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Add 'every' command to select (or skip) every nth row (#1992)

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* Add 'every' command

* Add --skip option to 'every' command

This option skips instead of selects every nth row

* Fix descriptions for 'every' command

* Add docummentation for 'every' command

* Check actual filenames in 'every' command tests
This commit is contained in:
Jakub Žádník
2020-06-16 22:58:41 +03:00
committed by GitHub
parent eb1ada6115
commit 3d63901b3b
6 changed files with 400 additions and 0 deletions
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# every
Selects every n-th row of a table, starting from the first one. With the `--skip` flag, every n-th row will be skipped, inverting the original functionality.
Syntax: `> [input-command] | every <stride> {flags}`
## Flags
* `--skip`, `-s`: Skip the rows that would be returned, instead of selecting them
## Examples
```shell
> open contacts.csv
───┬─────────┬──────┬─────────────────
# │ first │ last │ email
───┼─────────┼──────┼─────────────────
0 │ John │ Doe │ doe.1@email.com
1 │ Jane │ Doe │ doe.2@email.com
2 │ Chris │ Doe │ doe.3@email.com
3 │ Francis │ Doe │ doe.4@email.com
4 │ Stella │ Doe │ doe.5@email.com
───┴─────────┴──────┴─────────────────
```
```shell
> open contacts.csv | every 2
───┬─────────┬──────┬─────────────────
# │ first │ last │ email
───┼─────────┼──────┼─────────────────
0 │ John │ Doe │ doe.1@email.com
2 │ Chris │ Doe │ doe.3@email.com
4 │ Stella │ Doe │ doe.5@email.com
───┴─────────┴──────┴─────────────────
```
```shell
> open contacts.csv | every 2 --skip
───┬─────────┬──────┬─────────────────
# │ first │ last │ email
───┼─────────┼──────┼─────────────────
1 │ Jane │ Doe │ doe.2@email.com
3 │ Francis │ Doe │ doe.4@email.com
───┴─────────┴──────┴─────────────────
```