Merge branch 'nushell:main' into main

Cargo.lock

@@ -98,6 +98,15 @@ dependencies = [
  "regex-automata",
 ]
 
+[[package]]
+name = "byte-unit"
+version = "4.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "063197e6eb4b775b64160dedde7a0986bb2836cce140e9492e9e96f28e18bcd8"
+dependencies = [
+ "utf8-width",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.70"
@@ -119,10 +128,20 @@ dependencies = [
  "libc",
  "num-integer",
  "num-traits",
+ "serde",
  "time",
  "winapi",
 ]
 
+[[package]]
+name = "chrono-humanize"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eddc119501d583fd930cb92144e605f44e0252c38dd89d9247fffa1993375cb"
+dependencies = [
+ "chrono",
+]
+
 [[package]]
 name = "core-foundation-sys"
 version = "0.8.2"
@@ -399,9 +418,9 @@ dependencies = [
 
 [[package]]
 name = "miette"
-version = "3.0.0"
+version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b98aebb9d23c72cb22c089834ea59be059c6f462e844fd9fd18dd0168ad149c"
+checksum = "4786c5b04c6f73e96d88444e7f37e241d99479ea5dd88a4887363ab2e03b4e53"
 dependencies = [
  "atty",
  "backtrace",
@@ -418,9 +437,9 @@ dependencies = [
 
 [[package]]
 name = "miette-derive"
-version = "3.0.0"
+version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9a7cd3347eb52480d4ba59d71ce2b48b8b128034e17068c7e2ff3766c2e87a3"
+checksum = "0ee63a981bc9cde5f26665ffd756b624963bf0b5956e0df51e52ef8f6b5466d6"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -487,6 +506,7 @@ dependencies = [
  "nu-ansi-term",
  "nu-engine",
  "nu-parser",
+ "nu-path",
  "nu-protocol",
  "reedline",
  "thiserror",
@@ -496,6 +516,7 @@ dependencies = [
 name = "nu-command"
 version = "0.1.0"
 dependencies = [
+ "chrono",
  "glob",
  "nu-engine",
  "nu-json",
@@ -549,6 +570,9 @@ dependencies = [
 name = "nu-protocol"
 version = "0.1.0"
 dependencies = [
+ "byte-unit",
+ "chrono",
+ "chrono-humanize",
  "miette",
  "serde",
  "thiserror",
@@ -803,7 +827,7 @@ dependencies = [
 [[package]]
 name = "reedline"
 version = "0.2.0"
-source = "git+https://github.com/jntrnr/reedline?branch=main#93c2146fcf4257c40426bc2f0c6903d4115caaf1"
+source = "git+https://github.com/jntrnr/reedline?branch=main#88bded3417e7f6c1242b444f403448de583357f0"
 dependencies = [
  "chrono",
  "crossterm",
@@ -935,9 +959,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.6.1"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe0f37c9e8f3c5a4a66ad655a93c74daac4ad00c441533bf5c6e7990bb42604e"
+checksum = "1ecab6c735a6bb4139c0caafd0cc3635748bbb3acf4550e8138122099251f309"
 
 [[package]]
 name = "smawk"
@@ -947,9 +971,9 @@ checksum = "f67ad224767faa3c7d8b6d91985b78e70a1324408abcb1cfcc2be4c06bc06043"
 
 [[package]]
 name = "supports-color"
-version = "1.1.1"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32f5b0f9e689dd52e27228469dd68b7416b60d75b7571ae9060a5f4c50048fee"
+checksum = "4872ced36b91d47bae8a214a683fe54e7078875b399dfa251df346c9b547d1f9"
 dependencies = [
  "atty",
  "is_ci",
@@ -966,18 +990,18 @@ dependencies = [
 
 [[package]]
 name = "supports-unicode"
-version = "1.0.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d5fa283a620b255940913bd962cda2e6320e3799041f96ac0d7191ff2b4622f"
+checksum = "a8b945e45b417b125a8ec51f1b7df2f8df7920367700d1f98aedd21e5735f8b2"
 dependencies = [
  "atty",
 ]
 
 [[package]]
 name = "syn"
-version = "1.0.77"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5239bc68e0fef57495900cfea4e8dc75596d9a319d7e16b1e0a440d24e6fe0a0"
+checksum = "a4eac2e6c19f5c3abc0c229bea31ff0b9b091c7b14990e8924b92902a303a0c0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1098,6 +1122,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
+[[package]]
+name = "utf8-width"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cf7d77f457ef8dfa11e4cd5933c5ddb5dc52a94664071951219a97710f0a32b"
+
 [[package]]
 name = "wait-timeout"
 version = "0.2.0"

crates/nu-cli/Cargo.toml

@@ -5,8 +5,10 @@ edition = "2018"
 
 [dependencies]
 nu-engine = { path = "../nu-engine" }
+nu-path = { path = "../nu-path" }
 nu-parser = { path = "../nu-parser" }
 nu-protocol = { path = "../nu-protocol" }
+
 miette = { version = "3.0.0", features = ["fancy"] }
 thiserror = "1.0.29"
 nu-ansi-term = "0.36.0"

crates/nu-cli/src/completions.rs

@@ -8,6 +8,8 @@ use nu_protocol::{
 };
 use reedline::Completer;
 
+const SEP: char = std::path::MAIN_SEPARATOR;
+
 pub struct NuCompleter {
     engine_state: Rc<RefCell<EngineState>>,
 }
@@ -30,6 +32,40 @@ impl Completer for NuCompleter {
 
