# Description
This PR allows the `into string` command to pass the `--group-digits`
flag which already existed in this code but was hard coded to `false`.
Now you can do things like
```nushell
❯ 1234567890 | into string --group-digits
1,234,567,890
❯ ls | into string size --group-digits | last 5
╭─#─┬────────name─────────┬─type─┬──size──┬───modified───╮
│ 0 │ README.md │ file │ 12,606 │ 4 weeks ago │
│ 1 │ rust-toolchain.toml │ file │ 1,125 │ 2 weeks ago │
│ 2 │ SECURITY.md │ file │ 2,712 │ 7 months ago │
│ 3 │ toolkit.nu │ file │ 21,929 │ 2 months ago │
│ 4 │ typos.toml │ file │ 542 │ 7 months ago │
╰─#─┴────────name─────────┴─type─┴──size──┴───modified───╯
❯ "12345" | into string --group-digits
12,345
```
# User-Facing Changes
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# Tests + Formatting
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Fixes#15028
# Description
The current implementation of `into duration` uses bare pointer
arithmetic instead of wrapping one. This works fine on 64-bit platforms,
since the pointers don't take up all of the 64 bits, but fails on 32 bit
ones.
# Tests + Formatting
All of the affected tests pass on my end, but it's `x86_84`, so they
were also passing before that.
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# Description
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This PR makes two changes related to [run-time pipeline input type
checking](https://github.com/nushell/nushell/pull/14741):
1. The check which bypasses type checking for commands with only
`Type::Nothing` input types has been expanded to work with commands with
multiple `Type::Nothing` inputs for different outputs. For example,
`ast` has three input/output type pairs, but all of the inputs are
`Type::Nothing`:
```
╭───┬─────────┬────────╮
│ # │ input │ output │
├───┼─────────┼────────┤
│ 0 │ nothing │ table │
│ 1 │ nothing │ record │
│ 2 │ nothing │ string │
╰───┴─────────┴────────╯
```
Before this PR, passing a value (which would otherwise be ignored) to
`ast` caused a run-time type error:
```
Error: nu:🐚:only_supports_this_input_type
× Input type not supported.
╭─[entry #1:1:6]
1 │ echo 123 | ast -j -f "hi"
· ─┬─ ─┬─
· │ ╰── only nothing, nothing, and nothing input data is supported
· ╰── input type: int
╰────
```
After this PR, no error is raised.
This doesn't really matter for `ast` (the only other built-in command
with a similar input/output type signature is `cal`), but it's more
logically consistent.
2. Bypasses input type-checking (parse-time ***and*** run-time) for some
(not all, see below) commands which have both a `Type::Nothing` input
and some other non-nothing `Type` input. This is accomplished by adding
a `Type::Any` input with the same output as the corresponding
`Type::Nothing` input/output pair.
This is necessary because some commands are intended to operate on an
argument with empty pipeline input, or operate on an empty pipeline
input with no argument. This causes issues when a value is implicitly
passed to one of these commands. I [discovered this
issue](https://discord.com/channels/601130461678272522/615962413203718156/1329945784346611712)
when working with an example where the `open` command is used in
`sort-by` closure:
```nushell
ls | sort-by { open -r $in.name | lines | length }
```
Before this PR (but after the run-time input type checking PR), this
error is raised:
```
Error: nu:🐚:only_supports_this_input_type
× Input type not supported.
╭─[entry #1:1:1]
1 │ ls | sort-by { open -r $in.name | lines | length }
· ─┬ ──┬─
· │ ╰── only nothing and string input data is supported
· ╰── input type: record<name: string, type: string, size: filesize, modified: date>
╰────
```
While this error is technically correct, we don't actually want to
return an error here since `open` ignores its pipeline input when an
argument is passed. This would be a parse-time error as well if the
parser was able to infer that the closure input type was a record, but
our type inference isn't that robust currently, so this technically
incorrect form snuck by type checking until #14741.
However, there are some commands with the same kind of type signature
where this behavior is actually desirable. This means we can't just
bypass type-checking for any command with a `Type::Nothing` input. These
commands operate on true `null` values, rather than ignoring their
input. For example, `length` returns `0` when passed a `null` value.
It's correct, and even desirable, to throw a run-time error when
`length` is passed an unexpected type. For example, a string, which
should instead be measured with `str length`:
```nushell
["hello" "world"] | sort-by { length }
# => Error: nu:🐚:only_supports_this_input_type
# =>
# => × Input type not supported.
# => ╭─[entry #32:1:10]
# => 1 │ ["hello" "world"] | sort-by { length }
# => · ───┬─── ───┬──
# => · │ ╰── only list<any>, binary, and nothing input data is supported
# => · ╰── input type: string
# => ╰────
```
We need a more robust way for commands to express how they handle the
`Type::Nothing` input case. I think a possible solution here is to allow
commands to express that they operate on `PipelineData::Empty`, rather
than `Value::Nothing`. Then, a command like `open` could have an empty
pipeline input type rather than a `Type::Nothing`, and the parse-time
and run-time pipeline input type checks know that `open` will safely
ignore an incorrectly typed input.
That being said, we have a release coming up and the above solution
might take a while to implement, so while unfortunate, bypassing input
type-checking for these problematic commands serves as a workaround to
avoid breaking changes in the release until a more robust solution is
implemented.
This PR bypasses input type-checking for the following commands:
* `load-env`: can take record of envvars as input or argument
* `nu-check`: checks input string or filename argument
* `open`: can take filename as input or argument
* `polars when`: can be used with input, or can be chained with another
`polars when`
* `stor insert`: data record can be passed as input or argument
* `stor update`: data record can be passed as input or argument
* `format date`: `--list` ignores input value
* `into datetime`: `--list` ignores input value (also added a
`Type::Nothing` input which was missing from this command)
These commands have a similar input/output signature to the above
commands, but are working as intended:
* `cd`: The input/output signature was actually incorrect, `cd` always
ignores its input. I fixed this in this PR.
