mirror of
https://github.com/nushell/nushell
synced 2024-12-28 14:03:09 +00:00
95b78eee25
# Description
The meaning of the word usage is specific to describing how a command
function is *used* and not a synonym for general description. Usage can
be used to describe the SYNOPSIS or EXAMPLES sections of a man page
where the permitted argument combinations are shown or example *uses*
are given.
Let's not confuse people and call it what it is a description.
Our `help` command already creates its own *Usage* section based on the
available arguments and doesn't refer to the description with usage.
# User-Facing Changes
`help commands` and `scope commands` will now use `description` or
`extra_description`
`usage`-> `description`
`extra_usage` -> `extra_description`
Breaking change in the plugin protocol:
In the signature record communicated with the engine.
`usage`-> `description`
`extra_usage` -> `extra_description`
The same rename also takes place for the methods on
`SimplePluginCommand` and `PluginCommand`
# Tests + Formatting
- Updated plugin protocol specific changes
# After Submitting
- [ ] update plugin protocol doc
788 lines
30 KiB
Text
788 lines
30 KiB
Text
def error-fmt [] {
|
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$"(ansi red)($in)(ansi reset)"
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}
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def throw-error [error: string, msg: string, span: record] {
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error make {
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msg: ($error | error-fmt)
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label: {
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text: $msg
|
||
span: $span
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}
|
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}
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}
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def module-not-found-error [span: record] {
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throw-error "std::help::module_not_found" "module not found" $span
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}
|
||
|
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def alias-not-found-error [span: record] {
|
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throw-error "std::help::alias_not_found" "alias not found" $span
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||
}
|
||
|
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def extern-not-found-error [span: record] {
|
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throw-error "std::help::extern_not_found" "extern not found" $span
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}
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||
|
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def operator-not-found-error [span: record] {
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throw-error "std::help::operator_not_found" "operator not found" $span
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||
}
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||
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def command-not-found-error [span: record] {
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throw-error "std::help::command_not_found" "command not found" $span
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}
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||
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def get-all-operators [] { return [
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[type, operator, name, description, precedence];
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[Assignment, =, Assign, "Assigns a value to a variable.", 10]
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[Assignment, +=, PlusAssign, "Adds a value to a variable.", 10]
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||
[Assignment, ++=, AppendAssign, "Appends a list or a value to a variable.", 10]
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||
[Assignment, -=, MinusAssign, "Subtracts a value from a variable.", 10]
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[Assignment, *=, MultiplyAssign, "Multiplies a variable by a value.", 10]
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[Assignment, /=, DivideAssign, "Divides a variable by a value.", 10]
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[Comparison, ==, Equal, "Checks if two values are equal.", 80]
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[Comparison, !=, NotEqual, "Checks if two values are not equal.", 80]
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[Comparison, <, LessThan, "Checks if a value is less than another.", 80]
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[Comparison, <=, LessThanOrEqual, "Checks if a value is less than or equal to another.", 80]
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[Comparison, >, GreaterThan, "Checks if a value is greater than another.", 80]
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[Comparison, >=, GreaterThanOrEqual, "Checks if a value is greater than or equal to another.", 80]
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[Comparison, =~, RegexMatch, "Checks if a value matches a regular expression.", 80]
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[Comparison, !~, NotRegexMatch, "Checks if a value does not match a regular expression.", 80]
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[Comparison, in, In, "Checks if a value is in a list or string.", 80]
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[Comparison, not-in, NotIn, "Checks if a value is not in a list or string.", 80]
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[Comparison, starts-with, StartsWith, "Checks if a string starts with another.", 80]
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[Comparison, ends-with, EndsWith, "Checks if a string ends with another.", 80]
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[Comparison, not, UnaryNot, "Negates a value or expression.", 0]
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[Math, +, Plus, "Adds two values.", 90]
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[Math, ++, Append, "Appends two lists or a list and a value.", 80]
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[Math, -, Minus, "Subtracts two values.", 90]
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[Math, *, Multiply, "Multiplies two values.", 95]
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[Math, /, Divide, "Divides two values.", 95]
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[Math, //, FloorDivision, "Divides two values and floors the result.", 95]
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[Math, mod, Modulo, "Divides two values and returns the remainder.", 95]
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[Math, **, "Pow ", "Raises one value to the power of another.", 100]
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[Bitwise, bit-or, BitOr, "Performs a bitwise OR on two values.", 60]
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[Bitwise, bit-xor, BitXor, "Performs a bitwise XOR on two values.", 70]
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[Bitwise, bit-and, BitAnd, "Performs a bitwise AND on two values.", 75]