         for flat in flattened {
             if pos >= flat.0.start && pos <= flat.0.end {
+                let prefix = working_set.get_span_contents(flat.0);
+                if prefix.starts_with(b"$") {
+                    let mut output = vec![];
+
+                    for scope in &working_set.delta.scope {
+                        for v in &scope.vars {
+                            if v.0.starts_with(prefix) {
+                                output.push((
+                                    reedline::Span {
+                                        start: flat.0.start - offset,
+                                        end: flat.0.end - offset,
+                                    },
+                                    String::from_utf8_lossy(v.0).to_string(),
+                                ));
+                            }
+                        }
+                    }
+                    for scope in &engine_state.scope {
+                        for v in &scope.vars {
+                            if v.0.starts_with(prefix) {
+                                output.push((
+                                    reedline::Span {
+                                        start: flat.0.start - offset,
+                                        end: flat.0.end - offset,
+                                    },
+                                    String::from_utf8_lossy(v.0).to_string(),
+                                ));
+                            }
+                        }
+                    }
+
+                    return output;
+                }
+
                 match &flat.1 {
                     nu_parser::FlatShape::Custom(custom_completion) => {
                         let prefix = working_set.get_span_contents(flat.0).to_vec();
@@ -80,6 +116,27 @@ impl Completer for NuCompleter {
                             })
                             .collect();
                     }
+                    nu_parser::FlatShape::Filepath
+                    | nu_parser::FlatShape::GlobPattern
+                    | nu_parser::FlatShape::ExternalArg => {
+                        let prefix = working_set.get_span_contents(flat.0);
+                        let prefix = String::from_utf8_lossy(prefix).to_string();
+
+                        let results = file_path_completion(flat.0, &prefix);
+
+                        return results
+                            .into_iter()
+                            .map(move |x| {
+                                (
+                                    reedline::Span {
+                                        start: x.0.start - offset,
+                                        end: x.0.end - offset,
+                                    },
+                                    x.1,
+                                )
+                            })
+                            .collect();
+                    }
                     _ => {}
                 }
             }
@@ -88,3 +145,56 @@ impl Completer for NuCompleter {
         vec![]
     }
 }
+
+fn file_path_completion(
+    span: nu_protocol::Span,
+    partial: &str,
+) -> Vec<(nu_protocol::Span, String)> {
+    use std::path::{is_separator, Path};
+
+    let (base_dir_name, partial) = {
+        // If partial is only a word we want to search in the current dir
+        let (base, rest) = partial.rsplit_once(is_separator).unwrap_or((".", partial));
+        // On windows, this standardizes paths to use \
+        let mut base = base.replace(is_separator, &SEP.to_string());
+
+        // rsplit_once removes the separator
+        base.push(SEP);
+        (base, rest)
+    };
+
+    let base_dir = nu_path::expand_path(&base_dir_name);
+    // This check is here as base_dir.read_dir() with base_dir == "" will open the current dir
+    // which we don't want in this case (if we did, base_dir would already be ".")
+    if base_dir == Path::new("") {
+        return Vec::new();
+    }
+
+    if let Ok(result) = base_dir.read_dir() {
+        result
+            .filter_map(|entry| {
+                entry.ok().and_then(|entry| {
+                    let mut file_name = entry.file_name().to_string_lossy().into_owned();
+                    if matches(partial, &file_name) {
+                        let mut path = format!("{}{}", base_dir_name, file_name);
+                        if entry.path().is_dir() {
+                            path.push(SEP);
+                            file_name.push(SEP);
+                        }
+
+                        Some((span, path))
+                    } else {
+                        None
+                    }
+                })
+            })
+            .collect()
+    } else {
+        Vec::new()
+    }
+}
+
+fn matches(partial: &str, from: &str) -> bool {
+    from.to_ascii_lowercase()
+        .starts_with(&partial.to_ascii_lowercase())
+}

crates/nu-cli/src/syntax_highlight.rs

@@ -81,6 +81,14 @@ impl Highlighter for NuHighlighter {
                     Style::new().fg(nu_ansi_term::Color::Yellow).bold(),
                     next_token,
                 )),
+                FlatShape::Filepath => output.push((
+                    Style::new().fg(nu_ansi_term::Color::Yellow).bold(),
+                    next_token,
+                )),
+                FlatShape::GlobPattern => output.push((
+                    Style::new().fg(nu_ansi_term::Color::Yellow).bold(),
+                    next_token,
+                )),
                 FlatShape::Variable => output.push((
                     Style::new().fg(nu_ansi_term::Color::Blue).bold(),
                     next_token,

crates/nu-command/Cargo.toml

@@ -16,3 +16,4 @@ nu-table = { path = "../nu-table" }
 glob = "0.3.0"
 thiserror = "1.0.29"
 sysinfo = "0.20.4"
+chrono = { version="0.4.19", features=["serde"] }

crates/nu-command/src/filesystem/cd.rs

@@ -15,7 +15,7 @@ impl Command for Cd {
     }
 
     fn signature(&self) -> nu_protocol::Signature {
-        Signature::build("cd").optional("path", SyntaxShape::FilePath, "the path to change to")
+        Signature::build("cd").optional("path", SyntaxShape::Filepath, "the path to change to")
     }
 
     fn run(
@@ -28,7 +28,7 @@ impl Command for Cd {
 
         let path = match path {
             Some(path) => {
-                let path = nu_path::expand_tilde(path);
+                let path = nu_path::expand_path(path);
                 path.to_string_lossy().to_string()
             }
             None => {

crates/nu-command/src/filesystem/ls.rs

@@ -1,3 +1,4 @@
+use chrono::{DateTime, Utc};
 use nu_engine::eval_expression;
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EvaluationContext};
@@ -31,7 +32,17 @@ impl Command for Ls {
     ) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
         let pattern = if let Some(expr) = call.positional.get(0) {
             let result = eval_expression(context, expr)?;
-            result.as_string()?
+            let mut result = result.as_string()?;
+
+            let path = std::path::Path::new(&result);
+            if path.is_dir() {
+                if !result.ends_with(std::path::MAIN_SEPARATOR) {
+                    result.push(std::path::MAIN_SEPARATOR);
+                }
+                result.push('*');
+            }
+
+            result
         } else {
             "*".into()
         };
@@ -49,25 +60,39 @@ impl Command for Ls {
                             let is_dir = metadata.is_dir();
                             let filesize = metadata.len();
 
+                            let mut cols = vec!["name".into(), "type".into(), "size".into()];
+
+                            let mut vals = vec![
+                                Value::String {
+                                    val: path.to_string_lossy().to_string(),
+                                    span: call_span,
+                                },
+                                if is_file {
+                                    Value::string("File", call_span)
+                                } else if is_dir {
+                                    Value::string("Dir", call_span)
+                                } else {
+                                    Value::Nothing { span: call_span }
+                                },
+                                Value::Filesize {
+                                    val: filesize as i64,
+                                    span: call_span,
+                                },
+                            ];
+
+                            if let Ok(date) = metadata.modified() {
+                                let utc: DateTime<Utc> = date.into();
+
+                                cols.push("modified".into());
+                                vals.push(Value::Date {
+                                    val: utc.into(),
+                                    span: call_span,
+                                });
+                            }
+
                             Value::Record {
-                                cols: vec!["name".into(), "type".into(), "size".into()],
+                                cols,
-                                vals: vec![
+                                vals,
-                                    Value::String {
-                                        val: path.to_string_lossy().to_string(),
-                                        span: call_span,
-                                    },
-                                    if is_file {
-                                        Value::string("file", call_span)
-                                    } else if is_dir {
-                                        Value::string("dir", call_span)
-                                    } else {
-                                        Value::Nothing { span: call_span }
-                                    },
-                                    Value::Filesize {
-                                        val: filesize,
-                                        span: call_span,
-                                    },
-                                ],
                                 span: call_span,
                             }
                         }

crates/nu-command/src/system/ps.rs

@@ -86,13 +86,13 @@ fn run_ps(call: &Call) -> Result<Value, ShellError> {
 
             cols.push("mem".into());
             vals.push(Value::Filesize {
-                val: result.memory() * 1000,
+                val: result.memory() as i64 * 1000,
                 span,
             });
 
             cols.push("virtual".into());
             vals.push(Value::Filesize {
-                val: result.virtual_memory() * 1000,
+                val: result.virtual_memory() as i64 * 1000,
                 span,
             });
 

crates/nu-command/src/system/sys.rs

@@ -112,13 +112,13 @@ pub fn disks(sys: &mut System, span: Span) -> Option<Value> {
 
         cols.push("total".into());
         vals.push(Value::Filesize {
-            val: disk.total_space(),
+            val: disk.total_space() as i64,
             span,
         });
 
         cols.push("free".into());
         vals.push(Value::Filesize {
-            val: disk.available_space(),
+            val: disk.available_space() as i64,
             span,
         });
 