* `generate`
* `get`
* `history import`
* `interleave`
* `into bool`
* `length`
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
As a temporary workaround, pipeline input type-checking for the
following commands has been bypassed to avoid undesirable run-time input
type checking errors which were previously not caught at parse-time:
* `open`
* `load-env`
* `format date`
* `into datetime`
* `nu-check`
* `stor insert`
* `stor update`
* `polars when`
# Tests + Formatting
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CI became green in the time it took me to type the description 😄
# After Submitting
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N/A
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# Description
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As mentioned in #10698, we have too many `ShellError` variants, with
some even overlapping in meaning. This PR simplifies and improves I/O
error handling by restructuring `ShellError` related to I/O issues.
Previously, `ShellError::IOError` only contained a message string,
making it convenient but overly generic. It was widely used without
providing spans (#4323).
This PR introduces a new `ShellError::Io` variant that consolidates
multiple I/O-related errors (except for `ShellError::NetworkFailure`,
which remains distinct for now). The new `ShellError::Io` variant
replaces the following:
- `FileNotFound`
- `FileNotFoundCustom`
- `IOInterrupted`
- `IOError`
- `IOErrorSpanned`
- `NotADirectory`
- `DirectoryNotFound`
- `MoveNotPossible`
- `CreateNotPossible`
- `ChangeAccessTimeNotPossible`
- `ChangeModifiedTimeNotPossible`
- `RemoveNotPossible`
- `ReadingFile`
## The `IoError`
`IoError` includes the following fields:
1. **`kind`**: Extends `std::io::ErrorKind` to specify the type of I/O
error without needing new `ShellError` variants. This aligns with the
approach used in `std::io::Error`. This adds a second dimension to error
reporting by combining the `kind` field with `ShellError` variants,
making it easier to describe errors in more detail. As proposed by
@kubouch in [#design-discussion on
Discord](https://discord.com/channels/601130461678272522/615329862395101194/1323699197165178930),
this helps reduce the number of `ShellError` variants. In the error
report, the `kind` field is displayed as the "source" of the error,
e.g., "I/O error," followed by the specific kind of I/O error.
2. **`span`**: A non-optional field to encourage providing spans for
better error reporting (#4323).
3. **`path`**: Optional `PathBuf` to give context about the file or
directory involved in the error (#7695). If provided, it’s shown as a
help entry in error reports.
4. **`additional_context`**: Allows adding custom messages when the
span, kind, and path are insufficient. This is rendered in the error
report at the labeled span.
5. **`location`**: Sometimes, I/O errors occur in the engine itself and
are not caused directly by user input. In such cases, if we don’t have a
span and must set it to `Span::unknown()`, we need another way to
reference the error. For this, the `location` field uses the new
`Location` struct, which records the Rust file and line number where the
error occurred. This ensures that we at least know the Rust code
location that failed, helping with debugging. To make this work, a new
`location!` macro was added, which retrieves `file!`, `line!`, and
`column!` values accurately. If `Location::new` is used directly, it
issues a warning to remind developers to use the macro instead, ensuring
consistent and correct usage.
### Constructor Behavior
`IoError` provides five constructor methods:
- `new` and `new_with_additional_context`: Used for errors caused by
user input and require a valid (non-unknown) span to ensure precise
error reporting.
- `new_internal` and `new_internal_with_path`: Used for internal errors
where a span is not available. These methods require additional context
and the `Location` struct to pinpoint the source of the error in the
engine code.
- `factory`: Returns a closure that maps an `std::io::Error` to an
`IoError`. This is useful for handling multiple I/O errors that share
the same span and path, streamlining error handling in such cases.
## New Report Look
This is simulation how the I/O errors look like (the `open crates` is
simulated to show how internal errors are referenced now):
## `Span::test_data()`
To enable better testing, `Span::test_data()` now returns a value
distinct from `Span::unknown()`. Both `Span::test_data()` and
`Span::unknown()` refer to invalid source code, but having a separate
value for test data helps identify issues during testing while keeping
spans unique.
## Cursed Sneaky Error Transfers
I removed the conversions between `std::io::Error` and `ShellError` as
they often removed important information and were used too broadly to
handle I/O errors. This also removed the problematic implementation
found here:
7ea4895513/crates/nu-protocol/src/errors/shell_error.rs (L1534-L1583)
which hid some downcasting from I/O errors and made it hard to trace
where `ShellError` was converted into `std::io::Error`. To address this,
I introduced a new struct called `ShellErrorBridge`, which explicitly
defines this transfer behavior. With `ShellErrorBridge`, we can now
easily grep the codebase to locate and manage such conversions.
## Miscellaneous
- Removed the OS error added in #14640, as it’s no longer needed.
- Improved error messages in `glob_from` (#14679).
- Trying to open a directory with `open` caused a permissions denied
error (it's just what the OS provides). I added a `is_dir` check to
provide a better error in that case.
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
- Error outputs now include more detailed information and are formatted
differently, including updated error codes.
- The structure of `ShellError` has changed, requiring plugin authors
and embedders to update their implementations.
# Tests + Formatting
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I updated tests to account for the new I/O error structure and
formatting changes.
# After Submitting
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This PR closes#7695 and closes#14892 and partially addresses #4323 and
#10698.
---------
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
# Description
This PR cleans up the code surrounding formatting and displaying file
sizes.
- The `byte_unit` crate we use for file size units displays kilobytes as
`KB`, which is not the SI or ISO/IEC standard. Rather it should be `kB`,
so this fixes#8872. On some systems, `KB` actually means `KiB`, so this
avoids any potential confusion.
- The `byte_unit` crate, when displaying file sizes, casts integers to
floats which will lose precision for large file sizes. This PR adds a
custom `Display` implementation for `Filesize` that can give an exact
string representation of a `Filesize` for metric/SI units.
- This PR also removes the dependency on the `byte_unit` crate which
brought in several other dependencies.
