I am not particularly satisfied how the viper mode works in Emacs. I am trying to write my own viper mode. I do not have any good programming experience in Elisp except for the number of customizations I have done using the .emacs file.
I would like to know if I can change the key-bindings in Emacs temporarily and return them back to their original state as and when needed.
Well if I understand your question correctly one easy way to do this would be to create your own minor mode (in addition to your own specific mode I'd say), made only of your temporary key-bindings.
You give a name to that mode and then toggling all your temporary key-bindings on or off becomes as simple as calling your command:
M-x salsabear-minor-mode
You probably want to read scottfrazer's 45+ upvotes answer here on SO:
Globally override key binding in Emacs
where he explains how to create your own minor-mode containing your key-bindings.
Given that you explicitly only mention viper, it's probably worth asking whether you're aware of the other vi/vim-based libraries which exist? See the list under:
http://www.emacswiki.org/emacs/CategoryEmulation
I would suspect that re-inventing this particular wheel is probably not worthwhile.
I believe that Evil is the most active project, but if it doesn't work the way you want, your efforts might be better-spent enhancing that (if practical)?
Related
(update: a valid answer can include "there is no neat/automated way of doing this) I've been keeping myself busy with other things but if I know there is no neat way of doing what is requested below then I'll just get started on finding some manual way as much as possible.
I have been looking online for a way to ensure all my emac buffers use the same keybindings. However I use exwm & certain applications such as libreoffice have their own keybindings which take precedence over emacs keybindings. Is there some code I can use to make all emacs default keybindings take precedence over any other application?
A specific example is this situation:
I want to be able to use the default bindings to change which buffer I am using position wise. I do this using (windmove-default-keybindings) however when I switch to an application like libreoffice writer, that application makes it so S-arrowkey doesn't move my active buffer anymore (libreoffice takes over that keybinding). I wish for windmove to still control what S-arrow key does.
In general this means I want emacs to be the only application in control of any keybinding. Is the only way to do this is to set each keybinding as global manually? and will a global keybinding take precedence over applications like libreoffice?
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I am about to learn Emacs, have been through the tutorial and borrowed the O'Reilly book on Emacs. But the question still is - how do you learn good Emacs workflow? I guess, you don't use Emacs as you'd use, for example, Vim.
This question seems revelant to mine:
- Where can I find a video of a professional using Emacs?
I can't believe nobody has mentioned this, but reading the info pages bundled with Emacs is a great way to learn about obscure features. Whenever you need a break from coding, hit M-x info and pick a random page to read. Your emacs ability will improve incredibly quickly.
It is also important to realize how emacs' self-documenting-ness helps you work. Say, for example, you are wondering how you can scale the font size. Instead of interrupting your flow and asking here, or on IRC, or Google, you can ask emacs! Just hit C-h a (M-x command-apropos) and type a search term, in our case scale. If there are matching functions, their names, keybindings, and documentation will appear. There are, and now you've just discovered text-scale-increase and text-scale-decrease.
There are other self-documentation functions that are good to learn C-h m will tell you what keybindings and commands are available in the current major and minor modes. This is a great way to discover features you didn't know existed.
Another way to "learn by osmosis" is to M-x customize-group for the modes you use regularly. (customize is the interactive configuration editor that almost all modes support.)
The final thing to do is to learn Emacs Lisp. It is nice to use existing tools, but sometimes you will need your own. If you try to avoid learning Lisp, you will always be stuck with things not quite working right, and that's a shame.
Emacs is a great environment for customizing itself. Emacs includes two Lisp manuals that are viewable via M-x info. It is self-documenting, so you can say C-h f or M-x describe-function to get the documentation for any function. You can even press TAB ENT to jump to the source code of that function, to see how it's implemented. This is great when you think "I wish I had something that worked like foo, but just slightly different." You can read how foo is implemented, make your change in the *scratch* buffer, and then see if you like the change. There is no edit/compile/test cycle. You press a key and your emacs session immediately has the feature you just wrote.
The more effort you put into learning emacs, the more emacs will do to make your work easier.
Once you mastered the basics (opening/closing files, navigating, basic editing) just use it. As with a lot of other tools, practise makes perfect...
I would, however, set some time aside to work on improving how you use the editor currently, but as part of your normal workflow as opposed to just going off on a tangent and learning things for the sake of it.
I find some useful resources are the EmacsWiki and the Planet Emacsen blog. I use both, mainly by using Planet Emacsen for "inspiration" and then wandering over to EmacsWiki and having a trawl on there for a specific topic. I found that unless you're having at least a vague idea what you're looking for, the available information is just going to swamp you instead of it actually being helpful.