@@ -148,13 +148,13 @@ pub fn net(sys: &mut System, span: Span) -> Option<Value> {
 
         cols.push("sent".into());
         vals.push(Value::Filesize {
-            val: data.total_transmitted(),
+            val: data.total_transmitted() as i64,
             span,
         });
 
         cols.push("recv".into());
         vals.push(Value::Filesize {
-            val: data.total_received(),
+            val: data.total_received() as i64,
             span,
         });
 
@@ -215,25 +215,25 @@ pub fn mem(sys: &mut System, span: Span) -> Option<Value> {
 
     cols.push("total".into());
     vals.push(Value::Filesize {
-        val: total_mem * 1000,
+        val: total_mem as i64 * 1000,
         span,
     });
 
     cols.push("free".into());
     vals.push(Value::Filesize {
-        val: free_mem * 1000,
+        val: free_mem as i64 * 1000,
         span,
     });
 
     cols.push("swap total".into());
     vals.push(Value::Filesize {
-        val: total_swap * 1000,
+        val: total_swap as i64 * 1000,
         span,
     });
 
     cols.push("swap free".into());
     vals.push(Value::Filesize {
-        val: free_swap * 1000,
+        val: free_swap as i64 * 1000,
         span,
     });
 
@@ -276,7 +276,7 @@ pub fn host(sys: &mut System, span: Span) -> Option<Value> {
     }
     cols.push("uptime".into());
     vals.push(Value::Duration {
-        val: 1000000000 * sys.uptime() as u64,
+        val: 1000000000 * sys.uptime() as i64,
         span,
     });
 

crates/nu-engine/src/eval.rs

@@ -1,6 +1,6 @@
 use nu_protocol::ast::{Block, Call, Expr, Expression, Operator, Statement};
 use nu_protocol::engine::EvaluationContext;
-use nu_protocol::{Range, ShellError, Span, Type, Value};
+use nu_protocol::{Range, ShellError, Span, Type, Unit, Value};
 
 pub fn eval_operator(op: &Expression) -> Result<Operator, ShellError> {
     match op {
@@ -123,6 +123,10 @@ pub fn eval_expression(
             val: *f,
             span: expr.span,
         }),
+        Expr::ValueWithUnit(e, unit) => match eval_expression(context, e)? {
+            Value::Int { val, .. } => Ok(compute(val, unit.item, unit.span)),
+            _ => Err(ShellError::CantConvert("unit value".into(), e.span)),
+        },
         Expr::Range(from, next, to, operator) => {
             let from = if let Some(f) = from {
                 eval_expression(context, f)?
@@ -240,6 +244,14 @@ pub fn eval_expression(
             val: s.clone(),
             span: expr.span,
         }),
+        Expr::Filepath(s) => Ok(Value::String {
+            val: s.clone(),
+            span: expr.span,
+        }),
+        Expr::GlobPattern(s) => Ok(Value::String {
+            val: s.clone(),
+            span: expr.span,
+        }),
         Expr::Signature(_) => Ok(Value::Nothing { span: expr.span }),
         Expr::Garbage => Ok(Value::Nothing { span: expr.span }),
     }
@@ -283,3 +295,80 @@ pub fn eval_block(
 
     Ok(input)
 }
+
+pub fn compute(size: i64, unit: Unit, span: Span) -> Value {
+    match unit {
+        Unit::Byte => Value::Filesize { val: size, span },
+        Unit::Kilobyte => Value::Filesize {
+            val: size * 1000,
+            span,
+        },
+        Unit::Megabyte => Value::Filesize {
+            val: size * 1000 * 1000,
+            span,
+        },
+        Unit::Gigabyte => Value::Filesize {
+            val: size * 1000 * 1000 * 1000,
+            span,
+        },
+        Unit::Terabyte => Value::Filesize {
+            val: size * 1000 * 1000 * 1000 * 1000,
+            span,
+        },
+        Unit::Petabyte => Value::Filesize {
+            val: size * 1000 * 1000 * 1000 * 1000 * 1000,
+            span,
+        },
+
+        Unit::Kibibyte => Value::Filesize {
+            val: size * 1024,
+            span,
+        },
+        Unit::Mebibyte => Value::Filesize {
+            val: size * 1024 * 1024,
+            span,
+        },
+        Unit::Gibibyte => Value::Filesize {
+            val: size * 1024 * 1024 * 1024,
+            span,
+        },
+        Unit::Tebibyte => Value::Filesize {
+            val: size * 1024 * 1024 * 1024 * 1024,
+            span,
+        },
+        Unit::Pebibyte => Value::Filesize {
+            val: size * 1024 * 1024 * 1024 * 1024 * 1024,
+            span,
+        },
+
+        Unit::Nanosecond => Value::Duration { val: size, span },
+        Unit::Microsecond => Value::Duration {
+            val: size * 1000,
+            span,
+        },
+        Unit::Millisecond => Value::Duration {
+            val: size * 1000 * 1000,
+            span,
+        },
+        Unit::Second => Value::Duration {
+            val: size * 1000 * 1000 * 1000,
+            span,
+        },
+        Unit::Minute => Value::Duration {
+            val: size * 1000 * 1000 * 1000 * 60,
+            span,
+        },
+        Unit::Hour => Value::Duration {
+            val: size * 1000 * 1000 * 1000 * 60 * 60,
+            span,
+        },
+        Unit::Day => Value::Duration {
+            val: size * 1000 * 1000 * 1000 * 60 * 60 * 24,
+            span,
+        },
+        Unit::Week => Value::Duration {
+            val: size * 1000 * 1000 * 1000 * 60 * 60 * 24 * 7,
+            span,
+        },
+    }
+}

crates/nu-parser/src/flatten.rs

@@ -15,6 +15,8 @@ pub enum FlatShape {
     Operator,
     Signature,
     String,
+    Filepath,
+    GlobPattern,
     Variable,
     Custom(String),
 }
@@ -79,6 +81,12 @@ pub fn flatten_expression(
         Expr::Float(_) => {
             vec![(expr.span, FlatShape::Float)]
         }
+        Expr::ValueWithUnit(x, unit) => {
+            let mut output = flatten_expression(working_set, x);
+            output.push((unit.span, FlatShape::String));
+
+            output
+        }
         Expr::CellPath(cell_path) => {
             let mut output = vec![];
             for path_element in &cell_path.members {
@@ -118,7 +126,12 @@ pub fn flatten_expression(
         Expr::Bool(_) => {
             vec![(expr.span, FlatShape::Bool)]
         }
-
+        Expr::Filepath(_) => {
+            vec![(expr.span, FlatShape::Filepath)]
+        }
+        Expr::GlobPattern(_) => {
+            vec![(expr.span, FlatShape::GlobPattern)]
+        }
         Expr::List(list) => {
             let mut output = vec![];
             for l in list {

crates/nu-parser/src/parse_keywords.rs

@@ -600,12 +600,90 @@ pub fn parse_hide(
         let (name_expr, err) = parse_string(working_set, spans[1]);
         error = error.or(err);
 
