IO thread has more state setup

src/Window.zig

@@ -456,6 +456,7 @@ pub fn create(alloc: Allocator, loop: libuv.Loop, config: *const Config) !*Windo
         .grid_size = grid_size,
         .screen_size = screen_size,
         .config = config,
+        .renderer_state = &self.renderer_state,
     });
     errdefer io.deinit(alloc);
 

src/renderer/State.zig

@@ -1,6 +1,7 @@
 //! This is the render state that is given to a renderer.
 
 const std = @import("std");
+const Allocator = std.mem.Allocator;
 const DevMode = @import("../DevMode.zig");
 const terminal = @import("../terminal/main.zig");
 const renderer = @import("../renderer.zig");

src/termio/Exec.zig

@@ -9,6 +9,7 @@ const Command = @import("../Command.zig");
 const Pty = @import("../Pty.zig");
 const terminal = @import("../terminal/main.zig");
 const libuv = @import("libuv");
+const renderer = @import("../renderer.zig");
 
 const log = std.log.scoped(.io_exec);
 
@@ -23,6 +24,13 @@ command: Command,
 /// just stores internal state about a grid.
 terminal: terminal.Terminal,
 
+/// The stream parser. This parses the stream of escape codes and so on
+/// from the child process and calls callbacks in the stream handler.
+terminal_stream: terminal.Stream(StreamHandler),
+
+/// The shared render state
+renderer_state: *renderer.State,
+
 /// Initialize the exec implementation. This will also start the child
 /// process.
 pub fn init(alloc: Allocator, opts: termio.Options) !Exec {
@@ -76,6 +84,8 @@ pub fn init(alloc: Allocator, opts: termio.Options) !Exec {
         .pty = pty,
         .command = cmd,
         .terminal = term,
+        .terminal_stream = undefined,
+        .renderer_state = opts.renderer_state,
     };
 }
 
@@ -86,15 +96,178 @@ pub fn deinit(self: *Exec, alloc: Allocator) void {
     _ = self.command.wait() catch |err|
         log.err("error waiting for command to exit: {}", .{err});
 
-    // Clean up the terminal state
+    // Clean up our other members
     self.terminal.deinit(alloc);
 }
 
-pub fn threadEnter(self: *Exec, loop: libuv.Loop) !void {
-    _ = self;
-    _ = loop;
+pub fn threadEnter(self: *Exec, loop: libuv.Loop) !ThreadData {
+    // Get a copy to our allocator
+    const alloc_ptr = loop.getData(Allocator).?;
+    const alloc = alloc_ptr.*;
+
+    // Setup our data that is used for callbacks
+    var ev_data_ptr = try alloc.create(EventData);
+    errdefer alloc.destroy(ev_data_ptr);
+
+    // Read data
+    var stream = try libuv.Tty.init(alloc, loop, self.pty.master);
+    errdefer stream.deinit(alloc);
+    stream.setData(ev_data_ptr);
+    try stream.readStart(ttyReadAlloc, ttyRead);
+
+    // Setup our event data before we start
+    ev_data_ptr.* = .{
+        .read_arena = std.heap.ArenaAllocator.init(alloc),
+        .renderer_state = self.renderer_state,
+        .data_stream = stream,
+        .terminal_stream = .{
+            .handler = .{
+                .terminal = &self.terminal,
+            },
+        },
+    };
+    errdefer ev_data_ptr.deinit();
+
+    // Return our data
+    return ThreadData{
+        .alloc = alloc,
+        .ev = ev_data_ptr,
+    };
 }
 