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[Bitwise, bit-shl, ShiftLeft, "Shifts a value left by another.", 85]
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[Bitwise, bit-shr, ShiftRight, "Shifts a value right by another.", 85]
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[Boolean, and, And, "Checks if two values are true.", 50]
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[Boolean, or, Or, "Checks if either value is true.", 40]
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[Boolean, xor, Xor, "Checks if one value is true and the other is false.", 45]
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]}
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def "nu-complete list-aliases" [] {
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scope aliases | select name description | rename value description
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}
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def "nu-complete list-modules" [] {
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scope modules | select name description | rename value description
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}
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def "nu-complete list-operators" [] {
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let completions = (
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get-all-operators
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| select name description
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| rename value description
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)
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$completions
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}
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def "nu-complete list-commands" [] {
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scope commands | select name description | rename value description
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}
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def "nu-complete main-help" [] {
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[
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{ value: "commands", description: "Show help on Nushell commands." }
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{ value: "aliases", description: "Show help on Nushell aliases." }
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{ value: "modules", description: "Show help on Nushell modules." }
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{ value: "externs", description: "Show help on Nushell externs." }
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{ value: "operators", description: "Show help on Nushell operators." }
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{ value: "escapes", description: "Show help on Nushell string escapes." }
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]
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| append (nu-complete list-commands)
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}
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def "nu-complete list-externs" [] {
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scope commands | where is_extern | select name description | rename value description
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}
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def build-help-header [
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text: string
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--no-newline (-n)
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] {
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let header = $"(ansi green)($text)(ansi reset):"
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if $no_newline {
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$header
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} else {
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$header ++ "\n"
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}
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}
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def build-module-page [module: record] {
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let description = (if not ($module.description? | is-empty) {[
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$module.description
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""
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]} else { [] })
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let name = [
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$"(build-help-header -n "Module") ($module.name)"
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""
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]
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let commands = (if not ($module.commands? | is-empty) {[
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(build-help-header -n "Exported commands")
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$" (
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$module.commands | each {|command|
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$'($command) (char lparen)($module.name) ($command)(char rparen)'
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}
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| str join ', '
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)"
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""
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]} else { [] })
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let aliases = (if not ($module.aliases? | is-empty) {[
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(build-help-header -n "Exported aliases")
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$" ($module.aliases | str join ', ')"
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""
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]} else { [] })
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let env_block = (if ($module.env_block? | is-empty) {[
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$"This module (ansi cyan)does not export(ansi reset) environment."
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]} else {[
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$"This module (ansi cyan)exports(ansi reset) environment."
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(view source $module.env_block)
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]})
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[$description $name $commands $aliases $env_block] | flatten | str join "\n"
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}
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# Show help on nushell modules.
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#
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# When requesting help for a single module, its commands and aliases will be highlighted if they
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# are also available in the current scope. Commands/aliases that were imported under a different name
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# (such as with a prefix after `use some-module`) will be highlighted in parentheses.