Not to mention that there are a few very useful resources here on StackOverflow, for example this question here. Emacs is a very powerful tool that tends to be able to do a lot more than a single person needs, but in the end that allows you to pick and choose exactly those parts that you need.
My suggestion is just stop using anything but Emacs, when you come across a problem see if you can solve it in Emacs, and then fall back (if you don't have the time or it just won't work). As for work flow, it is pretty much the same as you would normally work. i.e. for a normal ide session you would open/edit a file as normal, then commit (in C-x v v) just as normal.
I agree with the other posters here, you just have to use it! Here's how I did it:
Once I got the very basics (can get between buffers, open/save files, etc), I printed out a reference card and kept it handy. This is a good one. Review it just so you know what is on it, then whenever you find yourself doing something repeatedly that is on the card, start using the shortcut! Before you know it you'll have memorized quite an arsenal of commands. But remember, probably no one uses everything that emacs can do.
When you eventually find yourself doing something repeatedly that doesn't have a shortcut, that's a good time to learn keyboard macros. Once you get them, you'll find uses for them everywhere! From there it's a short jump to writing elisp (if you're a programmer).
The great thing about emacs is that you don't need an "emacs workflow", emacs works around your workflow!
You don't need to learn emacs workflow. Once you complete the tutorial and master the essentials, you'll have to adopt some degree of monogamy and use nothing but Emacs. Eventually you will think of functionality that you really wished existed; most of the time somebody else will have as well and the solution is just one search away! Over time you just can't help but learn and eventually you'll pick up enough that you'll develop your own personal workflow.
If you're looking to accelerate the process, the Emacs wiki has a variety of tips but really the best way is just to do stuff with Emacs.
You could have a look at Bram Molenaar's talk about efficient textediting, http://video.google.com/videoplay?docid=2538831956647446078&ei=EqiGSau8KZ-QiQLi-Nn8Cg&q=bram+molenaar+editing
Although he's a vim guy (he wrote it), you might get some ideas about how best to go about becoming more proficient with your text editor that'll apply to emacs.
To be honest, all I do is learn the keybindings I need. I don't use emacs to its full potential, because I don't need its full potential. My suggestion is to just learn what you need, and don't worry about what you don't. Learn a new key binding everyday, and in about 300 years will you know them all ;)
I am using the emacs since the old Amiga days on all platforms i am currently working on.
The best way to use emacs is curiosity. I still use often apropos (C-h a) and M-x (for a long functionname instead of key-binding) to find a functionality.
a key-concept to "proper use" Emacs is, to learn the very easy elisp (a simple derivate of lisp) and write your own little helpers (own commenting style, underlining, templates) and to know where to look to change values (tab-size, compiler, email)
And the third thing: everything is in emacs: I use the dired (directory editor) for navigating through files. I use a lot of buffers for all textual files (with proper modes for each type of file (c, ruby, list, sql, latex, ...)) which are stored when quitting emacs and recovered when invoking. I start the compiler from emacs and use the jump-to-error-functionality.
Macros are a daily routine (scimming throu code and changing it on the way).
I like the picture-mode, which allows to type downward with replacing, which makes it easy to renumber block of constants (good old c #defines))
There is a hugh mountain to climb, but if you have reached the top, you can see the whole world down your feet, and never want to miss this experience again. I know, there are many good editors around (i work myself thru Eclipse)
As previously stated, the best advice is to use nothing but Emacs for the next year. Once you develop your finger memory, things get to be much easier.
How do you learn a "good workflow" for anything? By using it, getting to know it, making it yours. There is no "proper" use of Emacs.
As for getting to know it: ask Emacs -- use its help system. This can help too: http://www.emacswiki.org/emacs/EmacsNewbieWithIcicles
That's the power of Emacs, you use it the way you like. You just have to configure it before for your liking.
I need to implement some new functions on an editor. I picked Emacs - although my main programming knowledge is in Java and C - and I want to add some functions and edit some existing functions of Emacs Editor. I looked at the source code of it and I'm a bit lost. I was wondering whether anyone can give me some advice about where to start and whether there are any tutorials that can help?
P.S. One specific question would be how one can start to write a new mode with all new features and behaviour? or how I can disable some basic functions like copy/paste?