-        let name_bytes: Vec<u8> = working_set.get_span_contents(spans[1]).into();
+        let (import_pattern, err) = parse_import_pattern(working_set, spans[1]);
+        error = error.or(err);
 
-        // TODO: Do the import pattern stuff for bulk-hiding
+        let exported_names: Vec<Vec<u8>> =
+            if let Some(block_id) = working_set.find_module(&import_pattern.head) {
+                working_set
+                    .get_block(block_id)
+                    .exports
+                    .iter()
+                    .map(|(name, _)| name.clone())
+                    .collect()
+            } else if import_pattern.members.is_empty() {
+                // The pattern head can be e.g. a function name, not just a module
+                vec![import_pattern.head.clone()]
+            } else {
+                return (
+                    garbage_statement(spans),
+                    Some(ParseError::ModuleNotFound(spans[1])),
+                );
+            };
 
-        if working_set.hide_decl(&name_bytes).is_none() {
+        // This kind of inverts the import pattern matching found in parse_use()
-            error = error.or_else(|| Some(ParseError::UnknownCommand(spans[1])));
+        let names_to_hide = if import_pattern.members.is_empty() {
+            exported_names
+        } else {
+            match &import_pattern.members[0] {
+                ImportPatternMember::Glob { .. } => exported_names
+                    .into_iter()
+                    .map(|name| {
+                        let mut new_name = import_pattern.head.to_vec();
+                        new_name.push(b'.');
+                        new_name.extend(&name);
+                        new_name
+                    })
+                    .collect(),
+                ImportPatternMember::Name { name, span } => {
+                    let new_exports: Vec<Vec<u8>> = exported_names
+                        .into_iter()
+                        .filter(|n| n == name)
+                        .map(|n| {
+                            let mut new_name = import_pattern.head.to_vec();
+                            new_name.push(b'.');
+                            new_name.extend(&n);
+                            new_name
+                        })
+                        .collect();
+
+                    if new_exports.is_empty() {
+                        error = error.or(Some(ParseError::ExportNotFound(*span)))
+                    }
+
+                    new_exports
+                }
+                ImportPatternMember::List { names } => {
+                    let mut output = vec![];
+
+                    for (name, span) in names {
+                        let mut new_exports: Vec<Vec<u8>> = exported_names
+                            .iter()
+                            .filter_map(|n| if n == name { Some(n.clone()) } else { None })
+                            .map(|n| {
+                                let mut new_name = import_pattern.head.to_vec();
+                                new_name.push(b'.');
+                                new_name.extend(n);
+                                new_name
+                            })
+                            .collect();
+
+                        if new_exports.is_empty() {
+                            error = error.or(Some(ParseError::ExportNotFound(*span)))
+                        } else {
+                            output.append(&mut new_exports)
+                        }
+                    }
+
+                    output
+                }
+            }
+        };
+
+        for name in names_to_hide {
+            if working_set.hide_decl(&name).is_none() {
+                error = error.or_else(|| Some(ParseError::UnknownCommand(spans[1])));
+            }
         }
 
         // Create the Hide command call

crates/nu-parser/src/parser.rs

@@ -10,7 +10,7 @@ use nu_protocol::{
         Operator, PathMember, Pipeline, RangeInclusion, RangeOperator, Statement,
     },
     engine::StateWorkingSet,
-    span, Flag, PositionalArg, Signature, Span, SyntaxShape, Type, VarId,
+    span, Flag, PositionalArg, Signature, Span, Spanned, SyntaxShape, Type, Unit, VarId,
 };
 
 use crate::parse_keywords::{
@@ -1320,6 +1320,255 @@ pub fn parse_full_cell_path(
     }
 }
 
