wip: macos

disabled by default, aio/coro might not be that mature yet.
however, appreciated if people give it a go and report issues.

build.zig

@@ -4,11 +4,13 @@ pub fn build(b: *std.Build) void {
     const include_libxev = b.option(bool, "libxev", "Enable support for libxev library (default: true)") orelse true;
     const include_images = b.option(bool, "images", "Enable support for images (default: true)") orelse true;
     const include_text_input = b.option(bool, "text_input", "Enable support for the TextInput widget (default: true)") orelse true;
+    const include_aio = b.option(bool, "aio", "Enable support for zig-aio library (default: false)") orelse false;
 
     const options = b.addOptions();
     options.addOption(bool, "libxev", include_libxev);
     options.addOption(bool, "images", include_images);
     options.addOption(bool, "text_input", include_text_input);
+    options.addOption(bool, "aio", include_aio);
 
     const options_mod = options.createModule();
 
@@ -33,6 +35,10 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
         .target = target,
     }) else null;
+    const aio_dep = if (include_aio) b.lazyDependency("aio", .{
+        .optimize = optimize,
+        .target = target,
+    }) else null;
 
     // Module
     const vaxis_mod = b.addModule("vaxis", .{
@@ -46,6 +52,8 @@ pub fn build(b: *std.Build) void {
     if (zigimg_dep) |dep| vaxis_mod.addImport("zigimg", dep.module("zigimg"));
     if (gap_buffer_dep) |dep| vaxis_mod.addImport("gap_buffer", dep.module("gap_buffer"));
     if (xev_dep) |dep| vaxis_mod.addImport("xev", dep.module("xev"));
+    if (aio_dep) |dep| vaxis_mod.addImport("aio", dep.module("aio"));
+    if (aio_dep) |dep| vaxis_mod.addImport("coro", dep.module("coro"));
     vaxis_mod.addImport("build_options", options_mod);
 
     // Examples
@@ -59,6 +67,7 @@ pub fn build(b: *std.Build) void {
         vaxis,
         vt,
         xev,
+        aio,
     };
     const example_option = b.option(Example, "example", "Example to run (default: text_input)") orelse .text_input;
     const example_step = b.step("example", "Run example");
@@ -73,6 +82,8 @@ pub fn build(b: *std.Build) void {
     });
     example.root_module.addImport("vaxis", vaxis_mod);
     if (xev_dep) |dep| example.root_module.addImport("xev", dep.module("xev"));
+    if (aio_dep) |dep| example.root_module.addImport("aio", dep.module("aio"));
+    if (aio_dep) |dep| example.root_module.addImport("coro", dep.module("coro"));
 
     const example_run = b.addRunArtifact(example);
     example_step.dependOn(&example_run.step);

build.zig.zon

@@ -22,6 +22,11 @@
             .hash = "12207b7a5b538ffb7fb18f954ae17d2f8490b6e3778a9e30564ad82c58ee8da52361",
             .lazy = true,
         },
+        .aio = .{
+            .url = "git+https://github.com/Cloudef/zig-aio#be8e2b374bf223202090e282447fa4581029c2eb",
+            .hash = "122012a11b37a350395a32fdb514e57ff54a0f9d8d4ce09498b6c45ffb7211232920",
+            .lazy = true,
+        },
     },
     .paths = .{
         "LICENSE",