Additionally, this PR makes some changes to the config for filesize
formatting (`$env.config.filesize`).
- The previous filesize config had the `metric` and `format` options. If
a metric (SI) unit was set in `format`, but `metric` was set to false,
then the `metric` option would take precedence and convert `format` to
the corresponding binary unit (or vice versa). E.g., `{ format: kB,
metric: false }` => `KiB`. Instead, this PR adds the `unit` option to
replace the `format` and `metric` options. `unit` can be set to a fixed
file size unit like `kB` or `KiB`, or it can be set to one of the
special options: `binary` or `metric`. These options tells nushell to
format file sizes using an appropriately scaled metric or binary unit
(examples below).
```nushell
# precision = null
# unit = kB
1kB # 1 kB
1KiB # 1.024 kB
# unit = KiB
1kB # 0.9765625 KiB
1KiB # 1 KiB
# unit = metric
1000B # 1 kB
1024B # 1.024 kB
10_000MB # 10 GB
10_240MiB # 10.73741824 GB
# unit = binary
1000B # 1000 B
1024B # 1 KiB
10_000MB # 9.313225746154785 GiB
10_240MiB # 10 GiB
```
- In addition, this PR also adds the `precision` option to the filesize
config. It determines how many digits to show after the decimal point.
If set to null, then everything after the decimal point is shown.
- The default filesize config is `{ unit: metric, precision: 1 }`.
# User-Facing Changes
- Commands that use the config to format file sizes will follow the
changes described above (e.g., `table`, `into string`, `to text`, etc.).
- The file size unit/format passed to `format filesize` is now case
sensitive. An error with the valid units is shown if the case does not
match.
- `$env.config.filesize.format` and `$env.config.filesize.metric` are
deprecated and replaced by `$env.config.filesize.unit`.
- A new `$env.config.filesize.precision` option was added.
# Tests + Formatting
Mostly updated test expected outputs.
# After Submitting
This PR does not change the way NUON serializes file sizes, because that
would require changing the nu parser to be able to losslessly decode the
new, exact string representation introduced in this PR.
Similarly, this PR also does not change the file size parsing in any
way. Although the file size units provided to `format filesize` or the
filesize config are now case-sensitive, the same is not yet true for
file size literals in nushell code.
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# Description
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https://github.com/nushell/nushell/pull/14845#issuecomment-2596371878
When the input to `into cell-path` is a cell-path, it will return it
like other into commands.
# User-Facing Changes
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Before, using `into cell-path` with a cell-path as input would return an
error, now it will return the input.
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# Description
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https://github.com/nushell/nushell/pull/14845#issuecomment-2596371878
When the input to `into glob` is a glob, it will return it like other
into commands.
# User-Facing Changes
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Before, using `into glob` with a glob as input would return an error,
now it will return the input.
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# Description
- Closes#14839
When the input to `into datetime` is a datetime, it will return it like
other `into` commands.
# User-Facing Changes
Before, using `into datetime` with a datetime as input would return an
error, now it will return the input.
# Tests + Formatting
Added test `takes_datetime`.
# After Submitting
Doc file is automatically generated.
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# Description
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This PR adds type checking of all command input types at run-time.
Generally, these errors should be caught by the parser, but sometimes we
can't know the type of a value at parse-time. The simplest example is
using the `echo` command, which has an output type of `any`, so
prefixing a literal with `echo` will bypass parse-time type checking.
Before this PR, each command has to individually check its input types.
This can result in scenarios where the input/output types don't match
the actual command behavior. This can cause valid usage with an
non-`any` type to become a parse-time error if a command is missing that
type in its pipeline input/output (`drop nth` and `history import` do
this before this PR). Alternatively, a command may not list a type in
its input/output types, but doesn't actually reject that type in its
code, which can have unintended side effects (`get` does this on an
empty pipeline input, and `sort` used to before #13154).
After this PR, the type of the pipeline input is checked to ensure it
matches one of the input types listed in the proceeding command's
input/output types. While each of the issues in the "before this PR"
section could be addressed with each command individually, this PR
solves this issue for _all_ commands.
**This will likely cause some breakage**, as some commands have
incorrect input/output types, and should be adjusted. Also, some scripts
may have erroneous usage of commands. In writing this PR, I discovered
that `toolkit.nu` was passing `null` values to `str join`, which doesn't
accept nothing types (if folks think it should, we can adjust it in this
PR or in a different PR). I found some issues in the standard library
and its tests. I also found that carapace's vendor script had an
incorrect chaining of `get -i`:
```nushell
let expanded_alias = (scope aliases | where name == $spans.0 | get -i 0 | get -i expansion)
```
Before this PR, if the `get -i 0` ever actually did evaluate to `null`,
the second `get` invocation would error since `get` doesn't operate on
`null` values. After this PR, this is immediately a run-time error,
alerting the user to the problematic code. As a side note, we'll need to
PR this fix (`get -i 0 | get -i expansion` -> `get -i 0.expansion`) to
carapace.
A notable exception to the type checking is commands with input type of
`nothing -> <type>`. In this case, any input type is allowed. This
allows piping values into the command without an error being thrown. For
example, `123 | echo $in` would be an error without this exception.
Additionally, custom types bypass type checking (I believe this also
happens during parsing, but not certain)
I added a `is_subtype` method to `Value` and `PipelineData`. It
functions slightly differently than `get_type().is_subtype()`, as noted
in the doccomments. Notably, it respects structural typing of lists and
tables. For example, the type of a value `[{a: 123} {a: 456, b: 789}]`
is a subtype of `table<a: int>`, whereas the type returned by
`Value::get_type` is a `list<any>`. Similarly, `PipelineData` has some
special handling for `ListStream`s and `ByteStream`s. The latter was
needed for this PR to work properly with external commands.
Here's some examples.
Before:
```nu
1..2 | drop nth 1
Error: nu::parser::input_type_mismatch
× Command does not support range input.
