nushell/crates/nu-std/std/mod.nu

# std.nu, `used` to load all standard library components

export module assert.nu
export module dirs.nu
export module dt.nu
export module formats.nu
export module help.nu
export module input.nu
export module iter.nu
export module log.nu
export module math.nu
export module testing.nu
export module xml.nu
export-env {
    use dirs.nu []
    use log.nu []
}

use dt.nu [datetime-diff, pretty-print-duration]

# Add the given paths to the PATH.
#
# # Example
# - adding some dummy paths to an empty PATH
# ```nushell
# >_ with-env [PATH []] {
#     std path add "foo"
#     std path add "bar" "baz"
#     std path add "fooo" --append
#
#     assert equal $env.PATH ["bar" "baz" "foo" "fooo"]
#
#     print (std path add "returned" --ret)
# }
# ╭───┬──────────╮
# │ 0 │ returned │
# │ 1 │ bar      │
# │ 2 │ baz      │
# │ 3 │ foo      │
# │ 4 │ fooo     │
# ╰───┴──────────╯
# ```
# - adding paths based on the operating system
# ```nushell
# >_ std path add {linux: "foo", windows: "bar", darwin: "baz"}
# ```
export def --env "path add" [
    --ret (-r)  # return $env.PATH, useful in pipelines to avoid scoping.
    --append (-a)  # append to $env.PATH instead of prepending to.
    ...paths  # the paths to add to $env.PATH.
] {
    let span = (metadata $paths).span
    let paths = $paths | flatten

    if ($paths | is-empty) or ($paths | length) == 0 {
        error make {msg: "Empty input", label: {
            text: "Provide at least one string or a record",
            span: $span
        }}
    }

    let path_name = if "PATH" in $env { "PATH" } else { "Path" }

    let paths = $paths | each {|p|
        let p = match ($p | describe | str replace --regex '<.*' '') {
            "string" => $p,
            "record" => { $p | get --ignore-errors $nu.os-info.name },
        }

        $p | path expand
    }

    if null in $paths or ($paths | is-empty) {
        error make {msg: "Empty input", label: {
            text: $"Received a record, that does not contain a ($nu.os-info.name) key",
            span: $span
        }}
    }

    load-env {$path_name: (
        $env
            | get $path_name
            | split row (char esep)
            | path expand
            | if $append { append $paths } else { prepend $paths }
    )}

    if $ret {
        $env | get $path_name
    }
}

# print a command name as dimmed and italic
def pretty-command [] {
    let command = $in
    return $"(ansi default_dimmed)(ansi default_italic)($command)(ansi reset)"
}

# give a hint error when the clip command is not available on the system
def check-clipboard [
    clipboard: string  # the clipboard command name
    --system: string  # some information about the system running, for better error
] {
    if (which $clipboard | is-empty) {
        error make --unspanned {
            msg: $"(ansi red)clipboard_not_found(ansi reset):
    you are running ($system)
    but
    the ($clipboard | pretty-command) clipboard command was not found on your system."
        }
    }
}

# put the end of a pipe into the system clipboard.
#
# Dependencies:
#   - xclip on linux x11
#   - wl-copy on linux wayland
#   - clip.exe on windows
#   - termux-api on termux
#
# Examples:
#     put a simple string to the clipboard, will be stripped to remove ANSI sequences
#     >_ "my wonderful string" | clip
#     my wonderful string
#     saved to clipboard (stripped)
#
#     put a whole table to the clipboard
#     >_ ls *.toml | clip
#     ╭───┬─────────────────────┬──────┬────────┬───────────────╮
#     │ # │        name         │ type │  size  │   modified    │
#     ├───┼─────────────────────┼──────┼────────┼───────────────┤
#     │ 0 │ Cargo.toml          │ file │ 5.0 KB │ 3 minutes ago │
#     │ 1 │ Cross.toml          │ file │  363 B │ 2 weeks ago   │
#     │ 2 │ rust-toolchain.toml │ file │ 1.1 KB │ 2 weeks ago   │
#     ╰───┴─────────────────────┴──────┴────────┴───────────────╯
#
#     saved to clipboard
#
#     put huge structured data in the clipboard, but silently
#     >_ open Cargo.toml --raw | from toml | clip --silent
#
#     when the clipboard system command is not installed
#     >_ "mm this is fishy..." | clip
#     Error:
#       × clipboard_not_found:
#       │     you are using xorg on linux
#       │     but
#       │     the xclip clipboard command was not found on your system.
export def clip [
    --silent # do not print the content of the clipboard to the standard output
    --no-notify  # do not throw a notification (only on linux)
    --no-strip # do not strip ANSI escape sequences from a string
    --expand (-e) # auto-expand the data given as input
    --codepage (-c): int  # the id of the codepage to use (only on Windows), see https://en.wikipedia.org/wiki/Windows_code_page, e.g. 65001 is for UTF-8
] {
    let input = $in

