nushell/crates/nu-command
Darren Schroeder 4ae53d93fb
new command: into value (#10427)
# Description

This new command `into value` is a command that tries to infer the type
of data you have in a table. It converts each cell to a string and then
runs a set of regular expressions on that string. This was mostly
cobbled together after looking at how polars does similar things. The
regular expressions were taken straight form polars and tweaked.

### Before
```nushell
❯ [[col1 col2 col3 col4 col5 col6]; ["1" "two" "3.4" "true" "2023-08-10 14:07:17.922050800 -05:00" "2023-09-19"]] |
  update col1 {|r| $r.col1 | into int } |
  update col3 {|r| $r.col3 | into float } |
  update col4 {|r| $r.col4 | into bool } |
  update col5 {|r| $r.col5 | into datetime } |
  update col6 {|r| $r.col6 | into datetime }
╭#┬col1┬col2┬col3┬col4┬───col5────┬───col6────╮
│0│   1│two │3.40│true│a month ago│8 hours ago│
╰─┴────┴────┴────┴────┴───────────┴───────────╯
```
or
```nushell
❯ [[col1 col2 col3 col4 col5 col6]; ["1" "two" "3.4" "true" "2023-08-10 14:07:17.922050800 -05:00" "2023-09-19"]] |
  into int col1 |
  into float col3 |
  into bool col4 |
  into datetime col5 col6
╭#┬col1┬col2┬col3┬col4┬───col5────┬───col6────╮
│0│   1│two │3.40│true│a month ago│8 hours ago│
╰─┴────┴────┴────┴────┴───────────┴───────────╯
```

### After
```nushell
❯ [[col1 col2 col3 col4 col5 col6]; ["1" "two" "3.4" "true" "2023-08-10 14:07:17.922050800 -05:00" "2023-09-19"]] | into value
╭#┬col1┬col2┬col3┬col4┬───col5────┬───col6────╮
│0│   1│two │3.40│true│a month ago│8 hours ago│
╰─┴────┴────┴────┴────┴───────────┴───────────╯
```

It's definitely not perfect. There are ways it will fail because on
regular expressions not working on all formats. My hope is that people
will pick this up and add more regular expressions and if there are
problems with the existing ones, change them. This is meant as a
"starter command" with easy entry for newcomers that are looking to chip
in and help out.

Also, some tests probably need to be added to ensure what we have now
doesn't break with updates.

# User-Facing Changes
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# Tests + Formatting
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2023-09-20 12:57:58 -05:00
..
src new command: into value (#10427) 2023-09-20 12:57:58 -05:00
tests allow values command to support LazyRecords (#10418) 2023-09-20 12:57:29 -05:00
Cargo.toml new command: into value (#10427) 2023-09-20 12:57:58 -05:00
LICENSE Fix rest of license year ranges (#8727) 2023-04-04 09:03:29 +12:00