add line address, change u32 for usize in Address

remove one useless print too

src/enums.rs

@@ -1,17 +1,18 @@
+use std::str::FromStr;
+
 #[derive(Debug)]
 pub enum Address {
     Actual,
     Last,
-    Line(u32),
-    FromStartTo(u32),
-    FromToEnd(u32),
-    FromTo(u32, u32),
+    Line(usize),
+    FromStartTo(usize),
+    FromToEnd(usize),
+    FromTo(usize, usize),
     Null,
 }
 
 impl Address {
     pub fn is_null(&self) -> bool {
-        println!("{:?}", self);
         match self {
             Self::Null => true,
             _ => false,
@@ -26,6 +27,8 @@ pub fn parse_address(addr: &str) -> Address {
 
     if addr.is_empty() {
         Address::Actual
+    } else if let Ok(l) = usize::from_str(addr) {
+        Address::Line(l)
     } else {
         match addr {
             "." => Address::Actual,
@@ -37,8 +40,6 @@ pub fn parse_address(addr: &str) -> Address {
 
 #[derive(Debug)]
 pub enum Command {
-    ChangeAddr(Address),
-
     Append(Address),
     Insert(Address),
     Change(Address),