feat: update: #4518, Add example for register,source,save,shuffle and from tsv (#4577)

crates/nu-command/src/core_commands/register.rs

@@ -1,6 +1,6 @@
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, PipelineData, Signature, SyntaxShape};
+use nu_protocol::{Category, Example, PipelineData, Signature, SyntaxShape};
 
 #[derive(Clone)]
 pub struct Register;
@@ -50,4 +50,19 @@ impl Command for Register {
     ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
         Ok(PipelineData::new(call.head))
     }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "Register `nu_plugin_extra_query` plugin from ~/.cargo/bin/ dir",
+                example: r#"register -e capnp ~/.cargo/bin/nu_plugin_extra_query"#,
+                result: None,
+            },
+            Example {
+                description: "Register `nu_plugin_extra_query` plugin from `nu -c`(plugin will be available in that nu session only)",
+                example: r#"let plugin = ((which nu).path.0 | path dirname | path join 'nu_plugin_extra_query'); nu -c $'register -e capnp ($plugin); version'"#,
+                result: None,
+            },
+        ]
+    }
 }

crates/nu-command/src/core_commands/source.rs

@@ -1,7 +1,7 @@
 use nu_engine::{eval_block, CallExt};
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, PipelineData, ShellError, Signature, SyntaxShape};
+use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, SyntaxShape};
 
 /// Source a file for environment variables.
 #[derive(Clone)]
@@ -40,4 +40,24 @@ impl Command for Source {
         let block = engine_state.get_block(block_id as usize).clone();
         eval_block(engine_state, stack, &block, input)
     }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "Runs foo.nu in the current context",
+                example: r#"source foo.nu"#,
+                result: None,
+            },
+            Example {
+                description: "Runs foo.nu in current context and call the command defined, suppose foo.nu has content: `def say-hi [] { echo 'Hi!' }`",
+                example: r#"source ./foo.nu; say-hi"#,
+                result: None,
+            },
+            Example {
+                description: "Runs foo.nu in current context and call the `main` command automatically, suppose foo.nu has content: `def main [] { echo 'Hi!' }`",
+                example: r#"source ./foo.nu"#,
+                result: None,
+            },
+        ]
+    }
 }