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|  | Predicate git_ls_remote/3 | 
git ls-remote against the remote repository to fetch
references from the remote. Options processed:
heads(Boolean)tags(Boolean)refs(List)
For example, to find the hash of the remote HEAD, one can use
?- git_ls_remote('git://www.swi-prolog.org/home/pl/git/pl-devel.git',
                 Refs, [refs(['HEAD'])]).
Refs = ['5d596c52aa969d88e7959f86327f5c7ff23695f3'-'HEAD'].
| Refs | - is a list of pairs hash-name. |