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#
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# Examples:
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# > let us define some example modules to play with
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# > ```nushell
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# > # my foo module
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# > module foo {
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# > def bar [] { "foo::bar" }
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# > export def baz [] { "foo::baz" }
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# >
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# > export-env {
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# > $env.FOO = "foo::FOO"
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# > }
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# > }
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# >
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# > # my bar module
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# > module bar {
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# > def bar [] { "bar::bar" }
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# > export def baz [] { "bar::baz" }
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# >
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# > export-env {
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# > $env.BAR = "bar::BAR"
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# > }
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# > }
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# >
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# > # my baz module
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# > module baz {
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# > def foo [] { "baz::foo" }
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# > export def bar [] { "baz::bar" }
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# >
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# > export-env {
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# > $env.BAZ = "baz::BAZ"
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# > }
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# > }
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# > ```
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#
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# show all aliases
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# > help modules
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# ╭───┬──────┬──────────┬────────────────┬──────────────┬───────────────╮
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# │ # │ name │ commands │ aliases │ env_block │ description │
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# ├───┼──────┼──────────┼────────────────┼──────────────┼───────────────┤
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# │ 0 │ bar │ [baz] │ [list 0 items] │ <Block 1331> │ my bar module │
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# │ 1 │ baz │ [bar] │ [list 0 items] │ <Block 1335> │ my baz module │
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# │ 2 │ foo │ [baz] │ [list 0 items] │ <Block 1327> │ my foo module │
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# ╰───┴──────┴──────────┴────────────────┴──────────────┴───────────────╯
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#
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# search for string in module names
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# > help modules --find ba
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# ╭───┬──────┬─────────────┬────────────────┬──────────────┬───────────────╮
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# │ # │ name │ commands │ aliases │ env_block │ description │
|
||
# ├───┼──────┼─────────────┼────────────────┼──────────────┼───────────────┤
|
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# │ 0 │ bar │ ╭───┬─────╮ │ [list 0 items] │ <Block 1331> │ my bar module │
|
||
# │ │ │ │ 0 │ baz │ │ │ │ │
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||
# │ │ │ ╰───┴─────╯ │ │ │ │
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||
# │ 1 │ baz │ ╭───┬─────╮ │ [list 0 items] │ <Block 1335> │ my baz module │
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||
# │ │ │ │ 0 │ bar │ │ │ │ │
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# │ │ │ ╰───┴─────╯ │ │ │ │
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# ╰───┴──────┴─────────────┴────────────────┴──────────────┴───────────────╯
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#
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# search help for single module
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# > help modules foo
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# my foo module
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#
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# Module: foo
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#
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# Exported commands:
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# baz [foo baz]
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#
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# This module exports environment.
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# {
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# $env.FOO = "foo::FOO"
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# }
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#
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# search for a module that does not exist
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# > help modules "does not exist"
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# Error:
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# × std::help::module_not_found
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# ╭─[entry #21:1:1]
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# 1 │ help modules "does not exist"
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# · ────────┬───────
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# · ╰── module not found
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# ╰────
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export def modules [
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...module: string@"nu-complete list-modules" # the name of module to get help on
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--find (-f): string # string to find in module names
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] {
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let modules = (scope modules)
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if not ($find | is-empty) {
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$modules | find $find --columns [name description]
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} else if not ($module | is-empty) {
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let found_module = ($modules | where name == ($module | str join " "))
|
||
|
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if ($found_module | is-empty) {
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module-not-found-error (metadata $module | get span)
|
||
}
|
||
|
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build-module-page ($found_module | get 0)
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} else {
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$modules
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}
|
||
}
|
||
|
||
def build-alias-page [alias: record] {
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let description = (if not ($alias.description? | is-empty) {[
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$alias.description
|
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""
|
||
]} else { [] })
|
||
|
||
let rest = [
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(build-help-header -n "Alias")
|
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$" ($alias.name)"
|
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""
|
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(build-help-header -n "Expansion")
|
||
$" ($alias.expansion)"
|
||
]
|
||
|
||
[$description $rest] | flatten | str join "\n"