    print $"Warning:   (char -u 26a0) (ansi yellow_bold)deprecated_command(ansi reset)"
    print "| the `std clip` command is deprecated and will be removed in Nushell 0.89"
    print ""
    print $"(ansi cyan)help(ansi reset): please use (ansi {fg: cyan, attr: du})[`modules/system clip`]\(https://github.com/nushell/nu_scripts/tree/main/modules#system\)(ansi reset)"

    let input = $input
        | if $expand { table --expand } else { table }
        | into string
        | if $no_strip {} else { ansi strip }

    match $nu.os-info.name {
        "linux" => {
            if ($env.WAYLAND_DISPLAY? | is-empty) {
                check-clipboard xclip --system $"('xorg' | pretty-command) on linux"
                $input | xclip -sel clip
            } else {
                check-clipboard wl-copy --system $"('wayland' | pretty-command) on linux"
                $input | wl-copy
            }
        },
        "windows" => {
            if $codepage != null {
                chcp $codepage
            }
            check-clipboard clip.exe --system "Windows"
            $input | clip.exe
        },
        "macos" => {
            check-clipboard pbcopy --system "MacOS"
            $input | pbcopy
        },
        "android" => {
            check-clipboard termux-clipboard-set --system "Termux"
            $input | termux-clipboard-set
        },
        _ => {
            error make --unspanned {
                msg: $"(ansi red)unknown_operating_system(ansi reset):
    '($nu.os-info.name)' is not supported by the ('clip' | pretty-command) command.

    please open a feature request in the [issue tracker](char lparen)https://github.com/nushell/nushell/issues/new/choose(char rparen) to add your operating system to the standard library."
            }
        },
    }

    if not $silent {
        print $input
        print $"(ansi white_italic)(ansi white_dimmed)saved to clipboard(ansi reset)"
    }

    if (not $no_notify) and ($nu.os-info.name == linux) {
        notify-send "std clip" "saved to clipboard"
    }
}

# convert an integer amount of nanoseconds to a real duration
def "from ns" [] {
    [$in "ns"] | str join | into duration
}

