[1.0] Delete files matching prefix

[nicolasmure]

Currently, we can't delete folders (only files one by one), and it is a required feature ( #182 , #524 ).

Proposal

After a discussion with @NiR- , here is what came out :

There are two functions which are used to get the file list managed by the adapter :

• keys
• listKeys (only for the ListKeysAware adapters)
  The listKeys function can have a $prefix argument who will return only the files having this prefix in their path.

The folder removal function should also have a prefix argument which will be the folder to delete.
Also, it would be good to remove the keys function and to rename the listKeys function to keys and to keep its optional prefix parameter. The implementation should also be moved from the FileSystem to the adapters themselves.

Todo

• Filesystem
• Adapter (interface)
• AwsS3
• AzureBlobStorage
• DoctrineDbal
• Flysystem
• Ftp
• GridFs
• Local (started by Fix directory deletion #526 )
• OpenCloud
• PhpseclibSftp
• SafeLocal
• Zip

[akerouanton]

To give more background: we're going to move from filesystem abstraction to object storage abstraction, thus directory concept is neither needed nor advisable.