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The other special commands of outline mode are used to make lines visible
or invisible. Their names all start with hide or show.
Most of them fall into pairs of opposites. They are not undoable; instead,
you can undo right past them. Making lines visible or invisible is simply
not recorded by the undo mechanism.
hide-body).
show-all).
hide-subtree).
show-subtree).
hide-leaves).
show-branches).
show-children).
hide-entry).
show-entry).
hide-sublevels).
hide-other).
Two commands that are exact opposites are C-c C-c
(hide-entry) and C-c C-e (show-entry). They are
used with point on a heading line, and apply only to the body lines of
that heading. Subheadings and their bodies are not affected.
Two more powerful opposites are C-c C-d (hide-subtree) and
C-c C-s (show-subtree). Both expect to be used when point is
on a heading line, and both apply to all the lines of that heading's
subtree: its body, all its subheadings, both direct and indirect, and
all of their bodies. In other words, the subtree contains everything
following this heading line, up to and not including the next heading of
the same or higher rank.
Intermediate between a visible subtree and an invisible one is having
all the subheadings visible but none of the body. There are two
commands for doing this, depending on whether you want to hide the
bodies or make the subheadings visible. They are C-c C-l
(hide-leaves) and C-c C-k (show-branches).
A little weaker than show-branches is C-c C-i
(show-children). It makes just the direct subheadings
visible--those one level down. Deeper subheadings remain invisible, if
they were invisible.
Two commands have a blanket effect on the whole file. C-c C-t
(hide-body) makes all body lines invisible, so that you see just
the outline structure. C-c C-a (show-all) makes all lines
visible. These commands can be thought of as a pair of opposites even
though C-c C-a applies to more than just body lines.
The command C-c C-q (hide-sublevels) hides all but the
top level headings. With a numeric argument n, it hides everything
except the top n levels of heading lines.
The command C-c C-o (hide-other) hides everything except
the heading or body text that point is in, plus its parents (the headers
leading up from there to top level in the outline).
You can turn off the use of ellipses at the ends of visible lines by
setting selective-display-ellipses to nil. Then there is
no visible indication of the presence of invisible lines.
When incremental search finds text that is hidden by Outline mode, it makes that part of the buffer visible. If you exit the search at that position, the text remains visible.
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