╭─[entry #9:1:8]
1 │ 1..2 | drop nth 1
· ────┬───
· ╰── command doesn't support range input
╰────
echo 1..2 | drop nth 1
# => ╭───┬───╮
# => │ 0 │ 1 │
# => ╰───┴───╯
```
After this PR, I've adjusted `drop nth`'s input/output types to accept
range input.
Before this PR, zip accepted any value despite not being listed in its
input/output types. This caused different behavior depending on if you
triggered a parse error or not:
```nushell
1 | zip [2]
# => Error: nu::parser::input_type_mismatch
# =>
# => × Command does not support int input.
# => ╭─[entry #3:1:5]
# => 1 │ 1 | zip [2]
# => · ─┬─
# => · ╰── command doesn't support int input
# => ╰────
echo 1 | zip [2]
# => ╭───┬───────────╮
# => │ 0 │ ╭───┬───╮ │
# => │ │ │ 0 │ 1 │ │
# => │ │ │ 1 │ 2 │ │
# => │ │ ╰───┴───╯ │
# => ╰───┴───────────╯
```
After this PR, it works the same in both cases. For cases like this, if
we do decide we want `zip` or other commands to accept any input value,
then we should explicitly add that to the input types.
```nushell
1 | zip [2]
# => Error: nu::parser::input_type_mismatch
# =>
# => × Command does not support int input.
# => ╭─[entry #3:1:5]
# => 1 │ 1 | zip [2]
# => · ─┬─
# => · ╰── command doesn't support int input
# => ╰────
echo 1 | zip [2]
# => Error: nu:🐚:only_supports_this_input_type
# =>
# => × Input type not supported.
# => ╭─[entry #14:2:6]
# => 2 │ echo 1 | zip [2]
# => · ┬ ─┬─
# => · │ ╰── only list<any> and range input data is supported
# => · ╰── input type: int
# => ╰────
```
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
**Breaking change**: The type of a command's input is now checked
against the input/output types of that command at run-time. While these
errors should mostly be caught at parse-time, in cases where they can't
be detected at parse-time they will be caught at run-time instead. This
applies to both internal commands and custom commands.
Example function and corresponding parse-time error (same before and
after PR):
```nushell
def foo []: int -> nothing {
print $"my cool int is ($in)"
}
1 | foo
# => my cool int is 1
"evil string" | foo
# => Error: nu::parser::input_type_mismatch
# =>
# => × Command does not support string input.
# => ╭─[entry #16:1:17]
# => 1 │ "evil string" | foo
# => · ─┬─
# => · ╰── command doesn't support string input
# => ╰────
# =>
```
Before:
```nu
echo "evil string" | foo
# => my cool int is evil string
```
After:
```nu
echo "evil string" | foo
# => Error: nu:🐚:only_supports_this_input_type
# =>
# => × Input type not supported.
# => ╭─[entry #17:1:6]
# => 1 │ echo "evil string" | foo
# => · ──────┬────── ─┬─
# => · │ ╰── only int input data is supported
# => · ╰── input type: string
# => ╰────
```
Known affected internal commands which erroneously accepted any type:
* `str join`
* `zip`
* `reduce`
# Tests + Formatting
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Make sure you've run and fixed any issues with these commands:
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tests for the standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
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* Play whack-a-mole with the commands and scripts this will inevitably
break
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# Description
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guide](../CONTRIBUTING.md) and talk to the core team before making major
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I realized that the `into bool` command somehow implements a conversion
into a boolean value which was very similar to my implementation of
~`Value::as_env_bool`~ `Value::coerce_bool`. To streamline that behavior
a bit, I replaced most of the implementation of `into bool` with my
~`Value::as_env_bool`~ `Value::coerce_bool` method.
Also I added a new flag called `--relaxed` which lets the command behave
more closely to the ~`Value::as_env_bool`~ `Value::coerce_bool` method
as it allows null values and is more loose to strings. ~Which now begs
the question, should I rename `Value::as_env_bool` just to
`Value::coerce_bool` which would fit the `Value::coerce_str` method
name?~ (Renamed that.)
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
The `into bool` command behaves the same but with `--relaxed` you can
also throw a `null` or some more strings at it which makes it more
ergonomic for env conversions.
# Tests + Formatting
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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)
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check that you're using the standard code style
- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the
tests for the standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->
I added some more tests to see that the strict handling works and added
some more examples to the command to showcase the `--relaxed` flag which
also gets tested.
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# 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.
-->
@Bahex mentioned in #14704 that it broke the zoxide script, this PR
should help to fix the issue.
# Description
We removed the regex crate long ago but there were a few instances where
we could not remove it because fancy-regex did not have a split/splitn,
and maybe other functions. Those functions now exist in the latest
fancy-regex crate so we can now remove it.
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
# Tests + Formatting
<!--
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Make sure you've run and fixed any issues with these commands:
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fmt --all` applies these changes)
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check that you're using the standard code style
- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the
tests for the standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->
# After Submitting
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documentation](https://github.com/nushell/nushell.github.io) after the
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-->
# Description
Remove usages of `internal_span` in matches and initializers. I think
this should be the last of the usages, meaning `internal_span` can
finally be refactored out of `Value`(!?)
Stumbled over unnecessary `pub` `fn action` and `struct Arguments` when
reworking `into bits` in #14634
Stuff like this should be local until proven otherwise and then named
approrpiately.
# Description
Implements #11234 based on the comments there:
* (Previously implemented): `into record` handles nanoseconds (as well
as milliseconds and microseconds, which the deprecated commands didn't
support).
* Added deprecation warning to `date to-record` and `date to-table`
* Added new example for `into record` showing the conversion to a table
* Changed `std/dt` to use `into record`
* Added "Deprecated" category back to nu-protocol::Signature
* Assigned the deprecated commands to the Deprecated category so be
categorized properly in the online Doc.