Cheers
An Introduction to Programming in Emacs Lisp http://www.gnu.org/software/emacs/emacs-lisp-intro/ or type in emacs:
M-: (info "(eintr)Top") RET
Emacs Lisp Manual http://www.gnu.org/software/emacs/manual/elisp.html or type in emacs:
M-: (info "(elisp)Top") RET
There are some tutorials out there specifically geared towards writing a major mode.
emacs extension guide [pdf]
how to write a major mode...
Other than that, writing modes in Emacs is just writing Lisp functions.
One thing I will note is that what you're proposing to do here may be pointless; if you implement a permission system as a major mode, a user can simply switch modes to turn it off. That's fine if the point of this permission system is to avoid clobbering edits (in which case I assume your users will cooperate with your aims). If you're expecting your users to be adversarial, then Emacs is the wrong tool for this.
Here is the manual section on defining major and minor modes:
C-hig (elisp) Modes RET
It is often beneficial to derive a new mode from an existing one which provides similar basic functionality to what you need.
If there's nothing which matches closely enough, examining the source code for modes which provide some of the same behaviour would be the next best thing.
I note that 'deriving' a mode from nil seems to be the common way of creating a completely new major mode. That way you still get all the benefits of the define-derived-mode macro.
I'm trying to figure out if there's a way to reset the keymap so that I can manually enable features with an appropriate keybinding. I'm trying to do a customized Emacs build and would like full control over the keybindings and features enabled.
Edit: Thanks for the answers, this answered what I was looking for perfectly. I was trying to Google it and I couldn't find much but now I'm starting to understand Emacs more.
Basically I'm trying to learn it and customize the keybindings to my preferences. Though I have had trouble overriding some keybindings but the suggestions of disabling major mode was what I was looking for.
Well, Emacs will give you full control, there are a couple different ways to accomplish what it sounds like you're trying to do. To be successful though, I recommend you read and understand the Keymaps section of the manual. If your customized Emacs build uses any major or minor modes, you'll have to do special work to disable/override any keymaps they set.
Of particular interest are the sections Creating Keymaps, Active Keymaps, Controlling Active Maps, and ... pretty much the whole chapter.
I recommend starting with creating a basic keymap and overriding the global keymap with yours. That'd be a good start. Probably the easiest way would be to do something like:
(setq global-map (make-keymap))
(global-set-key ...)
Though, you're also going to have to disable the major modes from setting up their keys, the easiest way would be to disable automatic choosing of major modes by doing this:
(setq auto-mode-alist nil)
Read the section on How Emacs Chooses a Major Mode.
The question needs more detail to enable writing a more detailed answer...
You may bundle the features into a minor-mode with its own keymap. When the minor-mode is enabled, its keymap will be consulted before the global-map, overriding the latter in effect. When disabled, the default key bindings in the global-map will be visible again.
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I am about to learn Emacs, have been through the tutorial and borrowed the O'Reilly book on Emacs. But the question still is - how do you learn good Emacs workflow? I guess, you don't use Emacs as you'd use, for example, Vim.
This question seems revelant to mine:
- Where can I find a video of a professional using Emacs?
I can't believe nobody has mentioned this, but reading the info pages bundled with Emacs is a great way to learn about obscure features. Whenever you need a break from coding, hit M-x info and pick a random page to read. Your emacs ability will improve incredibly quickly.
It is also important to realize how emacs' self-documenting-ness helps you work. Say, for example, you are wondering how you can scale the font size. Instead of interrupting your flow and asking here, or on IRC, or Google, you can ask emacs! Just hit C-h a (M-x command-apropos) and type a search term, in our case scale. If there are matching functions, their names, keybindings, and documentation will appear. There are, and now you've just discovered text-scale-increase and text-scale-decrease.
There are other self-documentation functions that are good to learn C-h m will tell you what keybindings and commands are available in the current major and minor modes. This is a great way to discover features you didn't know existed.
Another way to "learn by osmosis" is to M-x customize-group for the modes you use regularly. (customize is the interactive configuration editor that almost all modes support.)
The final thing to do is to learn Emacs Lisp. It is nice to use existing tools, but sometimes you will need your own. If you try to avoid learning Lisp, you will always be stuck with things not quite working right, and that's a shame.
Emacs is a great environment for customizing itself. Emacs includes two Lisp manuals that are viewable via M-x info. It is self-documenting, so you can say C-h f or M-x describe-function to get the documentation for any function. You can even press TAB ENT to jump to the source code of that function, to see how it's implemented. This is great when you think "I wish I had something that worked like foo, but just slightly different." You can read how foo is implemented, make your change in the *scratch* buffer, and then see if you like the change. There is no edit/compile/test cycle. You press a key and your emacs session immediately has the feature you just wrote.
