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standard library: implement help commands with $nu (#8505)
This commit is contained in:
Antoine Stevan
GitHub
parent
d93953a56f
commit
d06ebb1686
@ -710,3 +710,721 @@ export def clip [
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notify-send "std clip" "saved to clipboard"
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}
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}
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def error-fmt [] {
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$"(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
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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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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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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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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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def print-help-header [
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text: string
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--no-newline (-n): bool
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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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print -n $header
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} else {
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print $header
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}
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}
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def show-module [module: record] {
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if not ($module.usage? | is-empty) {
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print $module.usage
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print ""
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}
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print-help-header -n "Module"
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print $" ($module.name)"
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print ""
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if not ($module.commands? | is-empty) {
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print-help-header "Exported commands"
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print -n " "
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let commands_string = (
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$module.commands
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| 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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print $commands_string
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print ""
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}
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if not ($module.aliases? | is-empty) {
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print-help-header -n "Exported aliases:"
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print $module.aliases
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print ""
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}
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if ($module.env_block? | is-empty) {
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print $"This module (ansi cyan)does not export(ansi reset) environment."
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} else {
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print $"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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}
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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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# > let-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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# > let-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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# > let-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 │ usage │
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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 │ usage │
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# ├───┼──────┼─────────────┼────────────────┼──────────────┼───────────────┤
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# │ 0 │ bar │ ╭───┬─────╮ │ [list 0 items] │ <Block 1331> │ my bar module │
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# │ │ │ │ 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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# let-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 "help modules" [
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...module: string # 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 = ($nu.scope.modules | sort-by name)
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let module = ($module | str join " ")
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if not ($find | is-empty) {
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let found_modules = ($modules | find $find)
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if ($found_modules | length) == 1 {
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show-module ($found_modules | get 0)
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} else {
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$found_modules
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}
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} else if not ($module | is-empty) {
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let found_module = ($modules | where name == $module)
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if ($found_module | is-empty) {
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module_not_found_error (metadata $module | get span)
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}
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show-module ($found_module | get 0)
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} else {
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$modules
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}
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}
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def show-alias [alias: record] {
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if not ($alias.usage? | is-empty) {
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print $alias.usage
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print ""
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}
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print-help-header -n "Alias"
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print $" ($alias.name)"
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print ""
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print-help-header "Expansion"
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print $" ($alias.expansion)"
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}
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# Show help on nushell aliases.
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#
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# Examples:
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# > let us define a bunch of aliases
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# > ```nushell
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# > # my foo alias
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# > old-alias foo = echo "this is foo"
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# >
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# > # my bar alias
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# > old-alias bar = echo "this is bar"
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# >
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# > # my baz alias
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# > old-alias baz = echo "this is baz"
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# >
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# > # a multiline alias
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# > old-alias multi = echo "this
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# > is
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# > a
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# > multiline
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# > string"
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# > ```
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#
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# show all aliases
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# > help aliases
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# ╭───┬───────┬────────────────────┬───────────────────╮
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# │ # │ name │ expansion │ usage │
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# ├───┼───────┼────────────────────┼───────────────────┤
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# │ 0 │ bar │ echo "this is bar" │ my bar alias │
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# │ 1 │ baz │ echo "this is baz" │ my baz alias │
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# │ 2 │ foo │ echo "this is foo" │ my foo alias │
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# │ 3 │ multi │ echo "this │ a multiline alias │
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# │ │ │ is │ │
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# │ │ │ a │ │
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# │ │ │ multiline │ │
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# │ │ │ string" │ │
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# ╰───┴───────┴────────────────────┴───────────────────╯
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#
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# search for string in alias names
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# > help aliases --find ba
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# ╭───┬──────┬────────────────────┬──────────────╮
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# │ # │ name │ expansion │ usage │
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# ├───┼──────┼────────────────────┼──────────────┤
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# │ 0 │ bar │ echo "this is bar" │ my bar alias │
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# │ 1 │ baz │ echo "this is baz" │ my baz alias │
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# ╰───┴──────┴────────────────────┴──────────────╯
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#
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# search help for single alias
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# > help aliases multi
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# a multiline alias
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#
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# Alias: multi
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#
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# Expansion:
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# echo "this
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# is
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# a
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# multiline
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# string"
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#
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# search for an alias that does not exist
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# > help aliases "does not exist"
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# Error:
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# × std::help::alias_not_found
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# ╭─[entry #21:1:1]
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# 1 │ help aliases "does not exist"
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# · ────────┬───────
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# · ╰── alias not found
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# ╰────
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export def "help aliases" [
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...alias: string # the name of alias to get help on
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--find (-f): string # string to find in alias names
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] {
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let aliases = ($nu.scope.aliases | sort-by name)
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let alias = ($alias | str join " ")
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if not ($find | is-empty) {
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let found_aliases = ($aliases | find $find)
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if ($found_aliases | length) == 1 {
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show-alias ($found_aliases | get 0)
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} else {
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$found_aliases
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}
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} else if not ($alias | is-empty) {
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let found_alias = ($aliases | where name == $alias)
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if ($found_alias | is-empty) {
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alias-not-found-error (metadata $alias | get span)
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}
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show-alias ($found_alias | get 0)
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} else {
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$aliases
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}
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}
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def show-extern [extern: record] {
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if not ($extern.usage? | is-empty) {
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print $extern.usage
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print ""
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}
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print-help-header -n "Extern"
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print $" ($extern.name)"
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}
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# Show help on nushell externs.
