aio: update aio, add LoopWithModules

AFAIK zig lacks a way of overriding module dependencies of dependencies.
LoopWithModules lets you use aio backend with vaxis using aio and coro
modules that are not included by vaxis, when this function is used
`include_aio` is not neccessary.

build.zig.zon

@@ -23,8 +23,8 @@
             .lazy = true,
         },
         .aio = .{
-            .url = "git+https://github.com/Cloudef/zig-aio#407bb416136b61087cec2c561fa4b4103a44c5b1",
+            .url = "git+https://github.com/Cloudef/zig-aio#b5a407344379508466c5dcbe4c74438a6166e2ca",
-            .hash = "12202405ca6dd40f314dba6472983fcbb388118ab7446d75065b1efb982d03f515d2",
+            .hash = "1220a55aedabdd10578d0c514719ea39ae1bc6d7ed990f508dc100db7f0ccf391437",
             .lazy = true,
         },
     },

examples/aio.zig

@@ -29,6 +29,7 @@ fn downloadTask(allocator: std.mem.Allocator, url: []const u8) ![]const u8 {
 }
 
 fn audioTask(allocator: std.mem.Allocator) !void {
+    // signals end of audio in case there's a error
     errdefer coro.yield(Audio.end) catch {};
 
     // var child = std.process.Child.init(&.{ "aplay", "-Dplug:default", "-q", "-f", "S16_LE", "-r", "8000" }, allocator);
@@ -36,14 +37,13 @@ fn audioTask(allocator: std.mem.Allocator) !void {
     child.stdin_behavior = .Pipe;
     child.stdout_behavior = .Ignore;
     child.stderr_behavior = .Ignore;
-    child.spawn() catch return; // no sound
+    try child.spawn();
     defer _ = child.kill() catch {};
 
     const sound = blk: {
-        var tpool: coro.ThreadPool = .{};
+        var tpool = try coro.ThreadPool.init(allocator, .{});
-        try tpool.start(allocator, .{});
         defer tpool.deinit();
-        break :blk try tpool.yieldForCompletition(downloadTask, .{ allocator, "https://keroserene.net/lol/roll.s16" });
+        break :blk try tpool.yieldForCompletition(downloadTask, .{ allocator, "https://keroserene.net/lol/roll.s16" }, .{});
     };
     defer allocator.free(sound);
 
@@ -57,11 +57,12 @@ fn audioTask(allocator: std.mem.Allocator) !void {
     }
 
     // the audio is already fed to the player and the defer
-    // would kill the child stay here chilling
+    // would kill the child, so stay here chilling
     coro.yield(Audio.end) catch {};
 }
 
 fn videoTask(writer: std.io.AnyWriter) !void {
+    // signals end of video
     defer coro.yield(Video.end) catch {};
 
     var socket: std.posix.socket_t = undefined;

src/Loop.zig

@@ -164,6 +164,7 @@ pub fn Loop(comptime T: type) type {
     };
 }
 
+// Use return on the self.postEvent's so it can either return error union or void
 pub fn handleEventGeneric(self: anytype, vx: *Vaxis, cache: *GraphemeCache, Event: type, event: anytype, paste_allocator: ?std.mem.Allocator) !void {
     switch (builtin.os.tag) {
         .windows => {
@@ -298,7 +299,7 @@ pub fn handleEventGeneric(self: anytype, vx: *Vaxis, cache: *GraphemeCache, Even
                 .winsize => |winsize| {
                     vx.state.in_band_resize = true;
                     if (@hasField(Event, "winsize")) {
-                        self.postEvent(.{ .winsize = winsize });
+                        return self.postEvent(.{ .winsize = winsize });
                     }
                 },
             }

src/aio.zig

@@ -1,16 +1,25 @@
+const build_options = @import("build_options");
 const builtin = @import("builtin");
 const std = @import("std");
-const aio = @import("aio");
-const coro = @import("coro");
 const vaxis = @import("main.zig");
 const handleEventGeneric = @import("Loop.zig").handleEventGeneric;
 const log = std.log.scoped(.vaxis_aio);
 
 const Yield = enum { no_state, took_event };
 
+pub fn Loop(T: type) type {
+    if (!build_options.aio) {
+        @compileError(
+            \\build_options.aio is not enabled.
+            \\Use `LoopWithModules` instead to provide `aio` and `coro` modules from outside vaxis.
+        );
+    }
+    return LoopWithModules(T, @import("aio"), @import("coro"));
+}
+
 /// zig-aio based event loop
 /// <https://github.com/Cloudef/zig-aio>
-pub fn Loop(comptime T: type) type {
+pub fn LoopWithModules(T: type, aio: type, coro: type) type {
     return struct {
         const Event = T;