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A fill command to replace str lpad and str rpad (#7846)

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# Description

The point of this command is to allow you to be able to format ints,
floats, filesizes, and strings with an alignment, padding, and a fill
character, as strings. It's meant to take the place of `str lpad` and
`str rpad`.

```
> help fill
Fill and Align

Search terms: display, render, format, pad, align

Usage:
  > fill {flags}

Flags:
  -h, --help - Display the help message for this command
  -w, --width <Int> - The width of the output. Defaults to 1
  -a, --alignment <String> - The alignment of the output. Defaults to Left (Left(l), Right(r), Center(c/m), MiddleRight(cr/mr))
  -c, --character <String> - The character to fill with. Defaults to ' ' (space)

Signatures:
  <number> | fill -> <string>
  <string> | fill -> <string>

Examples:
  Fill a string on the left side to a width of 15 with the character '─'
  > 'nushell' | fill -a l -c '─' -w 15

  Fill a string on the right side to a width of 15 with the character '─'
  > 'nushell' | fill -a r -c '─' -w 15

  Fill a string on both sides to a width of 15 with the character '─'
  > 'nushell' | fill -a m -c '─' -w 15

  Fill a number on the left side to a width of 5 with the character '0'
  > 1 | fill --alignment right --character 0 --width 5

  Fill a filesize on the left side to a width of 5 with the character '0'
  > 1kib | fill --alignment middle --character 0 --width 10
```

![image](https://user-images.githubusercontent.com/343840/214133752-6fc93fa7-4003-4eb4-96ed-cd967312e244.png)

# User-Facing Changes

Deprecated `str lpad` and `str rpad`.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
This commit is contained in:
Darren Schroeder 2023-02-09 14:56:52 -06:00 committed by GitHub
parent c31225fdcf
commit 00601f1835
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13 changed files with 358 additions and 335 deletions
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11
Cargo.lock generated
View File

@ -2804,10 +2804,11 @@ dependencies = [
"terminal_size 0.2.1",
"thiserror",
"titlecase",
"toml 0.7.1",
"toml 0.7.2",
"trash",
"umask",
"unicode-segmentation",
"unicode-width",
"url",
"users 0.11.0",
"uuid",
@ -5288,9 +5289,9 @@ dependencies = [
[[package]]
name = "toml"
version = "0.7.1"
version = "0.7.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "772c1426ab886e7362aedf4abc9c0d1348a979517efedfc25862944d10137af0"
checksum = "f7afcae9e3f0fe2c370fd4657108972cbb2fa9db1b9f84849cefd80741b01cb6"
dependencies = [
"serde",
"serde_spanned",
@ -5309,9 +5310,9 @@ dependencies = [
[[package]]
name = "toml_edit"
version = "0.19.1"
version = "0.19.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "90a238ee2e6ede22fb95350acc78e21dc40da00bb66c0334bde83de4ed89424e"
checksum = "5e6a7712b49e1775fb9a7b998de6635b299237f48b404dde71704f2e0e7f37e5"
dependencies = [
"indexmap",
"nom8",

3
crates/nu-command/Cargo.toml
View File

@ -86,8 +86,8 @@ sysinfo = "0.27.7"
terminal_size = "0.2.1"
thiserror = "1.0.31"
titlecase = "2.0.0"
unicode-segmentation = "1.10.0"
toml = "0.7.1"
unicode-segmentation = "1.8.0"
url = "2.2.1"
percent-encoding = "2.2.0"
uuid = { version = "1.2.2", features = ["v4"] }
@ -96,6 +96,7 @@ reedline = { version = "0.15.0", features = ["bashisms", "sqlite"] }
wax = { version = "0.5.0" }
rusqlite = { version = "0.28.0", features = ["bundled"], optional = true }
sqlparser = { version = "0.30.0", features = ["serde"], optional = true }
unicode-width = "0.1.10"
[target.'cfg(windows)'.dependencies]
winreg = "0.10.1"

