[birka-cli] disallow directories from being indexed.

The program now exits with an error if `add` is given a directory as an
argument.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/birka-cli.rs b/src/birka-cli.rs
index 8396ef4..6f588fa 100644
--- a/src/birka-cli.rs
+++ b/src/birka-cli.rs
@@ -64,7 +64,12 @@ fn main() {
                 eprintln!("usage: {} add PATH [TAGS ...]", args[0]);
                 std::process::exit(1);
             }
+
             let path = Path::new(&args[2]).canonicalize().unwrap();
+            if path.is_dir() {
+                eprintln!("'{}' is a directory", args[2]);
+            }
+
             tb.add_file(&path, &args[3..].to_vec()).unwrap();
         }
         "add_tags" => {