branch: elpa/evil-emacs-cursor-model-mode
commit d2efaa27d54abc5b38c788a01ca485ed66c0c628
Author: maxfriis <[email protected]>
Commit: GitHub <[email protected]>
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README.org | 178 ++++++++++++++++++++++++++
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diff --git a/README.org b/README.org
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+#+title: Evil Emacs cursor model mode
+#+startup: showall hideblocks
+#+options: toc:nil num:1
+
+This is a mode for using Emacs' cursor between characters model in evil-mode's
normal-state.
+
+** License
+
+Creative Commons Attribution-ShareAlike 4.0 International License\\
+[[https://creativecommons.org/licenses/by-sa/4.0/]]
+
+Supposedly this is convertible to GPL 3.
+
+*** Thanks
+
+Toby Cubitt coded the cursor model.\\
+[[https://www.dr-qubit.org/Evil_cursor_model.html]]
+
+*** Install
+
+Download evil-emacs-cursor-model-mode.el, open and install it with
(package-install-from-buffer).
+Add the following code to your init.el:
+#+begin_src emacs-lisp
+ (require 'evil-emacs-cursor-model-mode)
+ (evil-emacs-cursor-model-mode 1)
+#+end_src
+
+** Cursor models
+
+Vim works with two cursor models.
+A cursor /on/ characters model in normal-state and /between/ characters in
insert-state.
+The evil-emacs-cursor-model-mode unify these to a cursor between model in both
states.
+
+Furthermore it becomes natural to change some keybindings in this framework.
+That is my sacrilege to "the church of Vim".
+Evil-mode's modal interface is preserved.
+
+** Keybindings
+
+Even though or maybe because I come from the Emacs world, I don't like layers.
+=<shift>= just like =<ctrl>= is a layer and I try to minimize the use of them
in keybindings.
+To do this the mode will change three keybindings in Vim's normal-state keys.
+
+*** The =a= binding
+
+First and foremost Vim's =a= in normal-state makes little sense.
+With this mode (evil-append) is just move forward (=l=) and enter insert-state
(=i=).
+That is how you think if you adopt the mode's cursor model.
+
+Therefore I bind evil-mode's (evil-append-line) to =a=.
+
+Binding (evil-append-line) makes sense in a cursor between model, whereas
(evil-append) does not.
+
+*** The =p= and =o= bindings
+
+With the change to =a= it is natural to have a look at =p= too.
+When you are not pasting a full line Vim's =p= makes little sense in this mode.
+Move forward and paste is strange to prioritize with a one letter lower case
binding.
+
+Therefore I swap evil-mode's =p= and =P=.
+
+When you use the mode, you might find yourself only using one paste command.
+Vim's need for two paste commands is compensation for the normal-state cursor
model.
+Other editors usually only have one paste command and it's also natural to
mainly have one in this mode.
+The new =P= is still bound and can be useful, but you can contextually replace
it with =jp= or =lp=.
+
+Last I swap Vim's =o= and =O= so their case are consistent with =p= and =P=
when you paste lines.
+
+*** Summary
+
+This is all normal-state bindings:
+
+| This mode's binding | Vim's binding | Alternative | Lisp function
|
+|---------------------+---------------+-------------------+---------------------|
+| =a= | =A= | =$i= | (evil-append-line)
|
+| =o= | =O= | | (evil-open-above)
|
+| =O= | =o= | =jo= and =a<RET>= | (evil-open-below)
|
+| =p= | =P= | |
(evil-paste-before) |
+| =P= | =p= | =jp= or =lp= | (evil-paste-after)
|
+
+Besides that the mode manipulate motions so the cursor between characters
model will work.
+E.g. =E= should bring you to the end of a word rather than between the last
two characters of a word.
+These manipulations all work seamlessly and should feel natural.
+
+** The idea of a line nugget
+
+One idea of the mode is to reduce the use of layers and bindings.
+When all the commands operating on other lines are layered, you might start to
adopt a new philosophy.
+The idea is to work with motions among line nuggets.
+
+Vim already does this somewhat, since most commands are limited to operating
on the current line.
