# 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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