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122 lines
5.0 KiB
Plaintext
122 lines
5.0 KiB
Plaintext
# Convert a Nushell value to a list
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#
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# Primary useful for range-to-list, but other types are accepted as well.
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#
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# Example:
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#
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# 1..10 | into list
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export def "into list" []: any -> list {
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let input = $in
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let type = ($input | describe --detailed | get type)
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match $type {
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range => {$input | each {||}}
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list => $input
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table => $input
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_ => [ $input ]
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}
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}
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# Convert a list of columns into a table
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#
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# Examples:
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#
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# [
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# ([ 1 2 3 ] | wrap a)
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# ([ 4 5 6 ] | wrap b)
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# ([ 7 8 9 ] | wrap c)
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# ] | columns-into-table
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# => ╭───┬───┬───┬───╮
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# => │ # │ a │ b │ c │
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# => ├───┼───┼───┼───┤
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# => │ 0 │ 1 │ 4 │ 7 │
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# => │ 1 │ 2 │ 5 │ 8 │
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# => │ 2 │ 3 │ 6 │ 9 │
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# => ╰───┴───┴───┴───╯
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#
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# Can roundtrip with `table-into-columns`
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#
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# ls | table-into-columns | columns-into-table
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# => ╭───┬────────────────────────┬──────┬────────┬────────────────╮
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# => │ # │ name │ type │ size │ modified │
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# => ├───┼────────────────────────┼──────┼────────┼────────────────┤
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# => │ 0 │ into-list.nu │ file │ 378 B │ 40 minutes ago │
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# => │ 1 │ mod.nu │ file │ 28 B │ 41 minutes ago │
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# => │ 2 │ name-values.nu │ file │ 394 B │ 34 minutes ago │
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# => │ 3 │ record-into-columns.nu │ file │ 1.3 kB │ 27 minutes ago │
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# => ╰───┴────────────────────────┴──────┴────────┴────────────────╯
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export def columns-into-table []: [list<table> -> table] {
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reduce {|it| merge $it}
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}
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# Convert a record, where each value is a list, into a list of columns.
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# { a: [ 1 2 3 ], b: [ 4 5 6 ] } | record-into-columns
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# => ╭───┬───────────╮
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# => │ 0 │ ╭───┬───╮ │
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# => │ │ │ # │ a │ │
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# => │ │ ├───┼───┤ │
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# => │ │ │ 0 │ 1 │ │
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# => │ │ │ 1 │ 2 │ │
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# => │ │ │ 2 │ 3 │ │
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# => │ │ ╰───┴───╯ │
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# => │ 1 │ ╭───┬───╮ │
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# => │ │ │ # │ b │ │
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# => │ │ ├───┼───┤ │
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# => │ │ │ 0 │ 4 │ │
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# => │ │ │ 1 │ 5 │ │
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# => │ │ │ 2 │ 6 │ │
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# => │ │ ╰───┴───╯ │
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# => ╰───┴───────────╯
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# =>
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# This can be especially useful when combined with `columns-into-table`, as in:
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#
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# { a: [ 1 2 3 ], b: [ 4 5 6 ] } | record-into-columns
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# | columns-into-table
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# => ╭───┬───┬───╮
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# => │ # │ a │ b │
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# => ├───┼───┼───┤
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# => │ 0 │ 1 │ 4 │
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# => │ 1 │ 2 │ 5 │
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# => │ 2 │ 3 │ 6 │
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# => ╰───┴───┴───╯
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# =>
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export def record-into-columns []: [record -> list] {
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items {|key, val| $val | wrap $key}
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}
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# Convert/split a table into a list of columns
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#
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# Examples:
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# ls | table-into-columns
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# => Returns a list of 4 tables, one for each of the `ls` columns
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#
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# Can be roundtripped with `columns-into-table`
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#
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# ls | table-into-columns | columns-into-table
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# => ╭───┬────────────────────────┬──────┬────────┬────────────────╮
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# => │ # │ name │ type │ size │ modified │
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# => ├───┼────────────────────────┼──────┼────────┼────────────────┤
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# => │ 0 │ into-list.nu │ file │ 378 B │ 40 minutes ago │
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# => │ 1 │ mod.nu │ file │ 28 B │ 41 minutes ago │
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# => │ 2 │ name-values.nu │ file │ 394 B │ 34 minutes ago │
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# => │ 3 │ record-into-columns.nu │ file │ 1.3 kB │ 27 minutes ago │
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# => ╰───┴────────────────────────┴──────┴────────┴────────────────╯
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export def table-into-columns []: [table -> list<table>] {
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let IN = $in
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$IN | columns | each {|col| $IN | select $col}
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}
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# Assign keynames to a list of values, effectively converting the list to a record.
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#
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# Example:
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#
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# [ 1 2 3 ] | name-values a b c
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# => ╭───┬───╮
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# => │ a │ 1 │
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# => │ b │ 2 │
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# => │ c │ 3 │
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# => ╰───┴───╯
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export def name-values [...names: string]: [list -> record] {
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let IN = $in
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0.. | zip $IN | into record | rename ...$names
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}
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