examples/aio.zig

@@ -0,0 +1,171 @@
+const builtin = @import("builtin");
+const std = @import("std");
+const vaxis = @import("vaxis");
+const aio = @import("aio");
+const coro = @import("coro");
+
+pub const panic = vaxis.panic_handler;
+
+const Event = union(enum) {
+    key_press: vaxis.Key,
+    winsize: vaxis.Winsize,
+};
+
+const Loop = vaxis.aio.Loop(Event);
+
+const Video = enum { no_state, ready, end };
+const Audio = enum { no_state, ready, end };
+
+fn downloadTask(allocator: std.mem.Allocator, url: []const u8) ![]const u8 {
+    var client: std.http.Client = .{ .allocator = allocator };
+    defer client.deinit();
+    var body = std.ArrayList(u8).init(allocator);
+    _ = try client.fetch(.{
+        .location = .{ .url = url },
+        .response_storage = .{ .dynamic = &body },
+        .max_append_size = 1.6e+7,
+    });
+    return try body.toOwnedSlice();
+}
+
+fn audioTask(allocator: std.mem.Allocator) !void {
+    errdefer coro.yield(Audio.end) catch {};
+
+    // var child = std.process.Child.init(&.{ "aplay", "-Dplug:default", "-q", "-f", "S16_LE", "-r", "8000" }, allocator);
+    var child = std.process.Child.init(&.{ "mpv", "--audio-samplerate=16000", "--audio-channels=mono", "--audio-format=s16", "-" }, allocator);
+    child.stdin_behavior = .Pipe;
+    child.stdout_behavior = .Ignore;
+    child.stderr_behavior = .Ignore;
+    child.spawn() catch return; // no sound
+    defer _ = child.kill() catch {};
+
+    const sound = blk: {
+        var tpool: coro.ThreadPool = .{};
+        try tpool.start(allocator, 1);
+        defer tpool.deinit();
+        break :blk try tpool.yieldForCompletition(downloadTask, .{ allocator, "https://keroserene.net/lol/roll.s16" });
+    };
+    defer allocator.free(sound);
+
+    try coro.yield(Audio.ready);
+
+    var audio_off: usize = 0;
+    while (audio_off < sound.len) {
+        var written: usize = 0;
+        try coro.io.single(aio.Write{ .file = child.stdin.?, .buffer = sound[audio_off..], .out_written = &written });
+        audio_off += written;
+    }
+
+    // the audio is already fed to the player and the defer
+    // would kill the child stay here chilling
+    coro.yield(Audio.end) catch {};
+}
+
+fn videoTask(writer: std.io.AnyWriter) !void {
+    defer coro.yield(Video.end) catch {};
+
+    var socket: std.posix.socket_t = undefined;
+    try coro.io.single(aio.Socket{
+        .domain = std.posix.AF.INET,
+        .flags = std.posix.SOCK.STREAM | std.posix.SOCK.CLOEXEC,
+        .protocol = std.posix.IPPROTO.TCP,
+        .out_socket = &socket,
+    });
+    defer std.posix.close(socket);
+
+    const address = std.net.Address.initIp4(.{ 44, 224, 41, 160 }, 1987);
+    try coro.io.single(aio.Connect{
+        .socket = socket,
+        .addr = &address.any,
+        .addrlen = address.getOsSockLen(),
+    });
+
+    try coro.yield(Video.ready);
+
+    var buf: [1024]u8 = undefined;
+    while (true) {
+        var read: usize = 0;
+        try coro.io.single(aio.Recv{ .socket = socket, .buffer = &buf, .out_read = &read });
+        if (read == 0) break;
+        _ = try writer.write(buf[0..read]);
+    }
+}
+
+fn loadingTask(vx: *vaxis.Vaxis, writer: std.io.AnyWriter) !void {
+    var color_idx: u8 = 30;
+    var dir: enum { up, down } = .up;
+
+    while (true) {
+        try coro.io.single(aio.Timeout{ .ns = 8 * std.time.ns_per_ms });
+
+        const style: vaxis.Style = .{ .fg = .{ .rgb = [_]u8{ color_idx, color_idx, color_idx } } };
+        const segment: vaxis.Segment = .{ .text = vaxis.logo, .style = style };
+
+        const win = vx.window();
+        win.clear();
+
+        var loc = vaxis.widgets.alignment.center(win, 28, 4);
+        _ = try loc.printSegment(segment, .{ .wrap = .grapheme });
+
+        switch (dir) {
+            .up => {
+                color_idx += 1;
+                if (color_idx == 255) dir = .down;
+            },
+            .down => {
+                color_idx -= 1;
+                if (color_idx == 30) dir = .up;
+            },
+        }
+
+        try vx.render(writer);
+    }
+}
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    var tty = try vaxis.Tty.init();
+    defer tty.deinit();
+
+    var vx = try vaxis.init(allocator, .{});
+    defer vx.deinit(allocator, tty.anyWriter());
+
+    var scheduler = try coro.Scheduler.init(allocator, .{});
+    defer scheduler.deinit();
+
+    var loop = try Loop.init();
+    try loop.spawn(&scheduler, &vx, &tty, null, .{});
+    defer loop.deinit(&vx, &tty);
+
+    try vx.enterAltScreen(tty.anyWriter());
+    try vx.queryTerminalSend(tty.anyWriter());
+
+    var buffered_tty_writer = tty.bufferedWriter();
+    const loading = try scheduler.spawn(loadingTask, .{ &vx, buffered_tty_writer.writer().any() }, .{});
+    const audio = try scheduler.spawn(audioTask, .{allocator}, .{});
+    const video = try scheduler.spawn(videoTask, .{buffered_tty_writer.writer().any()}, .{});
+
+    main: while (try scheduler.tick(.blocking) > 0) {
+        while (try loop.popEvent()) |event| switch (event) {
+            .key_press => |key| {
+                if (key.matches('c', .{ .ctrl = true })) {
+                    break :main;
+                }
+            },
+            .winsize => |ws| try vx.resize(allocator, buffered_tty_writer.writer().any(), ws),
+        };
+
+        if (audio.state(Video) == .ready and video.state(Audio) == .ready) {
+            loading.cancel();
+            audio.wakeup();
+            video.wakeup();
+        } else if (audio.state(Audio) == .end and video.state(Video) == .end) {
+            break :main;
+        }
+
+        try buffered_tty_writer.flush();
+    }
+}

examples/vt.zig

@@ -61,9 +61,11 @@ pub fn main() !void {
 
     var redraw: bool = false;
     while (true) {
+        std.debug.print("inside while loop before resize\n", .{});
         std.time.sleep(8 * std.time.ns_per_ms);
         // try vt events first
         while (vt.tryEvent()) |event| {
+            std.debug.print("inside stryEventloop \n", .{});
             redraw = true;
             switch (event) {
                 .bell => {},
@@ -74,6 +76,7 @@ pub fn main() !void {
             }
         }
         while (loop.tryEvent()) |event| {
+            std.debug.print("inside loop.tryEvent\n", .{});
             redraw = true;
             switch (event) {
                 .key_press => |key| {

