Make --format=list work with commands such as core-status

[greg-1-anderson]

This is related to #130.

Works:

$ drush status 'Drupal root' --format=list

Does not work:

$ drush status --fields=root --format=list

These should be the same. The first works, because it first filters the result rows down to just one consisting of a simple string. The second fails, because it attempts to validate to output from the status command first, and finds values that are arrays. The key-value format flattens these arrays into space-delimited strings, whereas the 'list' format does not support this.

[weitzman]

This is fixed now?

[greg-1-anderson]

Nope. --list is still failing if the command output contains any values that are not simple strings. key-value handles this by imploding the array. This issue is to unify the implementation of the list and key-value output formats, so they behave the same. I think the other issue can be committed, though, as this is kind of an edge case.

[greg-1-anderson]

Drush 9 and the output formatters project does this correctly. Closing.