The more effort you put into learning emacs, the more emacs will do to make your work easier.
Once you mastered the basics (opening/closing files, navigating, basic editing) just use it. As with a lot of other tools, practise makes perfect...
I would, however, set some time aside to work on improving how you use the editor currently, but as part of your normal workflow as opposed to just going off on a tangent and learning things for the sake of it.
I find some useful resources are the EmacsWiki and the Planet Emacsen blog. I use both, mainly by using Planet Emacsen for "inspiration" and then wandering over to EmacsWiki and having a trawl on there for a specific topic. I found that unless you're having at least a vague idea what you're looking for, the available information is just going to swamp you instead of it actually being helpful.
Not to mention that there are a few very useful resources here on StackOverflow, for example this question here. Emacs is a very powerful tool that tends to be able to do a lot more than a single person needs, but in the end that allows you to pick and choose exactly those parts that you need.
My suggestion is just stop using anything but Emacs, when you come across a problem see if you can solve it in Emacs, and then fall back (if you don't have the time or it just won't work). As for work flow, it is pretty much the same as you would normally work. i.e. for a normal ide session you would open/edit a file as normal, then commit (in C-x v v) just as normal.
I agree with the other posters here, you just have to use it! Here's how I did it:
Once I got the very basics (can get between buffers, open/save files, etc), I printed out a reference card and kept it handy. This is a good one. Review it just so you know what is on it, then whenever you find yourself doing something repeatedly that is on the card, start using the shortcut! Before you know it you'll have memorized quite an arsenal of commands. But remember, probably no one uses everything that emacs can do.
When you eventually find yourself doing something repeatedly that doesn't have a shortcut, that's a good time to learn keyboard macros. Once you get them, you'll find uses for them everywhere! From there it's a short jump to writing elisp (if you're a programmer).
The great thing about emacs is that you don't need an "emacs workflow", emacs works around your workflow!
You don't need to learn emacs workflow. Once you complete the tutorial and master the essentials, you'll have to adopt some degree of monogamy and use nothing but Emacs. Eventually you will think of functionality that you really wished existed; most of the time somebody else will have as well and the solution is just one search away! Over time you just can't help but learn and eventually you'll pick up enough that you'll develop your own personal workflow.
If you're looking to accelerate the process, the Emacs wiki has a variety of tips but really the best way is just to do stuff with Emacs.
You could have a look at Bram Molenaar's talk about efficient textediting, http://video.google.com/videoplay?docid=2538831956647446078&ei=EqiGSau8KZ-QiQLi-Nn8Cg&q=bram+molenaar+editing
Although he's a vim guy (he wrote it), you might get some ideas about how best to go about becoming more proficient with your text editor that'll apply to emacs.
To be honest, all I do is learn the keybindings I need. I don't use emacs to its full potential, because I don't need its full potential. My suggestion is to just learn what you need, and don't worry about what you don't. Learn a new key binding everyday, and in about 300 years will you know them all ;)
I am using the emacs since the old Amiga days on all platforms i am currently working on.
The best way to use emacs is curiosity. I still use often apropos (C-h a) and M-x (for a long functionname instead of key-binding) to find a functionality.
a key-concept to "proper use" Emacs is, to learn the very easy elisp (a simple derivate of lisp) and write your own little helpers (own commenting style, underlining, templates) and to know where to look to change values (tab-size, compiler, email)
And the third thing: everything is in emacs: I use the dired (directory editor) for navigating through files. I use a lot of buffers for all textual files (with proper modes for each type of file (c, ruby, list, sql, latex, ...)) which are stored when quitting emacs and recovered when invoking. I start the compiler from emacs and use the jump-to-error-functionality.
Macros are a daily routine (scimming throu code and changing it on the way).
I like the picture-mode, which allows to type downward with replacing, which makes it easy to renumber block of constants (good old c #defines))
There is a hugh mountain to climb, but if you have reached the top, you can see the whole world down your feet, and never want to miss this experience again. I know, there are many good editors around (i work myself thru Eclipse)
As previously stated, the best advice is to use nothing but Emacs for the next year. Once you develop your finger memory, things get to be much easier.
How do you learn a "good workflow" for anything? By using it, getting to know it, making it yours. There is no "proper" use of Emacs.
As for getting to know it: ask Emacs -- use its help system. This can help too: http://www.emacswiki.org/emacs/EmacsNewbieWithIcicles
That's the power of Emacs, you use it the way you like. You just have to configure it before for your liking.