# run a piece of `nushell` code multiple times and measure the time of execution.
#
# this command returns a benchmark report of the following form:
# ```
# record<
#   mean: duration
#   std: duration
#   times: list<duration>
# >
# ```
#
# > **Note**
# > `std bench --pretty` will return a `string`.
#
# # Examples
#     measure the performance of simple addition
#     > std bench { 1 + 2 } -n 10 | table -e
#     ╭───────┬────────────────────╮
#     │ mean  │ 4µs 956ns          │
#     │ std   │ 4µs 831ns          │
#     │       │ ╭───┬────────────╮ │
#     │ times │ │ 0 │ 19µs 402ns │ │
#     │       │ │ 1 │  4µs 322ns │ │
#     │       │ │ 2 │  3µs 352ns │ │
#     │       │ │ 3 │  2µs 966ns │ │
#     │       │ │ 4 │        3µs │ │
#     │       │ │ 5 │   3µs 86ns │ │
#     │       │ │ 6 │   3µs 84ns │ │
#     │       │ │ 7 │  3µs 604ns │ │
#     │       │ │ 8 │   3µs 98ns │ │
#     │       │ │ 9 │  3µs 653ns │ │
#     │       │ ╰───┴────────────╯ │
#     ╰───────┴────────────────────╯
#
#     get a pretty benchmark report
#     > std bench { 1 + 2 } --pretty
#     3µs 125ns +/- 2µs 408ns
export def bench [
    code: closure  # the piece of `nushell` code to measure the performance of
    --rounds (-n): int = 50  # the number of benchmark rounds (hopefully the more rounds the less variance)
    --verbose (-v) # be more verbose (namely prints the progress)
    --pretty # shows the results in human-readable format: "<mean> +/- <stddev>"
] {
    let times = (
        seq 1 $rounds | each {|i|
            if $verbose { print -n $"($i) / ($rounds)\r" }
            timeit { do $code } | into int | into float
        }
    )

    if $verbose { print $"($rounds) / ($rounds)" }

    let report = {
        mean: ($times | math avg | from ns)
        std: ($times | math stddev | from ns)
        times: ($times | each { from ns })
    }

    if $pretty {
        $"($report.mean) +/- ($report.std)"
    } else {
        $report
    }
}

# print a banner for nushell, with information about the project
#
# Example:
# an example can be found in [this asciinema recording](https://asciinema.org/a/566513)
export def banner [] {
let dt = (datetime-diff (date now) 2019-05-10T09:59:12-07:00)
$"(ansi green)     __  ,(ansi reset)
(ansi green) .--\(\)°'.' (ansi reset)Welcome to (ansi green)Nushell(ansi reset),
(ansi green)'|, . ,'   (ansi reset)based on the (ansi green)nu(ansi reset) language,
(ansi green) !_-\(_\\    (ansi reset)where all data is structured!

Please join our (ansi purple)Discord(ansi reset) community at (ansi purple)https://discord.gg/NtAbbGn(ansi reset)
Our (ansi green_bold)GitHub(ansi reset) repository is at (ansi green_bold)https://github.com/nushell/nushell(ansi reset)
Our (ansi green)Documentation(ansi reset) is located at (ansi green)https://nushell.sh(ansi reset)
(ansi cyan)Tweet(ansi reset) us at (ansi cyan_bold)@nu_shell(ansi reset)
Learn how to remove this at: (ansi green)https://nushell.sh/book/configuration.html#remove-welcome-message(ansi reset)

It's been this long since (ansi green)Nushell(ansi reset)'s first commit:
(pretty-print-duration $dt)

Startup Time: ($nu.startup-time)
"
}

# the cute and friendly mascot of Nushell :)
export def ellie [] {
    let ellie = [
        "     __  ,",
        " .--()°'.'",
        "'|, . ,'",
        " !_-(_\\",
    ]

    $ellie | str join "\n" | $"(ansi green)($in)(ansi reset)"
}

# Return the current working directory
export def pwd [] {
    $env.PWD
}

# repeat anything a bunch of times, yielding a list of *n* times the input
#
# # Examples
#     repeat a string
#     > "foo" | std repeat 3 | str join
#     "foofoofoo"
export def repeat [
    n: int  # the number of repetitions, must be positive
]: any -> list<any> {
    let item = $in

    if $n < 0 {
        let span = metadata $n | get span
        error make {
            msg: $"(ansi red_bold)invalid_argument(ansi reset)"
            label: {
                text: $"n should be a positive integer, found ($n)"
            	span: $span
            }
        }
    }

    if $n == 0 {
        return []
    }

    1..$n | each { $item }
}

# return a null device file.
#
# # Examples
#     run a command and ignore it's stderr output
#     > cat xxx.txt e> (null-device)
export def null-device []: nothing -> path {
    if ($nu.os-info.name | str downcase) == "windows" {
        '\\.\NUL'
    } else {
        "/dev/null"
    }
}