1, 2193 .options = options, 2194 }; 2195 } 2196 2197 pub fn deinit(self: *FlowBox, allocator: std.mem.Allocator) void { 2198 self.focus.destroy(allocator); 2199 if (self.grid) |*grid| { 2200 grid.deinit(); 2201 self.grid = null; 2202 } 2203 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2204 self.text_boxes.deinit(allocator); 2205 self.arena.deinit(); 2206 } 2207 2208 // one flow item: its display text plus an optional link. a non-empty `link` 2209 // sets the item's focus kind such as `.{ .custom = "a:/user/foo" }`, which 2210 // the web renderer turns into an anchor. 2211 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 2212 2213 // the text box copies the item text; links are copied into the arena, so the 2214 // caller's slices needn't outlive this call. 2215 pub fn setItems(self: *FlowBox, allocator: std.mem.Allocator, items: []const Item) !void { 2216 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2217 self.text_boxes.clearAndFree(allocator); 2218 2219 // the old text boxes and their borrowed links are gone now, so the link 2220 // arena can be reclaimed. 2221 _ = self.arena.reset(.retain_capacity); 2222 const aa = self.arena.allocator(); 2223 2224 self.focus.clear(); 2225 self.focus.child_id = null; 2226 2227 for (items) |item| { 2228 var text_box = try wgt.TextBox(Widget).init(allocator, item.text, .{ .border_style = .hidden, .rounded_corners = true, .wrap_kind = .word }); 2229 errdefer text_box.deinit(allocator); 2230 text_box.getFocus().focusable = true; 2231 2232 if (item.link.len > 0) { 2233 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 2234 } 2235 2236 try self.text_boxes.append(allocator, text_box); 2237 } 2238 2239 if (self.text_boxes.items.len > 0) { 2240 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2241 } 2242 } 2243 2244 pub fn build(self: *FlowBox, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2245 self.clearGrid(); 2246 self.focus.clear(); 2247 2248 const cell_width = self.options.cell_width; 2249 const max_width = constraint.max_size.width orelse cell_width; 2250 const cols = if (cell_width == 0) 1 else @max(1, max_width / cell_width); 2251 self.last_cols = cols; 2252 2253 const count = self.text_boxes.items.len; 2254 if (count == 0) return; 2255 const slot_height = self.options.cell_height + border_rows; 2256 if (slot_height == 0) return; 2257 2258 // build at the slot size so every text box fits a single grid cell 2259 for (self.text_boxes.items) |*tb| { 2260 tb.options.border_style = if (self.focus.child_id == tb.getFocus().id) .single else .hidden; 2261 try tb.build(allocator, .{ 2262 .min_size = .{ .width = cell_width, .height = null }, 2263 .max_size = .{ .width = cell_width, .height = slot_height }, 2264 }, root_focus); 2265 } 2266 2267 const rows = (count + cols - 1) / cols; 2268 const content_height = rows * slot_height; 2269 const total_width = cols * cell_width; 2270 if (total_width == 0 or content_height == 0) return; 2271 2272 var grid = try Grid.init(allocator, .{ .width = total_width, .height = content_height }); 2273 errdefer grid.deinit(); 2274 2275 for (self.text_boxes.items, 0..) |*tb, i| { 2276 const tb_grid = tb.getGrid() orelse continue; 2277 const col = i % cols; 2278 const row = i / cols; 2279 const cell_x = col * cell_width; 2280 const cell_y = row * slot_height; 2281 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, cell_x, cell_y); 2282 try grid.drawGrid(tb_grid, cell_x, cell_y); 2283 } 2284 2285 self.grid = grid; 2286 } 2287 2288 pub fn input(self: *FlowBox, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2289 _ = self; 2290 _ = allocator; 2291 _ = key; 2292 _ = root_focus; 2293 } 2294 