nushell/crates/nu-std/std/config/mod.nu
Douglas 4ed25b63a6
Always load default env/config values (#14249)
# Release-Notes Short Description

* Nushell now always loads its internal `default_env.nu` before the user
`env.nu` is loaded, then loads the internal `default_config.nu` before
the user's `config.nu` is loaded. This allows for a simpler
user-configuration experience. The Configuration Chapter of the Book
will be updated soon with the new behavior.

# Description

Implements the main ideas in #13671 and a few more:

* Users can now specify only the environment and config options they
want to override in *their* `env.nu` and `config.nu`and yet still have
access to all of the defaults:
* `default_env.nu` (internally defined) will be loaded whenever (and
before) the user's `env.nu` is loaded.
* `default_config.nu` (internally defined) will be loaded whenever (and
before) the user's `config.nu` is loaded.
* No more 900+ line config out-of-the-box.
* Faster startup (again): ~40-45% improvement in launch time with a
default configuration.
* New keys that are added to the defaults in the future will
automatically be available to all users after updating Nushell. No need
to regenerate config to get the new defaults.
* It is now possible to have different internal defaults (which will be
used with `-c` and scripts) vs. REPL defaults. This would have solved
many of the user complaints about the [`display_errors`
implementation](https://www.nushell.sh/blog/2024-09-17-nushell_0_98_0.html#non-zero-exit-codes-are-now-errors-toc).
* A basic "scaffold" `config.nu` and `env.nu` are created on first
launch (if the config directory isn't present).
* Improved "out-of-the-box" experience (OOBE) - No longer asks to create
the files; the minimal scaffolding will be automatically created. If
deleted, they will not be regenerated. This provides a better
"out-of-the-box" experience for the user as they no longer have to make
this decision (without much info on the pros or cons) when first
launching.
* <s>(New: 2024-11-07) Runs the env_conversions process after the
`default_env.nu` is loaded so that users can treat `Path`/`PATH` as
lists in their own config.</s>
* (New: 2024-11-08) Given the changes in #13802, `default_config.nu`
will be a minimal file to minimize load-times. This shaves another (on
my system) ~3ms off the base launch time.
* Related: Keybindings, menus, and hooks that are already internal
defaults are no longer duplicated in `$env.config`. The documentation
will be updated to cover these scenarios.
* (New: 2024-11-08) Move existing "full" `default_config.nu` to
`sample_config.nu` for short-term "documentation" purposes.
* (New: 2024-11-18) Move the `dark-theme` and `light-theme` to Standard
Library and demonstrate their use - Also improves startup times, but
we're reaching the limit of optimization.
* (New: 2024-11-18) Extensively documented/commented `sample_env.nu` and
`sample_config.nu`. These can be displayed in-shell using (for example)
`config nu --sample | nu-highlight | less -R`. Note: Much of this will
eventually be moved to or (some) duplicated in the Doc. But for now,
this some nice in-shell doc that replaces the older
"commented/documented default".
* (New: 2024-11-20) Runs the `ENV_CONVERSIONS` process (1) after the
`default_env.nu` (allows `PATH` to be used as a list in user's `env.nu`)
and (2) before `default_config.nu` is loaded (allows user's
`ENV_CONVERSIONS` from their `env.nu` to be used in their `config.nu`).
* <s>(New: 2024-11-20) The default `ENV_CONVERSIONS` is now an empty
record. The internal Rust code handles `PATH` (and variants) conversions
regardless of the `ENV_CONVERSIONS` variable. This shaves a *very* small
amount of time off the startup.</s> Reset - Looks like there might be a
bug in `nu-enginer::env::ensure_path()` on Windows that would need to be
fixed in order for this to work.

# User-Facing Changes

By default, you shouldn't see much, if any, change when running this
with your existing configuration.

To see the greatest benefit from these changes, you'll probably want to
start with a "fresh" config. This can be easily tested using something
like:

```nushell
let temp_home = (mktemp -d)
$env.XDG_CONFIG_HOME = $temp_home
$env.XDG_DATA_HOME = $temp_home
./target/release/nu
```

You should see a message where the (mostly empty) `env.nu` and
`config.nu` are created on first start. Defaults should be the same (or
similar to) those before the PR. Please let me know if you notice any
differences.

---

Users should now specify configuration in terms of overrides of each
setting. For instance, rather than modifying `history` settings in the
monolithic `config.nu`, the following is recommended in an updated
`config.nu`:

```nu
$env.config.history = {
  file_format: sqlite,
  sync_on_enter: true
  isolation: true
  max_size: 1_000_000
}
```

or even just:

```nu
$env.config.history.file_format = sqlite
$env.config.history.isolation: true
$env.config.history.max_size = 1_000_000
```

Note: It seems many users are already appending a `source my_config.nu`
(or similar pattern) to the end of the existing `config.nu` to make
updates easier. In this case, they will likely want to remove all of the
previous defaults and just move their `my_config.nu` to `config.nu`.