|
||
}
|
||
|
||
# Show help on nushell aliases.
|
||
#
|
||
# Examples:
|
||
# > let us define a bunch of aliases
|
||
# > ```nushell
|
||
# > # my foo alias
|
||
# > alias foo = echo "this is foo"
|
||
# >
|
||
# > # my bar alias
|
||
# > alias bar = echo "this is bar"
|
||
# >
|
||
# > # my baz alias
|
||
# > alias baz = echo "this is baz"
|
||
# >
|
||
# > # a multiline alias
|
||
# > alias multi = echo "this
|
||
# > is
|
||
# > a
|
||
# > multiline
|
||
# > string"
|
||
# > ```
|
||
#
|
||
# show all aliases
|
||
# > help aliases
|
||
# ╭───┬───────┬────────────────────┬───────────────────╮
|
||
# │ # │ name │ expansion │ description │
|
||
# ├───┼───────┼────────────────────┼───────────────────┤
|
||
# │ 0 │ bar │ echo "this is bar" │ my bar alias │
|
||
# │ 1 │ baz │ echo "this is baz" │ my baz alias │
|
||
# │ 2 │ foo │ echo "this is foo" │ my foo alias │
|
||
# │ 3 │ multi │ echo "this │ a multiline alias │
|
||
# │ │ │ is │ │
|
||
# │ │ │ a │ │
|
||
# │ │ │ multiline │ │
|
||
# │ │ │ string" │ │
|
||
# ╰───┴───────┴────────────────────┴───────────────────╯
|
||
#
|
||
# search for string in alias names
|
||
# > help aliases --find ba
|
||
# ╭───┬──────┬────────────────────┬──────────────╮
|
||
# │ # │ name │ expansion │ description │
|
||
# ├───┼──────┼────────────────────┼──────────────┤
|
||
# │ 0 │ bar │ echo "this is bar" │ my bar alias │
|
||
# │ 1 │ baz │ echo "this is baz" │ my baz alias │
|
||
# ╰───┴──────┴────────────────────┴──────────────╯
|
||
#
|
||
# search help for single alias
|
||
# > help aliases multi
|
||
# a multiline alias
|
||
#
|
||
# Alias: multi
|
||
#
|
||
# Expansion:
|
||
# echo "this
|
||
# is
|
||
# a
|
||
# multiline
|
||
# string"
|
||
#
|
||
# search for an alias that does not exist
|
||
# > help aliases "does not exist"
|
||
# Error:
|
||
# × std::help::alias_not_found
|
||
# ╭─[entry #21:1:1]
|
||
# 1 │ help aliases "does not exist"
|
||
# · ────────┬───────
|
||
# · ╰── alias not found
|
||
# ╰────
|
||
export def aliases [
|
||
...alias: string@"nu-complete list-aliases" # the name of alias to get help on
|
||
--find (-f): string # string to find in alias names
|
||
] {
|
||
let aliases = (scope aliases | sort-by name)
|
||
|
||
if not ($find | is-empty) {
|
||
$aliases | find $find --columns [name description]
|
||
} else if not ($alias | is-empty) {
|
||
let found_alias = ($aliases | where name == ($alias | str join " "))
|
||
|
||
if ($found_alias | is-empty) {
|
||
alias-not-found-error (metadata $alias | get span)
|
||
}
|
||
|
||
build-alias-page ($found_alias | get 0)
|
||
} else {
|
||
$aliases
|
||
}
|
||
}
|
||
|
||
def build-extern-page [extern: record] {
|
||
let description = (if not ($extern.description? | is-empty) {[
|
||
$extern.description
|
||
""
|
||
]} else { [] })
|
||
|
||
let rest = [
|
||
(build-help-header -n "Extern")
|
||
$" ($extern.name)"
|
||
]
|
||
|
||
[$description $rest] | flatten | str join "\n"