log.lg

@@ -0,0 +1,172 @@
+info(loop): pixel mouse capability detected
+info(loop): unicode capability detected
+info(loop): color_scheme_updates capability detected
+info(loop): kitty keyboard capability detected
+info(loop): kitty graphics capability detected
+slave name: /dev/ttys008
+posix opened : /dev/ttys008
+set size done
+inside spawnwe are not child: 56928
+inside while loop before resize
+inside run
+inside while loop
+inside loop.tryEvent
+debug(vaxis): resizing screen: width=81 height=49
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
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+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
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+inside while loop before resize
+inside while loop before resize
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+inside while loop before resize
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+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside loop.tryEvent
+before switch event
+inside print event
+inside while loop
+inside while loop before resize
+inside stryEventloop 
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside loop.tryEvent
+before switch event
+inside print event
+inside while loop
+inside while loop before resize
+inside stryEventloop 
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
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+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside loop.tryEvent
+before switch event
+inside handlec0
+inside while loop
+before switch event
+inside handlec0
+inside while loop
+inside while loop before resize
+inside stryEventloop 
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside loop.tryEvent
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside while loop before resize
+inside loop.tryEvent
+before switch event
+inside handlec0
+debug(vaxis): total renders = 8
+debug(vaxis): microseconds per render = 1393

src/Vaxis.zig

@@ -704,18 +704,6 @@ pub fn translateMouse(self: Vaxis, mouse: Mouse) Mouse {
         result.row = ypos / ycell;
         result.xoffset = xpos % xcell;
         result.yoffset = ypos % ycell;
-        log.debug("translateMouse x/ypos:{d}/{d} cell:{d}/{d} xtra:{d}/{d} col/rol:{d}/{d} x/y:{d}/{d}", .{
-            xpos,           ypos,
-            xcell,          ycell,
-            xextra,         yextra,
-            result.col,     result.row,
-            result.xoffset, result.yoffset,
-        });
-    } else {
-        log.debug("translateMouse col/rol:{d}/{d} x/y:{d}/{d}", .{
-            result.col,     result.row,
-            result.xoffset, result.yoffset,
-        });
     }
     return result;
 }

src/Window.zig

@@ -182,8 +182,8 @@ pub fn child(self: Window, opts: ChildOptions) Window {
     const y_off: usize = if (loc.top) 1 else 0;
     const h_delt: usize = if (loc.bottom) 1 else 0;
     const w_delt: usize = if (loc.right) 1 else 0;
-    const h_ch: usize = h - y_off - h_delt;
+    const h_ch: usize = h -| y_off -| h_delt;
-    const w_ch: usize = w - x_off - w_delt;
+    const w_ch: usize = w -| x_off -| w_delt;
     return result.initChild(x_off, y_off, .{ .limit = w_ch }, .{ .limit = h_ch });
 }
 
@@ -256,6 +256,8 @@ pub fn setCursorShape(self: Window, shape: Cell.CursorShape) void {
 pub const PrintOptions = struct {
     /// vertical offset to start printing at
     row_offset: usize = 0,
+    /// horizontal offset to start printing at
+    col_offset: usize = 0,
 
