forked from extern/nushell
4be7004289
the other day i heard the story of our friend Ellie the elephant and i
couldn't resist adding it as a command to the standard library 😊
339 lines
11 KiB
Plaintext
339 lines
11 KiB
Plaintext
# std.nu, `used` to load all standard library components
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export-env {
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use dirs.nu []
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use log.nu []
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}
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use dt.nu [datetime-diff, pretty-print-duration]
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use log.nu
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# Add the given paths to the PATH.
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#
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# # Example
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# - adding some dummy paths to an empty PATH
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# ```nushell
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# >_ with-env [PATH []] {
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# std path add "foo"
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# std path add "bar" "baz"
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# std path add "fooo" --append
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#
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# assert equal $env.PATH ["bar" "baz" "foo" "fooo"]
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#
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# print (std path add "returned" --ret)
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# }
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# ╭───┬──────────╮
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# │ 0 │ returned │
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# │ 1 │ bar │
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# │ 2 │ baz │
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# │ 3 │ foo │
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# │ 4 │ fooo │
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# ╰───┴──────────╯
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# ```
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# - adding paths based on the operating system
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# ```nushell
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# >_ std path add {linux: "foo", windows: "bar", darwin: "baz"}
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# ```
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export def --env "path add" [
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--ret (-r) # return $env.PATH, useful in pipelines to avoid scoping.
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--append (-a) # append to $env.PATH instead of prepending to.
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...paths # the paths to add to $env.PATH.
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] {
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let span = (metadata $paths).span
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let paths = ($paths | flatten)
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if ($paths | is-empty) or ($paths | length) == 0 {
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error make {msg: "Empty input", label: {
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text: "Provide at least one string or a record",
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start: $span.start,
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end: $span.end
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}}
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}
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let path_name = if "PATH" in $env { "PATH" } else { "Path" }
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let paths = ($paths | each {|p|
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if ($p | describe) == "string" {
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$p
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} else if ($p | describe | str starts-with "record") {
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$p | get -i $nu.os-info.name
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}
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})
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if null in $paths or ($paths | is-empty) {
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error make {msg: "Empty input", label: {
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text: $"Received a record, that does not contain a ($nu.os-info.name) key",
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start: $span.start,
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end: $span.end
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}}
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}
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load-env {$path_name: (
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$env
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| get $path_name
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| if $append { append $paths }
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else { prepend $paths }
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)}
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if $ret {
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$env | get $path_name
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}
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}
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# print a command name as dimmed and italic
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def pretty-command [] {
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let command = $in
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return $"(ansi default_dimmed)(ansi default_italic)($command)(ansi reset)"
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}
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# give a hint error when the clip command is not available on the system
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def check-clipboard [
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clipboard: string # the clipboard command name
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--system: string # some information about the system running, for better error
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] {
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if (which $clipboard | is-empty) {
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error make --unspanned {
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msg: $"(ansi red)clipboard_not_found(ansi reset):
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you are running ($system)
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but
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the ($clipboard | pretty-command) clipboard command was not found on your system."
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}
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}
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}
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# put the end of a pipe into the system clipboard.
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#
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# Dependencies:
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# - xclip on linux x11
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# - wl-copy on linux wayland
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# - clip.exe on windows
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# - termux-api on termux
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#
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# Examples:
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# put a simple string to the clipboard, will be stripped to remove ANSI sequences
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# >_ "my wonderful string" | clip
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# my wonderful string
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# saved to clipboard (stripped)
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#
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# put a whole table to the clipboard
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# >_ ls *.toml | clip
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# ╭───┬─────────────────────┬──────┬────────┬───────────────╮
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# │ # │ name │ type │ size │ modified │
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# ├───┼─────────────────────┼──────┼────────┼───────────────┤
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# │ 0 │ Cargo.toml │ file │ 5.0 KB │ 3 minutes ago │
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# │ 1 │ Cross.toml │ file │ 363 B │ 2 weeks ago │
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# │ 2 │ rust-toolchain.toml │ file │ 1.1 KB │ 2 weeks ago │
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# ╰───┴─────────────────────┴──────┴────────┴───────────────╯
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#
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# saved to clipboard
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#
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# put huge structured data in the clipboard, but silently
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# >_ open Cargo.toml --raw | from toml | clip --silent
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#
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# when the clipboard system command is not installed
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# >_ "mm this is fishy..." | clip
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# Error:
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# × clipboard_not_found:
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# │ you are using xorg on linux
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# │ but
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# │ the xclip clipboard command was not found on your system.
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export def clip [
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--silent # do not print the content of the clipboard to the standard output
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--no-notify # do not throw a notification (only on linux)
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--no-strip # do not strip ANSI escape sequences from a string
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--expand (-e) # auto-expand the data given as input
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--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
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] {
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let input = (
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$in
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| if $expand { table --expand } else { table }
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| into string
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| if $no_strip {} else { ansi strip }
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)
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match $nu.os-info.name {
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"linux" => {
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if ($env.WAYLAND_DISPLAY? | is-empty) {
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check-clipboard xclip --system $"('xorg' | pretty-command) on linux"
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$input | xclip -sel clip
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} else {
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check-clipboard wl-copy --system $"('wayland' | pretty-command) on linux"
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$input | wl-copy
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}
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},
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"windows" => {
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if $codepage != null {
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chcp $codepage
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}
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check-clipboard clip.exe --system "Windows"
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$input | clip.exe
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},
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"macos" => {
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check-clipboard pbcopy --system "MacOS"
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$input | pbcopy
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},
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"android" => {
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check-clipboard termux-clipboard-set --system "Termux"
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$input | termux-clipboard-set
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},
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_ => {
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error make --unspanned {
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msg: $"(ansi red)unknown_operating_system(ansi reset):
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'($nu.os-info.name)' is not supported by the ('clip' | pretty-command) command.
