Emacs/emacs/Hideshow

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26.7 Hideshow minor mode

Hideshow mode is a buffer-local minor mode that allows you to selectively display portions of a program, which are referred to as blocks. Type M-x hs-minor-mode to toggle this minor mode (see Minor Modes).

When you use Hideshow mode to hide a block, the block disappears from the screen, to be replaced by an ellipsis (three periods in a row). Just what constitutes a block depends on the major mode. In C mode and related modes, blocks are delimited by braces, while in Lisp mode they are delimited by parentheses. Multi-line comments also count as blocks.

Hideshow mode provides the following commands:

C-c @ C-h

C-c @ C-d

Hide the current block (hs-hide-block).
C-c @ C-s
Show the current block (hs-show-block).
C-c @ C-c

C-c @ C-e

Either hide or show the current block (hs-toggle-hiding).
S-mouse-2
Toggle hiding for the block you click on (hs-mouse-toggle-hiding).
C-c @ C-M-h

C-c @ C-t

Hide all top-level blocks (hs-hide-all).
C-c @ C-M-s

C-c @ C-a

Show all blocks in the buffer (hs-show-all).
C-u n C-c @ C-l
Hide all blocks n levels below this block (hs-hide-level).

These variables can be used to customize Hideshow mode:

hs-hide-comments-when-hiding-all
If non-nil, C-c @ C-M-h (hs-hide-all) hides comments too.
hs-isearch-open
This variable specifies the conditions under which incremental search should unhide a hidden block when matching text occurs within the block. Its value should be either code (unhide only code blocks), comment (unhide only comments), t (unhide both code blocks and comments), or nil (unhide neither code blocks nor comments). The default value is code.

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