268
crates/nu-command/src/conversions/fill.rs Normal file
View File

@ -0,0 +1,268 @@
use crate::input_handler::{operate, CmdArgument};
use nu_engine::CallExt;
use nu_protocol::{
ast::{Call, CellPath},
engine::{Command, EngineState, Stack},
Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
};
use unicode_width::UnicodeWidthStr;
#[derive(Clone)]
pub struct Fill;
struct Arguments {
width: usize,
alignment: FillAlignment,
character: String,
cell_paths: Option<Vec<CellPath>>,
}
impl CmdArgument for Arguments {
fn take_cell_paths(&mut self) -> Option<Vec<CellPath>> {
self.cell_paths.take()
}
}
#[derive(Clone, Copy)]
enum FillAlignment {
Left,
Right,
Middle,
MiddleRight,
}
impl Command for Fill {
fn name(&self) -> &str {
"fill"
}
fn usage(&self) -> &str {
"Fill and Align"
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("fill")
.input_output_types(vec![
(Type::Int, Type::String),
(Type::Float, Type::String),
(Type::String, Type::String),
(Type::Filesize, Type::String),
])
.vectorizes_over_list(true)
.named(
"width",
SyntaxShape::Int,
"The width of the output. Defaults to 1",
Some('w'),
)
.named(
"alignment",
SyntaxShape::String,
"The alignment of the output. Defaults to Left (Left(l), Right(r), Center(c/m), MiddleRight(cr/mr))",
Some('a'),
)
.named(
"character",
SyntaxShape::String,
"The character to fill with. Defaults to ' ' (space)",
Some('c'),
)
.category(Category::Conversions)
}
fn search_terms(&self) -> Vec<&str> {
vec!["display", "render", "format", "pad", "align"]
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description:
"Fill a string on the left side to a width of 15 with the character '─'",
example: "'nushell' | fill -a l -c '─' -w 15",
result: Some(Value::String {
val: "nushell────────".into(),
span: Span::test_data(),
}),
},
Example {
description:
"Fill a string on the right side to a width of 15 with the character '─'",
example: "'nushell' | fill -a r -c '─' -w 15",
result: Some(Value::String {
val: "────────nushell".into(),
span: Span::test_data(),
}),
},
Example {
description: "Fill a string on both sides to a width of 15 with the character '─'",
example: "'nushell' | fill -a m -c '─' -w 15",
result: Some(Value::String {
val: "────nushell────".into(),
span: Span::test_data(),
}),
},
Example {
description:
"Fill a number on the left side to a width of 5 with the character '0'",
example: "1 | fill --alignment right --character 0 --width 5",
result: Some(Value::String {
val: "00001".into(),
span: Span::test_data(),
}),
},
Example {
description: "Fill a number on both sides to a width of 5 with the character '0'",
example: "1.1 | fill --alignment center --character 0 --width 5",
result: Some(Value::String {
val: "01.10".into(),
span: Span::test_data(),
}),
},
Example {
description:
"Fill a filesize on the left side to a width of 5 with the character '0'",
example: "1kib | fill --alignment middle --character 0 --width 10",
result: Some(Value::String {
val: "0001024000".into(),
span: Span::test_data(),
}),
},
]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
fill(engine_state, stack, call, input)
}
}
fn fill(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let width_arg: Option<usize> = call.get_flag(engine_state, stack, "width")?;
let alignment_arg: Option<String> = call.get_flag(engine_state, stack, "alignment")?;
let character_arg: Option<String> = call.get_flag(engine_state, stack, "character")?;
let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
let cell_paths = (!cell_paths.is_empty()).then_some(cell_paths);
let alignment = if let Some(arg) = alignment_arg {
match arg.to_lowercase().as_str() {
"l" | "left" => FillAlignment::Left,
"r" | "right" => FillAlignment::Right,
"c" | "center" | "m" | "middle" => FillAlignment::Middle,
"cr" | "centerright" | "mr" | "middleright" => FillAlignment::MiddleRight,
_ => FillAlignment::Left,
}
} else {
FillAlignment::Left
};
let width = if let Some(arg) = width_arg { arg } else { 1 };
let character = if let Some(arg) = character_arg {
arg
} else {
" ".to_string()
};
let arg = Arguments {
width,
alignment,
character,
cell_paths,
};
operate(action, arg, input, call.head, engine_state.ctrlc.clone())
}
fn action(input: &Value, args: &Arguments, span: Span) -> Value {
match input {
Value::Int { val, .. } => fill_int(*val, args, span),
Value::Filesize { val, .. } => fill_int(*val, args, span),
Value::Float { val, .. } => fill_float(*val, args, span),
Value::String { val, .. } => fill_string(val, args, span),
// Propagate errors by explicitly matching them before the final case.
Value::Error { .. } => input.clone(),
other => Value::Error {
error: ShellError::OnlySupportsThisInputType(
"int, filesize, float, string".into(),
other.get_type().to_string(),
span,
// This line requires the Value::Error match above.
other.expect_span(),
),
},
}
}
fn fill_float(num: f64, args: &Arguments, span: Span) -> Value {
let s = num.to_string();
let out_str = pad(&s, args.width, &args.character, args.alignment, false);
Value::String { val: out_str, span }
}
fn fill_int(num: i64, args: &Arguments, span: Span) -> Value {
let s = num.to_string();
let out_str = pad(&s, args.width, &args.character, args.alignment, false);
Value::String { val: out_str, span }
}
fn fill_string(s: &str, args: &Arguments, span: Span) -> Value {
let out_str = pad(s, args.width, &args.character, args.alignment, false);
Value::String { val: out_str, span }
}
fn pad(s: &str, width: usize, pad_char: &str, alignment: FillAlignment, truncate: bool) -> String {
// Attribution: Most of this function was taken from https://github.com/ogham/rust-pad and tweaked. Thank you!
// Use width instead of len for graphical display
let cols = UnicodeWidthStr::width(s);
if cols >= width {
if truncate {
return s[..width].to_string();
} else {
return s.to_string();
}
}
let diff = width - cols;
let (left_pad, right_pad) = match alignment {
FillAlignment::Left => (0, diff),
FillAlignment::Right => (diff, 0),
FillAlignment::Middle => (diff / 2, diff - diff / 2),
FillAlignment::MiddleRight => (diff - diff / 2, diff / 2),
};
let mut new_str = String::new();
for _ in 0..left_pad {
new_str.push_str(pad_char)
}
new_str.push_str(s);
for _ in 0..right_pad {
new_str.push_str(pad_char)
}
new_str
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(Fill {})
}
}

