dropbox_dir: Function to list contents of a Dropbox folder.
In karthik/rDrop: Dropbox R interface.

Description Usage Arguments Value Examples

If no folder is specifies, it will only list contents of the root folder.

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  dropbox_dir(cred, path = NULL, verbose = FALSE,
    deleted = FALSE, pattern = NULL,
    curl = getCurlHandle(), ...)

`cred`	An object of class DropboxCredentials with Dropobox specific credentials.
`path`	The directory to list. Not yet implemented
`verbose`	logical. FALSE returns a list with file names in root folder. TRUE returns a `data.frame` with the following fields: id, revision, rev, thumb_exists, bytes, path, modified, and is_dir
`deleted`	logical. Default is FALSE. Set to TRUE to also list deleted files.
`pattern`	an optional regular expression. Only file names which match the regular expression will be returned.
`curl`	If using in a loop, call getCurlHandle() first and pass the returned value in here (avoids unnecessary footprint)
`...`	optional additional curl options (debugging tools mostly).

directory listing with file or folder names unless verbose = TRUE in which case a data.frame is returned.

## Not run: 
dropbox_dir(db_cred)
dropbox_dir(db_cred, path='/specific_folder')
dropbox_dir(db_cred,path='/specific_folder', verbose = TRUE)
dropbox_dir(db_cred,path='/specific_folder', pattern='file', verbose = TRUE)
returns a dataframe with fields .id, revision, rev, thumb_exists, bytes, modified path, is_dir, icon, root, size, client_mtime, mimetype.

## End(Not run)