|
||
}
|
||
|
||
# Show help on nushell externs.
|
||
export def externs [
|
||
...extern: string@"nu-complete list-externs" # the name of extern to get help on
|
||
--find (-f): string # string to find in extern names
|
||
] {
|
||
let externs = (
|
||
scope commands
|
||
| where is_extern
|
||
| select name module_name description
|
||
| sort-by name
|
||
| str trim
|
||
)
|
||
|
||
if not ($find | is-empty) {
|
||
$externs | find $find --columns [name description]
|
||
} else if not ($extern | is-empty) {
|
||
let found_extern = ($externs | where name == ($extern | str join " "))
|
||
|
||
if ($found_extern | is-empty) {
|
||
extern-not-found-error (metadata $extern | get span)
|
||
}
|
||
|
||
build-extern-page ($found_extern | get 0)
|
||
} else {
|
||
$externs
|
||
}
|
||
}
|
||
|
||
def build-operator-page [operator: record] {
|
||
[
|
||
(build-help-header -n "Description")
|
||
$" ($operator.description)"
|
||
""
|
||
(build-help-header -n "Operator")
|
||
$" ($operator.name) (char lparen)(ansi cyan_bold)($operator.operator)(ansi reset)(char rparen)"
|
||
(build-help-header -n "Type")
|
||
$" ($operator.type)"
|
||
(build-help-header -n "Precedence")
|
||
$" ($operator.precedence)"
|
||
] | str join "\n"
|
||
}
|
||
|
||
# Show help on nushell operators.
|
||
#
|
||
# Examples:
|
||
# search for string in operators names
|
||
# > help operators --find Bit
|
||
# ╭───┬─────────┬──────────┬────────┬───────────────────────────────────────┬────────────╮
|
||
# │ # │ type │ operator │ name │ description │ precedence │
|
||
# ├───┼─────────┼──────────┼────────┼───────────────────────────────────────┼────────────┤
|
||
# │ 0 │ Bitwise │ bit-and │ BitAnd │ Performs a bitwise AND on two values. │ 75 │
|
||
# │ 1 │ Bitwise │ bit-or │ BitOr │ Performs a bitwise OR on two values. │ 60 │
|
||
# │ 2 │ Bitwise │ bit-xor │ BitXor │ Performs a bitwise XOR on two values. │ 70 │
|
||
# ╰───┴─────────┴──────────┴────────┴───────────────────────────────────────┴────────────╯
|
||
#
|
||
# search help for single operator
|
||
# > help operators NotRegexMatch
|
||
# Description:
|
||
# Checks if a value does not match a regular expression.
|
||
#
|
||
# Operator: NotRegexMatch (!~)
|
||
# Type: Comparison
|
||
# Precedence: 80
|
||
#
|
||
# search for an operator that does not exist
|
||
# > help operator "does not exist"
|
||
# Error:
|
||
# × std::help::operator_not_found
|
||
# ╭─[entry #21:1:1]
|
||
# 1 │ help operator "does not exist"
|
||
# · ────────┬───────
|
||
# · ╰── operator not found
|
||
# ╰────
|
||
export def operators [
|
||
...operator: string@"nu-complete list-operators" # the name of operator to get help on
|
||
--find (-f): string # string to find in operator names
|
||
] {
|
||
let operators = (get-all-operators)
|
||
|
||
if not ($find | is-empty) {
|
||
$operators | find $find --columns [type name]
|
||
} else if not ($operator | is-empty) {
|
||
let found_operator = ($operators | where name == ($operator | str join " "))
|
||
|
||
if ($found_operator | is-empty) {
|
||
operator-not-found-error (metadata $operator | get span)
|
||
}
|
||
|
||
build-operator-page ($found_operator | get 0)
|
||
} else {
|
||
$operators
|
||
}
|
||
}
|
||
|
||
def build-command-page [command: record] {
|
||
let description = (if not ($command.description? | is-empty) {[
|
||
$command.description
|
||
]} else { [] })
|
||
let extra_description = (if not ($command.extra_description? | is-empty) {[
|
||
""
|
||
$command.extra_description
|
||
]} else { [] })
|
||
|
||
let search_terms = (if not ($command.search_terms? | is-empty) {[
|
||
""
|
||
$"(build-help-header -n 'Search terms') ($command.search_terms)"
|
||
]} else { [] })
|
||
|
||
let module = (if not ($command.module_name? | is-empty) {[
|
||
""
|
||
$"(build-help-header -n 'Module') ($command.module_name)"
|
||
]} else { [] })
|
||
|
||
let category = (if not ($command.category? | is-empty) {[
|
||
""
|
||
$"(build-help-header -n 'Category') ($command.category)"
|
||
]} else { [] })
|
||
|
||
let this = ([
|
||
""
|
||
"This command:"
|
||
] | append (
|
||
if ($command.creates_scope) {
|
||
$"- (ansi cyan)does create(ansi reset) a scope."
