add a touch command (#1399)

src/cli.rs

@@ -262,6 +262,7 @@ pub fn create_default_context(
             per_item_command(Help),
             per_item_command(History),
             whole_stream_command(Save),
+            per_item_command(Touch),
             per_item_command(Cpy),
             whole_stream_command(Date),
             per_item_command(Calc),

src/commands.rs

@@ -123,6 +123,7 @@ pub(crate) mod kill;
 pub(crate) use kill::Kill;
 pub(crate) mod clear;
 pub(crate) use clear::Clear;
+pub(crate) mod touch;
 pub(crate) use enter::Enter;
 pub(crate) use env::Env;
 #[allow(unused_imports)]
@@ -195,6 +196,7 @@ pub(crate) use to_toml::ToTOML;
 pub(crate) use to_tsv::ToTSV;
 pub(crate) use to_url::ToURL;
 pub(crate) use to_yaml::ToYAML;
+pub(crate) use touch::Touch;
 pub(crate) use trim::Trim;
 pub(crate) use uniq::Uniq;
 pub(crate) use version::Version;

src/commands/touch.rs

@@ -0,0 +1,55 @@
+use crate::prelude::*;
+use nu_errors::ShellError;
+use nu_protocol::{CallInfo, Signature, SyntaxShape, Value};
+use nu_source::Tagged;
+use std::error::Error;
+use std::fs::OpenOptions;
+use std::path::PathBuf;
+
+pub struct Touch;
+
+#[derive(Deserialize)]
+pub struct TouchArgs {
+    pub target: Tagged<PathBuf>,
+}
+
+impl PerItemCommand for Touch {
+    fn name(&self) -> &str {
+        "touch"
+    }
+    fn signature(&self) -> Signature {
+        Signature::build("touch").required(
+            "filename",
+            SyntaxShape::Path,
+            "the path of the file you want to create",
+        )
+    }
+    fn usage(&self) -> &str {
+        "creates a file"
+    }
+    fn run(
+        &self,
+        call_info: &CallInfo,
+        _registry: &CommandRegistry,
+        raw_args: &RawCommandArgs,
+        _input: Value,
+    ) -> Result<OutputStream, ShellError> {
+        call_info
+            .process(&raw_args.shell_manager, raw_args.ctrl_c.clone(), touch)?
+            .run()
+    }
+}
+fn touch(args: TouchArgs, _context: &RunnablePerItemContext) -> Result<OutputStream, ShellError> {
+    match OpenOptions::new()
+        .write(true)
+        .create(true)
+        .open(&args.target)
+    {
+        Ok(_) => Ok(OutputStream::empty()),
+        Err(err) => Err(ShellError::labeled_error(
+            "File Error",
+            err.description(),
+            &args.target.tag,
+        )),
+    }
+}

tests/commands/mod.rs

@@ -28,6 +28,7 @@ mod save;
 mod sort_by;
 mod split_by;
 mod split_column;
+mod touch;
 mod uniq;
 mod where_;
 mod wrap;

tests/commands/touch.rs

@@ -0,0 +1,19 @@
+use nu_test_support::fs::Stub::EmptyFile;
+use nu_test_support::nu;
+use nu_test_support::playground::Playground;
+
+#[test]
+fn adds_a_file() {
+    Playground::setup("add_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("i_will_be_created.txt")]);
+
+        nu!(
+            cwd: dirs.root(),
+            "touch touch_test/i_will_be_created.txt"
+        );
+
+        let path = dirs.test().join("i_will_be_created.txt");
+
+        assert!(path.exists());
+    })
+}