replacing

src/action.rs

@@ -9,9 +9,9 @@ pub enum Action {
 	NormalMode,
 	SelectMode,
 	
-	GPartial,
-	ZPartial,
-	RPartial,
+	Goto,
+	Zview,
+	Replace,
 	
 	MoveByteUp,
 	MoveByteDown,
@@ -61,9 +61,9 @@ impl App {
 			Action::NormalMode => self.normal_mode(),
 			Action::SelectMode => self.select_mode(),
 			
-			Action::GPartial => self.g_partial(),
-			Action::ZPartial => self.z_partial(),
-			Action::RPartial => self.r_partial(),
+			Action::Goto => self.goto(),
+			Action::Zview => self.zview(),
+			Action::Replace => self.replace(),
 			
 			Action::MoveByteUp => self.move_byte_up(),
 			Action::MoveByteDown => self.move_byte_down(),
@@ -118,15 +118,15 @@ impl App {
 		self.mode = Mode::Select;
 	}
 	
-	const fn g_partial(&mut self) {
+	const fn goto(&mut self) {
 		self.partial_action = Some(PartialAction::Goto);
 	}
 	
-	const fn z_partial(&mut self) {
+	const fn zview(&mut self) {
 		self.partial_action = Some(PartialAction::Zview);
 	}
 	
-	const fn r_partial(&mut self) {
+	const fn replace(&mut self) {
 		self.partial_action = Some(PartialAction::Replace);
 	}
 	
@@ -343,7 +343,7 @@ impl App {
 		self.execute_and_add(
 			EditAction::Delete {
 				cursor: self.cursor,
-				data: self.contents[self.cursor.range()].into()
+				old_data: self.contents[self.cursor.range()].into()
 			}
 		);
 		

src/app/mod.rs

@@ -20,6 +20,7 @@ pub struct App {
 	
 	pub mode: Mode,
 	pub partial_action: Option<PartialAction>,
+	pub partial_replace: Option<u8>,
 	
 	pub edit_history: Vec<EditAction>,
 	// some index to keep track of where we are? edit_prophecy?
@@ -27,18 +28,18 @@ pub struct App {
 	pub logs: Vec<String>,
 }
 
-#[derive(Hash, PartialEq, Eq)]
+#[derive(Clone, Copy, Hash, PartialEq, Eq)]
 pub enum Mode {
 	Normal, Select, Insert
 }
 
-#[derive(Hash, PartialEq, Eq)]
+#[derive(Clone, Copy, Hash, PartialEq, Eq)]
 pub enum PartialAction {
 	Goto, Zview, Replace
 }
 
 impl Mode {
-	pub const fn label(&self) -> &'static str {
+	pub const fn label(self) -> &'static str {
 		match self {
 			Self::Normal => " NORMAL ",
 			Self::Select => " SELECT ",
@@ -46,7 +47,7 @@ impl Mode {
 		}
 	}
 	
-	pub const fn color(&self) -> Color {
+	pub const fn color(self) -> Color {
 		match self {
 			Self::Normal => Color::Blue,
 			Self::Select => Color::Yellow,
@@ -56,7 +57,7 @@ impl Mode {
 }
 
 impl PartialAction {
-	pub const fn label(&self) -> &'static str {
+	pub const fn label(self) -> &'static str {
 		match self {
 			Self::Goto => "g",
 			Self::Zview => "z",
@@ -98,6 +99,7 @@ impl App {
 			
 			mode: Mode::Normal,
 			partial_action: None,
+			partial_replace: None,
 			
 			edit_history: Vec::new(),
 			
@@ -122,17 +124,69 @@ impl App {
 	}
 	
 	fn handle_key(&mut self, event: KeyEvent) {
-		let should_reset_partial = self.partial_action.is_some();
+		if self.partial_action == Some(PartialAction::Replace) {
+			if let Some(hex_character) = event.code.as_char() &&
+			   let Some(nybble) = nybble_from_hex(hex_character)
+			{
+				if let Some(partial_replace) = self.partial_replace.take() {
+					self.execute_and_add(
+						EditAction::Replace {
+							cursor: self.cursor,
+							old_data: self.contents[self.cursor.range()].into(),
+							new_byte: partial_replace << 4 | nybble
+						}
+					);
+					self.partial_action = None;
+				} else {
+					self.partial_replace = Some(nybble);
+				}
+			} else {
+				self.partial_action = None;
+				self.partial_replace = None;
+			}
+		} else {
+			let should_reset_partial = self.partial_action.is_some();
 			
-		if let Some(mode_config) = self.config.0.get(&self.mode) &&
-		   let Some(keybinds) = mode_config.0.get(&self.partial_action) &&
-		   let Some(action) = keybinds.0.get(&event.into())
-		{
-			self.execute(*action);
-		}
+			if let Some(mode_config) = self.config.0.get(&self.mode) &&
+			   let Some(keybinds) = mode_config.0.get(&self.partial_action) &&
+			   let Some(action) = keybinds.0.get(&event.into())
+			{
+				self.execute(*action);
+			}
 			