+pub fn parse_filepath(
+    working_set: &mut StateWorkingSet,
+    span: Span,
+) -> (Expression, Option<ParseError>) {
+    let bytes = working_set.get_span_contents(span);
+    let bytes = if (bytes.starts_with(b"\"") && bytes.ends_with(b"\"") && bytes.len() > 1)
+        || (bytes.starts_with(b"\'") && bytes.ends_with(b"\'") && bytes.len() > 1)
+    {
+        &bytes[1..(bytes.len() - 1)]
+    } else {
+        bytes
+    };
+
+    if let Ok(token) = String::from_utf8(bytes.into()) {
+        (
+            Expression {
+                expr: Expr::Filepath(token),
+                span,
+                ty: Type::String,
+                custom_completion: None,
+            },
+            None,
+        )
+    } else {
+        (
+            garbage(span),
+            Some(ParseError::Expected("string".into(), span)),
+        )
+    }
+}
+
+/// Parse a duration type, eg '10day'
+pub fn parse_duration(
+    working_set: &mut StateWorkingSet,
+    span: Span,
+) -> (Expression, Option<ParseError>) {
+    fn parse_decimal_str_to_number(decimal: &str) -> Option<i64> {
+        let string_to_parse = format!("0.{}", decimal);
+        if let Ok(x) = string_to_parse.parse::<f64>() {
+            return Some((1_f64 / x) as i64);
+        }
+        None
+    }
+
+    let bytes = working_set.get_span_contents(span);
+    let token = String::from_utf8_lossy(bytes).to_string();
+
+    let unit_groups = [
+        (Unit::Nanosecond, "NS", None),
+        (Unit::Microsecond, "US", Some((Unit::Nanosecond, 1000))),
+        (Unit::Millisecond, "MS", Some((Unit::Microsecond, 1000))),
+        (Unit::Second, "SEC", Some((Unit::Millisecond, 1000))),
+        (Unit::Minute, "MIN", Some((Unit::Second, 60))),
+        (Unit::Hour, "HR", Some((Unit::Minute, 60))),
+        (Unit::Day, "DAY", Some((Unit::Minute, 1440))),
+        (Unit::Week, "WK", Some((Unit::Day, 7))),
+    ];
+    if let Some(unit) = unit_groups
+        .iter()
+        .find(|&x| token.to_uppercase().ends_with(x.1))
+    {
+        let mut lhs = token.clone();
+        for _ in 0..unit.1.len() {
+            lhs.pop();
+        }
+
+        let input: Vec<&str> = lhs.split('.').collect();
+        let (value, unit_to_use) = match &input[..] {
+            [number_str] => (number_str.parse::<i64>().ok(), unit.0),
+            [number_str, decimal_part_str] => match unit.2 {
+                Some(unit_to_convert_to) => match (
+                    number_str.parse::<i64>(),
+                    parse_decimal_str_to_number(decimal_part_str),
+                ) {
+                    (Ok(number), Some(decimal_part)) => (
+                        Some(
+                            (number * unit_to_convert_to.1) + (unit_to_convert_to.1 / decimal_part),
+                        ),
+                        unit_to_convert_to.0,
+                    ),
+                    _ => (None, unit.0),
+                },
+                None => (None, unit.0),
+            },
+            _ => (None, unit.0),
+        };
+
+        if let Some(x) = value {
+            let lhs_span = Span::new(span.start, span.start + lhs.len());
+            let unit_span = Span::new(span.start + lhs.len(), span.end);
+            return (
+                Expression {
+                    expr: Expr::ValueWithUnit(
+                        Box::new(Expression {
+                            expr: Expr::Int(x),
+                            span: lhs_span,
+                            ty: Type::Number,
+                            custom_completion: None,
+                        }),
+                        Spanned {
+                            item: unit_to_use,
+                            span: unit_span,
+                        },
+                    ),
+                    span,
+                    ty: Type::Duration,
+                    custom_completion: None,
+                },
+                None,
+            );
+        }
+    }
+
+    (
+        garbage(span),
+        Some(ParseError::Mismatch(
+            "duration".into(),
+            "non-duration unit".into(),
+            span,
+        )),
+    )
+}
+
+/// Parse a unit type, eg '10kb'
+pub fn parse_filesize(
+    working_set: &mut StateWorkingSet,
+    span: Span,
+) -> (Expression, Option<ParseError>) {
+    fn parse_decimal_str_to_number(decimal: &str) -> Option<i64> {
+        let string_to_parse = format!("0.{}", decimal);
+        if let Ok(x) = string_to_parse.parse::<f64>() {
+            return Some((1_f64 / x) as i64);
+        }
+        None
+    }
+
+    let bytes = working_set.get_span_contents(span);
+    let token = String::from_utf8_lossy(bytes).to_string();
+
+    let unit_groups = [
+        (Unit::Kilobyte, "KB", Some((Unit::Byte, 1000))),
+        (Unit::Megabyte, "MB", Some((Unit::Kilobyte, 1000))),
+        (Unit::Gigabyte, "GB", Some((Unit::Megabyte, 1000))),
+        (Unit::Terabyte, "TB", Some((Unit::Gigabyte, 1000))),
+        (Unit::Petabyte, "PB", Some((Unit::Terabyte, 1000))),
+        (Unit::Kibibyte, "KIB", Some((Unit::Byte, 1024))),
+        (Unit::Mebibyte, "MIB", Some((Unit::Kibibyte, 1024))),
+        (Unit::Gibibyte, "GIB", Some((Unit::Mebibyte, 1024))),
+        (Unit::Tebibyte, "TIB", Some((Unit::Gibibyte, 1024))),
+        (Unit::Pebibyte, "PIB", Some((Unit::Tebibyte, 1024))),
+        (Unit::Byte, "B", None),
+    ];
+    if let Some(unit) = unit_groups
+        .iter()
+        .find(|&x| token.to_uppercase().ends_with(x.1))
+    {
+        let mut lhs = token.clone();
+        for _ in 0..unit.1.len() {
+            lhs.pop();
+        }
+
+        let input: Vec<&str> = lhs.split('.').collect();
+        let (value, unit_to_use) = match &input[..] {
+            [number_str] => (number_str.parse::<i64>().ok(), unit.0),
+            [number_str, decimal_part_str] => match unit.2 {
+                Some(unit_to_convert_to) => match (
+                    number_str.parse::<i64>(),
+                    parse_decimal_str_to_number(decimal_part_str),
+                ) {
+                    (Ok(number), Some(decimal_part)) => (
+                        Some(
+                            (number * unit_to_convert_to.1) + (unit_to_convert_to.1 / decimal_part),
+                        ),
+                        unit_to_convert_to.0,
+                    ),
+                    _ => (None, unit.0),
+                },
+                None => (None, unit.0),
+            },
+            _ => (None, unit.0),
+        };
+
+        if let Some(x) = value {
+            let lhs_span = Span::new(span.start, span.start + lhs.len());
+            let unit_span = Span::new(span.start + lhs.len(), span.end);
+            return (
+                Expression {
+                    expr: Expr::ValueWithUnit(
+                        Box::new(Expression {
+                            expr: Expr::Int(x),
+                            span: lhs_span,
+                            ty: Type::Number,
+                            custom_completion: None,
+                        }),
+                        Spanned {
+                            item: unit_to_use,
+                            span: unit_span,
+                        },
+                    ),
+                    span,
+                    ty: Type::Filesize,
+                    custom_completion: None,
+                },
+                None,
+            );
+        }
+    }
+
+    (
+        garbage(span),
+        Some(ParseError::Mismatch(
+            "filesize".into(),
+            "non-filesize unit".into(),
+            span,
+        )),
+    )
+}
+
+pub fn parse_glob_pattern(
+    working_set: &mut StateWorkingSet,
+    span: Span,
+) -> (Expression, Option<ParseError>) {
+    let bytes = working_set.get_span_contents(span);
+    let bytes = if (bytes.starts_with(b"\"") && bytes.ends_with(b"\"") && bytes.len() > 1)
+        || (bytes.starts_with(b"\'") && bytes.ends_with(b"\'") && bytes.len() > 1)
+    {
+        &bytes[1..(bytes.len() - 1)]
+    } else {
+        bytes
+    };
+
+    if let Ok(token) = String::from_utf8(bytes.into()) {
+        (
+            Expression {
+                expr: Expr::GlobPattern(token),
+                span,
+                ty: Type::String,
+                custom_completion: None,
+            },
+            None,
+        )
+    } else {
+        (
+            garbage(span),
+            Some(ParseError::Expected("string".into(), span)),
+        )
+    }
+}
+
 pub fn parse_string(
     working_set: &mut StateWorkingSet,
     span: Span,
@@ -1364,7 +1613,7 @@ pub fn parse_shape_name(
         b"number" => SyntaxShape::Number,
         b"range" => SyntaxShape::Range,
         b"int" => SyntaxShape::Int,
-        b"path" => SyntaxShape::FilePath,
+        b"path" => SyntaxShape::Filepath,
         b"glob" => SyntaxShape::GlobPattern,
         b"block" => SyntaxShape::Block(None), //FIXME
         b"cond" => SyntaxShape::RowCondition,
@@ -2319,10 +2568,12 @@ pub fn parse_value(
         }
         SyntaxShape::Number => parse_number(bytes, span),
         SyntaxShape::Int => parse_int(bytes, span),
+        SyntaxShape::Duration => parse_duration(working_set, span),
+        SyntaxShape::Filesize => parse_filesize(working_set, span),
         SyntaxShape::Range => parse_range(working_set, span),
-        SyntaxShape::String | SyntaxShape::GlobPattern | SyntaxShape::FilePath => {
+        SyntaxShape::Filepath => parse_filepath(working_set, span),
-            parse_string(working_set, span)
+        SyntaxShape::GlobPattern => parse_glob_pattern(working_set, span),
-        }
+        SyntaxShape::String => parse_string(working_set, span),
         SyntaxShape::Block(_) => {
             if bytes.starts_with(b"{") {
                 parse_block_expression(working_set, shape, span)