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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."
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}
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},
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}
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if not $silent {
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print $input
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print $"(ansi white_italic)(ansi white_dimmed)saved to clipboard(ansi reset)"
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}
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if (not $no_notify) and ($nu.os-info.name == linux) {
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notify-send "std clip" "saved to clipboard"
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}
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}
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# convert an integer amount of nanoseconds to a real duration
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def "from ns" [] {
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[$in "ns"] | str join | into duration
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}
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# run a piece of `nushell` code multiple times and measure the time of execution.
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#
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# this command returns a benchmark report of the following form:
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# ```
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# record<
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# mean: duration
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# std: duration
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# times: list<duration>
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# >
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# ```
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#
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# > **Note**
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# > `std bench --pretty` will return a `string`.
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#
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# # Examples
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# measure the performance of simple addition
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# > std bench { 1 + 2 } -n 10 | table -e
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# ╭───────┬────────────────────╮
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# │ mean │ 4µs 956ns │
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# │ std │ 4µs 831ns │
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# │ │ ╭───┬────────────╮ │
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# │ times │ │ 0 │ 19µs 402ns │ │
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# │ │ │ 1 │ 4µs 322ns │ │
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# │ │ │ 2 │ 3µs 352ns │ │
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# │ │ │ 3 │ 2µs 966ns │ │
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# │ │ │ 4 │ 3µs │ │
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# │ │ │ 5 │ 3µs 86ns │ │
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# │ │ │ 6 │ 3µs 84ns │ │
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# │ │ │ 7 │ 3µs 604ns │ │
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# │ │ │ 8 │ 3µs 98ns │ │
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# │ │ │ 9 │ 3µs 653ns │ │
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# │ │ ╰───┴────────────╯ │
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# ╰───────┴────────────────────╯
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#
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# get a pretty benchmark report
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# > std bench { 1 + 2 } --pretty
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# 3µs 125ns +/- 2µs 408ns
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export def bench [
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code: closure # the piece of `nushell` code to measure the performance of
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--rounds (-n): int = 50 # the number of benchmark rounds (hopefully the more rounds the less variance)
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--verbose (-v) # be more verbose (namely prints the progress)
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--pretty # shows the results in human-readable format: "<mean> +/- <stddev>"
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] {
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let times = (
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seq 1 $rounds | each {|i|
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if $verbose { print -n $"($i) / ($rounds)\r" }
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timeit { do $code } | into int | into float
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}
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)
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if $verbose { print $"($rounds) / ($rounds)" }
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let report = {
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mean: ($times | math avg | from ns)
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std: ($times | math stddev | from ns)
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times: ($times | each { from ns })
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}
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if $pretty {
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$"($report.mean) +/- ($report.std)"
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} else {
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$report
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}
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}
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# print a banner for nushell, with information about the project
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#
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# Example:
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# an example can be found in [this asciinema recording](https://asciinema.org/a/566513)
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export def banner [] {
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let dt = (datetime-diff (date now) 2019-05-10T09:59:12-07:00)
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$"(ansi green) __ ,(ansi reset)
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(ansi green) .--\(\)°'.' (ansi reset)Welcome to (ansi green)Nushell(ansi reset),
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(ansi green)'|, . ,' (ansi reset)based on the (ansi green)nu(ansi reset) language,
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(ansi green) !_-\(_\\ (ansi reset)where all data is structured!
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Please join our (ansi purple)Discord(ansi reset) community at (ansi purple)https://discord.gg/NtAbbGn(ansi reset)
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Our (ansi green_bold)GitHub(ansi reset) repository is at (ansi green_bold)https://github.com/nushell/nushell(ansi reset)
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Our (ansi green)Documentation(ansi reset) is located at (ansi green)https://nushell.sh(ansi reset)
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(ansi cyan)Tweet(ansi reset) us at (ansi cyan_bold)@nu_shell(ansi reset)
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Learn how to remove this at: (ansi green)https://nushell.sh/book/configuration.html#remove-welcome-message(ansi reset)
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It's been this long since (ansi green)Nushell(ansi reset)'s first commit:
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(pretty-print-duration $dt)
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Startup Time: ($nu.startup-time)
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"
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}
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# the cute and friendly mascot of Nushell :)
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export def ellie [] {
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let ellie = [
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" __ ,",
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" .--()°'.'",
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"'|, . ,'",
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" !_-(_\\",
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]
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$ellie | str join "\n" | $"(ansi green)($in)(ansi reset)"
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}
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# Return the current working directory
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export def pwd [] {
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$env.PWD
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}
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# repeat anything a bunch of times, yielding a list of *n* times the input
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#
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# # Examples
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# repeat a string
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# > "foo" | std repeat 3 | str join
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# "foofoofoo"
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export def repeat [
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n: int # the number of repetitions, must be positive
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]: any -> list<any> {
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let item = $in
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if $n < 0 {
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let span = metadata $n | get span
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error make {
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msg: $"(ansi red_bold)invalid_argument(ansi reset)"
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label: {
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text: $"n should be a positive integer, found ($n)"
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start: $span.start
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end: $span.end
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}
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}
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}
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if $n == 0 {
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return []
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}
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1..$n | each { $item }
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}
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