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export def "help externs" [
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...extern: string # the name of extern to get help on
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--find (-f): string # string to find in extern names
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] {
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let externs = (
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$nu.scope.commands
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| where is_extern
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| select name module_name usage
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| sort-by name
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| str trim
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)
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let extern = ($extern | str join " ")
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if not ($find | is-empty) {
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let found_externs = ($externs | find $find)
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if ($found_externs | length) == 1 {
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show-extern ($found_externs | get 0)
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} else {
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$found_externs
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}
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} else if not ($extern | is-empty) {
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let found_extern = ($externs | where name == $extern)
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if ($found_extern | is-empty) {
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extern-not-found-error (metadata $extern | get span)
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}
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show-extern ($found_extern | get 0)
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} else {
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$externs
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}
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}
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def show-operator [operator: record] {
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print-help-header "Description"
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print $" ($operator.description)"
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print ""
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print-help-header -n "Operator"
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print ($" ($operator.name) (char lparen)(ansi cyan_bold)($operator.operator)(ansi reset)(char rparen)")
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print-help-header -n "Type"
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print $" ($operator.type)"
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print-help-header -n "Precedence"
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print $" ($operator.precedence)"
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}
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# Show help on nushell operators.
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#
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# Examples:
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# search for string in operators names
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# > help operators --find Bit
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# ╭───┬─────────┬──────────┬────────┬───────────────────────────────────────┬────────────╮
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# │ # │ type │ operator │ name │ description │ precedence │
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# ├───┼─────────┼──────────┼────────┼───────────────────────────────────────┼────────────┤
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# │ 0 │ Bitwise │ bit-and │ BitAnd │ Performs a bitwise AND on two values. │ 75 │
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# │ 1 │ Bitwise │ bit-or │ BitOr │ Performs a bitwise OR on two values. │ 60 │
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# │ 2 │ Bitwise │ bit-xor │ BitXor │ Performs a bitwise XOR on two values. │ 70 │
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# ╰───┴─────────┴──────────┴────────┴───────────────────────────────────────┴────────────╯
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#
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# search help for single operator
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# > help operators NotRegexMatch
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# Description:
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# Checks if a value does not match a regular expression.
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#
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# Operator: NotRegexMatch (!~)
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# Type: Comparison
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# Precedence: 80
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#
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# search for an operator that does not exist
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# > help operator "does not exist"
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# Error:
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# × std::help::operator_not_found
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# ╭─[entry #21:1:1]
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# 1 │ help operator "does not exist"
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# · ────────┬───────
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# · ╰── operator not found
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# ╰────
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export def "help operators" [
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...operator: string # the name of operator to get help on
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--find (-f): string # string to find in operator names
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] {
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let operators = ([
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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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] | sort-by name)
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let operator = ($operator | str join " ")
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if not ($find | is-empty) {
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let found_operators = ($operators | find $find)
|
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|
||||
if ($found_operators | length) == 1 {
|
||||
show-operator ($found_operators | get 0)
|
||||
} else {
|
||||
$found_operators
|
||||
}
|
||||
} else if not ($operator | is-empty) {
|
||||
let found_operator = ($operators | where name == $operator)
|
||||
|
||||
if ($found_operator | is-empty) {
|
||||
operator-not-found-error (metadata $operator | get span)
|
||||
}
|
||||
|
||||
show-operator ($found_operator | get 0)
|
||||
} else {
|
||||
$operators
|
||||
}
|
||||
}
|
||||
|
||||
def show-command [command: record] {
|
||||
if not ($command.usage? | is-empty) {
|
||||
print $command.usage
|
||||
}
|
||||
if not ($command.extra_usage? | is-empty) {
|
||||
print ""
|
||||
print $command.extra_usage
|
||||
}
|
||||
|
||||
if not ($command.search_terms? | is-empty) {
|
||||
print ""
|
||||
print-help-header -n "Search terms"
|
||||
print $" ($command.search_terms)"
|
||||
}
|
||||
|
||||
if not ($command.module_name? | is-empty) {
|
||||
print ""
|
||||
print-help-header -n "Module"
|
||||
print $" ($command.module_name)"
|
||||
}
|
||||
|
||||
if not ($command.category? | is-empty) {
|
||||
print ""
|
||||
print-help-header -n "Category"
|
||||
print $" ($command.category)"
|
||||
}
|
||||
|
||||
print ""
|
||||
print "This command:"
|
||||
if ($command.creates_scope) {
|
||||
print $"- (ansi cyan)does create(ansi reset) a scope."
