Re:Readline in Vim's Insert Mode
by randomanybody on Saturday December 05, 2015 @04:49PM
(#10683391)
have you ever found a solution to make readline change cursor shape depending on mode? not knowing the mode before typing keeps me from turning this on, even though I prefer vi bindings.
You can do something similar using the show-mode-in-prompt option:
show-mode-in-prompt
If set to `on', add a character to the beginning of the prompt indicating
the editing mode: emacs (`@'), vi command (`:'), or vi insertion (`+').
The default value is `off'.
Chet accepted a patch I submitted for custom indicators, and this will be coming in bash 4.4/readline 7.0: http://thread.gmane.org/gmane.comp.shells.bash.bugs/22580/fo...
I have patched versions of bash 4.3/readline 6.3 available on github (the bash page has gifs showing the functionality in action): https://github.com/calid/bash https://github.com/calid/readline
Note that the '\m' escape hasn't been accepted into the mainline yet, so as of now the custom indicators will still only display at the beginning of the prompt in the new versions.
Honestly, I've never looked. Although it seems some terminals can change the cursor shape, it looks like even Vim doesn't bother to try, so I'd be surprised if readline could.
The general solution is to just tap Esc a couple of times to ensure you're in Normal mode and continue from there.
You were doing it right the first time. Vim's "insert mode special keys" are basically incredibly basic terminal controls that are the same as Readline anyway (like backspace, or ^U to delete to the beginning of the line), or incredibly obscure things like inserting the contents of a specific register. Vim doesn't expect you to move the cursor much in insert mode, it's just for typing.
As it turns out, the extra Readline bindings this emulates are basically emulating Emacs' standard bindings, so if you want those bindings in an editor, you know where to look.
Personally, I just stick these settings in ~/.inputrc:
...and then every application that uses Readline (including bash, the Python REPL, the PostgreSQL REPL, and a bunch of other things) defaults to vi keybindings. It's dreamy.