# User-Facing Changes
Deprecated command warning
# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
Searched doc for existing uses of `date to-record` and `date to-table`:
* For primary English-language docs, there are no uses other than in the
auto-generated command help, which will be updated based on this PR
* Other language translations appear to have an old use in several
places and will need to be updated to match the English-language doc.
# Description
Adds a new `Filesize` type so that `FromValue` can be used to convert a
`Value::Filesize` to a `Filesize`. Currently, to extract a filesize from
a `Value` using `FromValue`, you have to extract an `i64` which coerces
`Value::Int`, `Value::Duration`, and `Value::Filesize` to an `i64`.
Having a separate type also allows us to enforce checked math to catch
overflows. Similarly, it allows us to specify other trait
implementations like `Display` in a common place.
# User-Facing Changes
Multiplication with filesizes now error on overflow. Should not be a
breaking change for plugins (i.e., serialization) since `Filesize` is
marked with `serde(transparent)`.
# Tests + Formatting
Updated some tests.
# Description
Fixes test which was ignored in #14297. Also fixes related example.
Tests now use local timezone to match actual result.
More discussion in #14266
# User-Facing Changes
Tests-only
# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
N/A
# Description
Since the human-date-parser was switched to use the users local
timezone, this test may not be needed anymore. I've just ignored it for
now and put a comment about why it's being ignored.
There are more discussions on this topic here
https://github.com/nushell/nushell/pull/14266
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
# Tests + Formatting
<!--
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Make sure you've run and fixed any issues with these commands:
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check that you're using the standard code style
- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the
tests for the standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->
# After Submitting
<!-- If your PR had any user-facing changes, update [the
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-->
# Description
This PR tries to fix https://github.com/nushell/nushell/issues/14195 by
setting the local time and timezone after conversion without changing
the time.
### Before
```nushell
❯ 'in 10 minutes' | into datetime
Tue, 5 Nov 2024 12:59:58 -0600 (in 9 minutes)
❯ 'yesterday' | into datetime
Sun, 3 Nov 2024 18:00:00 -0600 (2 days ago)
❯ 'tomorrow' | into datetime
Tue, 5 Nov 2024 18:00:00 -0600 (in 5 hours)
❯ 'today' | into datetime
Mon, 4 Nov 2024 18:00:00 -0600 (18 hours ago)
```
### After (these are correct)
```nushell
❯ 'in 10 minutes' | into datetime
Tue, 5 Nov 2024 12:58:44 -0600 (in 9 minutes)
❯ 'yesterday' | into datetime
Mon, 4 Nov 2024 12:49:04 -0600 (a day ago)
❯ 'tomorrow' | into datetime
Wed, 6 Nov 2024 12:49:20 -0600 (in a day)
❯ 'today' | into datetime
Tue, 5 Nov 2024 12:52:06 -0600 (now)
```
# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->
# Tests + Formatting
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- `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the
tests for the standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->
# After Submitting
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# Description
Turns out there are duplicate conversion functions: `as_i64` and
`as_f64`. In most cases, these can be replaced with `as_int` and
`as_float`, respectively.
Closes#13654
# User-Facing Changes
- Short flags are now fully type-checked,
including null and record signatures for literal arguments:
```nushell
def test [-v: record<l: int>] {};
test -v null # error
test -v {l: ""} # error
def test2 [-v: int] {};
let v = ""
test2 -v $v # error
```
- `polars unpivot` `--index`/`--on` and `into value --columns`
now accept `list` values
Closes#13654
# User-Facing Changes
- Short flags are now fully type-checked,
including null and record signatures for literal arguments:
```nushell
def test [-v: record<l: int>] {};
test -v null # error
test -v {l: ""} # error
def test2 [-v: int] {};
let v = ""
test2 -v $v # error
```
- `polars unpivot` `--index`/`--on` and `into value --columns`
now accept `list` values
# Description
From [Discord
today](https://discord.com/channels/601130461678272522/729071784321876040/1286904159047778316),
`into value` isn't classified with `conversions` like the other `into
...` subcommands. I think this is correct, since it's a `table->table`
operation, so it's a filter that has the side effect of (potentially)
converting (via inference) cell values.
But we should at least have some search terms that help here, so this PR
adds *"conversion"* and *"convert"* to the command.
# User-Facing Changes
`help -f conversion` will return `into value`
# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
N/A
# Description
The meaning of the word usage is specific to describing how a command
function is *used* and not a synonym for general description. Usage can
be used to describe the SYNOPSIS or EXAMPLES sections of a man page
where the permitted argument combinations are shown or example *uses*
are given.
Let's not confuse people and call it what it is a description.
Our `help` command already creates its own *Usage* section based on the
available arguments and doesn't refer to the description with usage.
# User-Facing Changes
`help commands` and `scope commands` will now use `description` or
`extra_description`
`usage`-> `description`
`extra_usage` -> `extra_description`
Breaking change in the plugin protocol:
In the signature record communicated with the engine.
`usage`-> `description`
`extra_usage` -> `extra_description`
The same rename also takes place for the methods on
`SimplePluginCommand` and `PluginCommand`
# Tests + Formatting
- Updated plugin protocol specific changes
# After Submitting
- [ ] update plugin protocol doc
# Description
The previous behaviour of `into record` on lists was to create a new
record with each list index as the key. This was not very useful for
creating meaningful records, though, and most people would end up using
commands like `headers` or `transpose` to turn a list of keys and values
into a record.
This PR changes that instead to do what I think the most ergonomic thing
is, and instead:
- A list of records is merged into one record.
- A list of pairs (two element lists) is folded into a record with the
first element of each pair being the key, and the second being the
value.
The former is just generally more useful than having to use `reduce`
with `merge` for such a common operation, and the latter is useful
because it means that `$a | zip $b | into record` *just works* in the
way that seems most obvious.
Example:
```nushell
[[foo bar] [baz quux]] | into record # => {foo: bar, baz: quux}
[{foo: bar} {baz: quux}] | into record # => {foo: bar, baz: quux}
[foo baz] | zip [bar quux] | into record # => {foo: bar, baz: quux}
```
The support for range input has been removed, as it would no longer
reflect the treatment of an equivalent list.