|
||||
} else {
|
||||
print $"- (ansi cyan)does not create(ansi reset) a scope."
|
||||
}
|
||||
if ($command.is_builtin) {
|
||||
print $"- (ansi cyan)is(ansi reset) a built-in command."
|
||||
} else {
|
||||
print $"- (ansi cyan)is not(ansi reset) a built-in command."
|
||||
}
|
||||
if ($command.is_sub) {
|
||||
print $"- (ansi cyan)is(ansi reset) a subcommand."
|
||||
} else {
|
||||
print $"- (ansi cyan)is not(ansi reset) a subcommand."
|
||||
}
|
||||
if ($command.is_plugin) {
|
||||
print $"- (ansi cyan)is part(ansi reset) of a plugin."
|
||||
} else {
|
||||
print $"- (ansi cyan)is not part(ansi reset) of a plugin."
|
||||
}
|
||||
if ($command.is_custom) {
|
||||
print $"- (ansi cyan)is(ansi reset) a custom command."
|
||||
} else {
|
||||
print $"- (ansi cyan)is not(ansi reset) a custom command."
|
||||
}
|
||||
if ($command.is_keyword) {
|
||||
print $"- (ansi cyan)is(ansi reset) a keyword."
|
||||
} else {
|
||||
print $"- (ansi cyan)is not(ansi reset) a keyword."
|
||||
}
|
||||
|
||||
let signatures = ($command.signatures | transpose | get column1)
|
||||
|
||||
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)
|
||||
|
||||
print ""
|
||||
print-help-header "Usage"
|
||||
print -n " > "
|
||||
print -n $"($command.name) "
|
||||
if not ($flags | is-empty) {
|
||||
print -n $"{flags} "
|
||||
}
|
||||
for param in $positionals {
|
||||
print -n $"<($param.parameter_name)> "
|
||||
}
|
||||
print ""
|
||||
}
|
||||
|
||||
let subcommands = ($nu.scope.commands | where name =~ $"^($command.name) " | select name usage)
|
||||
if not ($subcommands | is-empty) {
|
||||
print ""
|
||||
print-help-header "Subcommands"
|
||||
for subcommand in $subcommands {
|
||||
print $" (ansi teal)($subcommand.name)(ansi reset) - ($subcommand.usage)"
|
||||
}
|
||||
}
|
||||
|
||||
if not ($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 = ($parameters | where parameter_type != positional and parameter_type != rest)
|
||||
let is_rest = (not ($parameters | where parameter_type == rest | is-empty))
|
||||
|
||||
print ""
|
||||
print-help-header "Flags"
|
||||
print $" (ansi teal)-h(ansi reset), (ansi teal)--help(ansi reset) - Display the help message for this command"
|
||||
for flag in $flags {
|
||||
print -n $" (ansi teal)-($flag.short_flag)(ansi reset), (ansi teal)--($flag.parameter_name)(ansi reset)"
|
||||
if not ($flag.syntax_shape | is-empty) {
|
||||
print -n $" <(ansi light_blue)($flag.syntax_shape)(ansi reset)>"
|
||||
}
|
||||
print $" - ($flag.description)"
|
||||
}
|
||||
|
||||
print ""
|
||||
print-help-header "Signatures"
|
||||
for signature in $signatures {
|
||||
let input = ($signature | where parameter_type == input | get 0)
|
||||
let output = ($signature | where parameter_type == output | get 0)
|
||||
|
||||
print -n $" <($input.syntax_shape)> | ($command.name)"
|
||||
for positional in $positionals {
|
||||
print -n $" <($positional.syntax_shape)>"
|
||||
}
|
||||
print $" -> <($output.syntax_shape)>"
|
||||
}
|
||||
|
||||
if (not ($positionals | is-empty)) or $is_rest {
|
||||
print ""
|
||||
print-help-header "Parameters"
|
||||
for positional in $positionals {
|
||||
print -n " "
|
||||
if ($positional.is_optional) {
|
||||
print -n "(optional) "
|
||||
}
|
||||
print $"(ansi teal)($positional.parameter_name)(ansi reset) <(ansi light_blue)($positional.syntax_shape)(ansi reset)>: ($positional.description)"
|
||||
}
|
||||
|
||||
if $is_rest {
|
||||
let rest = ($parameters | where parameter_type == rest | get 0)
|
||||
print $" ...(ansi teal)rest(ansi reset) <(ansi light_blue)($rest.syntax_shape)(ansi reset)>: ($rest.description)"
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if not ($command.examples | is-empty) {
