fixed top-level keys

src/main.rs

@@ -40,20 +40,26 @@ fn main() {
   } else { content = input.to_string(); }
 
   let mut tabkey: Vec<&str> = arguments[0].split(".").collect();
-  let mut indexvec: Vec<&str> = tabkey[1].split(&['[', ']'][..]).collect();
-
-  tabkey[1] = indexvec.remove(0);
+  let mut indexvec = Vec::new();
   let mut index: usize = 0;
-  if ! indexvec.is_empty() {
-    let istr = indexvec.remove(0);
-    match usize::from_str(istr) {
-      Ok(i) => index = i,
-      Err(_) => {
-        eprintln!("{}: {}: Cannot index by given value.", argv0, istr);
-        process::exit(65); // sysexits(3) EX_DATAERR
-      },
-    };
-  }
+
+  match tabkey.iter().skip(1).peekable().peek() {
+    Some(_) => {
+      indexvec = tabkey[1].split(&['[', ']'][..]).collect();
+      tabkey[1] = indexvec.remove(0);
+      if ! indexvec.is_empty() {
+        let istr = indexvec.remove(0);
+        match usize::from_str(istr) {
+          Ok(i) => index = i,
+          Err(_) => {
+            eprintln!("{}: {}: Cannot index by given value.", argv0, istr);
+            process::exit(65); // sysexits(3) EX_DATAERR
+          },
+        };
+      }
+    },
+    None => {},
+  };
 
   let mut root = content.parse::<Value>().unwrap();