When the data is large, the copy data cannot be render.

[driftluo]

use repo example debug：

Write 4100 log：

[2019-08-05T08:27:24Z DEBUG rustyline::tty::unix] initial cursor location: 1
[2019-08-05T08:27:35Z DEBUG rustyline::tty::unix] key: BracketedPasteStart
[2019-08-05T08:27:35Z DEBUG rustyline::keymap] Emacs command: Insert(1, "4100")
[2019-08-05T08:27:35Z DEBUG rustyline::undo] Changeset::insert_str(0, "4100")
[2019-08-05T08:27:36Z DEBUG rustyline::tty::unix] key: Enter
[2019-08-05T08:27:36Z DEBUG rustyline::keymap] Emacs command: AcceptLine

Write more than 4096 characters：

[2019-08-05T08:27:36Z DEBUG rustyline::tty::unix] initial cursor location: 1
[2019-08-05T08:27:41Z DEBUG rustyline::tty::unix] key: BracketedPasteStart
[2019-08-05T08:27:41Z DEBUG rustyline::keymap] Emacs command: Insert(1, "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")

The comparison shows that after the data is received, it is not written to stdout.

[driftluo]

oh, I know what happen, this MAX_LINE should not be hard code, should be configurable

rustyline/src/line_buffer.rs

Line 13 in 7e30f8d

pub(crate) static MAX_LINE: usize = 4096;

rustyline/src/edit.rs

Lines 44 to 59 in 7e30f8d

	pub fn new(
	out: &'out mut <Terminal as Term>::Writer,
	prompt: &'prompt str,
	helper: Option<&'out H>,
	ctx: Context<'out>,
	) -> State<'out, 'prompt, H> {
	let capacity = MAX_LINE;
	let prompt_size = out.calculate_position(prompt, Position::default());
	State {
	out,
	prompt,
	prompt_size,
	line: LineBuffer::with_capacity(capacity),
	cursor: prompt_size,
	old_rows: 0,
	saved_line_for_history: LineBuffer::with_capacity(capacity),

You can pass a buffer capacity here via edit config instead of hard code：

rustyline/src/lib.rs

Line 382 in 7e30f8d

let mut s = State::new(&mut stdout, prompt, helper, ctx);

Is this right？

[gwenn]

I suggest we remove the limit.
liner, linefeed, replxx, python-prompt-toolkit have no limit.
But editing will be slow.

[driftluo]

A long time ago, in linefeed, I did ask a question about performance.

I think for now, the default pre-allocation of 4096 capacity, and allowing growth may be a good balance of results.

I try to make a pr now :P