2295 pub fn clearGrid(self: *FlowBox) void { 2296 if (self.grid) |*grid| { 2297 grid.deinit(); 2298 self.grid = null; 2299 } 2300 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2301 } 2302 2303 pub fn getGrid(self: FlowBox) ?Grid { 2304 return self.grid; 2305 } 2306 2307 pub fn getFocus(self: *FlowBox) *Focus { 2308 return self.focus; 2309 } 2310 2311 pub fn cellRect(self: FlowBox, index: usize) ?layout.IRect { 2312 if (self.last_cols == 0 or index >= self.text_boxes.items.len) return null; 2313 const slot_height = self.options.cell_height + border_rows; 2314 const col = index % self.last_cols; 2315 const row = index / self.last_cols; 2316 return .{ 2317 .x = @intCast(col * self.options.cell_width), 2318 .y = @intCast(row * slot_height), 2319 .size = .{ .width = self.options.cell_width, .height = slot_height }, 2320 }; 2321 } 2322 2323 pub fn indexOfFocusId(self: FlowBox, focus_id: usize) ?usize { 2324 for (self.text_boxes.items, 0..) |tb, i| { 2325 if (tb.box.focus.id == focus_id) return i; 2326 } 2327 return null; 2328 } 2329 2330 pub const Scroll = struct { 2331 scroll: wgt.Scroll(Widget), 2332 2333 pub fn init(allocator: std.mem.Allocator, options: FlowBox.Options, web_native: bool) !Scroll { 2334 var layout_inner = try FlowBox.init(allocator, options); 2335 errdefer layout_inner.deinit(allocator); 2336 var scroll = try wgt.Scroll(Widget).init(allocator, .{ .flow_box = layout_inner }, .{ .direction = .vert, .web_native = web_native }); 2337 errdefer scroll.deinit(allocator); 2338 return .{ .scroll = scroll }; 2339 } 2340 2341 pub fn deinit(self: *Scroll, allocator: std.mem.Allocator) void { 2342 self.scroll.deinit(allocator); 2343 } 2344 2345 pub fn setItems(self: *Scroll, allocator: std.mem.Allocator, items: []const Item) !void { 2346 self.scroll.x = 0; 2347 self.scroll.y = 0; 2348 try self.inner().setItems(allocator, items); 2349 } 2350 2351 pub fn build(self: *Scroll, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2352 try self.scroll.build(allocator, constraint, root_focus); 2353 } 2354 2355 pub fn input(self: *Scroll, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2356 _ = allocator; 2357 const in = self.inner(); 2358 const child_id = in.focus.child_id orelse return; 2359 const current_index = in.indexOfFocusId(child_id) orelse return; 2360 const count = in.text_boxes.items.len; 2361 if (count == 0) return; 2362 const cols = in.last_cols; 2363 const slot_height = in.options.cell_height + FlowBox.border_rows; 2364 2365 var index = current_index; 2366 switch (key) { 2367 .arrow_up => index -|= cols, 2368 .arrow_down => if (index + cols < count) { 2369 index += cols; 2370 }, 2371 .arrow_left => index -|= 1, 2372 .arrow_right => if (index + 1 < count) { 2373 index += 1; 2374 }, 2375 .home => index = 0, 2376 .end => index = count - 1, 2377 .page_up => { 2378 if (self.scroll.grid) |grid| if (slot_height > 0) { 2379 const rows_per_page = grid.size.height / slot_height; 2380 index -|= rows_per_page * cols; 2381 }; 2382 }, 2383 .page_down => { 2384 if (self.scroll.grid) |grid| if (slot_height > 0) { 2385 const rows_per_page = grid.size.height / slot_height; 2386 index = @min(index + rows_per_page * cols, count - 1); 2387 }; 2388 }, 2389 // scroll wheel moves the focused cell by a full row so the 2390 // viewport (via scrollToRect) follows in row-sized steps, 2391 // matching how a scroll wheel feels in a grid view. 2392 .mouse => |mouse| switch (mouse.action) { 2393 .scroll => |dir| switch (dir) { 2394 .up => index -|= cols, 2395 .down => if (index + cols < count) { 2396 index += cols; 2397 }, 2398 }, 2399 else => {}, 2400 }, 2401 else => {}, 2402 } 2403 2404 if (index != current_index) { 2405 root_focus.setFocus(in.text_boxes.items[index].getFocus().id); 2406 if (in.cellRect(index)) |rect| { 2407 self.scroll.scrollToRect(rect); 2408 } 2409 } 2410 } 2411 2412 pub fn clearGrid(self: *Scroll) void { 2413 self.scroll.clearGrid(); 2414 } 2415 2416 pub fn getGrid(self: Scroll) ?Grid { 2417 return self.scroll.getGrid(); 2418 } 2419 2420 pub fn getFocus(self: *Scroll) *Focus { 2421 return self.scroll.getFocus(); 2422 } 2423 2424 pub fn getSelectedIndex(self: Scroll) ?usize { 2425 const in = self.scroll.child.flow_box; 2426 const child_id = in.focus.child_id orelse return null; 2427 return in.indexOfFocusId(child_id); 2428 } 2429 2430 fn inner(self: *Scroll) *FlowBox { 2431 return &self.scroll.child.flow_box; 2432 } 2433 }; 2434 }; 2435 2436 // a left-to-right flow of variable-width focusable items that wraps at the 2437 // available width, like words in a paragraph. unlike FlowBox there is no cell 2438 // grid: each item is as wide as its text. selection movement is driven by the 2439 // owning view via indexOfFocusId/verticalNeighbor. 2440 pub const TagFlow = struct { 2441 focus: *Focus, 2442 grid: ?Grid, 2443 text_boxes: std.ArrayList(wgt.TextBox(Widget)), 2444 // last build's item rects (content space), for vertical navigation and 2445 // scroll-into-view. 2446 rects: std.ArrayList(layout.IRect), 2447 // backs each link item's `.custom` focus kind. 2448 arena: std.heap.ArenaAllocator, 2449 2450 pub const Item = struct { text: []const u8, link: []const u8 = "" }; 2451 2452 pub fn init(allocator: std.mem.Allocator) !TagFlow { 2453 return .{ 2454 .focus = try Focus.create(allocator, .container), 2455 .grid = null, 2456 .text_boxes = .empty, 2457 .rects = .empty, 2458 .arena = std.heap.ArenaAllocator.init(allocator), 2459 }; 2460 } 2461 2462 pub fn deinit(self: *TagFlow, allocator: std.mem.Allocator) void { 2463 self.focus.destroy(allocator); 2464 if (self.grid) |*grid| { 2465 grid.deinit(); 2466 self.grid = null; 2467 } 2468 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2469 self.text_boxes.deinit(allocator); 2470 self.rects.deinit(allocator); 2471 self.arena.deinit(); 2472 } 2473 2474 // the text box copies the item text; links are copied into the arena, so the 2475 // caller's slices needn't outlive this call. 2476 pub fn setItems(self: *TagFlow, allocator: std.mem.Allocator, items: []const Item) !void { 2477 for (self.text_boxes.items) |*tb| tb.deinit(allocator); 2478 self.text_boxes.clearAndFree(allocator); 2479 2480 _ = self.arena.reset(.retain_capacity); 2481 const aa = self.arena.allocator(); 2482 2483 self.focus.clear(); 2484 self.focus.child_id = null; 2485 2486 for (items) |item| { 2487 var text_box = try wgt.TextBox(Widget).init(allocator, item.text, .{ .border_style = .single, .rounded_corners = true, .wrap_kind = .none }); 2488 errdefer text_box.deinit(allocator); 2489 text_box.getFocus().focusable = true; 2490 2491 if (item.link.len > 0) { 2492 text_box.getFocus().kind = .{ .custom = try aa.dupe(u8, item.link) }; 2493 } 2494 2495 try self.text_boxes.append(allocator, text_box); 2496 } 2497 2498 if (self.text_boxes.items.len > 0) { 2499 self.focus.child_id = self.text_boxes.items[0].getFocus().id; 2500 } 2501 } 2502 2503 pub fn build(self: *TagFlow, allocator: std.mem.Allocator, constraint: layout.Constraint, root_focus: *Focus) !void { 2504 self.clearGrid(); 2505 self.focus.clear(); 2506 2507 if (self.text_boxes.items.len == 0) return; 2508 const max_width = constraint.max_size.width orelse 80; 2509 if (max_width == 0) return; 2510 2511 // lay the items out left to right, wrapping to a new row when the next 2512 // one wouldn't fit. 2513 self.rects.clearRetainingCapacity(); 2514 var x: usize = 0; 2515 var y: usize = 0; 2516 var row_height: usize = 0; 2517 var total_width: usize = 0; 2518 for (self.text_boxes.items) |*tb| { 2519 try tb.build(allocator, .