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const GraphemeCache = @import("GraphemeCache.zig");const Parser = @import("Parser.zig");const Queue = @import("queue.zig").Queue;const vaxis = @import("main.zig");const Tty = vaxis.Tty;const Vaxis = @import("Vaxis.zig");
const log = std.log.scoped(.vaxis);
pub fn Loop(comptime T: type) type { return struct { const Self = @This();
const Event = T;
tty: *Tty, vaxis: *Vaxis,
queue: Queue(T, 512) = .{}, thread: ?std.Thread = null, should_quit: bool = false,
/// Initialize the event loop. This is an intrusive init so that we have /// a stable pointer to register signal callbacks with posix TTYs pub fn init(self: *Self) !void { switch (builtin.os.tag) { .windows => {}, else => { if (!builtin.is_test) { const handler: Tty.SignalHandler = .{ .context = self, .callback = Self.winsizeCallback, }; try Tty.notifyWinsize(handler); } }, } }
/// spawns the input thread to read input from the tty pub fn start(self: *Self) !void { if (self.thread) |_| return; self.thread = try std.Thread.spawn(.{}, Self.ttyRun, .{ self, self.vaxis.opts.system_clipboard_allocator, }); }
/// stops reading from the tty. pub fn stop(self: *Self) void { // If we don't have a thread, we have nothing to stop if (self.thread == null) return; self.should_quit = true; // trigger a read self.vaxis.deviceStatusReport(self.tty.writer()) catch {};
if (self.thread) |thread| { thread.join(); self.thread = null; self.should_quit = false; } }
/// returns the next available event, blocking until one is available pub fn nextEvent(self: *Self) T { return self.queue.pop(); }
/// blocks until an event is available. Useful when your application is /// operating on a poll + drain architecture (see tryEvent) pub fn pollEvent(self: *Self) void { self.queue.poll(); }
/// returns an event if one is available, otherwise null. Non-blocking. pub fn tryEvent(self: *Self) ?T { return self.queue.tryPop(); }
/// posts an event into the event queue. Will block if there is not /// capacity for the event pub fn postEvent(self: *Self, event: T) void { self.queue.push(event); }
pub fn tryPostEvent(self: *Self, event: T) bool { return self.queue.tryPush(event); }
pub fn winsizeCallback(ptr: *anyopaque) void { const self: *Self = @ptrCast(@alignCast(ptr)); // We will be receiving winsize updates in-band if (self.vaxis.state.in_band_resize) return;
const winsize = Tty.getWinsize(self.tty.fd) catch return; if (@hasField(Event, "winsize")) { self.postEvent(.{ .winsize = winsize }); } }
/// read input from the tty. This is run in a separate thread fn ttyRun( self: *Self, paste_allocator: ?std.mem.Allocator, ) !void { // Return early if we're in test mode to avoid infinite loops if (builtin.is_test) return;
// initialize a grapheme cache var cache: GraphemeCache = .{};
switch (builtin.os.tag) { .windows => { var parser: Parser = .{}; while (!self.should_quit) { const event = try self.tty.nextEvent(&parser, paste_allocator); try handleEventGeneric(self, self.vaxis, &cache, Event, event, null); } }, else => { // get our initial winsize const winsize = try Tty.getWinsize(self.tty.fd); if (@hasField(Event, "winsize")) { self.postEvent(.{ .winsize = winsize }); }
var parser: Parser = .{};
// initialize the read buffer var buf: [1024]u8 = undefined; var read_start: usize = 0; // read loop read_loop: while (!self.should_quit) { const n = try self.tty.read(buf[read_start..]); var seq_start: usize = 0; while (seq_start < n) { const result = try parser.parse(buf[seq_start..n], paste_allocator); if (result.n == 0) { // copy the read to the beginning. We don't use memcpy because // this could be overlapping, and it's also rare const initial_start = seq_start; while (seq_start < n) : (seq_start += 1) { buf[seq_start - initial_start] = buf[seq_start]; } read_start = seq_start - initial_start + 1; continue :read_loop; } read_start = 0; seq_start += result.n;
const event = result.event orelse continue; try handleEventGeneric(self, self.vaxis, &cache, Event, event, paste_allocator); } } }, } } };}
// Use return on the self.postEvent's so it can either return error union or voidpub fn handleEventGeneric(self: anytype, vx: *Vaxis, cache: *GraphemeCache, Event: type, event: anytype, paste_allocator: ?std.mem.Allocator) !void { switch (builtin.os.tag) { .windows => { switch (event) { .winsize => |ws| { if (@hasField(Event, "winsize")) { return self.postEvent(.{ .winsize = ws }); } }, .key_press => |key| { // Check for a cursor position response for our explicit width query. This will // always be an F3 key with shift = true, and we must be looking for queries if (key.codepoint == vaxis.Key.f3 and key.mods.shift and !vx.queries_done.load(.unordered)) { log.info("explicit width capability detected", .{}); vx.caps.explicit_width = true; vx.caps.unicode = .unicode; vx.screen.width_method = .unicode; return; } // Check for a cursor position response for our scaled text query. This will // always be an F3 key with alt = true, and we must be looking for queries if (key.codepoint == vaxis.Key.f3 and key.mods.alt and !vx.queries_done.load(.unordered)) { log.info("scaled text capability detected", .