-pub fn threadExit(self: *Exec) void {
+pub fn threadExit(self: *Exec, data: ThreadData) void {
     _ = self;
+    _ = data;
 }
+
+const ThreadData = struct {
+    /// Allocator used for the event data
+    alloc: Allocator,
+
+    /// The data that is attached to the callbacks.
+    ev: *EventData,
+
+    pub fn deinit(self: *ThreadData) void {
+        self.ev.deinit();
+        self.alloc.destroy(self.ev);
+        self.* = undefined;
+    }
+};
+
+const EventData = struct {
+    /// This is the arena allocator used for IO read buffers. Since we use
+    /// libuv under the covers, this lets us rarely heap allocate since we're
+    /// usually just reusing buffers from this.
+    read_arena: std.heap.ArenaAllocator,
+
+    /// The stream parser. This parses the stream of escape codes and so on
+    /// from the child process and calls callbacks in the stream handler.
+    terminal_stream: terminal.Stream(StreamHandler),
+
+    /// The shared render state
+    renderer_state: *renderer.State,
+
+    /// The data stream is the main IO for the pty.
+    data_stream: libuv.Tty,
+
+    pub fn deinit(self: *EventData) void {
+        self.read_arena.deinit();
+
+        // Stop our data stream
+        self.data_stream.readStop();
+        self.data_stream.close((struct {
+            fn callback(h: *libuv.Tty) void {
+                const handle_alloc = h.loop().getData(Allocator).?.*;
+                h.deinit(handle_alloc);
+            }
+        }).callback);
+    }
+};
+
+fn ttyReadAlloc(t: *libuv.Tty, size: usize) ?[]u8 {
+    const ev = t.getData(EventData) orelse return null;
+    const alloc = ev.read_arena.allocator();
+    return alloc.alloc(u8, size) catch null;
+}
+
+fn ttyRead(t: *libuv.Tty, n: isize, buf: []const u8) void {
+    const ev = t.getData(EventData).?;
+    defer {
+        const alloc = ev.read_arena.allocator();
+        alloc.free(buf);
+    }
+
+    // log.info("DATA: {d}", .{n});
+    // log.info("DATA: {any}", .{buf[0..@intCast(usize, n)]});
+
+    // First check for errors in the case n is less than 0.
+    libuv.convertError(@intCast(i32, n)) catch |err| {
+        switch (err) {
+            // ignore EOF because it should end the process.
+            libuv.Error.EOF => {},
+            else => log.err("read error: {}", .{err}),
+        }
+
+        return;
+    };
+
+    // We are modifying terminal state from here on out
+    ev.renderer_state.mutex.lock();
+    defer ev.renderer_state.mutex.unlock();
+
+    // Whenever a character is typed, we ensure the cursor is in the
+    // non-blink state so it is rendered if visible.
+    ev.renderer_state.cursor.blink = false;
+    // TODO
+    // if (win.terminal_cursor.timer.isActive() catch false) {
+    //     _ = win.terminal_cursor.timer.again() catch null;
+    // }
+
+    // Schedule a render
+    // TODO
+    //win.queueRender() catch unreachable;
+
+    // Process the terminal data. This is an extremely hot part of the
+    // terminal emulator, so we do some abstraction leakage to avoid
+    // function calls and unnecessary logic.
+    //
+    // The ground state is the only state that we can see and print/execute
+    // ASCII, so we only execute this hot path if we're already in the ground
+    // state.
+    //
+    // Empirically, this alone improved throughput of large text output by ~20%.
+    var i: usize = 0;
+    const end = @intCast(usize, n);
+    // TODO: re-enable this
+    if (ev.terminal_stream.parser.state == .ground and false) {
+        for (buf[i..end]) |c| {
+            switch (terminal.parse_table.table[c][@enumToInt(terminal.Parser.State.ground)].action) {
+                // Print, call directly.
+                .print => ev.print(@intCast(u21, c)) catch |err|
+                    log.err("error processing terminal data: {}", .{err}),
+
+                // C0 execute, let our stream handle this one but otherwise
+                // continue since we're guaranteed to be back in ground.
+                .execute => ev.terminal_stream.execute(c) catch |err|
+                    log.err("error processing terminal data: {}", .{err}),
+
+                // Otherwise, break out and go the slow path until we're
+                // back in ground. There is a slight optimization here where
+                // could try to find the next transition to ground but when
+                // I implemented that it didn't materially change performance.
+                else => break,
+            }
+
+            i += 1;
+        }
+    }
+
+    if (i < end) {
+        ev.terminal_stream.nextSlice(buf[i..end]) catch |err|
+            log.err("error processing terminal data: {}", .{err});
+    }
+}
+
+const StreamHandler = struct {
+    terminal: *terminal.Terminal,
+};

src/termio/Options.zig

@@ -11,3 +11,9 @@ screen_size: renderer.ScreenSize,
 
 /// The app configuration.
 config: *const Config,
+
+/// The render state. The IO implementation can modify anything here. The
+/// window thread will setup the initial "terminal" pointer but the IO impl
+/// is free to change that if that is useful (i.e. doing some sort of dual
+/// terminal implementation.)
+renderer_state: *renderer.State,

src/termio/Thread.zig

@@ -113,8 +113,9 @@ pub fn threadMain(self: *Thread) void {
 fn threadMain_(self: *Thread) !void {
     // Run our thread start/end callbacks. This allows the implementation
     // to hook into the event loop as needed.
-    try self.impl.threadEnter(self.loop);
-    defer self.impl.threadExit();
+    var data = try self.impl.threadEnter(self.loop);
+    defer data.deinit();
+    defer self.impl.threadExit(data);
 
     // Set up our async handler to support rendering
     self.wakeup.setData(self);