From baf6348e663b8d7ef1a047b706f3c409f61961db Mon Sep 17 00:00:00 2001
From: Justin Ma <hustcer@outlook.com>
Date: Sat, 12 Feb 2022 23:06:52 +0800
Subject: [PATCH] feat: add unalias to deprecated command (#4440)

---
 crates/nu-command/src/default_context.rs    |  1 +
 crates/nu-command/src/deprecated/mod.rs     |  2 ++
 crates/nu-command/src/deprecated/unalias.rs | 36 +++++++++++++++++++++
 3 files changed, 39 insertions(+)
 create mode 100644 crates/nu-command/src/deprecated/unalias.rs

diff --git a/crates/nu-command/src/default_context.rs b/crates/nu-command/src/default_context.rs
index 3341e674a6..ca543083df 100644
--- a/crates/nu-command/src/default_context.rs
+++ b/crates/nu-command/src/default_context.rs
@@ -357,6 +357,7 @@ pub fn create_default_context(cwd: impl AsRef<Path>) -> EngineState {
             StrDecimalDeprecated,
             StrIntDeprecated,
             NthDeprecated,
+            UnaliasDeprecated,
         };
 
         #[cfg(feature = "dataframe")]
diff --git a/crates/nu-command/src/deprecated/mod.rs b/crates/nu-command/src/deprecated/mod.rs
index 1533ced003..e70076780e 100644
--- a/crates/nu-command/src/deprecated/mod.rs
+++ b/crates/nu-command/src/deprecated/mod.rs
@@ -3,12 +3,14 @@ mod nth;
 mod pivot;
 mod str_decimal;
 mod str_int;
+mod unalias;
 
 pub use insert::InsertDeprecated;
 pub use nth::NthDeprecated;
 pub use pivot::PivotDeprecated;
 pub use str_decimal::StrDecimalDeprecated;
 pub use str_int::StrIntDeprecated;
+pub use unalias::UnaliasDeprecated;
 
 #[cfg(feature = "dataframe")]
 mod dataframe;
diff --git a/crates/nu-command/src/deprecated/unalias.rs b/crates/nu-command/src/deprecated/unalias.rs
new file mode 100644
index 0000000000..6cffc40ceb
--- /dev/null
+++ b/crates/nu-command/src/deprecated/unalias.rs
@@ -0,0 +1,36 @@
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EngineState, Stack},
+    Category, PipelineData, Signature,
+};
+
+#[derive(Clone)]
+pub struct UnaliasDeprecated;
+
+impl Command for UnaliasDeprecated {
+    fn name(&self) -> &str {
+        "unalias"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build(self.name()).category(Category::Deprecated)
+    }
+
+    fn usage(&self) -> &str {
+        "Deprecated command"
+    }
+
+    fn run(
+        &self,
+        _engine_state: &EngineState,
+        _stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+        Err(nu_protocol::ShellError::DeprecatedCommand(
+            self.name().to_string(),
+            "hide".to_string(),
+            call.head,
+        ))
+    }
+}