2
crates/nu-command/src/conversions/mod.rs
View File

@ -1,5 +1,7 @@
mod fill;
mod fmt;
pub(crate) mod into;
pub use fill::Fill;
pub use fmt::Fmt;
pub use into::*;

5
crates/nu-command/src/default_context.rs
View File

@ -227,10 +227,8 @@ pub fn create_default_context() -> EngineState {
StrIndexOf,
StrKebabCase,
StrLength,
StrLpad,
StrPascalCase,
StrReverse,
StrRpad,
StrScreamingSnakeCase,
StrSnakeCase,
StrStartsWith,
@ -370,6 +368,7 @@ pub fn create_default_context() -> EngineState {
// Conversions
bind_command! {
Fill,
Fmt,
Into,
IntoBool,
@ -484,6 +483,8 @@ pub fn create_default_context() -> EngineState {
// Deprecated
bind_command! {
HashBase64,
LPadDeprecated,
RPadDeprecated,
Source,
StrDatetimeDeprecated,
StrDecimalDeprecated,

2
crates/nu-command/src/deprecated/deprecated_commands.rs
View File

@ -20,5 +20,7 @@ pub fn deprecated_commands() -> HashMap<String, String> {
),
("fetch".to_string(), "http get".to_string()),
("post".to_string(), "http post".to_string()),
("str lpad".to_string(), "fill".to_string()),
("str rpad".to_string(), "fill".to_string()),
])
}

35
crates/nu-command/src/deprecated/lpad.rs Normal file
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@ -0,0 +1,35 @@
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::Category;
use nu_protocol::{PipelineData, ShellError, Signature};
#[derive(Clone)]
pub struct LPadDeprecated;
impl Command for LPadDeprecated {
fn name(&self) -> &str {
"str lpad"
}
fn signature(&self) -> Signature {
Signature::build(self.name()).category(Category::Deprecated)
}
fn usage(&self) -> &str {
"Deprecated command"
}
fn run(
&self,
_: &EngineState,
_: &mut Stack,
call: &Call,
_: PipelineData,
) -> Result<PipelineData, ShellError> {
Err(nu_protocol::ShellError::DeprecatedCommand(
self.name().to_string(),
"fill".to_owned(),
call.head,
))
}
}

4
crates/nu-command/src/deprecated/mod.rs
View File

@ -1,6 +1,8 @@
mod deprecated_commands;
mod hash_base64;
mod lpad;
mod math_eval;
mod rpad;
mod source;
mod str_datetime;
mod str_decimal;
@ -9,7 +11,9 @@ mod str_int;
pub use deprecated_commands::*;
pub use hash_base64::HashBase64;
pub use lpad::LPadDeprecated;
pub use math_eval::SubCommand as MathEvalDeprecated;
pub use rpad::RPadDeprecated;
pub use source::Source;
pub use str_datetime::StrDatetimeDeprecated;
pub use str_decimal::StrDecimalDeprecated;

