Fix 907 and improve substring

src/commands/get.rs

@@ -10,7 +10,6 @@ pub struct Get;
 #[derive(Deserialize)]
 pub struct GetArgs {
     member: ColumnPath,
-    rest: Vec<ColumnPath>,
 }
 
 impl WholeStreamCommand for Get {
@@ -118,13 +117,10 @@ pub fn get_column_path(
 }
 
 pub fn get(
-    GetArgs {
-        member,
-        rest: fields,
-    }: GetArgs,
+    GetArgs { member }: GetArgs,
     RunnableContext { input, .. }: RunnableContext,
 ) -> Result<OutputStream, ShellError> {
-    trace!("get {:?} {:?}", member, fields);
+    trace!("get {:?}", member);
 
     let stream = input
         .values
@@ -133,12 +129,7 @@ pub fn get(
 
             let member = vec![member.clone()];
 
-            let column_paths = vec![&member, &fields]
-                .into_iter()
-                .flatten()
-                .collect::<Vec<&ColumnPath>>();
-
-            for path in column_paths {
+            for path in member {
                 let res = get_column_path(&path, &item);
 
                 match res {

src/plugins/str.rs

@@ -41,9 +41,13 @@ impl Str {
                 if start > input.len() - 1 {
                     Value::string("")
                 } else {
-                    // Index operator isn't perfect:
-                    // https://users.rust-lang.org/t/how-to-get-a-substring-of-a-string/1351
-                    Value::string(&input[start..end])
+                    Value::string(
+                        &input
+                            .chars()
+                            .skip(start)
+                            .take(end - start)
+                            .collect::<String>(),
+                    )
                 }
             }
             Some(Action::ToInteger) => match input.trim() {