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Bob Hyman 2e01bf9cba
add dirs command to std lib (#8368) 
# Description

Prototype replacement for `enter`, `n`, `p`, `exit` built-ins
implemented as scripts in standard library.
MVP-level capabilities (rough hack), for feedback please. Not intended
to merge and ship as is.

_(Description of your pull request goes here. **Provide examples and/or
screenshots** if your changes affect the user experience.)_

# User-Facing Changes
New command in standard library

```nushell
〉use ~/src/rust/nushell/crates/nu-utils/standard_library/dirs.nu
---------------------------------------------- /home/bobhy ----------------------------------------------
〉help dirs
module dirs.nu -- maintain list of remembered directories + navigate them

todo:
* expand relative to absolute paths (or relative to some prefix?)
* what if user does `cd` by hand?

Module: dirs

Exported commands:
  add (dirs add), drop, next (dirs next), prev (dirs prev), show (dirs show)

This module exports environment.
---------------------------------------------- /home/bobhy ----------------------------------------------
〉dirs add ~/src/rust/nushell /etc ~/.cargo
-------------------------------------- /home/bobhy/src/rust/nushell --------------------------------------
〉dirs next 2
------------------------------------------- /home/bobhy/.cargo -------------------------------------------
〉dirs show
╭───┬─────────┬────────────────────╮
│ # │ current │        path        │
├───┼─────────┼────────────────────┤
│ 0 │         │ /home/bobhy        │
│ 1 │         │ ~/src/rust/nushell │
│ 2 │         │ /etc               │
│ 3 │ ==>     │ ~/.cargo           │
╰───┴─────────┴────────────────────╯
------------------------------------------- /home/bobhy/.cargo -------------------------------------------
〉dirs drop
---------------------------------------------- /home/bobhy ----------------------------------------------
〉dirs show
╭───┬─────────┬────────────────────╮
│ # │ current │        path        │
├───┼─────────┼────────────────────┤
│ 0 │ ==>     │ /home/bobhy        │
│ 1 │         │ ~/src/rust/nushell │
│ 2 │         │ /etc               │
╰───┴─────────┴────────────────────╯
---------------------------------------------- /home/bobhy ----------------------------------------------
〉
```
# Tests + Formatting

Haven't even looked at stdlib `tests.nu` yet.

Other todos:
* address module todos.
* integrate into std lib, rather than as standalone module. Somehow
arrange for `use .../standard_library/std.nu` to load this module
without having to put all the source in `std.nu`?
*  Maybe command should be `std dirs ...`?   
* what else do `enter` and `exit` do that this should do? Then deprecate
those commands.

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.
2023-03-11 16:31:09 -06:00
..
dirs.nu add dirs command to std lib (#8368) 2023-03-11 16:31:09 -06:00
README.md DOC: add a README to the standard library (#8304) 2023-03-04 08:30:36 -06:00
std.nu add dirs command to std lib (#8368) 2023-03-11 16:31:09 -06:00
tests.nu add dirs command to std lib (#8368) 2023-03-11 16:31:09 -06:00

README.md

Welcome to the standard library of `nushell`!

The standard library is a pure-nushell collection of commands to allow anyone to build complex applications using standardized tools gathered incrementally.

In this library, you might find rust-like assert commands to write tests, tools to manipulate paths and strings, etc, etc, ...

🧰 use the standard library in the REPL or in scripts

in order to "import" the standard library to either the interactive REPL of nushell or inside some .nu script, you might want to use the use command!

use /path/to/standard_library/std.nu

🔍 a concrete example

  • my name is @amtoine and i use the ghq tool to manage git projects

Note


ghq stores any repository inside $env.GHQ_ROOT under <host>/<owner>/<repo>/

  • the path to my local fork of nushell is then defined as
let-env NUSHELL_REPO = ($env.GHQ_ROOT | path join "github.com" "amtoine" "nushell")
  • and the full path to the standard library is defined as
let-env STD_LIB = ($env.NUSHELL_REPO | path join "crates" "nu-utils" "standard_library")

see the content of $env.STD_LIB 😋

>_ ls $env.STD_LIB | get name | str replace $env.STD_LIB "" | str trim -l -c "/"
╭───┬───────────╮
│ 0 │ README.md │
│ 1 │ std.nu    │
│ 2 │ tests.nu  │
╰───┴───────────╯
  • finally we can use the standard library and have access to the commands it exposes 👍
>_ use std.nu
>_ help std
Module: std

Exported commands:
  assert (std assert), assert eq (std assert eq), assert ne (std assert ne), match (std match)

This module does not export environment.

✏️ contribute to the standard library

🔧 add new commands

  • add new standard commands to std.nu
  • add associated tests to tests.nu
    • define a new test_<feature> before the main
    • import the assert functions you need at the top of the functions, e.g. use std.nu "assert eq"
    • add a call to test_<feature> at the bottom of the main

🧪 run the tests

the following call should return nothing

nu ($env.STD_LIB | path join "tests.nu")