-		if should_reset_partial {
-			self.partial_action = None;
+			if should_reset_partial {
+				self.partial_action = None;
+			}
+		}
+	}
+}
+
+fn nybble_from_hex(hex: char) -> Option<u8> {
+	if !hex.is_ascii() { return None }
+	
+	match hex {
+		'0'..='9' => Some(u8::try_from(hex).unwrap() - u8::try_from('0').unwrap()),
+		'a'..='f' => Some(u8::try_from(hex).unwrap() - u8::try_from('a').unwrap() + 10),
+		'A'..='F' => Some(u8::try_from(hex).unwrap() - u8::try_from('A').unwrap() + 10),
+		_ => None
+	}
+}
+
+mod tests {
+	#[allow(unused_imports)]
+	use crate::app::nybble_from_hex;
+	
+	#[test]
+	fn nybble_from_hex_case_doesnt_matter() {
+		for character in 'a'..='f' {
+			assert_eq!(nybble_from_hex(character), nybble_from_hex(character.to_ascii_uppercase()));
+		}
+	}
+	
+	#[test]
+	fn nybble_from_hex_digits_are_correct() {
+		for (index, character) in ('0'..='9').enumerate() {
+			assert_eq!(nybble_from_hex(character), Some(index as u8));
 		}
 	}
 }

src/app/widget.rs

@@ -394,7 +394,7 @@ mod status_line {
 }
 
 mod extra_statuses {
-	use crate::app::{App, PartialAction};
+	use crate::app::App;
 	use ratatui::text::Line;
 	
 	impl App {
@@ -404,7 +404,7 @@ mod extra_statuses {
 			
 			let partial_action = self.partial_action
 				.as_ref()
-				.map_or("", PartialAction::label);
+				.map_or("", |partial_action| partial_action.label());
 			
 			format!("{partial_action} {percentage:.0}% ").into()
 		}

src/config.rs

@@ -103,9 +103,9 @@ impl Default for Config {
 					
 					("v".try_into().unwrap(), Action::SelectMode),
 					
-					("g".try_into().unwrap(), Action::GPartial),
-					("z".try_into().unwrap(), Action::ZPartial),
-					("r".try_into().unwrap(), Action::RPartial),
+					("g".try_into().unwrap(), Action::Goto),
+					("z".try_into().unwrap(), Action::Zview),
+					("r".try_into().unwrap(), Action::Replace),
 					
 					("i".try_into().unwrap(), Action::MoveByteUp),
 					("k".try_into().unwrap(), Action::MoveByteDown),
@@ -147,9 +147,9 @@ impl Default for Config {
 					
 					("v".try_into().unwrap(), Action::NormalMode),
 					
-					("g".try_into().unwrap(), Action::GPartial),
-					("z".try_into().unwrap(), Action::ZPartial),
-					("r".try_into().unwrap(), Action::RPartial),
+					("g".try_into().unwrap(), Action::Goto),
+					("z".try_into().unwrap(), Action::Zview),
+					("r".try_into().unwrap(), Action::Replace),
 					
 					("i".try_into().unwrap(), Action::ExtendByteUp),
 					("k".try_into().unwrap(), Action::ExtendByteDown),

src/cursor.rs

@@ -1,6 +1,6 @@
 use std::ops::RangeInclusive;
 
-#[derive(Clone, Copy, Default, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
 pub struct Cursor {
 	pub head: usize,
 	pub tail: usize

src/edit_action.rs

@@ -4,7 +4,12 @@ use crate::{app::App, cursor::Cursor};
 pub enum EditAction {
 	Delete {
 		cursor: Cursor,
-		data: Vec<u8>
+		old_data: Vec<u8>
+	},
+	Replace {
+		cursor: Cursor,
+		old_data: Vec<u8>,
+		new_byte: u8
 	}
 }
 
@@ -17,6 +22,9 @@ impl App {
 	fn execute_edit(&mut self, edit_action: &EditAction) {
 		match edit_action {
 			EditAction::Delete { cursor, .. } => self.delete_at(*cursor),
+			EditAction::Replace {
+				cursor, old_data: _, new_byte
+			} => self.replace_at_with(*cursor, *new_byte),
 		}
 	}
 	
@@ -26,4 +34,10 @@ impl App {
 		self.cursor.head = min(cursor.head, cursor.tail);
 		self.cursor.collapse();
 	}
+	
+	fn replace_at_with(&mut self, cursor: Cursor, new_byte: u8) {
+		self.contents[self.cursor.range()].fill(new_byte);
+		
+		self.cursor = cursor;
+	}
 }

src/main.rs

@@ -18,23 +18,23 @@ const CHUNKS_PER_LINE: usize = BYTES_PER_LINE / BYTES_PER_CHUNK;
 
 // TODO:
 // - undo/redo
-// - modes
-//   - select
-//   - insert
-//   - zz/zt/zb
 // - modifications
+//   - replace
+//     - partial action(s)
 //   - insert/append
 //     - mode
-//   - replace
-//     - partial action
+//     - how this works with edit history is strange :/
+//     - add to edit history when *leaving* insert mode
 //   - replace-and-keep-going
 //     - mode
-//   - delete
 //   - change
+// - saving
+// - search
 // - edit character panel
 //   - modifier on existing keys like teehee? or jump to panel?
 //     - if jump to panel, space?
-// - search
+// - zz/zt/zb
+// - visual gg/G
 // - jumplist
 // - f/t
 //   - ascii?
@@ -53,6 +53,8 @@ const CHUNKS_PER_LINE: usize = BYTES_PER_LINE / BYTES_PER_CHUNK;
 // - utf8?
 // - diffing
 
+// when AsciiChar is stabilized, use it instead of char everywhere
+
 fn main() {
 	let mut app = App::init();
 	let mut terminal = ratatui::init();