add total metrics to ll and lu

src/main.rs

@@ -101,14 +101,19 @@ fn do_command(line: &str, state: &mut State) -> Result<()> {
 		["ll"] => {
 			let mut names = state.db.tree_names();
 			names.sort();
+			let mut total = 0;
 			for name in names {
 				let nent = state.db.open_tree(&name)?.len();
+				total += nent;
 				println!("{:8} {}", nent, try_string(&name));
 			}
+			println!("{:8} TOTAL", total);
 		}
 		["lu"] => {
 			let mut names = state.db.tree_names();
 			names.sort();
+			let mut total_nent = 0;
+			let mut total_size = 0;
 			for name in names {
 				let tree = state.db.open_tree(&name)?;
 				let nent = tree.len();
@@ -117,6 +122,8 @@ fn do_command(line: &str, state: &mut State) -> Result<()> {
 					let (k, v) = ent?;
 					size += k.len() + v.len();
 				}
+				total_nent += nent;
+				total_size += size;
 				println!(
 					"{:8} {:>12} {}",
 					nent,
@@ -124,6 +131,9 @@ fn do_command(line: &str, state: &mut State) -> Result<()> {
 					try_string(&name)
 				);
 			}
+			println!("{:8} {:>12} TOTAL",
+					 total_nent,
+					 total_size.file_size(file_size_opts::CONVENTIONAL).unwrap());
 		}
 		["cd", treename] => {
 			if state