{ 2520 .min_size = .{ .width = null, .height = null }, 2521 .max_size = .{ .width = max_width, .height = null }, 2522 }, root_focus); 2523 const tb_grid_maybe = tb.getGrid(); 2524 const w: usize = if (tb_grid_maybe) |g| g.size.width else 0; 2525 const h: usize = if (tb_grid_maybe) |g| g.size.height else 0; 2526 if (x > 0 and x + w > max_width) { 2527 x = 0; 2528 y += row_height; 2529 row_height = 0; 2530 } 2531 try self.rects.append(allocator, .{ .x = @intCast(x), .y = @intCast(y), .size = .{ .width = w, .height = h } }); 2532 if (h > row_height) row_height = h; 2533 x += w; 2534 if (x > total_width) total_width = x; 2535 } 2536 2537 const total_height = y + row_height; 2538 if (total_width == 0 or total_height == 0) return; 2539 2540 var grid = try Grid.init(allocator, .{ .width = total_width, .height = total_height }); 2541 errdefer grid.deinit(); 2542 2543 for (self.text_boxes.items, self.rects.items) |*tb, rect| { 2544 const tb_grid = tb.getGrid() orelse continue; 2545 try self.focus.addChild(allocator, tb.getFocus(), tb_grid.size, @intCast(rect.x), @intCast(rect.y)); 2546 try grid.drawGrid(tb_grid, @intCast(rect.x), @intCast(rect.y)); 2547 } 2548 2549 self.grid = grid; 2550 } 2551 2552 pub fn input(self: *TagFlow, allocator: std.mem.Allocator, key: Key, root_focus: *Focus) !void { 2553 _ = self; 2554 _ = allocator; 2555 _ = key; 2556 _ = root_focus; 2557 } 2558 2559 pub fn clearGrid(self: *TagFlow) void { 2560 if (self.grid) |*grid| { 2561 grid.deinit(); 2562 self.grid = null; 2563 } 2564 for (self.text_boxes.items) |*tb| tb.clearGrid(); 2565 } 2566 2567 pub fn getGrid(self: TagFlow) ?Grid { 2568 return self.grid; 2569 } 2570 2571 pub fn getFocus(self: *TagFlow) *Focus { 2572 return self.focus; 2573 } 2574 2575 pub fn indexOfFocusId(self: TagFlow, focus_id: usize) ?usize { 2576 for (self.text_boxes.items, 0..) |tb, i| { 2577 if (tb.box.focus.id == focus_id) return i; 2578 } 2579 return null; 2580 } 2581 2582 // the first item of the row below (when `downward`) or above, or null at 2583 // the flow's edge. items are laid out in order, so y is nondecreasing. 2584 pub fn rowStep(self: TagFlow, index: usize, downward: bool) ?usize { 2585 const rects = self.rects.items; 2586 if (index >= rects.len) return null; 2587 const cur_y = rects[index].y; 2588 if (downward) { 2589 for (rects[index + 1 ..], index + 1..) |r, i| { 2590 if (r.y > cur_y) return i; 2591 } 2592 return null; 2593 } 2594 // walk the earlier rows; the last one visited is the row above. 2595 var prev_first: ?usize = null; 2596 var i: usize = 0; 2597 while (i < rects.len and rects[i].y < cur_y) { 2598 prev_first = i; 2599 const y = rects[i].y; 2600 while (i < rects.len and rects[i].y == y) i += 1; 2601 } 2602 return prev_first; 2603 } 2604 }; 2605 2606 // an invisible widget that fills the horizontal space granted by its parent. 2607 // used inside Box(horiz) with a min_size so the box reserves space for the 2608 // children that follow, pushing them to the right. 2609 pub const Spacer = struct { 2610 focus: *Focus, 2611 grid: ?Grid, 2612 2613 pub fn init(allocator: std.mem.Allocator) !Spacer { 2614 return .{ 2615 .focus = try Focus.create(allocator, .container), 2616 .grid = null, 2617 }; 2618 } 2619 2620 pub fn deinit(self: *Spacer, allocator: std.mem.Allocator) void { 2621 self.focus.destroy(allocator); 2622 if (self.grid) |*grid| { 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