{}); vx.caps.scaled_text = true; return; } if (@hasField(Event, "key_press")) { // HACK: yuck. there has to be a better way var mut_key = key; if (key.text) |text| { mut_key.text = cache.put(text); } return self.postEvent(.{ .key_press = mut_key }); } }, .key_release => |key| { if (@hasField(Event, "key_release")) { // HACK: yuck. there has to be a better way var mut_key = key; if (key.text) |text| { mut_key.text = cache.put(text); } return self.postEvent(.{ .key_release = mut_key }); } }, .cap_da1 => { std.Thread.Futex.wake(&vx.query_futex, 10); vx.queries_done.store(true, .unordered); }, .mouse => |mouse| { if (@hasField(Event, "mouse")) { return self.postEvent(.{ .mouse = vx.translateMouse(mouse) }); } }, .focus_in => { if (@hasField(Event, "focus_in")) { return self.postEvent(.focus_in); } }, .focus_out => { if (@hasField(Event, "focus_out")) { return self.postEvent(.focus_out); } }, // Unsupported currently else => {}, } }, else => { switch (event) { .key_press => |key| { // Check for a cursor position response for our explicity width query. This will // always be an F3 key with shift = true, and we must be looking for queries if (key.codepoint == vaxis.Key.f3 and key.mods.shift and !vx.queries_done.load(.unordered)) { log.info("explicit width capability detected", .{}); vx.caps.explicit_width = true; vx.caps.unicode = .unicode; vx.screen.width_method = .unicode; return; } // Check for a cursor position response for our scaled text query. This will // always be an F3 key with alt = true, and we must be looking for queries if (key.codepoint == vaxis.Key.f3 and key.mods.alt and !vx.queries_done.load(.unordered)) { log.info("scaled text capability detected", .{}); vx.caps.scaled_text = true; return; } if (@hasField(Event, "key_press")) { // HACK: yuck. there has to be a better way var mut_key = key; if (key.text) |text| { mut_key.text = cache.put(text); } return self.postEvent(.{ .key_press = mut_key }); } }, .key_release => |key| { if (@hasField(Event, "key_release")) { // HACK: yuck. there has to be a better way var mut_key = key; if (key.text) |text| { mut_key.text = cache.put(text); } return self.postEvent(.{ .key_release = mut_key }); } }, .mouse => |mouse| { if (@hasField(Event, "mouse")) { return self.postEvent(.{ .mouse = vx.translateMouse(mouse) }); } }, .mouse_leave => { if (@hasField(Event, "mouse_leave")) { return self.postEvent(.mouse_leave); } }, .focus_in => { if (@hasField(Event, "focus_in")) { return self.postEvent(.focus_in); } }, .focus_out => { if (@hasField(Event, "focus_out")) { return self.postEvent(.focus_out); } }, .paste_start => { if (@hasField(Event, "paste_start")) { return self.postEvent(.paste_start); } }, .paste_end => { if (@hasField(Event, "paste_end")) { return self.postEvent(.paste_end); } }, .paste => |text| { if (@hasField(Event, "paste")) { return self.postEvent(.{ .paste = text }); } else { if (paste_allocator) |_| paste_allocator.?.free(text); } }, .color_report => |report| { if (@hasField(Event, "color_report")) { return self.postEvent(.{ .color_report = report }); } }, .color_scheme => |scheme| { if (@hasField(Event, "color_scheme")) { return self.postEvent(.{ .color_scheme = scheme }); } }, .cap_kitty_keyboard => { log.info("kitty keyboard capability detected", .{}); vx.caps.kitty_keyboard = true; }, .cap_kitty_graphics => { if (!vx.caps.kitty_graphics) { log.info("kitty graphics capability detected", .{}); vx.caps.kitty_graphics = true; } }, .cap_rgb => { log.info("rgb capability detected", .{}); vx.caps.rgb = true; }, .cap_unicode => { log.info("unicode capability detected", .{}); vx.caps.unicode = .unicode; vx.screen.width_method = .unicode; }, .cap_sgr_pixels => { log.info("pixel mouse capability detected", .{}); vx.caps.sgr_pixels = true; }, .cap_color_scheme_updates => { log.info("color_scheme_updates capability detected", .{}); vx.caps.color_scheme_updates = true; }, .cap_multi_cursor => { log.info("multi cursor capability detected", .{}); vx.caps.multi_cursor = true; }, .cap_da1 => { std.Thread.Futex.wake(&vx.query_futex, 10); vx.queries_done.store(true, .unordered); }, .winsize => |winsize| { vx.state.in_band_resize = true; switch (builtin.os.tag) { .windows => {}, // Reset the signal handler if we are receiving in_band_resize else => Tty.resetSignalHandler(), } if (@hasField(Event, "winsize")) { return self.postEvent(.{ .winsize = winsize }); } }, } }, }}
test Loop { const Event = union(enum) { key_press: vaxis.Key, winsize: vaxis.Winsize, focus_in, foo: u8, };
var tty = try vaxis.Tty.init(&.{}); defer tty.deinit();
var vx = try vaxis.init(std.testing.allocator, .{}); defer vx.deinit(std.testing.allocator, tty.writer());
var loop: vaxis.Loop(Event) = .{ .tty = &tty, .vaxis = &vx }; try loop.init();
try loop.start(); defer loop.stop();
// Optionally enter the alternate screen try vx.enterAltScreen(tty.writer()); try vx.queryTerminal(tty.writer(), 1 * std.time.ns_per_ms);}