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I'm trying to make it easier to refactor stuff by running a single command that "performs the last rename interactively".

I have a binding for doing this that sort of works, but I'm curious whether there's a way to prevent it from ever getting "out of sync" by replacing an old substitution with a recent edit.

so far the best I've been able to find is this, which clobbers a register and a marker and the user to manually "wrap" commands so that they populate the contents of the p register. It's also very easy for <leader>, to pick up a new edit and there's absolutely no indication that this has happened. 

nnoremap ciw mP"pyiw`Pciw

nnoremap <silent> <leader>, :%s/<c-r>p/<c-r>./gc<cr>

I'd like to be able to start with a file that looks like this:

AAAA       (instant 1)
AAAA
AAAA
AAAA

run the following commands gg0ciwBBBBBBB<esc>, get the following buffer

BBBBBBB    (instant 2)
AAAA
AAAA
AAAA

since ciw has been remapped, running <leader>, causes the buffer to look like this

BBBBBBB    (instant 3)
BBBBBBB
BBBBBBB
BBBBBBB

This is correct behavior. If, however, I performed I inserted and then deleted some text after (instant 2). By performing 0ia<esc> and then x

aBBBBBBB    (instant 2.1 -- alternate)
AAAA
AAAA
AAAA

BBBBBBB     (instant 2.2 -- alternate)
AAAA
AAAA
AAAA

then performing <leader>, will result in the following buffer

BBBBBBB     (instant 3 -- alternate)
a
a
a

the correct identifier AAAA was targeted, but the contents of the . register has changed. I'd like a solution where performing a mismatched substitution is simply impossible.

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    What about a mapping like nnoremap {key} :%s/<c-r><c-w>//gc<left><left><left>? maybe add <c-f> to bring up the command-line window? Would that be sufficient? – Peter Rincker Mar 21 '19 at 17:21
  • The thing I'm trying to do is repeat a pseudo-substitution performed by ciw + entering text as an action that targets the substituted text. Ideally what I'd like to do is set up ciw in such a way that the subsequent edit is stored in a particular register (say o) so p and o are always in sync. – Gregory Nisbet Mar 21 '19 at 17:29
  • You provided example of what happens. You also need to provide examples of what you want to happen. – klaus Mar 21 '19 at 17:45
  • @Klaus ... what happens is what I want to happen. It's just that the way that I implemented it is not robust since it will apply whatever text was inserted last and it's inappropriate for a plugin because it claims at least one register. I added an example showing my partial solution's drawbacks. – Gregory Nisbet Mar 21 '19 at 17:48
  • Okay. That makes sense. But I don't understand what you actually want to do. As far as I can understand, you want to change all instances of a word. Oh I get it, you used the term refactoring. Like you already have a source file with a variable name which you want to change, but change for the whole file. But you don't want to do it with a single :%s substitution. In other words, you want to make it interactive. I'm guessing you are writing a plugin. I don't have any idea though. You should look at established plugins that use this type of features. – klaus Mar 21 '19 at 17:55
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You can use InsertLeave to capture @@ and @. then use those values in your substitution mapping.

nnoremap <expr> ciw <SID>replacer()
nnoremap gs :<c-u>%s/<c-r>=get(g:, 'replacer_pat')<cr>/<c-r>=get(g:, 'replacer_str')<cr>/gc

function s:replacer()
  augroup replacer
    autocmd!
    autocmd InsertLeave * execute "autocmd! replacer" |
          \ let [g:replacer_pat, g:replacer_str] = [getreg(v:register), @.]
  augroup END
  return 'ciw'
endfunction

Note: InsertLeave will not fire if you use <c-c>. It might also act incorrectly when using <c-o>.

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1

I recently added this little snippet to my vimrc, which accomplishes a similar but different effect:

nnoremap <Leader>cw :let @/=expand('<cword>')<CR>cgn

With this, I can do <Leader>cw, insert some text, and use n to go to instances of the old name and . to instantly change the next one wherever it is (see :help gn). This provides me with a selective renaming tool.

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