From 725e6784abaa2da2e55d557133511d160af787ff Mon Sep 17 00:00:00 2001
From: alice pellerin <thealicepellerin@gmail.com>
Date: Wed, 18 Mar 2026 15:39:37 -0500
Subject: [PATCH] preview bytes under cursor when replacing

---
 src/app/widget.rs  | 19 ++++++++++++++++++-
 src/edit_action.rs |  1 +
 src/main.rs        |  2 ++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/app/widget.rs b/src/app/widget.rs
index b8e9cb3..1c3a8e5 100644
--- a/src/app/widget.rs
+++ b/src/app/widget.rs
@@ -78,7 +78,7 @@ mod hex {
 	use itertools::{Itertools, repeat_n};
 	use ratatui::{style::{Color, Style, Stylize}, text::Span};
 	
-	use crate::{BYTES_PER_CHUNK, BYTES_PER_LINE, CHUNKS_PER_LINE, app::{App, Mode}, cardinality::HasCardinality, cursor::InCursor, custom_greys::CustomGreys, empty_span::empty_span};
+	use crate::{BYTES_PER_CHUNK, BYTES_PER_LINE, CHUNKS_PER_LINE, app::{App, Mode, PartialAction}, cardinality::HasCardinality, cursor::InCursor, custom_greys::CustomGreys, empty_span::empty_span};
 	
 	impl App {
 		pub fn render_chunks(
@@ -189,6 +189,23 @@ mod hex {
 			&self,
 			address: usize,
 			byte: u8
+		) -> Span<'static> {
+			if self.partial_action == Some(PartialAction::Replace) &&
+			   self.cursor.contains(address).is_some()
+			{
+				let replaced_byte = self.partial_replace.unwrap_or(0) << 4;
+				
+				self.render_byte_without_replace_preview(address, replaced_byte)
+					.fg(Color::Black)
+			} else {
+				self.render_byte_without_replace_preview(address, byte)
+			}
+		}
+		
+		fn render_byte_without_replace_preview(
+			&self,
+			address: usize,
+			byte: u8
 		) -> Span<'static> {
 			const SPAN_FOR_BYTE: [Span; u8::CARDINALITY] = create_byte_lookup_table();
 			
diff --git a/src/edit_action.rs b/src/edit_action.rs
index cdac870..e741eff 100644
--- a/src/edit_action.rs
+++ b/src/edit_action.rs
@@ -1,6 +1,7 @@
 use std::cmp::min;
 use crate::{app::App, cursor::Cursor};
 
+#[derive(Debug)]
 pub enum EditAction {
 	Delete {
 		cursor: Cursor,
diff --git a/src/main.rs b/src/main.rs
index f1d61c8..77da572 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -69,6 +69,8 @@ fn main() {
 	
 	ratatui::restore();
 	
+	// dbg!(app.edit_history);
+	
 	for log in app.logs {
 		println!("{log}");
 	}