crates/nu-parser/src/type_check.rs

@@ -29,6 +29,9 @@ pub fn math_result_type(
                 (Type::Int, Type::Float) => (Type::Float, None),
                 (Type::Float, Type::Float) => (Type::Float, None),
                 (Type::String, Type::String) => (Type::String, None),
+                (Type::Duration, Type::Duration) => (Type::Duration, None),
+                (Type::Filesize, Type::Filesize) => (Type::Filesize, None),
+
                 (Type::Unknown, _) => (Type::Unknown, None),
                 (_, Type::Unknown) => (Type::Unknown, None),
                 (Type::Int, _) => {
@@ -64,6 +67,9 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Float, None),
                 (Type::Int, Type::Float) => (Type::Float, None),
                 (Type::Float, Type::Float) => (Type::Float, None),
+                (Type::Duration, Type::Duration) => (Type::Duration, None),
+                (Type::Filesize, Type::Filesize) => (Type::Filesize, None),
+
                 (Type::Unknown, _) => (Type::Unknown, None),
                 (_, Type::Unknown) => (Type::Unknown, None),
                 _ => {
@@ -85,6 +91,7 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Float, None),
                 (Type::Int, Type::Float) => (Type::Float, None),
                 (Type::Float, Type::Float) => (Type::Float, None),
+
                 (Type::Unknown, _) => (Type::Unknown, None),
                 (_, Type::Unknown) => (Type::Unknown, None),
                 _ => {
@@ -106,6 +113,7 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Float, None),
                 (Type::Int, Type::Float) => (Type::Float, None),
                 (Type::Float, Type::Float) => (Type::Float, None),
+
                 (Type::Unknown, _) => (Type::Unknown, None),
                 (_, Type::Unknown) => (Type::Unknown, None),
                 _ => {
@@ -127,6 +135,9 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Bool, None),
                 (Type::Int, Type::Float) => (Type::Bool, None),
                 (Type::Float, Type::Float) => (Type::Bool, None),
+                (Type::Duration, Type::Duration) => (Type::Bool, None),
+                (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+
                 (Type::Unknown, _) => (Type::Bool, None),
                 (_, Type::Unknown) => (Type::Bool, None),
                 _ => {
@@ -148,6 +159,9 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Bool, None),
                 (Type::Int, Type::Float) => (Type::Bool, None),
                 (Type::Float, Type::Float) => (Type::Bool, None),
+                (Type::Duration, Type::Duration) => (Type::Bool, None),
+                (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+
                 (Type::Unknown, _) => (Type::Bool, None),
                 (_, Type::Unknown) => (Type::Bool, None),
                 _ => {
@@ -169,6 +183,9 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Bool, None),
                 (Type::Int, Type::Float) => (Type::Bool, None),
                 (Type::Float, Type::Float) => (Type::Bool, None),
+                (Type::Duration, Type::Duration) => (Type::Bool, None),
+                (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+
                 (Type::Unknown, _) => (Type::Bool, None),
                 (_, Type::Unknown) => (Type::Bool, None),
                 _ => {
@@ -190,6 +207,9 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Bool, None),
                 (Type::Int, Type::Float) => (Type::Bool, None),
                 (Type::Float, Type::Float) => (Type::Bool, None),
+                (Type::Duration, Type::Duration) => (Type::Bool, None),
+                (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+
                 (Type::Unknown, _) => (Type::Bool, None),
                 (_, Type::Unknown) => (Type::Bool, None),
                 _ => {
@@ -209,6 +229,9 @@ pub fn math_result_type(
             Operator::Equal => match (&lhs.ty, &rhs.ty) {
                 (Type::Float, Type::Int) => (Type::Bool, None),
                 (Type::Int, Type::Float) => (Type::Bool, None),
+                (Type::Duration, Type::Duration) => (Type::Bool, None),
+                (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+
                 (x, y) if x == y => (Type::Bool, None),
                 (Type::Unknown, _) => (Type::Bool, None),
                 (_, Type::Unknown) => (Type::Bool, None),
@@ -231,6 +254,9 @@ pub fn math_result_type(
                 (Type::Float, Type::Int) => (Type::Bool, None),
                 (Type::Int, Type::Float) => (Type::Bool, None),
                 (Type::Float, Type::Float) => (Type::Bool, None),
+                (Type::Duration, Type::Duration) => (Type::Bool, None),
+                (Type::Filesize, Type::Filesize) => (Type::Bool, None),
+
                 (Type::Unknown, _) => (Type::Bool, None),
                 (_, Type::Unknown) => (Type::Bool, None),
                 _ => {

crates/nu-protocol/Cargo.toml

@@ -9,3 +9,6 @@ edition = "2018"
 thiserror = "1.0.29"
 miette = "3.0.0"
 serde = {version = "1.0.130", features = ["derive"]}
+chrono = { version="0.4.19", features=["serde"] }
+chrono-humanize = "0.2.1"
+byte-unit = "4.0.9"

crates/nu-protocol/src/ast/expr.rs

@@ -1,5 +1,5 @@
 use super::{Call, CellPath, Expression, FullCellPath, Operator, RangeOperator};
-use crate::{BlockId, Signature, Span, VarId};
+use crate::{BlockId, Signature, Span, Spanned, Unit, VarId};
 
 #[derive(Debug, Clone)]
 pub enum Expr {
@@ -23,6 +23,9 @@ pub enum Expr {
     List(Vec<Expression>),
     Table(Vec<Expression>, Vec<Vec<Expression>>),
     Keyword(Vec<u8>, Span, Box<Expression>),
+    ValueWithUnit(Box<Expression>, Spanned<Unit>),
+    Filepath(String),
+    GlobPattern(String),
     String(String), // FIXME: improve this in the future?
     CellPath(CellPath),
     FullCellPath(Box<FullCellPath>),

crates/nu-protocol/src/engine/engine_state.rs

@@ -12,12 +12,12 @@ pub struct EngineState {
     vars: Vec<Type>,
     decls: Vec<Box<dyn Command>>,
     blocks: Vec<Block>,
-    scope: Vec<ScopeFrame>,
+    pub scope: Vec<ScopeFrame>,
 }
 