     /// wrap behavior for printing
     wrap: enum {
@@ -285,7 +287,7 @@ pub fn print(self: Window, segments: []const Segment, opts: PrintOptions) !Print
     var row = opts.row_offset;
     switch (opts.wrap) {
         .grapheme => {
-            var col: usize = 0;
+            var col: usize = opts.col_offset;
             const overflow: bool = blk: for (segments) |segment| {
                 var iter = self.screen.unicode.graphemeIterator(segment.text);
                 while (iter.next()) |grapheme| {
@@ -324,95 +326,78 @@ pub fn print(self: Window, segments: []const Segment, opts: PrintOptions) !Print
             };
         },
         .word => {
-            var col: usize = 0;
+            var col: usize = opts.col_offset;
             var overflow: bool = false;
             var soft_wrapped: bool = false;
-            for (segments) |segment| {
+            outer: for (segments) |segment| {
-                var start: usize = 0;
+                var line_iter: LineIterator = .{ .buf = segment.text };
-                var i: usize = 0;
+                while (line_iter.next()) |line| {
-                while (i < segment.text.len) : (i += 1) {
+                    defer {
-                    // for (segment.text, 0..) |b, i| {
+                        // We only set soft_wrapped to false if a segment actually contains a linebreak
-                    const b = segment.text[i];
+                        if (line_iter.has_break) {
-                    const end = switch (b) {
+                            soft_wrapped = false;
-                        ' ',
-                        '\r',
-                        '\n',
-                        => i,
-                        else => if (i != segment.text.len - 1) continue else i + 1,
-                    };
-                    const word = segment.text[start..end];
-                    // find the start of the next word
-                    start = while (i + 1 < segment.text.len) : (i += 1) {
-                        if (segment.text[i + 1] == ' ') continue;
-                        break i + 1;
-                    } else i;
-                    const width = self.gwidth(word);
-                    const non_wsp_width: usize = for (word, 0..) |wb, wi| {
-                        if (wb == '\r' or wb == '\n') {
                             row += 1;
                             col = 0;
-                            break width -| wi -| 1;
                         }
-                        if (wb != ' ') break width - wi;
-                    } else 0;
-
-                    if (width + col > self.width and non_wsp_width < self.width) {
-                        // wrap
-                        row += 1;
-                        col = 0;
-                        soft_wrapped = true;
                     }
-                    if (row >= self.height) {
+                    var iter: WhitespaceTokenizer = .{ .buf = line };
-                        overflow = true;
+                    while (iter.next()) |token| {
-                        break;
+                        switch (token) {
-                    }
+                            .whitespace => |len| {
-                    // if we are soft wrapped, (col == 0 and row > 0), then trim
+                                if (soft_wrapped) continue;
-                    // leading spaces
+                                for (0..len) |_| {
-                    const printed_word = if (soft_wrapped)
+                                    if (col >= self.width) {
-                        std.mem.trimLeft(u8, word, " ")
+                                        col = 0;
-                    else
+                                        row += 1;
-                        word;
+                                        break;
-                    defer soft_wrapped = false;
+                                    }
-                    var iter = self.screen.unicode.graphemeIterator(printed_word);
+                                    if (opts.commit) {
-                    while (iter.next()) |grapheme| {
+                                        self.writeCell(col, row, .{
-                        const s = grapheme.bytes(printed_word);
+                                            .char = .{
-                        const w = self.gwidth(s);
+                                                .grapheme = " ",
-                        if (opts.commit) self.writeCell(col, row, .{
+                                                .width = 1,
-                            .char = .{
+                                            },
-                                .grapheme = s,
+                                            .style = segment.style,
-                                .width = w,
+                                            .link = segment.link,
+                                        });
+                                    }
+                                    col += 1;
+                                }
+                            },
+                            .word => |word| {
+                                const width = self.gwidth(word);
+                                if (width + col > self.width and width < self.width) {
+                                    row += 1;
+                                    col = 0;
+                                }
+
+                                var grapheme_iterator = self.screen.unicode.graphemeIterator(word);
+                                while (grapheme_iterator.next()) |grapheme| {
+                                    soft_wrapped = false;
+                                    if (row >= self.height) {
+                                        overflow = true;
+                                        break :outer;
+                                    }
+                                    const s = grapheme.bytes(word);
+                                    const w = self.gwidth(s);
+                                    if (opts.commit) self.writeCell(col, row, .{
+                                        .char = .{
+                                            .grapheme = s,
+                                            .width = w,
+                                        },
+                                        .style = segment.style,
+                                        .link = segment.link,
+                                    });