|
||
} else {
|
||
$"- (ansi cyan)does not create(ansi reset) a scope."
|
||
}
|
||
) | append (
|
||
if ($command.type == "built-in") {
|
||
$"- (ansi cyan)is(ansi reset) a built-in command."
|
||
} else {
|
||
$"- (ansi cyan)is not(ansi reset) a built-in command."
|
||
}
|
||
) | append (
|
||
if ($command.is_sub) {
|
||
$"- (ansi cyan)is(ansi reset) a subcommand."
|
||
} else {
|
||
$"- (ansi cyan)is not(ansi reset) a subcommand."
|
||
}
|
||
) | append (
|
||
if ($command.type == "plugin") {
|
||
$"- (ansi cyan)is part(ansi reset) of a plugin."
|
||
} else {
|
||
$"- (ansi cyan)is not part(ansi reset) of a plugin."
|
||
}
|
||
) | append (
|
||
if ($command.type == "custom") {
|
||
$"- (ansi cyan)is(ansi reset) a custom command."
|
||
} else {
|
||
$"- (ansi cyan)is not(ansi reset) a custom command."
|
||
}
|
||
) | append (
|
||
if ($command.type == "keyword") {
|
||
$"- (ansi cyan)is(ansi reset) a keyword."
|
||
} else {
|
||
$"- (ansi cyan)is not(ansi reset) a keyword."
|
||
}
|
||
))
|
||
|
||
let signatures = ($command.signatures | transpose | get column1)
|
||
|
||
let cli_usage = (if not ($signatures | is-empty) {
|
||
let parameters = ($signatures | get 0 | where parameter_type != input and parameter_type != output)
|
||
|
||
let positionals = ($parameters | where parameter_type == positional and parameter_type != rest)
|
||
let flags = ($parameters | where parameter_type != positional and parameter_type != rest)
|
||
|
||
[
|
||
""
|
||
(build-help-header -n "Usage")
|
||
([
|
||
$" > ($command.name) "
|
||
(if not ($flags | is-empty) { "{flags} " } else "")
|
||
($positionals | each {|param|
|
||
$"<($param.parameter_name)> "
|
||
})
|
||
] | flatten | str join "")
|
||
""
|
||
]
|
||
} else { [] })
|
||
|
||
let subcommands = (scope commands | where name =~ $"^($command.name) " | select name description)
|
||
let subcommands = (if not ($subcommands | is-empty) {[
|
||
(build-help-header "Subcommands")
|
||
($subcommands | each {|subcommand |
|
||
$" (ansi teal)($subcommand.name)(ansi reset) - ($subcommand.description)"
|
||
} | str join "\n")
|
||
]} else { [] })
|
||
|
||
let rest = (if not ($signatures | is-empty) {
|
||
let parameters = ($signatures | get 0 | where parameter_type != input and parameter_type != output)
|
||
|
||
let positionals = ($parameters | where parameter_type == positional and parameter_type != rest)
|
||
let flags = ($parameters | where parameter_type != positional and parameter_type != rest)
|
||
let is_rest = (not ($parameters | where parameter_type == rest | is-empty))
|
||
|
||
([
|
||
""
|
||
(build-help-header "Flags")
|
||
($flags | each {|flag|
|
||
[
|
||
" ",
|
||
(if ($flag.short_flag | is-empty) { "" } else {
|
||
$"-(ansi teal)($flag.short_flag)(ansi reset), "