 #[derive(Debug)]
 pub struct ScopeFrame {
-    vars: HashMap<Vec<u8>, VarId>,
+    pub vars: HashMap<Vec<u8>, VarId>,
     decls: HashMap<Vec<u8>, DeclId>,
     aliases: HashMap<Vec<u8>, Vec<Span>>,
     modules: HashMap<Vec<u8>, BlockId>,
@@ -375,7 +375,7 @@ impl<'a> StateWorkingSet<'a> {
 
             if let Some(decl_id) = scope.decls.get(name) {
                 if !hiding.contains(decl_id) {
-                    // Do not hide already hidden decl
+                    // Hide decl only if it's not already hidden
                     last_scope_frame.hiding.insert(*decl_id);
                     return Some(*decl_id);
                 }
@@ -409,8 +409,6 @@ impl<'a> StateWorkingSet<'a> {
     }
 
     pub fn activate_overlay(&mut self, overlay: Vec<(Vec<u8>, DeclId)>) {
-        // TODO: This will overwrite all existing definitions in a scope. When we add deactivate,
-        // we need to re-think how make it recoverable.
         let scope_frame = self
             .delta
             .scope

crates/nu-protocol/src/span.rs

@@ -1,7 +1,11 @@
 use miette::SourceSpan;
 use serde::{Deserialize, Serialize};
 
-pub struct Spanned<T> {
+#[derive(Clone, Debug)]
+pub struct Spanned<T>
+where
+    T: Clone + std::fmt::Debug,
+{
     pub item: T,
     pub span: Span,
 }

crates/nu-protocol/src/syntax_shape.rs

@@ -28,7 +28,7 @@ pub enum SyntaxShape {
     Int,
 
     /// A filepath is allowed
-    FilePath,
+    Filepath,
 
     /// A glob pattern is allowed, eg `foo*`
     GlobPattern,
@@ -86,7 +86,7 @@ impl SyntaxShape {
             SyntaxShape::Custom(custom, _) => custom.to_type(),
             SyntaxShape::Duration => Type::Duration,
             SyntaxShape::Expression => Type::Unknown,
-            SyntaxShape::FilePath => Type::String,
+            SyntaxShape::Filepath => Type::String,
             SyntaxShape::Filesize => Type::Filesize,
             SyntaxShape::FullCellPath => Type::Unknown,
             SyntaxShape::GlobPattern => Type::String,

crates/nu-protocol/src/ty.rs

@@ -12,7 +12,7 @@ pub enum Type {
     Block,
     CellPath,
     Duration,
-    FilePath,
+    Date,
     Filesize,
     List(Box<Type>),
     Number,
@@ -31,8 +31,8 @@ impl Display for Type {
             Type::Block => write!(f, "block"),
             Type::Bool => write!(f, "bool"),
             Type::CellPath => write!(f, "cell path"),
+            Type::Date => write!(f, "date"),
             Type::Duration => write!(f, "duration"),
-            Type::FilePath => write!(f, "filepath"),
             Type::Filesize => write!(f, "filesize"),
             Type::Float => write!(f, "float"),
             Type::Int => write!(f, "int"),

crates/nu-protocol/src/value/mod.rs

@@ -1,11 +1,15 @@
 mod range;
 mod row;
 mod stream;
+mod unit;
 
+use chrono::{DateTime, FixedOffset};
+use chrono_humanize::HumanTime;
 pub use range::*;
 pub use row::*;
 use serde::{Deserialize, Serialize};
 pub use stream::*;
+pub use unit::*;
 
 use std::fmt::Debug;
 
@@ -26,11 +30,15 @@ pub enum Value {
         span: Span,
     },
     Filesize {
-        val: u64,
+        val: i64,
         span: Span,
     },
     Duration {
-        val: u64,
+        val: i64,
+        span: Span,
+    },
+    Date {
+        val: DateTime<FixedOffset>,
         span: Span,
     },
     Range {
@@ -95,6 +103,7 @@ impl Value {
             Value::Float { span, .. } => *span,
             Value::Filesize { span, .. } => *span,
             Value::Duration { span, .. } => *span,
+            Value::Date { span, .. } => *span,
             Value::Range { span, .. } => *span,
             Value::String { span, .. } => *span,
             Value::Record { span, .. } => *span,
@@ -115,6 +124,7 @@ impl Value {
             Value::Float { span, .. } => *span = new_span,
             Value::Filesize { span, .. } => *span = new_span,
             Value::Duration { span, .. } => *span = new_span,
+            Value::Date { span, .. } => *span = new_span,
             Value::Range { span, .. } => *span = new_span,
             Value::String { span, .. } => *span = new_span,
             Value::Record { span, .. } => *span = new_span,
@@ -138,6 +148,7 @@ impl Value {
             Value::Float { .. } => Type::Float,
             Value::Filesize { .. } => Type::Filesize,
             Value::Duration { .. } => Type::Duration,
+            Value::Date { .. } => Type::Date,
             Value::Range { .. } => Type::Range,
             Value::String { .. } => Type::String,
             Value::Record { cols, vals, .. } => {
@@ -159,8 +170,9 @@ impl Value {
             Value::Bool { val, .. } => val.to_string(),
             Value::Int { val, .. } => val.to_string(),
             Value::Float { val, .. } => val.to_string(),
-            Value::Filesize { val, .. } => format!("{} bytes", val),
+            Value::Filesize { val, .. } => format_filesize(val),
-            Value::Duration { val, .. } => format!("{} ns", val),
+            Value::Duration { val, .. } => format_duration(val),
+            Value::Date { val, .. } => HumanTime::from(val).to_string(),
             Value::Range { val, .. } => {
                 format!(
                     "range: [{}]",
@@ -202,6 +214,7 @@ impl Value {
             Value::Float { val, .. } => val.to_string(),
             Value::Filesize { val, .. } => format!("{} bytes", val),
             Value::Duration { val, .. } => format!("{} ns", val),
+            Value::Date { val, .. } => format!("{:?}", val),
             Value::Range { val, .. } => val
                 .into_iter()
                 .map(|x| x.into_string())
@@ -390,6 +403,18 @@ impl Value {
                 val: lhs.to_string() + rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Duration {
+                    val: *lhs + *rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Filesize {
+                    val: *lhs + *rhs,
+                    span,
+                })
+            }
 
             _ => Err(ShellError::OperatorMismatch {
                 op_span: op,
@@ -420,6 +445,18 @@ impl Value {
                 val: lhs - rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Duration {
+                    val: *lhs - *rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Filesize {
+                    val: *lhs - *rhs,
+                    span,
+                })
+            }
 
