fix backspace bug

.gitignore

@@ -3,3 +3,5 @@ bin
 .DS_Store
 src/src
 scratch
+src.bin*
+*.sublime-workspace

odit.sublime-project

@@ -0,0 +1,26 @@
+{
+	"debugger_configurations":
+	[
+		{
+			"type": "lldb",
+			"request": "launch",
+			"name": "Launch",
+			"program": "${project_path}/src.bin",
+			"args": [],
+			"cwd": "${project_path}"
+		},
+	],
+	"build_systems": [
+		{
+			"cmd": ["odin", "build", "src", "-debug"],
+			"name": "odit",
+			"selector": "source.odin",
+			"working_dir": "${project_path}"
+		}
+	],
+	"folders": [
+		{
+			"path": "."
+		}
+	]
+}

src/main.odin

@@ -29,7 +29,7 @@ read_file :: proc(path: string) -> (string, bool) {
 
 Viewport :: struct {
 	start: int,
-	end: int,
+	end:   int,
 }
 
 Cursor :: struct {
@@ -44,7 +44,10 @@ text_height: f32
 cursor: Cursor
 lines: [dynamic][dynamic]u8
 viewport_size := window_height / int(font_size)
-viewport := Viewport{start = 0, end = viewport_size}
+viewport := Viewport {
+	start = 0,
+	end   = viewport_size,
+}
 
 main :: proc() {
 	r.InitWindow(i32(window_width), i32(window_height), "odit")
@@ -104,17 +107,8 @@ main :: proc() {
 				cursor.char = len(current_line())
 			}
 			if r.IsKeyDown(r.KeyboardKey.LEFT_ALT) && 0 < cursor.char {
-				seen_space := false
+				found := false
-				#reverse for c, c_index in current_line()[:cursor.char - 1] {
+				preferred_position, found = find_previous_space(cursor.char, current_line()[:])
-					if is_whitespace(c) {
-						seen_space = true
-						preferred_position = c_index + 1
-						break
-					}
-				}
-				if !seen_space {
-					preferred_position = 0
-				}
 			}
 			cursor.char = max(preferred_position, 0)
 		}
@@ -180,9 +174,10 @@ main :: proc() {
 			fmt.println("Wrote file!")
 		}
 
-		if repeatable_key_pressed(r.KeyboardKey.BACKSPACE) {
+		skip_backspace: if repeatable_key_pressed(r.KeyboardKey.BACKSPACE) {
-			if cursor.line == 0 && cursor.char == 0 do continue
+			if cursor.line == 0 && cursor.char == 0 do break skip_backspace
 			if cursor.char == 0 {
+				// join lines
 				old_len := len(lines[cursor.line - 1])
 				append(&lines[cursor.line - 1], string(current_line()[:]))
 				line_to_remove := current_line()^
@@ -191,8 +186,21 @@ main :: proc() {
 				cursor.line -= 1
 				cursor.char = old_len
 			} else {
-				ordered_remove(&lines[cursor.line], cursor.char - 1)
+				if r.IsKeyDown(r.KeyboardKey.LEFT_ALT) {
-				cursor.char -= 1
+					// delete by word
+					delete_to, found := find_previous_space(cursor.char, current_line()[:])
+					if found {
+						remove_range(current_line(), delete_to, cursor.char)
+						cursor.char = delete_to
+					} else {
+						remove_range(current_line(), 0, cursor.char)
+						cursor.char = 0
+					}
+				} else {
+					// delete single char
+					ordered_remove(&lines[cursor.line], cursor.char - 1)
+					cursor.char -= 1
+				}
 			}
 		}
 
@@ -268,3 +276,15 @@ all_whitespace :: proc(cs: []u8) -> bool {
 repeatable_key_pressed :: proc(k: r.KeyboardKey) -> bool {
 	return r.IsKeyPressed(k) || r.IsKeyPressedRepeat(k)
 }
+
+find_previous_space :: proc(current_position: int, line: []u8) -> (result: int, found: bool) {
+	#reverse for c, c_index in line[:current_position - 1] {
+		if is_whitespace(c) {
+			found = true
+			result = c_index + 1
+			break
+		}
+	}
+
+	return result, found
+}