B00_vcs.HgSourceval get_cmd :
?search:B0_std.Fpath.t list ->
?cmd:B0_std.Cmd.t ->
unit ->
(B0_std.Cmd.t, string) Stdlib.resultget_cmd () looks for hg with B0_std.Os.Cmd.get.
find ~dir () finds, using VCS functionality, an hg repository starting in directory dir (if unspecified this is the cwd).