|
||
}),
|
||
(if ($flag.parameter_name | is-empty) { "" } else {
|
||
$"--(ansi teal)($flag.parameter_name)(ansi reset)"
|
||
}),
|
||
(if ($flag.syntax_shape | is-empty) { "" } else {
|
||
$": <(ansi light_blue)($flag.syntax_shape)(ansi reset)>"
|
||
}),
|
||
(if ($flag.description | is-empty) { "" } else {
|
||
$" - ($flag.description)"
|
||
}),
|
||
(if ($flag.parameter_default | is-empty) { "" } else {
|
||
$" \(default: ($flag.parameter_default)\)"
|
||
}),
|
||
] | str join ""
|
||
} | str join "\n")
|
||
$" (ansi teal)-h(ansi reset), --(ansi teal)help(ansi reset) - Display the help message for this command"
|
||
|
||
""
|
||
(build-help-header "Signatures")
|
||
($signatures | each {|signature|
|
||
let input = ($signature | where parameter_type == input | get 0)
|
||
let output = ($signature | where parameter_type == output | get 0)
|
||
|
||
([
|
||
$" <($input.syntax_shape)> | ($command.name)"
|
||
($positionals | each {|positional|
|
||
$" <($positional.syntax_shape)>"
|
||
})
|
||
$" -> <($output.syntax_shape)>"
|
||
] | str join "")
|
||
} | str join "\n")
|
||
|
||
(if (not ($positionals | is-empty)) or $is_rest {[
|
||
""
|
||
(build-help-header "Parameters")
|
||
($positionals | each {|positional|
|
||
([
|
||
" ",
|
||
$"(ansi teal)($positional.parameter_name)(ansi reset)",
|
||
(if ($positional.syntax_shape | is-empty) { "" } else {
|
||
$": <(ansi light_blue)($positional.syntax_shape)(ansi reset)>"
|
||
}),
|
||
(if ($positional.description | is-empty) { "" } else {
|
||
$" ($positional.description)"
|
||
}),
|
||
(if ($positional.parameter_default | is-empty) { "" } else {
|
||
$" \(optional, default: ($positional.parameter_default)\)"
|
||
})
|
||
] | str join "")
|
||
} | str join "\n")
|
||
|
||
(if $is_rest {
|
||
let rest = ($parameters | where parameter_type == rest | get 0)
|
||
$" ...(ansi teal)rest(ansi reset): <(ansi light_blue)($rest.syntax_shape)(ansi reset)> ($rest.description)"
|
||
})
|
||
]} else { [] })
|
||
] | flatten)
|
||
} else { [] })
|
||
|
||
let examples = (if not ($command.examples | is-empty) {[
|
||
""
|
||
(build-help-header -n "Examples")
|
||
($command.examples | each {|example| [
|
||
$" ($example.description)"
|
||
$" > ($example.example | nu-highlight)"
|
||
(if not ($example.result | is-empty) {
|
||
$example.result
|
||
| table -e
|
||
| to text
|
||
| if ($example.result | describe) == "binary" { str join } else { lines }
|
||
| each {|line|
|
||
$" ($line)"
|
||
}
|
||
| str join "\n"
|
||
})
|
||
""
|
||
] | str join "\n"})
|
||
] | flatten} else { [] })
|
||
|
||
[
|
||
$description
|
||
$extra_description
|
||
$search_terms
|
||
$module
|
||
$category
|
||
$this
|
||
$cli_usage
|
||
$subcommands
|
||
$rest
|
||
$examples
|
||
] | flatten | str join "\n"
