ExternalPrinter can't handle ASCII control character about rustyline HOT 5 OPEN

Raw mode is activated only while reading / readline(">>") is called. And deactivated when readline(">>") returns.
And some escape sequences are interpreted only in raw mode.
I guess replxx behaves the same.

from rustyline.

Same behavior with linefeed:

diff --git a/examples/demo.rs b/examples/demo.rs
index a7ad87c..4754cac 100644
--- a/examples/demo.rs
+++ b/examples/demo.rs
@@ -90,8 +90,8 @@ fn main() -> io::Result<()> {
                     let mut rng = thread_rng();
                     let mut i = 0usize;
                     loop {
-                        writeln!(iface, "[#{}] Concurrent message #{}",
-                            my_thread_id, i).unwrap();
+                        writeln!(iface, "test\x08\x08\x08",
+                            ).unwrap();
                         let wait_ms = rng.gen_range(1, 500);
                         thread::sleep(Duration::from_millis(wait_ms));
                         i += 1;

linefeed % cargo run --example demo
demo> spawn-log-thread
Spawning log thread #0
test
test
test
test
test
demo>
Goodbye.

But if I add one character like "test\x08\x08\x08!"
I get "t!st" with both rustyline and replxx...

from rustyline.

do we have any plan to add the feature that enable ASCII control character in external printer?
or maybe I just misunderstanding the usage of external printer. because it by design to print plain text info...

from rustyline.

To print plain or styled text

from rustyline.

tested with this bash script:
#!/bin/bash
input="./test.txt"
while IFS= read -r line
do
echo -e "$line"
done < "$input"

test.txt is just one line:
test\b\b\b!

yield (as rustyline):
t!st

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