|
||||
print ""
|
||||
print-help-header -n "Examples"
|
||||
for example in $command.examples {
|
||||
print ""
|
||||
print $" ($example.description)"
|
||||
print $" > ($example.example | nu-highlight)"
|
||||
if not ($example.result | is-empty) {
|
||||
for line in (
|
||||
$example.result | table | if ($example.result | describe) == "binary" { str join } else { lines }
|
||||
) {
|
||||
print $" ($line)"
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
print ""
|
||||
}
|
||||
|
||||
# Show help on nushell commands.
|
||||
export def "help commands" [
|
||||
...command: string # the name of command to get help on
|
||||
--find (-f): string # string to find in command names and usage
|
||||
] {
|
||||
let commands = ($nu.scope.commands | where not is_extern | reject is_extern | sort-by name)
|
||||
|
||||
let command = ($command | str join " ")
|
||||
|
||||
if not ($find | is-empty) {
|
||||
let found_commands = ($commands | find $find)
|
||||
|
||||
if ($found_commands | length) == 1 {
|
||||
show-command ($found_commands | get 0)
|
||||
} else {
|
||||
$found_commands | select name category usage signatures search_terms
|
||||
}
|
||||
} else if not ($command | is-empty) {
|
||||
let found_command = ($commands | where name == $command)
|
||||
|
||||
if ($found_command | is-empty) {
|
||||
command-not-found-error (metadata $command | get span)
|
||||
}
|
||||
|
||||
show-command ($found_command | get 0)
|
||||
} else {
|
||||
$commands | select name category usage 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 lpad
|
||||
#
|
||||
# search for string in command names, usage and search terms
|
||||
# > help --find char
|
||||
export def help [
|
||||
...item: string # the name of the help item to get help on
|
||||
--find (-f): string # string to find in help items names and usage
|
||||
] {
|
||||
if ($item | is-empty) and ($find | is-empty) {
|
||||
print $"Welcome to Nushell.
|
||||
|
||||
Here are some tips to help you get started.
|
||||
* ('help -h' | pretty-cmd) or ('help help' | pretty-cmd) - show available ('help' | pretty-cmd) subcommands and examples
|
||||
* ('help commands' | pretty-cmd) - list all available commands
|
||||
* ('help <name>' | pretty-cmd) - display help about a particular command, alias, or module
|
||||
* ('help --find <text to search>' | pretty-cmd) - search through all help commands table
|
||||
|
||||
Nushell works on the idea of a "(ansi default_italic)pipeline(ansi reset)". Pipelines are commands connected with the '|' character.
|
||||
Each stage in the pipeline works together to load, parse, and display information to you.
|
||||
|
||||
(ansi green)Examples(ansi reset):
|
||||
List the files in the current directory, sorted by size
|
||||
> ('ls | sort-by size' | nu-highlight)
|
||||
|
||||
Get information about the current system
|
||||
> ('sys | get host' | nu-highlight)
|
||||
|
||||
Get the processes on your system actively using CPU
|
||||
> ('ps | where cpu > 0' | nu-highlight)
|
||||
|
||||
You can also learn more at (ansi default_italic)(ansi light_cyan_underline)https://www.nushell.sh/book/(ansi reset)"
|
||||
return
|
||||
}
|
||||
|
||||
let item = ($item | str join " ")
|
||||
|
||||
let commands = (try { help commands $item --find $find })
|
||||
if not ($commands | is-empty) { return $commands }
|
||||
|
||||
let aliases = (try { help aliases $item --find $find })
|
||||
if not ($aliases | is-empty) { return $aliases }
|
||||
|
||||
let modules = (try { help modules $item --find $find })
|
||||
if not ($modules | is-empty) { return $modules }
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user