|
||
}
|
||
|
||
# Show help on commands.
|
||
export def commands [
|
||
...command: string@"nu-complete list-commands" # the name of command to get help on
|
||
--find (-f): string # string to find in command names and description
|
||
] {
|
||
let commands = (scope commands | sort-by name)
|
||
|
||
if not ($find | is-empty) {
|
||
# TODO: impl find for external commands
|
||
$commands | find $find --columns [name description search_terms] | select name category description signatures search_terms
|
||
} else if not ($command | is-empty) {
|
||
let target_command = ($command | str join " ")
|
||
let found_command = ($commands | where name == $target_command)
|
||
|
||
if ($found_command | is-empty) {
|
||
try {
|
||
print $"(ansi default_italic)Help pages from external command ($target_command | pretty-cmd):(ansi reset)"
|
||
^($env.NU_HELPER? | default "man") $target_command
|
||
} catch {
|
||
command-not-found-error (metadata $command | get span)
|
||
}
|
||
}
|
||
|
||
build-command-page ($found_command | get 0)
|
||
} else {
|
||
$commands | select name category description signatures search_terms
|
||
}
|
||
}
|
||
|
||
def pretty-cmd [] {
|
||
let cmd = $in
|
||
$"(ansi default_dimmed)(ansi default_italic)($cmd)(ansi reset)"
|
||
}
|
||
|
||
# Display help information about different parts of Nushell.
|
||
#
|
||
# `help word` searches for "word" in commands, aliases and modules, in that order.
|
||
#
|
||
# Examples:
|
||
# show help for single command, alias, or module
|
||
# > help match
|
||
#
|
||
# show help for single sub-command, alias, or module
|
||
# > help str join
|
||
#
|
||
# search for string in command names, description and search terms
|
||
# > help --find char
|
||
export def main [
|
||
...item: string@"nu-complete main-help" # the name of the help item to get help on
|
||
--find (-f): string # string to find in help items names and description
|
||
] {
|
||
if ($item | is-empty) and ($find | is-empty) {
|
||
print $"Welcome to Nushell.
|
||
|
||
Here are some tips to help you get started.
|
||
* ('help -h' | pretty-cmd) or ('help help' | pretty-cmd) - show available ('help' | pretty-cmd) subcommands and examples
|
||
* ('help commands' | pretty-cmd) - list all available commands
|
||
* ('help <name>' | pretty-cmd) - display help about a particular command, alias, or module
|
||
* ('help --find <text to search>' | pretty-cmd) - search through all help commands table
|
||
|
||
Nushell works on the idea of a "(ansi default_italic)pipeline(ansi reset)". Pipelines are commands connected with the '|' character.
|
||
Each stage in the pipeline works together to load, parse, and display information to you.
|
||
|
||
(ansi green)Examples(ansi reset):
|
||
List the files in the current directory, sorted by size
|
||
> ('ls | sort-by size' | nu-highlight)
|
||
|
||
Get the current system host name
|
||
> ('sys host | get hostname' | nu-highlight)
|
||
|
||
Get the processes on your system actively using CPU
|
||
> ('ps | where cpu > 0' | nu-highlight)
|
||
|
||
You can also learn more at (ansi default_italic)(ansi light_cyan_underline)https://www.nushell.sh/book/(ansi reset)"
|
||
return
|
||
}
|
||
|
||
let target_item = ($item | str join " ")
|
||
|
||
let commands = (try { commands $target_item --find $find })
|
||
if not ($commands | is-empty) { return $commands }
|
||
|
||
let aliases = (try { aliases $target_item --find $find })
|
||
if not ($aliases | is-empty) { return $aliases }
|
||
|
||
let modules = (try { modules $target_item --find $find })
|
||
if not ($modules | is-empty) { return $modules }
|
||
|
||
if ($find | is-not-empty) {
|
||
print -e $"No help results found mentioning: ($find)"
|
||
return []
|
||
}
|
||
|
||
let span = (metadata $item | get span)
|
||
error make {
|
||
msg: ("std::help::item_not_found" | error-fmt)
|
||
label: {
|
||
text: "item not found"
|
||
span: $span
|
||
}
|
||
}
|
||
}
|