Less layering

gen-wcwidth.py

@@ -555,6 +555,9 @@ def gen_wcwidth() -> None:
 
         p('\t\tdefault:\n\t\t\treturn 1;')
         p('\t}')
+        if for_go:
+            p('\t}')
+        else:
             p('\treturn 1;\n}')
 
     with create_header('kitty/wcwidth-std.h') as p, open('tools/tui/wcwidth-std.go', 'w') as gof:

tools/tui/loop.go

@@ -8,9 +8,33 @@ import (
 	"syscall"
 	"time"
 
+	"golang.org/x/sys/unix"
+
 	"kitty/tools/utils"
 )
 
+func read_ignoring_eintr(fd int, buf []byte) (int, error) {
+	n, err := unix.Read(fd, buf)
+	if err == unix.EINTR {
+		return 0, nil
+	}
+	if n == 0 {
+		return 0, io.EOF
+	}
+	return n, err
+}
+
+func write_ignoring_eintr(fd int, buf []byte) (int, error) {
+	n, err := unix.Write(fd, buf)
+	if err == unix.EINTR {
+		return 0, nil
+	}
+	if n == 0 {
+		return 0, io.EOF
+	}
+	return n, err
+}
+
 type Loop struct {
 	controlling_term   *tty.Term
 	terminal_options   TerminalStateOptions
@@ -228,18 +252,17 @@ func (self *Loop) Run() (err error) {
 		}
 		if selector.IsReadyToRead(tty_fd) {
 			read_buf = read_buf[:cap(read_buf)]
-			num_read, err := self.controlling_term.Read(read_buf)
+			num_read, err := read_ignoring_eintr(tty_fd, read_buf)
 			if err != nil {
 				return err
 			}
-			if num_read == 0 {
-				return io.EOF
-			}
+			if num_read > 0 {
 				err = self.escape_code_parser.Parse(read_buf[:num_read])
 				if err != nil {
 					return err
 				}
 			}
+		}
 		if selector.IsReadyToRead(int(signal_read_file.Fd())) {
 			signal_buf = signal_buf[:cap(signal_buf)]
 			err = self.read_signals(signal_read_file, signal_buf)
@@ -277,12 +300,12 @@ func (self *Loop) write_to_tty() error {
 	if len(self.write_buf) == 0 || self.controlling_term == nil {
 		return nil
 	}
-	n, err := self.controlling_term.Write(self.write_buf)
+	n, err := write_ignoring_eintr(self.controlling_term.Fd(), self.write_buf)
 	if err != nil {
 		return err
 	}
-	if n == 0 {
-		return io.EOF
+	if n <= 0 {
+		return nil
 	}
 	remainder := self.write_buf[n:]
 	if len(remainder) > 0 {

tools/tui/wcwidth-std.go

@@ -2892,7 +2892,6 @@ func Wcwidth(code rune) int {
 	default:
 		return 1
 	}
-	return 1
 }
 func IsEmojiPresentationBase(code rune) bool {
 	switch code {