Add --all option to bounds, to display all non-empty slots

ledger-tool/src/main.rs

@@ -436,7 +436,14 @@ fn main() {
         )
         .subcommand(
             SubCommand::with_name("bounds")
-            .about("Print lowest and highest non-empty slots. Note: This ignores gaps in slots")
+            .about("Print lowest and highest non-empty slots. Note that there may be empty slots within the bounds")
+            .arg(
+                Arg::with_name("all")
+                    .long("all")
+                    .takes_value(false)
+                    .required(false)
+                    .help("Additionally print all the non-empty slots within the bounds"),
+            )
         )
         .subcommand(
             SubCommand::with_name("json")
@@ -719,8 +726,11 @@ fn main() {
                     }
                 });
         }
-        ("bounds", _) => match blocktree.slot_meta_iterator(0) {
+        ("bounds", Some(args_matches)) => {
+            match blocktree.slot_meta_iterator(0) {
                 Ok(metas) => {
+                    let all = args_matches.is_present("all");
+
                     println!("Collecting Ledger information...");
                     let slots: Vec<_> = metas.map(|(slot, _)| slot).collect();
                     if slots.is_empty() {
@@ -729,10 +739,10 @@ fn main() {
                         let first = slots.first().unwrap();
                         let last = slots.last().unwrap_or_else(|| first);
                         if first != last {
-                        println!(
+                            println!("Ledger contains data from slots {:?} to {:?}", first, last);
-                            "Ledger contains some data for slots {:?} to {:?}",
+                            if all {
-                            first, last
+                                println!("Non-empty slots: {:?}", slots);
-                        );
+                            }
                         } else {
                             println!("Ledger only contains some data for slot {:?}", first);
                         }
@@ -742,6 +752,7 @@ fn main() {
                     eprintln!("Unable to read the Ledger: {:?}", err);
                     exit(1);
                 }
+            }
         },
         ("", _) => {
             eprintln!("{}", matches.usage());