+                                    col += w;
+                                    if (col >= self.width) {
+                                        row += 1;
+                                        col = 0;
+                                        soft_wrapped = true;
+                                    }
+                                }
                             },
-                            .style = segment.style,
-                            .link = segment.link,
-                        });
-                        col += w;
-                        if (col >= self.width) {
-                            row += 1;
-                            col = 0;
                         }
                     }
-                    switch (b) {
-                        ' ' => {
-                            if (col > 0) {
-                                if (opts.commit) self.writeCell(col, row, .{
-                                    .char = .{
-                                        .grapheme = " ",
-                                        .width = 1,
-                                    },
-                                    .style = segment.style,
-                                    .link = segment.link,
-                                });
-                                col += 1;
-                            }
-                        },
-                        '\r',
-                        '\n',
-                        => {
-                            col = 0;
-                            row += 1;
-                        },
-                        else => {},
-                    }
                 }
             }
             return .{
@@ -423,7 +408,7 @@ pub fn print(self: Window, segments: []const Segment, opts: PrintOptions) !Print
             };
         },
         .none => {
-            var col: usize = 0;
+            var col: usize = opts.col_offset;
             const overflow: bool = blk: for (segments) |segment| {
                 var iter = self.screen.unicode.graphemeIterator(segment.text);
                 while (iter.next()) |grapheme| {
@@ -636,6 +621,24 @@ test "print: word" {
         try std.testing.expectEqual(0, result.row);
         try std.testing.expectEqual(false, result.overflow);
     }
+    {
+        var segments = [_]Segment{
+            .{ .text = " " },
+        };
+        const result = try win.print(&segments, opts);
+        try std.testing.expectEqual(1, result.col);
+        try std.testing.expectEqual(0, result.row);
+        try std.testing.expectEqual(false, result.overflow);
+    }
+    {
+        var segments = [_]Segment{
+            .{ .text = " a" },
+        };
+        const result = try win.print(&segments, opts);
+        try std.testing.expectEqual(2, result.col);
+        try std.testing.expectEqual(0, result.row);
+        try std.testing.expectEqual(false, result.overflow);
+    }
     {
         var segments = [_]Segment{
             .{ .text = "a b" },
@@ -749,4 +752,104 @@ test "print: word" {
         try std.testing.expectEqual(1, result.row);
         try std.testing.expectEqual(false, result.overflow);
     }
+    {
+        var segments = [_]Segment{
+            .{ .text = "note" },
+            .{ .text = " now" },
+        };
+        const result = try win.print(&segments, opts);
+        try std.testing.expectEqual(3, result.col);
+        try std.testing.expectEqual(1, result.row);
+        try std.testing.expectEqual(false, result.overflow);
+    }
+    {
+        var segments = [_]Segment{
+            .{ .text = "note " },
+            .{ .text = "now" },
+        };
+        const result = try win.print(&segments, opts);
+        try std.testing.expectEqual(3, result.col);
+        try std.testing.expectEqual(1, result.row);
+        try std.testing.expectEqual(false, result.overflow);
+    }
 }
+
+/// Iterates a slice of bytes by linebreaks. Lines are split by '\r', '\n', or '\r\n'
+const LineIterator = struct {
+    buf: []const u8,
+    index: usize = 0,
+    has_break: bool = true,
+
+    fn next(self: *LineIterator) ?[]const u8 {
+        if (self.index >= self.buf.len) return null;
+
+        const start = self.index;
+        const end = std.mem.indexOfAnyPos(u8, self.buf, self.index, "\r\n") orelse {
+            if (start == 0) self.has_break = false;
+            self.index = self.buf.len;
+            return self.buf[start..];
+        };
+
+        self.index = end;
+        self.consumeCR();
+        self.consumeLF();
+        return self.buf[start..end];
+    }
+
+    // consumes a \n byte
+    fn consumeLF(self: *LineIterator) void {
+        if (self.index >= self.buf.len) return;
+        if (self.buf[self.index] == '\n') self.index += 1;
+    }
+
+    // consumes a \r byte
+    fn consumeCR(self: *LineIterator) void {
+        if (self.index >= self.buf.len) return;
+        if (self.buf[self.index] == '\r') self.index += 1;
+    }
+};
+
+/// Returns tokens of text and whitespace
+const WhitespaceTokenizer = struct {
+    buf: []const u8,
+    index: usize = 0,
+
+    const Token = union(enum) {
+        // the length of whitespace. Tab = 8
+        whitespace: usize,
+        word: []const u8,
+    };
+
+    fn next(self: *WhitespaceTokenizer) ?Token {
+        if (self.index >= self.buf.len) return null;
+        const Mode = enum {
+            whitespace,
+            word,
+        };
+        const first = self.buf[self.index];
+        const mode: Mode = if (first == ' ' or first == '\t') .whitespace else .word;
+        switch (mode) {
+            .whitespace => {
+                var len: usize = 0;
+                while (self.index < self.buf.len) : (self.index += 1) {
+                    switch (self.buf[self.index]) {
+                        ' ' => len += 1,
+                        '\t' => len += 8,
+                        else => break,
+                    }
+                }
+                return .{ .whitespace = len };
+            },
+            .word => {
+                const start = self.index;
+                while (self.index < self.buf.len) : (self.index += 1) {
+                    switch (self.buf[self.index]) {
+                        ' ', '\t' => break,
+                        else => {},
+                    }
+                }
+                return .{ .word = self.buf[start..self.index] };
+            },
+        }
+    }
+};

