1 files changed, 53 insertions, 0 deletions
diff --git a/alacritty/src/config/scrolling.rs b/alacritty/src/config/scrolling.rs
new file mode 100644
index 00000000..3b2b21f3
--- /dev/null
+++ b/alacritty/src/config/scrolling.rs
@@ -0,0 +1,53 @@
+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
+    }
+}
+
+#[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))
+        }
+    }
+}