35
crates/nu-command/src/deprecated/rpad.rs Normal file
View File

@ -0,0 +1,35 @@
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::Category;
use nu_protocol::{PipelineData, ShellError, Signature};
#[derive(Clone)]
pub struct RPadDeprecated;
impl Command for RPadDeprecated {
fn name(&self) -> &str {
"str rpad"
}
fn signature(&self) -> Signature {
Signature::build(self.name()).category(Category::Deprecated)
}
fn usage(&self) -> &str {
"Deprecated command"
}
fn run(
&self,
_: &EngineState,
_: &mut Stack,
call: &Call,
_: PipelineData,
) -> Result<PipelineData, ShellError> {
Err(nu_protocol::ShellError::DeprecatedCommand(
self.name().to_string(),
"fill".to_owned(),
call.head,
))
}
}

165
crates/nu-command/src/strings/str_/lpad.rs
View File

@ -1,165 +0,0 @@
use crate::input_handler::{operate, CmdArgument};
use nu_engine::CallExt;
use nu_protocol::ast::Call;
use nu_protocol::ast::CellPath;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::Category;
use nu_protocol::{Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value};
struct Arguments {
length: Option<i64>,
character: Option<String>,
cell_paths: Option<Vec<CellPath>>,
}
impl CmdArgument for Arguments {
fn take_cell_paths(&mut self) -> Option<Vec<CellPath>> {
self.cell_paths.take()
}
}
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"str lpad"
}
fn signature(&self) -> Signature {
Signature::build("str lpad")
.input_output_types(vec![(Type::String, Type::String)])
.vectorizes_over_list(true)
.required_named("length", SyntaxShape::Int, "length to pad to", Some('l'))
.required_named(
"character",
SyntaxShape::String,
"character to pad with",
Some('c'),
)
.rest(
"rest",
SyntaxShape::CellPath,
"For a data structure input, pad strings at the given cell paths",
)
.category(Category::Strings)
}
fn usage(&self) -> &str {
"Left-pad a string to a specific length"
}
fn search_terms(&self) -> Vec<&str> {
vec!["append", "truncate", "padding"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
let cell_paths = (!cell_paths.is_empty()).then_some(cell_paths);
let args = Arguments {
length: call.get_flag(engine_state, stack, "length")?,
character: call.get_flag(engine_state, stack, "character")?,
cell_paths,
};
if args.length.expect("this exists") < 0 {
return Err(ShellError::TypeMismatch(
String::from("The length of the string cannot be negative"),
call.head,
));
}
operate(action, args, input, call.head, engine_state.ctrlc.clone())
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Left-pad a string with asterisks until it's 10 characters wide",
example: "'nushell' | str lpad -l 10 -c '*'",
result: Some(Value::test_string("***nushell")),
},
Example {
description: "Left-pad a string with zeroes until it's 10 character wide",
example: "'123' | str lpad -l 10 -c '0'",
result: Some(Value::test_string("0000000123")),
},
Example {
description: "Use lpad to truncate a string to its last three characters",
example: "'123456789' | str lpad -l 3 -c '0'",
result: Some(Value::test_string("789")),
},
Example {
description: "Use lpad to pad Unicode",
example: "'▉' | str lpad -l 10 -c '▉'",
result: Some(Value::test_string("▉▉▉▉▉▉▉▉▉▉")),
},
]
}
}
fn action(
input: &Value,
Arguments {
character, length, ..
}: &Arguments,
head: Span,
) -> Value {
match &input {
Value::String { val, .. } => match length {
Some(x) => {
let s = *x as usize;
if s < val.len() {
Value::String {
val: val
.chars()
.rev()
.take(s)
.collect::<String>()
.chars()
.rev()
.collect::<String>(),
span: head,
}
} else {
let c = character.as_ref().expect("we already know this flag needs to exist because the command is type checked before we call the action function");
let mut res = c.repeat(s - val.chars().count());
res += val;
Value::String {
val: res,
span: head,
}
}
}
None => Value::Error {
error: ShellError::TypeMismatch(String::from("Length argument is missing"), head),
},
},
Value::Error { .. } => input.clone(),
_ => Value::Error {
error: ShellError::OnlySupportsThisInputType(
"string".into(),
input.get_type().to_string(),
head,
input.expect_span(),
),
},
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(SubCommand {})
}
}

