feat: initial commit.

src/main.rs

@@ -0,0 +1,51 @@
+use nu_plugin::{MsgPackSerializer, Plugin, PluginCommand, SimplePluginCommand, serve_plugin};
+use nu_protocol::{LabeledError, Signature, Type, Value};
+
+struct MyPlugin;
+
+impl Plugin for MyPlugin {
+    fn version(&self) -> String {
+        env!("CARGO_PKG_VERSION").into()
+    }
+
+    fn commands(&self) -> Vec<Box<dyn nu_plugin::PluginCommand<Plugin = Self>>> {
+        vec![Box::new(MyCommand)]
+    }
+}
+
+struct MyCommand;
+
+impl SimplePluginCommand for MyCommand {
+    type Plugin = MyPlugin;
+
+    fn name(&self) -> &str {
+        "mynu"
+    }
+
+    fn signature(&self) -> nu_protocol::Signature {
+        Signature::build(PluginCommand::name(self)).input_output_type(Type::String, Type::String)
+    }
+
+    fn description(&self) -> &str {
+        "A learning rust plugin"
+    }
+
+    fn run(
+        &self,
+        _plugin: &Self::Plugin,
+        _engine: &nu_plugin::EngineInterface,
+        _call: &nu_plugin::EvaluatedCall,
+        input: &nu_protocol::Value,
+    ) -> Result<nu_protocol::Value, nu_protocol::LabeledError> {
+        match input {
+            Value::String { val, .. } => {
+                Ok(Value::string(format!("Hello, {}!", val), input.span()))
+            }
+            _ => Err(LabeledError::new("Expected String input").into()),
+        }
+    }
+}
+
+fn main() {
+    serve_plugin(&MyPlugin {}, MsgPackSerializer)
+}