The following is equivalent to the old behavior, in case that's desired:
```
0.. | zip [a b c] | into record # => {0: a, 1: b, 2: c}
```
# User-Facing Changes
- `into record` changed as described above (breaking)
- `into record` no longer supports range input (breaking)
# Tests + Formatting
Examples changed to match, everything works. Some usage in stdlib and
`nu_plugin_nu_example` had to be changed.
# After Submitting
- [ ] release notes (commands, breaking change)
# Description
When using a format string, `into datetime` would disallow an `int` even
when it logically made sense. This was mainly a problem when attempting
to convert a Unix epoch to Nushell `datetime`. Unix epochs are often
stored or returned as `int` in external data sources.
```nu
1722821463 | into datetime -f '%s'
Error: nu:🐚:only_supports_this_input_type
× Input type not supported.
╭─[entry #3:1:1]
1 │ 1722821463 | into datetime -f '%s'
· ─────┬──── ──────┬──────
· │ ╰── only string input data is supported
· ╰── input type: int
╰────
```
While the solution was simply to `| to text` the `int`, this PR handles
the use-case automatically.
Essentially a ~5 line change that just moves the current parsing to a
closure that is called for both Strings and Ints-converted-to-Strings.
# User-Facing Changes
After the change:
```nu
[
1722821463
"1722821463"
0
] | each { into datetime -f '%s' }
╭───┬──────────────╮
│ 0 │ 10 hours ago │
│ 1 │ 10 hours ago │
│ 2 │ 54 years ago │
╰───┴──────────────╯
```
# Tests + Formatting
Test case added.
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
# Description
Allows `Stack` to have a modified local `Config`, which is updated
immediately when `$env.config` is assigned to. This means that even
within a script, commands that come after `$env.config` changes will
always see those changes in `Stack::get_config()`.
Also fixed a lot of cases where `engine_state.get_config()` was used
even when `Stack` was available.
Closes#13324.
# User-Facing Changes
- Config changes apply immediately after the assignment is executed,
rather than whenever config is read by a command that needs it.
- Potentially slower performance when executing a lot of lines that
change `$env.config` one after another. Recommended to get `$env.config`
into a `mut` variable first and do modifications, then assign it back.
- Much faster performance when executing a script that made
modifications to `$env.config`, as the changes are only parsed once.
# Tests + Formatting
All passing.
# After Submitting
- [ ] release notes
# Description
This PR introduces a new `Signals` struct to replace our adhoc passing
around of `ctrlc: Option<Arc<AtomicBool>>`. Doing so has a few benefits:
- We can better enforce when/where resetting or triggering an interrupt
is allowed.
- Consolidates `nu_utils::ctrl_c::was_pressed` and other ad-hoc
re-implementations into a single place: `Signals::check`.
- This allows us to add other types of signals later if we want. E.g.,
exiting or suspension.
- Similarly, we can more easily change the underlying implementation if
we need to in the future.
- Places that used to have a `ctrlc` of `None` now use
`Signals::empty()`, so we can double check these usages for correctness
in the future.
# Description
Fixes#13280. After apply this patch, we can use non-timezone string +
format option `into datetime` cmd
# User-Facing Changes
AS-IS (before fixing)
```
$ "09.02.2024 11:06:11" | into datetime --format '%m.%d.%Y %T'
Error: nu:🐚:cant_convert
× Can't convert to could not parse as datetime using format '%m.%d.%Y %T'.
╭─[entry #1:1:25]
1 │ "09.02.2024 11:06:11" | into datetime --format '%m.%d.%Y %T'
· ──────┬──────
· ╰── can't convert input is not enough for unique date and time to could not parse as datetime using format '%m.%d.%Y %T'
╰────
help: you can use `into datetime` without a format string to enable flexible parsing
$ "09.02.2024 11:06:11" | into datetime
Mon, 2 Sep 2024 11:06:11 +0900 (in 2 months)
```
TO-BE(After fixing)
```
$ "09.02.2024 11:06:11" | into datetime --format '%m.%d.%Y %T'
Mon, 2 Sep 2024 20:06:11 +0900 (in 2 months)
$ "09.02.2024 11:06:11" | into datetime
Mon, 2 Sep 2024 11:06:11 +0900 (in 2 months)
```
# Tests + Formatting
If there is agreement on the direction, I will add a test.
# After Submitting
---------
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
# Description
After discussing with @sholderbach the cumbersome usage of
`nu_protocol::Value` in Rust, I created a derive macro to simplify it.
I’ve added a new crate called `nu-derive-value`, which includes two
macros, `IntoValue` and `FromValue`. These are re-exported in
`nu-protocol` and should be encouraged to be used via that re-export.
The macros ensure that all types can easily convert from and into
`Value`. For example, as a plugin author, you can define your plugin
configuration using a Rust struct and easily convert it using
`FromValue`. This makes plugin configuration less of a hassle.
I introduced the `IntoValue` trait for a standardized approach to
converting values into `Value` (and a fallible variant `TryIntoValue`).
This trait could potentially replace existing `into_value` methods.
Along with this, I've implemented `FromValue` for several standard types
and refined other implementations to use blanket implementations where
applicable.
I made these design choices with input from @devyn.
There are more improvements possible, but this is a solid start and the
PR is already quite substantial.
# User-Facing Changes
For `nu-protocol` users, these changes simplify the handling of
`Value`s. There are no changes for end-users of nushell itself.
# Tests + Formatting
Documenting the macros itself is not really possible, as they cannot
really reference any other types since they are the root of the
dependency graph. The standard library has the same problem
([std::Debug](https://doc.rust-lang.org/stable/std/fmt/derive.Debug.html)).
However I documented the `FromValue` and `IntoValue` traits completely.