+I like all my keybindings dealing with the current line to be lower case.
+Remaining upper case bindings can be replaced by using a motion (e.g. =I= is
=0i=).
+
+With this mode you can embrace the line nugget idea and replace layers with
motions.
+If you want to open the next line you can use =jo= or =a<RET>= which are both
two key presses, but so are the new =<shift>o=.
+Same works for paste where =jp= can replace the new =P=, when you paste a line.
+
+The mindset is that you are working on the current line.
+This work is more efficient when the keybindings are lower case.
+I feel this logic is easier to comprehend and internalize if you are not a
power user.
+
+*** Efficiency
+
+Compared to Vim the efficiency is roughly the same with this mode.
+If you need to work with the next line you will need weakly more keys.
+When dealing with the current line nugget you might need fewer.
+
+In most situations you will probably solve whatever you want to do, with
roughly the same number of keys.
+Over time you will develop muscle memory, which make you end up in the right
place for using fewer key strokes.
+
+Using a layer increase complexity because it does not only require that you
use two keys.
+It also adds a restriction on holding down a key while pressing other keys.
+The following is not fair, but I find it harder to write "hEll" than "hello".
+
+Ultimately the modal framework is about editing text (working with the current
line nugget) rather than adding new text (working with additional lines).
+
+** Drawbacks
+
+The main drawback is that it will be harder to work efficiently with an
unconfigured Vi, Vim or evil-mode editor.
+The former mentioned muscle memory will work against you.
+
+This is often mentioned as an advantage of Vim over Emacs.
+Everyone personalize Emacs' default keybindings.
+You are more likely to have Vim's default keybindings available, if you sit
down with someone else's Vim box.
+
+*** Combined command and motion
+
+The mode does have things that become less natural or harder.
+In Vim you can artificially mimic =l= with =a<esc>=.
+This type of behavior where you have an implicit motion might feel unnatural
in this mode.
+That is a real cost, since a combined command and motion can sometimes be
utilized with a prefix.
+
+*** Swap characters
+
+A more useful application of the command/motion behavior is Vim's =xp= which
/swap/ two characters and move the cursor forward.
+The lisp function (transpose-chars) does roughly the same thing without
involving the kill ring.
+I bind it to =gs= in my init.el, but this is not a part of the mode.
+#+begin_src emacs-lisp
+ (bind-keys
+ :map evil-normal-state-map
+ ("gs" . transpose-chars))
+#+end_src
+Vim's default =gs= is (sit-for 1) but evil-mode doesn't implement it.
+
+Note that Vim's behavior is often available so e.g. =~= will work on the
(char-after) and move forward.
+It might feel a bit less natural in this mode but it still works.
+
+*** Touching delimiters
+
+If you have touching delimiters like "(...)(...)" and your cursor is between
them, then =%= will jump back to the first "(".
+In this mode there is no way to toggle back and forth between the second set
of delimiters when the two sets are touching.
+
+*** Visual block
+
+Last the mode does nothing to =C-v= which is still working with a cursor on
character model.
+In practice =C-v= is still usable and useful but it will have a few bugs tied
to the end of line position.
+
+Note that the evil team has done a great job on (evil-visual-block).
+Vanilla Emacs' (rectangle-mark-mode) =C-x <spc>= does not color the region the
same way.
+Updating =C-v= to be consistent with this mode's cursor model is a challenge.
+
+** Raison d'être speculation
+
+I think the main advantage of the mode is the line nugget mindset.
+If you don't use your editor every day I think this is easier to pick up and
more similar to other editing experiences.
+That is the personal preference I have.
+
+The reason for the mode might also be as an introduction to Vim's modal system.
+It is hard to start out with Vim in it's unfamiliar cursor model.
+Maybe this mode will make it an easier and better experience to pick up the
modal framework.
+
+The mode might be helpful if you suffer from a hand injury.
+Emacs pinky is a real thing and layers can be a problem.
+Even a small relief in the amount of layers might be important.
+
+Last the mode might be helpful to people who use accessibility help.
+The mode will reduce the need for "sticky keys".
