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Showing content from http://www.gnu.org/software/emacs/manual/html_node/emacs/Outline-Mode.html below:

Outline Mode (GNU Emacs Manual)

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27.9 Outline Mode

Outline mode is a major mode derived from Text mode, which is specialized for editing outlines. It provides commands to navigate between entries in the outline structure, and commands to make parts of a buffer temporarily invisible, so that the outline structure may be more easily viewed. Type M-x outline-mode to switch to Outline mode. Entering Outline mode runs the hook text-mode-hook followed by the hook outline-mode-hook (see Hooks).

When you use an Outline mode command to make a line invisible (see Outline Visibility Commands), the line disappears from the screen. An ellipsis (three periods in a row) is displayed at the end of the previous visible line, to indicate the hidden text. Multiple consecutive invisible lines produce just one ellipsis.

Editing commands that operate on lines, such as C-n and C-p, treat the text of the invisible line as part of the previous visible line. Killing the ellipsis at the end of a visible line really kills all the following invisible text associated with the ellipsis.


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