Note: It should be unlikely that there are any breaking changes here,
but there's a slim chance that some code, somewhere, *expects* an
absence of certain config values. Otherwise, all config values are
available before and after this change.

# Tests + Formatting

- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`

# After Submitting

Configuration Chapter (and related) of the doc is currently WIP and will
be finished in time for 0.101 release.
2024-11-20 16:15:15 -06:00

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# Returns a dark-mode theme that can be assigned to $env.config.color_config
export def dark-theme [] {
{
# color for nushell primitives
separator: white
leading_trailing_space_bg: { attr: n } # no fg, no bg, attr none effectively turns this off
header: green_bold
empty: blue
# Closures can be used to choose colors for specific values.
# The value (in this case, a bool) is piped into the closure.
# eg) {|| if $in { 'light_cyan' } else { 'light_gray' } }
bool: light_cyan
int: white
filesize: cyan
duration: white
date: purple
range: white
float: white
string: white
nothing: white
binary: white
cell-path: white
row_index: green_bold
record: white
list: white
block: white
hints: dark_gray
search_result: { bg: red fg: white }
shape_and: purple_bold
shape_binary: purple_bold
shape_block: blue_bold
shape_bool: light_cyan
shape_closure: green_bold
shape_custom: green
shape_datetime: cyan_bold
shape_directory: cyan
shape_external: cyan
shape_externalarg: green_bold
shape_external_resolved: light_yellow_bold
shape_filepath: cyan
shape_flag: blue_bold
shape_float: purple_bold
# shapes are used to change the cli syntax highlighting
shape_garbage: { fg: white bg: red attr: b }
shape_glob_interpolation: cyan_bold
shape_globpattern: cyan_bold
shape_int: purple_bold
shape_internalcall: cyan_bold
shape_keyword: cyan_bold
shape_list: cyan_bold
shape_literal: blue
shape_match_pattern: green
shape_matching_brackets: { attr: u }
shape_nothing: light_cyan
shape_operator: yellow
shape_or: purple_bold
shape_pipe: purple_bold
shape_range: yellow_bold
shape_record: cyan_bold
shape_redirection: purple_bold
shape_signature: green_bold
shape_string: green
shape_string_interpolation: cyan_bold
shape_table: blue_bold
shape_variable: purple
shape_vardecl: purple
shape_raw_string: light_purple
}
}
# Returns a light-mode theme that can be assigned to $env.config.color_config
export def light-theme [] {
{
# color for nushell primitives
separator: dark_gray
leading_trailing_space_bg: { attr: n } # no fg, no bg, attr none effectively turns this off
header: green_bold
empty: blue
# Closures can be used to choose colors for specific values.
# The value (in this case, a bool) is piped into the closure.
# eg) {|| if $in { 'dark_cyan' } else { 'dark_gray' } }
bool: dark_cyan
int: dark_gray
filesize: cyan_bold
duration: dark_gray
date: purple
range: dark_gray
float: dark_gray
string: dark_gray
nothing: dark_gray
binary: dark_gray
cell-path: dark_gray
row_index: green_bold
record: dark_gray
list: dark_gray
block: dark_gray
hints: dark_gray
search_result: { fg: white bg: red }
shape_and: purple_bold
shape_binary: purple_bold
shape_block: blue_bold
shape_bool: light_cyan
shape_closure: green_bold
shape_custom: green
shape_datetime: cyan_bold
shape_directory: cyan
shape_external: cyan
shape_externalarg: green_bold
shape_external_resolved: light_purple_bold
shape_filepath: cyan
shape_flag: blue_bold
shape_float: purple_bold
# shapes are used to change the cli syntax highlighting
shape_garbage: { fg: white bg: red attr: b }
shape_glob_interpolation: cyan_bold
shape_globpattern: cyan_bold
shape_int: purple_bold
shape_internalcall: cyan_bold
shape_keyword: cyan_bold
shape_list: cyan_bold
shape_literal: blue
shape_match_pattern: green
shape_matching_brackets: { attr: u }
shape_nothing: light_cyan
shape_operator: yellow
shape_or: purple_bold
shape_pipe: purple_bold
shape_range: yellow_bold
shape_record: cyan_bold
shape_redirection: purple_bold
shape_signature: green_bold
shape_string: green
shape_string_interpolation: cyan_bold
shape_table: blue_bold
shape_variable: purple
shape_vardecl: purple
shape_raw_string: light_purple
}
}