src/aio.zig

@@ -0,0 +1,268 @@
+const builtin = @import("builtin");
+const std = @import("std");
+const aio = @import("aio");
+const coro = @import("coro");
+const vaxis = @import("main.zig");
+const log = std.log.scoped(.vaxis_aio);
+
+comptime {
+    if (builtin.target.os.tag == .windows) {
+        @compileError("Windows is not supported right now");
+    }
+}
+
+const Yield = enum { no_state, took_event };
+
+/// zig-aio based event loop
+/// <https://github.com/Cloudef/zig-aio>
+pub fn Loop(comptime T: type) type {
+    return struct {
+        const Event = T;
+
+        winsize_task: ?coro.Task.Generic2(winsizeTask) = null,
+        reader_task: ?coro.Task.Generic2(ttyReaderTask) = null,
+        queue: std.BoundedArray(T, 512) = .{},
+        source: aio.EventSource,
+        fatal: bool = false,
+
+        pub fn init() !@This() {
+            return .{ .source = try aio.EventSource.init() };
+        }
+
+        pub fn deinit(self: *@This(), vx: *vaxis.Vaxis, tty: *vaxis.Tty) void {
+            vx.deviceStatusReport(tty.anyWriter()) catch {};
+            if (self.winsize_task) |task| task.cancel();
+            if (self.reader_task) |task| task.cancel();
+            self.source.deinit();
+            self.* = undefined;
+        }
+
+        fn winsizeInner(self: *@This(), tty: *vaxis.Tty) !void {
+            const Context = struct {
+                loop: *@TypeOf(self.*),
+                tty: *vaxis.Tty,
+                winsize: ?vaxis.Winsize = null,
+                fn cb(ptr: *anyopaque) void {
+                    std.debug.assert(coro.current() == null);
+                    const ctx: *@This() = @ptrCast(@alignCast(ptr));
+                    ctx.winsize = vaxis.Tty.getWinsize(ctx.tty.fd) catch return;
+                    ctx.loop.source.notify();
+                }
+            };
+
+            // keep on stack
+            var ctx: Context = .{ .loop = self, .tty = tty };
+            if (@hasField(Event, "winsize")) {
+                const handler: vaxis.Tty.SignalHandler = .{ .context = &ctx, .callback = Context.cb };
+                try vaxis.Tty.notifyWinsize(handler);
+            }
+
+            while (true) {
+                try coro.io.single(aio.WaitEventSource{ .source = &self.source });
+                if (ctx.winsize) |winsize| {
+                    if (!@hasField(Event, "winsize")) unreachable;
+                    ctx.loop.postEvent(.{ .winsize = winsize }) catch {};
+                    ctx.winsize = null;
+                }
+            }
+        }
+
+        fn winsizeTask(self: *@This(), tty: *vaxis.Tty) void {
+            self.winsizeInner(tty) catch |err| {
+                if (err != error.Canceled) log.err("winsize: {}", .{err});
+                self.fatal = true;
+            };
+        }
+
+        fn ttyReaderInner(self: *@This(), vx: *vaxis.Vaxis, tty: *vaxis.Tty, paste_allocator: ?std.mem.Allocator) !void {
+            // initialize a grapheme cache
+            var cache: vaxis.GraphemeCache = .{};
+
+            // get our initial winsize
+            const winsize = try vaxis.Tty.getWinsize(tty.fd);
+            if (@hasField(Event, "winsize")) {
+                try self.postEvent(.{ .winsize = winsize });
+            }
+
+            var parser: vaxis.Parser = .{
+                .grapheme_data = &vx.unicode.grapheme_data,
+            };
+
+            const file: std.fs.File = .{ .handle = tty.fd };
+            while (true) {
+                var buf: [4096]u8 = undefined;
+                var n: usize = undefined;
+                var read_start: usize = 0;
+                try coro.io.single(aio.Read{ .file = file, .buffer = buf[read_start..], .out_read = &n });
+                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_start = 0;
+                    seq_start += result.n;
+
+                    const event = result.event orelse continue;
+                    switch (event) {
+                        .key_press => |key| {
+                            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);
+                                }
+                                try 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);
+                                }
+                                try self.postEvent(.{ .key_release = mut_key });
+                            }
+                        },
+                        .mouse => |mouse| {
+                            if (@hasField(Event, "mouse")) {
+                                try self.postEvent(.{ .mouse = vx.translateMouse(mouse) });
+                            }
+                        },
+                        .focus_in => {
+                            if (@hasField(Event, "focus_in")) {
+                                try self.postEvent(.focus_in);
+                            }
+                        },
+                        .focus_out => {
+                            if (@hasField(Event, "focus_out")) {
+                                try self.postEvent(.focus_out);
+                            }
+                        },
+                        .paste_start => {
+                            if (@hasField(Event, "paste_start")) {
+                                try self.postEvent(.paste_start);
+                            }
+                        },
+                        .paste_end => {
+                            if (@hasField(Event, "paste_end")) {
+                                try self.postEvent(.paste_end);
+                            }
+                        },
+                        .paste => |text| {
+                            if (@hasField(Event, "paste")) {
+                                try self.postEvent(.{ .paste = text });
+                            } else {
+                                if (paste_allocator) |_|
+                                    paste_allocator.?.free(text);
+                            }
+                        },
+                        .color_report => |report| {
+                            if (@hasField(Event, "color_report")) {
+                                try self.postEvent(.{ .color_report = report });
+                            }
+                        },
+                        .color_scheme => |scheme| {
+                            if (@hasField(Event, "color_scheme")) {
+                                try 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_da1 => {
+                            std.Thread.Futex.wake(&vx.query_futex, 10);
+                        },
+                        .winsize => unreachable, // handled elsewhere for posix
+                    }
+                }
+            }
+        }
+
+        fn ttyReaderTask(self: *@This(), vx: *vaxis.Vaxis, tty: *vaxis.Tty, paste_allocator: ?std.mem.Allocator) void {
+            self.ttyReaderInner(vx, tty, paste_allocator) catch |err| {
+                if (err != error.Canceled) log.err("ttyReader: {}", .{err});
+                self.fatal = true;
+            };
+        }
+
+        /// Spawns tasks to handle winsize signal and tty
+        pub fn spawn(
+            self: *@This(),
+            scheduler: *coro.Scheduler,
+            vx: *vaxis.Vaxis,
+            tty: *vaxis.Tty,
+            paste_allocator: ?std.mem.Allocator,
+            spawn_options: coro.Scheduler.SpawnOptions,
+        ) coro.Scheduler.SpawnError!void {
+            if (self.reader_task) |_| unreachable; // programming error
+            // This is required even if app doesn't care about winsize
+            // It is because it consumes the EventSource, so it can wakeup the scheduler
+            // Without that custom `postEvent`'s wouldn't wake up the scheduler and UI wouldn't update
+            self.winsize_task = try scheduler.spawn(winsizeTask, .{ self, tty }, spawn_options);
+            self.reader_task = try scheduler.spawn(ttyReaderTask, .{ self, vx, tty, paste_allocator }, spawn_options);
+        }
+
+        pub const PopEventError = error{TtyCommunicationSevered};
+
+        /// Call this in a while loop in the main event handler until it returns null
+        pub fn popEvent(self: *@This()) PopEventError!?T {
+            if (self.fatal) return error.TtyCommunicationSevered;
+            defer self.winsize_task.?.wakeupIf(Yield.took_event);
+            defer self.reader_task.?.wakeupIf(Yield.took_event);
+            return self.queue.popOrNull();
+        }
+
+        pub const PostEventError = error{Overflow};
+
+        pub fn postEvent(self: *@This(), event: T) !void {
+            if (coro.current()) |_| {
+                while (true) {
+                    self.queue.insert(0, event) catch {
+                        // wait for the app to take event
+                        try coro.yield(Yield.took_event);
+                        continue;
+                    };
+                    break;
+                }
+            } else {
+                // queue can be full, app could handle this error by spinning the scheduler
+                try self.queue.insert(0, event);
+            }
+            // wakes up the scheduler, so custom events update UI
+            self.source.notify();
+        }
+    };
+}

src/main.zig

@@ -6,6 +6,7 @@ pub const Vaxis = @import("Vaxis.zig");
 
 pub const Loop = @import("Loop.zig").Loop;
 pub const xev = @import("xev.zig");
+pub const aio = @import("aio.zig");
 
 pub const Queue = @import("queue.zig").Queue;
 pub const Key = @import("Key.zig");

src/widgets/Scrollbar.zig

@@ -25,8 +25,7 @@ pub fn draw(self: Scrollbar, win: vaxis.Window) void {
     // don't draw when all items can be shown
     if (self.view_size >= self.total) return;
 
