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Remove flicker on external print (#488)
* Remove flicker on external print Previously each external print was causing a visible flicker on at least two terminal emulators I've tested (alacritty, xfce4-terminal). * Make `Painter.print_external_message()` crate local * Put external_printer Painter members behind flag * Add `external_printer` feature to CI Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>
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4
.github/workflows/ci.yml
vendored
4
.github/workflows/ci.yml
vendored
@ -15,10 +15,12 @@ jobs:
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rust:
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- stable
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# Define the feature sets that will be built here (for caching you define a separate name)
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style: [bashisms, default, sqlite, basqlite]
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style: [bashisms, default, sqlite, basqlite, external_printer]
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include:
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- style: bashisms
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flags: "--features bashisms"
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- style: external_printer
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flags: "--features external_printer"
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- style: default
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flags: ""
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- style: sqlite
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@ -3,16 +3,18 @@ use {
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crate::{
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menu::{Menu, ReedlineMenu},
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painting::PromptLines,
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LineBuffer, Prompt,
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Prompt,
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},
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crossterm::{
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cursor::{self, MoveTo, MoveUp, RestorePosition, SavePosition},
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cursor::{self, MoveTo, RestorePosition, SavePosition},
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style::{Attribute, Print, ResetColor, SetAttribute, SetForegroundColor},
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terminal::{self, Clear, ClearType, ScrollUp},
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QueueableCommand, Result,
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},
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std::io::Write,
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};
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#[cfg(feature = "external_printer")]
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use {crate::LineBuffer, crossterm::cursor::MoveUp};
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// Returns a string that skips N number of lines with the next offset of lines
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// An offset of 0 would return only one line after skipping the required lines
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@ -454,7 +456,11 @@ impl Painter {
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}
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/// Prints an external message
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pub fn print_external_message(
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///
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/// This function doesn't flush the buffer. So buffer should be flushed
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/// afterwards perhaps by repainting the prompt via `repaint_buffer()`.
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#[cfg(feature = "external_printer")]
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pub(crate) fn print_external_message(
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&mut self,
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messages: Vec<String>,
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line_buffer: &LineBuffer,
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@ -486,7 +492,11 @@ impl Painter {
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let erase_line = format!("\r{}\r", " ".repeat(self.screen_width().into()));
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for line in messages {
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self.stdout.queue(Print(&erase_line))?;
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self.paint_line(&line)?;
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// Note: we don't use `print_line` here because we don't want to
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// flush right now. The subsequent repaint of the prompt will cause
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// immediate flush anyways. And if we flush here, every external
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// print causes visible flicker.
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self.stdout.queue(Print(line))?.queue(Print("\r\n"))?;
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let new_start = self.prompt_start_row.saturating_add(1);
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let height = self.screen_height();
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if new_start >= height {
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