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use serde::de::Error as SerdeError;
use serde::{Deserialize, Deserializer};
use alacritty_config_derive::{ConfigDeserialize, SerdeReplace};
/// Maximum scrollback amount configurable.
pub const MAX_SCROLLBACK_LINES: u32 = 100_000;
/// Struct for scrolling related settings.
#[derive(ConfigDeserialize, Copy, Clone, Debug, PartialEq, Eq)]
pub struct Scrolling {
pub multiplier: u8,
history: ScrollingHistory,
}
impl Default for Scrolling {
fn default() -> Self {
Self { multiplier: 3, history: Default::default() }
}
}
impl Scrolling {
pub fn history(self) -> u32 {
self.history.0
}
// Update the history size, used in ref tests.
pub fn set_history(&mut self, history: u32) {
self.history = ScrollingHistory(history);
}
}
#[derive(SerdeReplace, Copy, Clone, Debug, PartialEq, Eq)]
struct ScrollingHistory(u32);
impl Default for ScrollingHistory {
fn default() -> Self {
Self(10_000)
}
}
impl<'de> Deserialize<'de> for ScrollingHistory {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let lines = u32::deserialize(deserializer)?;
if lines > MAX_SCROLLBACK_LINES {
Err(SerdeError::custom(format!(
"exceeded maximum scrolling history ({}/{})",
lines, MAX_SCROLLBACK_LINES
)))
} else {
Ok(Self(lines))
}
}
}
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