4
crates/nu-command/src/strings/str_/mod.rs
View File

@ -6,10 +6,8 @@ mod ends_with;
mod index_of;
mod join;
mod length;
mod lpad;
mod replace;
mod reverse;
mod rpad;
mod starts_with;
mod substring;
mod trim;
@ -22,10 +20,8 @@ pub use ends_with::SubCommand as StrEndswith;
pub use index_of::SubCommand as StrIndexOf;
pub use join::*;
pub use length::SubCommand as StrLength;
pub use lpad::SubCommand as StrLpad;
pub use replace::SubCommand as StrReplace;
pub use reverse::SubCommand as StrReverse;
pub use rpad::SubCommand as StrRpad;
pub use starts_with::SubCommand as StrStartsWith;
pub use substring::SubCommand as StrSubstring;
pub use trim::Trim as StrTrim;

157
crates/nu-command/src/strings/str_/rpad.rs
View File

@ -1,157 +0,0 @@
use crate::input_handler::{operate, CmdArgument};
use nu_engine::CallExt;
use nu_protocol::ast::Call;
use nu_protocol::ast::CellPath;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::Category;
use nu_protocol::{Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value};
struct Arguments {
length: Option<i64>,
character: Option<String>,
cell_paths: Option<Vec<CellPath>>,
}
impl CmdArgument for Arguments {
fn take_cell_paths(&mut self) -> Option<Vec<CellPath>> {
self.cell_paths.take()
}
}
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"str rpad"
}
fn signature(&self) -> Signature {
Signature::build("str rpad")
.input_output_types(vec![(Type::String, Type::String)])
.vectorizes_over_list(true)
.required_named("length", SyntaxShape::Int, "length to pad to", Some('l'))
.required_named(
"character",
SyntaxShape::String,
"character to pad with",
Some('c'),
)
.rest(
"rest",
SyntaxShape::CellPath,
"For a data structure input, pad strings at the given cell paths",
)
.category(Category::Strings)
}
fn usage(&self) -> &str {
"Right-pad a string to a specific length"
}
fn search_terms(&self) -> Vec<&str> {
vec!["append", "truncate", "padding"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
let cell_paths = (!cell_paths.is_empty()).then_some(cell_paths);
let args = Arguments {
length: call.get_flag(engine_state, stack, "length")?,
character: call.get_flag(engine_state, stack, "character")?,
cell_paths,
};
if args.length.expect("this exists") < 0 {
return Err(ShellError::TypeMismatch(
String::from("The length of the string cannot be negative"),
call.head,
));
}
operate(action, args, input, call.head, engine_state.ctrlc.clone())
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Right-pad a string with asterisks until it's 10 characters wide",
example: "'nushell' | str rpad -l 10 -c '*'",
result: Some(Value::test_string("nushell***")),
},
Example {
description: "Right-pad a string with zeroes until it's 10 characters wide",
example: "'123' | str rpad -l 10 -c '0'",
result: Some(Value::test_string("1230000000")),
},
Example {
description: "Use rpad to truncate a string to its first three characters",
example: "'123456789' | str rpad -l 3 -c '0'",
result: Some(Value::test_string("123")),
},
Example {
description: "Use rpad to pad Unicode",
example: "'▉' | str rpad -l 10 -c '▉'",
result: Some(Value::test_string("▉▉▉▉▉▉▉▉▉▉")),
},
]
}
}
fn action(
input: &Value,
Arguments {
character, length, ..
}: &Arguments,
head: Span,
) -> Value {
match &input {
Value::String { val, .. } => match length {
Some(x) => {
let s = *x as usize;
if s < val.len() {
Value::String {
val: val.chars().take(s).collect::<String>(),
span: head,
}
} else {
let mut res = val.to_string();
res += &character.as_ref().expect("we already know this flag needs to exist because the command is type checked before we call the action function").repeat(s - val.chars().count());
Value::String {
val: res,
span: head,
}
}
}
None => Value::Error {
error: ShellError::TypeMismatch(String::from("Length argument is missing"), head),
},
},
Value::Error { .. } => input.clone(),
_ => Value::Error {
error: ShellError::OnlySupportsThisInputType(
"string".into(),
input.get_type().to_string(),
head,
input.expect_span(),
),
},
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(SubCommand {})
}
}

2
src/tests/test_parser.rs
View File

@ -224,7 +224,7 @@ fn commands_have_usage() -> TestResult {
#[test]
fn equals_separates_long_flag() -> TestResult {
run_test(
r#"'nushell' | str lpad --length=10 --character='-'"#,
r#"'nushell' | fill --alignment right --width=10 --character='-'"#,
"---nushell",
)
}