From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rainer M Krug Subject: Re: Keyboard shortcut - is there a principle behind them? Date: Fri, 06 Dec 2013 11:01:24 +0100 Message-ID: <52A1A074.9090601@krugs.de> References: <52A192A9.9000202@krugs.de> Reply-To: Rainer@krugs.de Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ess-help-bounces@r-project.org Sender: ess-help-bounces@r-project.org To: Oleh Cc: emacs-orgmode , "ess-help@r-project.org" List-Id: emacs-orgmode.gnu.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/06/13, 10:49 , Oleh wrote: > Initially the shortcuts were mnemonic, e.g. C-e: > `move-end-of-line'. Obviously the keys ran out pretty quick. I can really imagine. But this explains some - but following your example: C-a moves to the beginning of the line - the only "a" there is in "Anfang", which is German for "beginning". So only partial luck here. > Now only few shortcuts are reserved for user space and plugins, the > most notable of which is the `C-c` prefix. That's why most custom > modes such as org-mode and ESS bind to shortcuts with `C-c` prefix: > there's a convention that Emacs core will not use `C-c`. Ah - very good to know. > > A nice way of remembering shortcuts only when you need them is to > call commands by name with `M-x`. After a while, when you note that > you're using one particular command a lot, you'll want to learn the > shortcut for it. That's how I do it - but it involves learning sequences which do not make any sense to me - and I am sure there is some sense in the sequence, at least within each mode. > > There's one package that might be of good use to you: `smex'. It > uses ido completion for `M-x`. You can install it from > MELPA/Marmelade. It binds automatically to `M-x` when you install, > although I recommend: (global-set-key "\C-t" 'smex) Yes - smex and ido are *very* useful - I do not know how one can use emacs without them. > > As an example, say you want to tangle. Here's what you do: C-t > tang Now you see a bunch of rectangle commands mixed into the > bunch. You can filter them out by noting that tangle commands have > `org` in their name. C-SPC org C-SPC Now there's only 7 candidates > left and you can select the one you want with C-m either by cycling > with C-s or continuing to type part of name. > > `smex` logs the commands you use most. For them it usually takes > less than 2-3 characters from the name to be recognized. E.g. if > you use `org-babel-tangle` a lot, you can usually call it with C-t > bab C-m. Very true and very useful. > > Finally note that no shortcuts are set in stone. You can customize > all of them if you want to do so. For instance, and probably a lot > of people will disagree, it doesn't make sense for me to have > `previous-line' on C-p. So I swap C-p and C-h: (keyboard-translate > ?\C-h ?\C-p) (keyboard-translate ?\C-p ?\C-h) Absolutely true - but I usually try to keep the customization to a minimum and to use the defaults. Thanks, Rainer > > Oleh > > > On Fri, Dec 6, 2013 at 10:02 AM, Rainer M Krug > wrote: Hi > > one alternative subject could be "because it is Friday"... > > I am using org-mode and ess regularly, and I use quite a few > keyboard shortcuts, but each time I read about a new one, I am > wondering: why the heck these specific (default!) keyboard > shortcuts? > > I am not asking why keyboard sequence, but e.g. why "export" in org > is C-c e and why tangle is C-c C-v t, and so on. > > In other words: I am trying to *understand* why C-c and not C-o, > because I have tremendous problems to remember the shortcuts - if > I would know that there is s tree structure, where each following > key narrows it down to further *thematically linked* commands, it > would make it easier to learn these. > > Any insight into this? Or is there a emacs function which returns > a random keyboard shortcut for a given function (some emacs > shortcuts really seem to be that way...). > > Thanks, > > Rainer > > >> - -- Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Stellenbosch University South Africa Tel : +33 - (0)9 53 10 27 44 Cell: +33 - (0)6 85 62 59 98 Fax : +33 - (0)9 58 10 27 44 Fax (D): +49 - (0)3 21 21 25 22 44 email: Rainer@krugs.de Skype: RMkrug -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.22 (Darwin) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSoaB0AAoJENvXNx4PUvmColIIAIy4AQTri6yZ6wVh8hp3/5gV RnY8oAXfHTBGW136AwXe2H9fMwfuyc+UA6rqcGzKMx0L1SCdNBXpK3Tfn2gFjRph iP/0TEqZgTXIwJurmn33yG6h9a0ABmEXVky+jOkHouldhjt7uuUyvT0LqmYw9pPs NFQAU1zmVFgh/nEiJvP2VKilXPh+NXo6ulPjhtAIDb/KjGLTy0SkPJYAF6Do4WYY wgbh+GCDzEWKgM+zQfzTq1CydX9FUdWw/zdbULhfu+f+J3/dZWtAlMfSsPi8N38g tAVJA/ycKqIMX3/GPlN7FlscPIdYnHxvJRo45MP/3mxkiI5B5vTn9sG90/J1dwU= =p6dh -----END PGP SIGNATURE----- ______________________________________________ ESS-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/ess-help