heads

With no arguments, show all open branch heads in the repository.
Branch heads are changesets that have no descendants on the
same branch. They are where development generally takes place and
are the usual targets for update and merge operations.

If one or more REVs are given, only open branch heads on the
branches associated with the specified changesets are shown. This
means that you can use :hg:`heads .` to see the heads on the
currently checked-out branch.

If -c/--closed is specified, also show branch heads marked closed
(see :hg:`commit --close-branch`).

If STARTREV is specified, only those heads that are descendants of
STARTREV will be displayed.

If -t/--topo is specified, named branch mechanics will be ignored and only
topological heads (changesets with no children) will be shown.

Returns 0 if matching heads are found, 1 if not.
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