repl: bugfix: slow paste into terminal window.

* stream.c (stream_init): When stdin is a TTY, we make it
unbuffered. This affects the parenthesis matching and
incomplete line warning flash in the listener, in the
following way. The listener uses the poll function to execute
delays which is canceled by the presence of TTY input. This
logic breaks when data is pasted into the terminal, because
the stdin stream buffers the input.

1 files changed, 3 insertions, 1 deletions

diff --git a/stream.c b/stream.c
index 3887e77f..69c891bf 100644
--- a/stream.c
+++ b/stream.c
@@ -4533,8 +4533,10 @@ void stream_init(void)
   reg_var(print_circle_s = intern(lit("*print-circle*"), user_package), nil);
 
 #if HAVE_ISATTY
-  if (isatty(fileno(stdin)) == 1)
+  if (isatty(fileno(stdin)) == 1) {
     stream_set_prop(std_input, real_time_k, t);
+    setbuf(stdin, 0);
+  }
 #endif
 
   reg_fun(format_s, func_n2v(formatv));