-    var bar_height = self.view_size * win.height / self.total;
+    const bar_height = @max(std.math.divCeil(usize, self.view_size * win.height, self.total) catch unreachable, 1);
-    if (bar_height < 0) bar_height = 1;
     const bar_top = self.top * win.height / self.total;
     var i: usize = 0;
     while (i < bar_height) : (i += 1)

src/widgets/terminal/Command.zig

@@ -17,6 +17,22 @@ pid: ?std.posix.pid_t = null,
 env_map: *const std.process.EnvMap,
 
 pty: Pty,
+const TIOCSCTTY = if (builtin.os.tag == .macos) 536900705 else c.TIOCSCTTY;
+const TIOCSWINSZ = if (builtin.os.tag == .macos) 2148037735 else c.TIOCSWINSZ;
+const TIOCGWINSZ = if (builtin.os.tag == .macos) 1074295912 else c.TIOCGWINSZ;
+extern "c" fn setsid() std.c.pid_t;
+const c = struct {
+    usingnamespace switch (builtin.os.tag) {
+        .macos => @cImport({
+            @cInclude("sys/ioctl.h"); // ioctl and constants
+            @cInclude("util.h"); // openpty()
+        }),
+        else => @cImport({
+            @cInclude("sys/ioctl.h"); // ioctl and constants
+            @cInclude("pty.h");
+        }),
+    };
+};
 
 pub fn spawn(self: *Command, allocator: std.mem.Allocator) !void {
     var arena_allocator = std.heap.ArenaAllocator.init(allocator);
@@ -33,10 +49,12 @@ pub fn spawn(self: *Command, allocator: std.mem.Allocator) !void {
     if (pid == 0) {
         // we are the child
         _ = std.os.linux.setsid();
+        _ = setsid();
+        // if (setsid() < 0) return error.ProcessGroupFailed;
 
         // set the controlling terminal
         var u: c_uint = std.posix.STDIN_FILENO;
-        if (posix.system.ioctl(self.pty.tty, posix.T.IOCSCTTY, @intFromPtr(&u)) != 0) return error.IoctlError;
+        if (c.ioctl(self.pty.tty, TIOCSCTTY, @intFromPtr(&u)) != 0) return error.IoctlError;
 
         // set up io
         try posix.dup2(self.pty.tty, std.posix.STDIN_FILENO);
@@ -53,6 +71,10 @@ pub fn spawn(self: *Command, allocator: std.mem.Allocator) !void {
         // exec
         const err = std.posix.execvpeZ(argv_buf.ptr[0].?, argv_buf.ptr, envp);
         _ = err catch {};
+    } else {
+        std.debug.print("we are not child: {d}\n", .{pid});
+        // posix.close(self.pty.tty);
+        _ = posix.waitpid(pid, 0);
     }
 
     // we are the parent

src/widgets/terminal/Pty.zig

@@ -7,6 +7,25 @@ const Winsize = @import("../../main.zig").Winsize;
 
 const posix = std.posix;
 
+extern "c" fn setsid() std.c.pid_t;
+
+const c = struct {
+    usingnamespace switch (builtin.os.tag) {
+        .macos => @cImport({
+            @cInclude("sys/ioctl.h"); // ioctl and constants
+            @cInclude("util.h"); // openpty()
+        }),
+        else => @cImport({
+            @cInclude("sys/ioctl.h"); // ioctl and constants
+            @cInclude("pty.h");
+        }),
+    };
+};
+
+const TIOCSCTTY = if (builtin.os.tag == .macos) 536900705 else c.TIOCSCTTY;
+const TIOCSWINSZ = if (builtin.os.tag == .macos) 2148037735 else c.TIOCSWINSZ;
+const TIOCGWINSZ = if (builtin.os.tag == .macos) 1074295912 else c.TIOCGWINSZ;
+
 pty: posix.fd_t,
 tty: posix.fd_t,
 
@@ -14,6 +33,7 @@ tty: posix.fd_t,
 pub fn init() !Pty {
     switch (builtin.os.tag) {
         .linux => return openPtyLinux(),
+        .macos => return openPtyMacos2(),
         else => @compileError("unsupported os"),
     }
 }
@@ -32,10 +52,75 @@ pub fn setSize(self: Pty, ws: Winsize) !void {
         .ws_xpixel = @truncate(ws.x_pixel),
         .ws_ypixel = @truncate(ws.y_pixel),
     };
-    if (posix.system.ioctl(self.pty, posix.T.IOCSWINSZ, @intFromPtr(&_ws)) != 0)
+    if (c.ioctl(self.pty, TIOCSWINSZ, @intFromPtr(&_ws)) != 0)
         return error.SetWinsizeError;
 }
 
