moved commands

crates/nu-command/src/strings/build_string.rs

@@ -0,0 +1,38 @@
+use nu_engine::eval_expression;
+use nu_protocol::ast::Call;
+use nu_protocol::engine::{Command, EvaluationContext};
+use nu_protocol::{ShellError, Signature, SyntaxShape, Value};
+
+pub struct BuildString;
+
+impl Command for BuildString {
+    fn name(&self) -> &str {
+        "build-string"
+    }
+
+    fn usage(&self) -> &str {
+        "Create a string from the arguments."
+    }
+
+    fn signature(&self) -> nu_protocol::Signature {
+        Signature::build("build-string").rest("rest", SyntaxShape::String, "list of string")
+    }
+
+    fn run(
+        &self,
+        context: &EvaluationContext,
+        call: &Call,
+        _input: Value,
+    ) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
+        let output = call
+            .positional
+            .iter()
+            .map(|expr| eval_expression(context, expr).map(|val| val.into_string()))
+            .collect::<Result<Vec<String>, ShellError>>()?;
+
+        Ok(Value::String {
+            val: output.join(""),
+            span: call.head,
+        })
+    }
+}

crates/nu-command/src/strings/mod.rs

@@ -0,0 +1,3 @@
+mod build_string;
+
+pub use build_string::BuildString;