For testing, I made of use `proc-macro2` in the derive macro code. This
would allow testing the generated source code. Instead I just tested
that the derived functionality is correct. This is done in
`nu_protocol::value::test_derive`, as a consumer of `nu-derive-value`
needs to do the testing of the macro usage. I think that these tests
should provide a stable baseline so that users can be sure that the impl
works.
# After Submitting
With these macros available, we can probably use them in some examples
for plugins to showcase the use of them.
# Description
Fixes https://github.com/nushell/nushell/issues/12968. After apply this
patch, we can use explict plus sign character included string with `into
filesize` cmd.
# User-Facing Changes
AS-IS (before fixing)
```
$ "+8 KiB" | into filesize
Error: nu:🐚:cant_convert
× Can't convert to int.
╭─[entry #31:1:1]
1 │ "+8 KiB" | into filesize
· ────┬───
· ╰── can't convert string to int
╰────
```
TO-BE (after fixing)
```
$ "+8KiB" | into filesize
8.0 KiB
```
# Tests + Formatting
Added a test
# 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.
-->
# Description
Currently, this pipeline doesn't work `open --raw file | take 100`,
since the type of the byte stream is `Unknown`, but `take` expects
`Binary` streams. This PR changes commands that expect
`ByteStreamType::Binary` to also work with `ByteStreamType::Unknown`.
This was done by adding two new methods to `ByteStreamType`:
`is_binary_coercible` and `is_string_coercible`. These return true if
the type is `Unknown` or matches the type in the method name.
# Description
This PR allows byte streams to optionally be colored as being
specifically binary or string data, which guarantees that they'll be
converted to `Binary` or `String` appropriately on `into_value()`,
making them compatible with `Type` guarantees. This makes them
significantly more broadly usable for command input and output.
There is still an `Unknown` type for byte streams coming from external
commands, which uses the same behavior as we previously did where it's a
string if it's UTF-8.
A small number of commands were updated to take advantage of this, just
to prove the point. I will be adding more after this merges.
# User-Facing Changes
- New types in `describe`: `string (stream)`, `binary (stream)`
- These commands now return a stream if their input was a stream:
- `into binary`
- `into string`
- `bytes collect`
- `str join`
- `first` (binary)
- `last` (binary)
- `take` (binary)
- `skip` (binary)
- Streams that are explicitly binary colored will print as a streaming
hexdump
- example:
```nushell
1.. | each { into binary } | bytes collect
```
# Tests + Formatting
I've added some tests to cover it at a basic level, and it doesn't break
anything existing, but I do think more would be nice. Some of those will
come when I modify more commands to stream.
# After Submitting
There are a few things I'm not quite satisfied with:
- **String trimming behavior.** We automatically trim newlines from
streams from external commands, but I don't think we should do this with
internal commands. If I call a command that happens to turn my string
into a stream, I don't want the newline to suddenly disappear. I changed
this to specifically do it only on `Child` and `File`, but I don't know
if this is quite right, and maybe we should bring back the old flag for
`trim_end_newline`
- **Known binary always resulting in a hexdump.** It would be nice to
have a `print --raw`, so that we can put binary data on stdout
explicitly if we want to. This PR doesn't change how external commands
work though - they still dump straight to stdout.
Otherwise, here's the normal checklist:
- [ ] release notes
- [ ] docs update for plugin protocol changes (added `type` field)
---------
Co-authored-by: Ian Manske <ian.manske@pm.me>
# Description
Changes `get_full_help` to take a `&dyn Command` instead of multiple
arguments (`&Signature`, `&Examples` `is_parser_keyword`). All of these
arguments can be gathered from a `Command`, so there is no need to pass
the pieces to `get_full_help`.
This PR also fixes an issue where the search terms are not shown if
`--help` is used on a command.
# Description
Kind of a vague title, but this PR does two main things:
1. Rather than overriding functions like `Command::is_parser_keyword`,
this PR instead changes commands to override `Command::command_type`.
The `CommandType` returned by `Command::command_type` is then used to
automatically determine whether `Command::is_parser_keyword` and the
other `is_{type}` functions should return true. These changes allow us
to remove the `CommandType::Other` case and should also guarantee than
only one of the `is_{type}` functions on `Command` will return true.
2. Uses the new, reworked `Command::command_type` function in the `scope
commands` and `which` commands.
# User-Facing Changes
- Breaking change for `scope commands`: multiple columns (`is_builtin`,
`is_keyword`, `is_plugin`, etc.) have been merged into the `type`
column.
- Breaking change: the `which` command can now report `plugin` or
`keyword` instead of `built-in` in the `type` column. It may also now
report `external` instead of `custom` in the `type` column for known
`extern`s.
# Description
This PR introduces a `ByteStream` type which is a `Read`-able stream of
bytes. Internally, it has an enum over three different byte stream
sources:
```rust
pub enum ByteStreamSource {
Read(Box<dyn Read + Send + 'static>),
File(File),
Child(ChildProcess),
}
```
This is in comparison to the current `RawStream` type, which is an
`Iterator<Item = Vec<u8>>` and has to allocate for each read chunk.
Currently, `PipelineData::ExternalStream` serves a weird dual role where
it is either external command output or a wrapper around `RawStream`.
`ByteStream` makes this distinction more clear (via `ByteStreamSource`)
and replaces `PipelineData::ExternalStream` in this PR:
```rust
pub enum PipelineData {
Empty,
Value(Value, Option<PipelineMetadata>),
ListStream(ListStream, Option<PipelineMetadata>),
ByteStream(ByteStream, Option<PipelineMetadata>),
}
```
The PR is relatively large, but a decent amount of it is just repetitive
changes.
This PR fixes#7017, fixes#10763, and fixes#12369.
This PR also improves performance when piping external commands. Nushell
should, in most cases, have competitive pipeline throughput compared to,
e.g., bash.
| Command | Before (MB/s) | After (MB/s) | Bash (MB/s) |
| -------------------------------------------------- | -------------:|
------------:| -----------:|
| `throughput \| rg 'x'` | 3059 | 3744 | 3739 |
| `throughput \| nu --testbin relay o> /dev/null` | 3508 | 8087 | 8136 |
# User-Facing Changes
- This is a breaking change for the plugin communication protocol,
because the `ExternalStreamInfo` was replaced with `ByteStreamInfo`.