+fn openPtyMacos2() !Pty {
+    const p = try posix.open("/dev/ptmx", .{ .ACCMODE = .RDWR, .NOCTTY = true }, 0);
+    errdefer posix.close(p);
+
+    // unlockpt
+    // var n: c_uint = 0;
+    if (c.ioctl(p, c.TIOCPTYUNLK) != 0) return error.IoctlError;
+
+    // ptsname
+    if (c.ioctl(p, c.TIOCPTYGRANT) != 0) return error.IoctlError;
+
+    var buf: [128]u8 = undefined;
+    // var buf2: [128]u8 = undefined;
+    if (c.ioctl(p, c.TIOCPTYGNAME, &buf) != 0) return error.IoctlError;
+    const sname = buf[0 .. 13 - 1];
+    // std.debug.print("sizeof buf: {d}", .{buf.len});
+    // const sname = try std.fmt.bufPrint(&buf2, "{s}", .{buf});
+    std.debug.print("slave name: {s}\n", .{sname});
+    // const sname = try std.fmt.bufPrint(&buf, "/dev/pts/{d}", .{n});
+    // std.log.err("pts: {s}", .{sname});
+
+    const t = try posix.open(sname, .{ .ACCMODE = .RDWR, .NOCTTY = true }, 0);
+    std.debug.print("posix opened : {s}\n", .{sname});
+
+    var attrs: c.termios = undefined;
+    if (c.tcgetattr(p, &attrs) != 0)
+        return error.OpenptyFailed;
+    attrs.c_iflag |= c.IUTF8;
+    if (c.tcsetattr(p, c.TCSANOW, &attrs) != 0)
+        return error.OpenptyFailed;
+
+    return .{
+        .pty = p,
+        .tty = t,
+    };
+}
+
+fn openPtyMacos() !Pty {
+    var master_fd: posix.fd_t = undefined;
+    var slave_fd: posix.fd_t = undefined;
+    if (c.openpty(
+        &master_fd,
+        &slave_fd,
+        null,
+        null,
+        null,
+    ) < 0)
+        return error.OpenptyFailed;
+    errdefer {
+        _ = posix.system.close(master_fd);
+        _ = posix.system.close(slave_fd);
+    }
+    var attrs: c.termios = undefined;
+    if (c.tcgetattr(master_fd, &attrs) != 0)
+        return error.OpenptyFailed;
+    attrs.c_iflag |= c.IUTF8;
+    if (c.tcsetattr(master_fd, c.TCSANOW, &attrs) != 0)
+        return error.OpenptyFailed;
+
+    return .{
+        .pty = master_fd,
+        .tty = slave_fd,
+    };
+}
+
 fn openPtyLinux() !Pty {
     const p = try posix.open("/dev/ptmx", .{ .ACCMODE = .RDWR, .NOCTTY = true }, 0);
     errdefer posix.close(p);

src/widgets/terminal/Terminal.zig

@@ -96,6 +96,7 @@ pub fn init(
 ) !Terminal {
     const pty = try Pty.init();
     try pty.setSize(opts.winsize);
+    std.debug.print("set size done\n", .{});
     const cmd: Command = .{
         .argv = argv,
         .env_map = env,
@@ -155,6 +156,7 @@ pub fn deinit(self: *Terminal) void {
 }
 
 pub fn spawn(self: *Terminal) !void {
+    std.debug.print("inside spawn", .{});
     if (self.thread != null) return;
     self.back_screen = &self.back_screen_pri;
 
@@ -259,6 +261,7 @@ fn anyReader(self: *const Terminal) std.io.AnyReader {
 
 /// process the output from the command on the pty
 fn run(self: *Terminal) !void {
+    std.debug.print("inside run\n", .{});
     var parser: Parser = .{
         .buf = try std.ArrayList(u8).initCapacity(self.allocator, 128),
     };
@@ -268,6 +271,7 @@ fn run(self: *Terminal) !void {
     var reader = std.io.bufferedReader(self.anyReader());
 
     while (!self.should_quit) {
+        std.debug.print("inside while loop\n", .{});
         const event = try parser.parseReader(&reader);
         self.back_mutex.lock();
         defer self.back_mutex.unlock();
@@ -275,8 +279,10 @@ fn run(self: *Terminal) !void {
         if (!self.dirty and self.event_queue.tryPush(.redraw))
             self.dirty = true;
 
+        std.debug.print("before switch event\n", .{});
         switch (event) {
             .print => |str| {
+                std.debug.print("inside print event\n", .{});
                 var iter = grapheme.Iterator.init(str, &self.unicode.grapheme_data);
                 while (iter.next()) |g| {
                     const gr = g.bytes(str);
@@ -287,6 +293,7 @@ fn run(self: *Terminal) !void {
             },
             .c0 => |b| try self.handleC0(b),
             .escape => |esc| {
+                std.debug.print("inside escape event\n", .{});
                 const final = esc[esc.len - 1];
                 switch (final) {
                     'B' => {}, // TODO: handle charsets
@@ -700,6 +707,7 @@ fn run(self: *Terminal) !void {
 }
 
 inline fn handleC0(self: *Terminal, b: ansi.C0) !void {
+    std.debug.print("inside handlec0\n", .{});
     switch (b) {
         .NUL, .SOH, .STX => {},
         .EOT => {}, // we send EOT to quit the read thread
@@ -716,6 +724,7 @@ inline fn handleC0(self: *Terminal, b: ansi.C0) !void {
 }
 
 pub fn setMode(self: *Terminal, mode: u16, val: bool) void {
+    std.debug.print("inside setmode\n", .{});
     switch (mode) {
         7 => self.mode.autowrap = val,
         25 => self.mode.cursor = val,

src/widgets/terminal/log.lg

@@ -0,0 +1,5 @@
+info(loop): pixel mouse capability detected
+info(loop): unicode capability detected
+info(loop): color_scheme_updates capability detected
+info(loop): kitty keyboard capability detected
+info(loop): kitty graphics capability detected

src/windows/Tty.zig

@@ -379,8 +379,8 @@ pub fn nextEvent(self: *Tty) !Event {
                     return windows.unexpectedError(windows.kernel32.GetLastError());
                 }
                 const window_rect = console_info.srWindow;
-                const width = window_rect.Right - window_rect.Left;
+                const width = window_rect.Right - window_rect.Left + 1;
-                const height = window_rect.Bottom - window_rect.Top;
+                const height = window_rect.Bottom - window_rect.Top + 1;
                 return .{
                     .winsize = .{
                         .cols = @intCast(width),