factor out find previous space logic

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
-				#reverse for c, c_index in current_line()[:cursor.char - 1] {
-					if is_whitespace(c) {
-						seen_space = true
-						preferred_position = c_index + 1
-						break
-					}
-				}
-				if !seen_space {
-					preferred_position = 0
-				}
+				found := false
+				preferred_position, found = find_previous_space(cursor.char, current_line()[:])
 			}
 			cursor.char = max(preferred_position, 0)
 		}
@@ -268,3 +262,15 @@ 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
+}