Plugins now only have to deal with a single input stream, as opposed to
the previous three streams: stdout, stderr, and exit code.
- The output of `describe` has been changed for external/byte streams.
- Temporary breaking change: `bytes starts-with` no longer works with
byte streams. This is to keep the PR smaller, and `bytes ends-with`
already does not work on byte streams.
- If a process core dumped, then instead of having a `Value::Error` in
the `exit_code` column of the output returned from `complete`, it now is
a `Value::Int` with the negation of the signal number.
# After Submitting
- Update docs and book as necessary
- Release notes (e.g., plugin protocol changes)
- Adapt/convert commands to work with byte streams (high priority is
`str length`, `bytes starts-with`, and maybe `bytes ends-with`).
- Refactor the `tee` code, Devyn has already done some work on this.
---------
Co-authored-by: Devyn Cairns <devyn.cairns@gmail.com>
# Description
Does some misc changes to `ListStream`:
- Moves it into its own module/file separate from `RawStream`.
- `ListStream`s now have an associated `Span`.
- This required changes to `ListStreamInfo` in `nu-plugin`. Note sure if
this is a breaking change for the plugin protocol.
- Hides the internals of `ListStream` but also adds a few more methods.
- This includes two functions to more easily alter a stream (these take
a `ListStream` and return a `ListStream` instead of having to go through
the whole `into_pipeline_data(..)` route).
- `map`: takes a `FnMut(Value) -> Value`
- `modify`: takes a function to modify the inner stream.
# Description
Judiciously try to avoid allocations/clone by changing the signature of
functions
- **Don't pass str by value unnecessarily if only read**
- **Don't require a vec in `Sandbox::with_files`**
- **Remove unnecessary string clone**
- **Fixup unnecessary borrow**
- **Use `&str` in shape color instead**
- **Vec -> Slice**
- **Elide string clone**
- **Elide `Path` clone**
- **Take &str to elide clone in tests**
# User-Facing Changes
None
# Tests + Formatting
This touches many tests purely in changing from owned to borrowed/static
data
# Description
Continuing from #12568, this PR further reduces the size of `Expr` from
64 to 40 bytes. It also reduces `Expression` from 128 to 96 bytes and
`Type` from 32 to 24 bytes.
This was accomplished by:
- for `Expr` with multiple fields (e.g., `Expr::Thing(A, B, C)`),
merging the fields into new AST struct types and then boxing this struct
(e.g. `Expr::Thing(Box<ABC>)`).
- replacing `Vec<T>` with `Box<[T]>` in multiple places. `Expr`s and
`Expression`s should rarely be mutated, if at all, so this optimization
makes sense.
By reducing the size of these types, I didn't notice a large performance
improvement (at least compared to #12568). But this PR does reduce the
memory usage of nushell. My config is somewhat light so I only noticed a
difference of 1.4MiB (38.9MiB vs 37.5MiB).
---------
Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>
# Description
This adds a `SharedCow` type as a transparent copy-on-write pointer that
clones to unique on mutate.
As an initial test, the `Record` within `Value::Record` is shared.
There are some pretty big wins for performance. I'll post benchmark
results in a comment. The biggest winner is nested access, as that would
have cloned the records for each cell path follow before and it doesn't
have to anymore.
The reusability of the `SharedCow` type is nice and I think it could be
used to clean up the previous work I did with `Arc` in `EngineState`.
It's meant to be a mostly transparent clone-on-write that just clones on
`.to_mut()` or `.into_owned()` if there are actually multiple
references, but avoids cloning if the reference is unique.
# User-Facing Changes
- `Value::Record` field is a different type (plugin authors)
# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
- [ ] use for `EngineState`
- [ ] use for `Value::List`
# Description
Currently, `Range` is a struct with a `from`, `to`, and `incr` field,
which are all type `Value`. This PR changes `Range` to be an enum over
`IntRange` and `FloatRange` for better type safety / stronger compile
time guarantees.
Fixes: #11778Fixes: #11777Fixes: #11776Fixes: #11775Fixes: #11774Fixes: #11773Fixes: #11769.
# User-Facing Changes
Hopefully none, besides bug fixes.
Although, the `serde` representation might have changed.
# Description
The second `Value` is redundant and will consume five extra bytes on
each transmission of a custom value to/from a plugin.
# User-Facing Changes
This is a breaking change to the plugin protocol.
The [example in the protocol
reference](https://www.nushell.sh/contributor-book/plugin_protocol_reference.html#value)
becomes
```json
{
"Custom": {
"val": {
"type": "PluginCustomValue",
"name": "database",
"data": [36, 190, 127, 40, 12, 3, 46, 83],
"notify_on_drop": true
},
"span": {
"start": 320,
"end": 340
}
}
}
```
instead of
```json
{
"CustomValue": {
...
}
}
```
# After Submitting
Update plugin protocol reference
# Description
When implementing a `Command`, one must also import all the types
present in the function signatures for `Command`. This makes it so that
we often import the same set of types in each command implementation
file. E.g., something like this:
```rust
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
ShellError, Signature, Span, Type, Value,
};
```
This PR adds the `nu_engine::command_prelude` module which contains the
necessary and commonly used types to implement a `Command`:
```rust
// command_prelude.rs
pub use crate::CallExt;
pub use nu_protocol::{
ast::{Call, CellPath},
engine::{Command, EngineState, Stack},
record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, IntoSpanned,
PipelineData, Record, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
};
```
This should reduce the boilerplate needed to implement a command and
also gives us a place to track the breadth of the `Command` API. I tried
to be conservative with what went into the prelude modules, since it
might be hard/annoying to remove items from the prelude in the future.
Let me know if something should be included or excluded.
