From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Drew Adams Newsgroups: gmane.emacs.help Subject: RE: [External] : What is the difference between (deactivate-mark) and (setq deactivate-mark t)? 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envelope-from=drew.adams@oracle.com; helo=userp2130.oracle.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:128830 Archived-At: > Well, I understand what each of them does, but whay was the variable > introduced and why would I want to say `(setq deactivate-mark t)' in > a command instead of just calling `(deactivate-mark)'? I can't think of > any possible reasons. Any ideas? I may be repeating what you say you already understand, but... Function `deactivate-mark' deactivates the mark (duh), and it does so right away. After a command finishes and returns, the command loop normally automatically deactivates the mark. IOW, for the next command the mark is inactive. But if you set variable `deactivate-mark' to `nil' in your command then the command loop won't deactivate it when your command is done. As the manual says: To write Lisp code that modifies the buffer without causing deactivation of the mark at the end of the command, bind 'deactivate-mark' to 'nil' around the code that does the modification. For example: (let (deactivate-mark) (insert " ")) Setting the variable to nil says do NOT deactivate the mark. See (elisp) `The Mark'. https://www.gnu.org/software/emacs/manual/html_node/elisp/The-Mark.html