             _ => Err(ShellError::OperatorMismatch {
                 op_span: op,
@@ -541,6 +578,19 @@ impl Value {
                 val: lhs < rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs < rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs < rhs,
+                    span,
+                })
+            }
+
             _ => Err(ShellError::OperatorMismatch {
                 op_span: op,
                 lhs_ty: self.get_type(),
@@ -570,6 +620,18 @@ impl Value {
                 val: lhs <= rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs <= rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs <= rhs,
+                    span,
+                })
+            }
             _ => Err(ShellError::OperatorMismatch {
                 op_span: op,
                 lhs_ty: self.get_type(),
@@ -599,6 +661,18 @@ impl Value {
                 val: lhs > rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs > rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs > rhs,
+                    span,
+                })
+            }
             _ => Err(ShellError::OperatorMismatch {
                 op_span: op,
                 lhs_ty: self.get_type(),
@@ -628,6 +702,18 @@ impl Value {
                 val: lhs >= rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs >= rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs >= rhs,
+                    span,
+                })
+            }
             _ => Err(ShellError::OperatorMismatch {
                 op_span: op,
                 lhs_ty: self.get_type(),
@@ -664,6 +750,18 @@ impl Value {
                 val: lhs == rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs == rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs == rhs,
+                    span,
+                })
+            }
             (Value::List { vals: lhs, .. }, Value::List { vals: rhs, .. }) => Ok(Value::Bool {
                 val: lhs == rhs,
                 span,
@@ -719,6 +817,18 @@ impl Value {
                 val: lhs != rhs,
                 span,
             }),
+            (Value::Duration { val: lhs, .. }, Value::Duration { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs != rhs,
+                    span,
+                })
+            }
+            (Value::Filesize { val: lhs, .. }, Value::Filesize { val: rhs, .. }) => {
+                Ok(Value::Bool {
+                    val: lhs != rhs,
+                    span,
+                })
+            }
             (Value::List { vals: lhs, .. }, Value::List { vals: rhs, .. }) => Ok(Value::Bool {
                 val: lhs != rhs,
                 span,
@@ -749,3 +859,69 @@ impl Value {
         }
     }
 }
+
+/// Format a duration in nanoseconds into a string
+pub fn format_duration(duration: i64) -> String {
+    let (sign, duration) = if duration >= 0 {
+        (1, duration)
+    } else {
+        (-1, -duration)
+    };
+    let (micros, nanos): (i64, i64) = (duration / 1000, duration % 1000);
+    let (millis, micros): (i64, i64) = (micros / 1000, micros % 1000);
+    let (secs, millis): (i64, i64) = (millis / 1000, millis % 1000);
+    let (mins, secs): (i64, i64) = (secs / 60, secs % 60);
+    let (hours, mins): (i64, i64) = (mins / 60, mins % 60);
+    let (days, hours): (i64, i64) = (hours / 24, hours % 24);
+
+    let mut output_prep = vec![];
+
+    if days != 0 {
+        output_prep.push(format!("{}day", days));
+    }
+
+    if hours != 0 {
+        output_prep.push(format!("{}hr", hours));
+    }
+
+    if mins != 0 {
+        output_prep.push(format!("{}min", mins));
+    }
+    // output 0sec for zero duration
+    if duration == 0 || secs != 0 {
+        output_prep.push(format!("{}sec", secs));
+    }
+
+    if millis != 0 {
+        output_prep.push(format!("{}ms", millis));
+    }
+
+    if micros != 0 {
+        output_prep.push(format!("{}us", micros));
+    }
+
+    if nanos != 0 {
+        output_prep.push(format!("{}ns", nanos));
+    }
+
+    format!(
+        "{}{}",
+        if sign == -1 { "-" } else { "" },
+        output_prep.join(" ")
+    )
+}
+
+fn format_filesize(num_bytes: i64) -> String {
+    let byte = byte_unit::Byte::from_bytes(num_bytes as u128);
+
+    if byte.get_bytes() == 0u128 {
+        return "—".to_string();
+    }
+
+    let byte = byte.get_appropriate_unit(false);
+
+    match byte.get_unit() {
+        byte_unit::ByteUnit::B => format!("{} B ", byte.get_value()),
+        _ => byte.format(1),
+    }
+}

crates/nu-protocol/src/value/unit.rs

@@ -0,0 +1,27 @@
+#[derive(Debug, Clone, Copy)]
+pub enum Unit {
+    // Filesize units: metric
+    Byte,
+    Kilobyte,
+    Megabyte,
+    Gigabyte,
+    Terabyte,
+    Petabyte,
+
+    // Filesize units: ISO/IEC 80000
+    Kibibyte,
+    Mebibyte,
+    Gibibyte,
+    Tebibyte,
+    Pebibyte,
+
+    // Duration units
+    Nanosecond,
+    Microsecond,
+    Millisecond,
+    Second,
+    Minute,
+    Hour,
+    Day,
+    Week,
+}

src/main.rs

@@ -66,7 +66,7 @@ fn main() -> Result<()> {
 
         Ok(())
     } else {
-        use reedline::{DefaultCompletionActionHandler, FileBackedHistory, Reedline, Signal};
+        use reedline::{FileBackedHistory, ListCompletionHandler, Reedline, Signal};
 
         let completer = NuCompleter::new(engine_state.clone());
         let mut entry_num = 0;
@@ -81,7 +81,7 @@ fn main() -> Result<()> {
                 engine_state: engine_state.clone(),
             }))
             .with_completion_action_handler(Box::new(
-                DefaultCompletionActionHandler::default().with_completer(Box::new(completer)),
+                ListCompletionHandler::default().with_completer(Box::new(completer)),
             ))
             .with_validator(Box::new(NuValidator {
                 engine_state: engine_state.clone(),

src/tests.rs

@@ -441,6 +441,46 @@ fn hide_twice_not_allowed() -> TestResult {
     )
 }
 
+#[test]
+fn hides_import_1() -> TestResult {
+    fail_test(
+        r#"module spam { export def foo [] { "foo" } }; use spam; hide spam.foo; foo"#,
+        "not found",
+    )
+}
+
+#[test]
+fn hides_import_2() -> TestResult {
+    fail_test(
+        r#"module spam { export def foo [] { "foo" } }; use spam; hide spam.*; foo"#,
+        "not found",
+    )
+}
+
+#[test]
+fn hides_import_3() -> TestResult {
+    fail_test(
+        r#"module spam { export def foo [] { "foo" } }; use spam; hide spam.[foo]; foo"#,
+        "not found",
+    )
+}
+
+#[test]
+fn hides_import_4() -> TestResult {
+    fail_test(
+        r#"module spam { export def foo [] { "foo" } }; use spam.foo; hide foo; foo"#,
+        "not found",
+    )
+}
+
+#[test]
+fn hides_import_5() -> TestResult {
+    fail_test(
+        r#"module spam { export def foo [] { "foo" } }; use spam.*; hide foo; foo"#,
+        "not found",
+    )
+}
+
 #[test]
 fn def_twice_should_fail() -> TestResult {
     fail_test(
@@ -449,6 +489,15 @@ fn def_twice_should_fail() -> TestResult {
     )
 }
 
+// TODO: This test fails if executed each command on a separate line in REPL
+#[test]
+fn use_import_after_hide() -> TestResult {
+    run_test(
+        r#"module spam { export def foo [] { "foo" } }; use spam.foo; hide foo; use spam.foo; foo"#,
+        "foo",
+    )
+}
+
 #[test]
 fn from_json_1() -> TestResult {
     run_test(r#"('{"name": "Fred"}' | from json).name"#, "Fred")