Report when a directory is empty

Cargo.toml

@@ -21,3 +21,4 @@ spinoff = { version = "0.8.0", features = ["dots"] }
 [dev-dependencies]
 assert_cmd = "2.0.16"
 predicates = "3.1.2"
+tempfile = "3.12.0"

src/main.rs

@@ -20,9 +20,13 @@ fn main() -> anyhow::Result<()> {
     let results = find_top_n_largest_files(&args.path, args.number)?;
     sp.clear();
 
-    println!("*** Top {} largest files ***", results.len());
-    for (size, path) in results {
-        println!("{} {}", size, path.display());
+    if results.is_empty() {
+        println!("The directory is empty.");
+    } else {
+        println!("*** Top {} largest files ***", results.len());
+        for (size, path) in results {
+            println!("{} {}", size, path.display());
+        }
     }
 
     Ok(())

tests/cli.rs

@@ -1,6 +1,7 @@
 use std::io::BufRead;
 
 use assert_cmd::Command;
+use tempfile::TempDir;
 
 #[test]
 fn binary_with_version_flag_prints_version() {
@@ -68,6 +69,17 @@ fn binary_with_the_number_arg_prints_the_top_n_largest_files_under_the_current_w
         .stdout(predicates::str::contains("*** Top 10 largest files ***"));
 }
 
+#[test]
+fn binary_reports_that_the_directory_is_empty_if_it_contains_zero_files() {
+    let dir = TempDir::new().expect("failed to create temporary directory");
+    Command::cargo_bin("spacehog")
+        .unwrap()
+        .arg(dir.path())
+        .assert()
+        .success()
+        .stdout(predicates::str::contains("The directory is empty."));
+}
+
 #[test]
 fn binary_with_invalid_path_arg_prints_an_error_message_and_exits_with_failure_code() {
     #[cfg(windows)]