From adabc839bffa6c0d6de83d8f98b429c394299f1e Mon Sep 17 00:00:00 2001
From: xiuxiu62 <jacremer@live.com>
Date: Thu, 7 Oct 2021 14:18:03 -0700
Subject: [PATCH] add touch command

---
 crates/nu-command/src/default_context.rs  |  1 +
 crates/nu-command/src/filesystem/mod.rs   |  2 +
 crates/nu-command/src/filesystem/touch.rs | 56 +++++++++++++++++++++++
 crates/nu-protocol/src/shell_error.rs     |  4 ++
 4 files changed, 63 insertions(+)
 create mode 100644 crates/nu-command/src/filesystem/touch.rs

diff --git a/crates/nu-command/src/default_context.rs b/crates/nu-command/src/default_context.rs
index fd2ea37555..06abdd8bbd 100644
--- a/crates/nu-command/src/default_context.rs
+++ b/crates/nu-command/src/default_context.rs
@@ -41,6 +41,7 @@ pub fn create_default_context() -> Rc<RefCell<EngineState>> {
         working_set.add_decl(Box::new(Select));
         working_set.add_decl(Box::new(Sys));
         working_set.add_decl(Box::new(Table));
+        working_set.add_decl(Box::new(Touch));
         working_set.add_decl(Box::new(Use));
         working_set.add_decl(Box::new(Where));
         working_set.add_decl(Box::new(Wrap));
diff --git a/crates/nu-command/src/filesystem/mod.rs b/crates/nu-command/src/filesystem/mod.rs
index 2d2212766a..926ffe2e54 100644
--- a/crates/nu-command/src/filesystem/mod.rs
+++ b/crates/nu-command/src/filesystem/mod.rs
@@ -2,9 +2,11 @@ mod cd;
 mod cp;
 mod ls;
 mod mv;
+mod touch;
 mod util;
 
 pub use cd::Cd;
 pub use cp::Cp;
 pub use ls::Ls;
 pub use mv::Mv;
+pub use touch::Touch;
diff --git a/crates/nu-command/src/filesystem/touch.rs b/crates/nu-command/src/filesystem/touch.rs
new file mode 100644
index 0000000000..c895538858
--- /dev/null
+++ b/crates/nu-command/src/filesystem/touch.rs
@@ -0,0 +1,56 @@
+use std::fs::OpenOptions;
+
+use nu_engine::CallExt;
+use nu_protocol::ast::Call;
+use nu_protocol::engine::{Command, EvaluationContext};
+use nu_protocol::{ShellError, Signature, SyntaxShape, Value};
+
+pub struct Touch;
+
+impl Command for Touch {
+    fn name(&self) -> &str {
+        "touch"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("touch")
+            .required(
+                "filename",
+                SyntaxShape::Filepath,
+                "the path of the file you want to create",
+            )
+            .rest("rest", SyntaxShape::Filepath, "additional files to create")
+    }
+
+    fn usage(&self) -> &str {
+        "Creates one or more files."
+    }
+
+    fn run(
+        &self,
+        context: &EvaluationContext,
+        call: &Call,
+        _input: Value,
+    ) -> Result<Value, ShellError> {
+        touch(context, call)
+    }
+}
+
+fn touch(context: &EvaluationContext, call: &Call) -> Result<Value, ShellError> {
+    let target: String = call.req(context, 0)?;
+    let rest: Vec<String> = call.rest(context, 1)?;
+
+    for (index, item) in vec![target].into_iter().chain(rest).enumerate() {
+        match OpenOptions::new().write(true).create(true).open(&item) {
+            Ok(_) => continue,
+            Err(err) => {
+                return Err(ShellError::CreateNotPossible(
+                    format!("Failed to create file: {}", err),
+                    call.positional[index].span,
+                ));
+            }
+        }
+    }
+
+    Ok(Value::Nothing { span: call.head })
+}
diff --git a/crates/nu-protocol/src/shell_error.rs b/crates/nu-protocol/src/shell_error.rs
index 6a7464508e..ab7da16eae 100644
--- a/crates/nu-protocol/src/shell_error.rs
+++ b/crates/nu-protocol/src/shell_error.rs
@@ -109,6 +109,10 @@ pub enum ShellError {
     #[error("Move not possible")]
     #[diagnostic(code(nu::shell::move_not_possible_single), url(docsrs))]
     MoveNotPossibleSingle(String, #[label("{0}")] Span),
+
+    #[error("Create not possible")]
+    #[diagnostic(code(nu::shell::move_not_possible_single), url(docsrs))]
+    CreateNotPossible(String, #[label("{0}")] Span),
 }
 
 impl From<std::io::Error> for ShellError {