mirror of
https://github.com/nushell/nushell
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c5aa15c7f6
# Description Add `README.md` files to each crate in our workspace (-plugins) and also include it in the `lib.rs` documentation for <docs.rs> (if there is no existing `lib.rs` crate documentation) In all new README I added the defensive comment that the crates are not considered stable for public consumption. If necessary we can adjust this if we deem a crate useful for plugin authors.
47 lines
2.2 KiB
Markdown
47 lines
2.2 KiB
Markdown
<h1 align="center">
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Welcome to the standard library of `nushell`!
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<img src="https://media.giphy.com/media/hvRJCLFzcasrR4ia7z/giphy.gif" width="28"></img>
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</h1>
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The standard library is a pure-`nushell` collection of custom commands which
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provide interactive utilities and building blocks for users writing casual scripts or complex applications.
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To see what's here:
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```text
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> use std
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> scope commands | select name usage | where name =~ "std "
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#┬───────────name────────────┬──────────────────────usage──────────────────────
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0│std assert │Universal assert command
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1│std assert equal │Assert $left == $right
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2│std assert error │Assert that executing the code generates an error
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3│std assert greater │Assert $left > $right
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4│std assert greater or equal│Assert $left >= $right
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... ...
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─┴───────────────────────────┴─────────────────────────────────────────────────
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```
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## :toolbox: Using the standard library in the REPL or in scripts
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All commands in the standard library must be "imported" into the running environment
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(the interactive read-execute-print-loop (REPL) or a `.nu` script) using the
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[`use`](https://nushell.sh/commands/docs/use.html) command.
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You can choose to import the whole module, but then must refer to individual commands with a `std` prefix, e.g:
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```nushell
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use std
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std log debug "Running now"
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std assert (1 == 2)
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```
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Or you can enumerate the specific commands you want to import and invoke them without the `std` prefix.
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```nushell
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use std ["log debug" assert]
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log debug "Running again"
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assert (2 == 1)
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```
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This is probably the form of import you'll want to add to your `env.nu` for interactive use.
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## :pencil2: contribute to the standard library
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You're invited to contribute to the standard library! See [CONTRIBUTING.md] for details
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[CONTRIBUTING.md]: https://github.com/nushell/nushell/blob/main/crates/nu-std/CONTRIBUTING.md
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