From 0fa3cc1dbf47935dbab9f1251a8960a1b516d8d6 Mon Sep 17 00:00:00 2001
From: Josh Rahm <rahm@google.com>
Date: Fri, 4 Apr 2025 18:10:18 +0000
Subject: Change how substitute works again.

This time, it's using TextChanged and CursorMoved hooks to determine
what the word was before and after a text change occured. This makes it
much cleaner and doesn't rely on remapping anything.
---
 plugin/substitute.vim | 59 +++++++++++++++------------------------------------
 1 file changed, 17 insertions(+), 42 deletions(-)

diff --git a/plugin/substitute.vim b/plugin/substitute.vim
index f06afb9..82afab9 100644
--- a/plugin/substitute.vim
+++ b/plugin/substitute.vim
@@ -1,14 +1,10 @@
-
-" gs will create a substitution command to replace the last yanked string with
-" the last inserted string over a motion.
-"
-" This is useful when renaming a variable for example, one can place the cursor
-" over the varibale to rename and type:
+" gs will propegate a change made to a <cword> over a text object. This is done
+" by the plugin taking note of the word under the cursor before a text change is
+" made and what the word was changed to after the text was changed, and gs will
+" create a substitute command based on that and apply it to a text object.
 "
-" ciwnew_variable_name<esc>gsiB
-"
-" and this will replace that variable name with 'new_variable_name' inside the
-" Body.
+" This is extremely useful and ergonomic for renaming variables, types or
+" otherwise in a text body.
 
 noremap  <silent> gs :set operatorfunc=<SID>do_subst_enter<cr>g@
 vnoremap <silent> gs :call <SID>v_do_subst_enter()<cr>
@@ -23,49 +19,28 @@ vnoremap <silent> gS :call <SID>v_do_subst_no_enter()<cr>
 " Hotkey for replacing the most recently searched matches.
 noremap <C-s> <esc>:<C-u>%s//
 
-let s:entered_with_change = v:false
-let s:entered_with_append = v:false
-
-let s:old_word=''
-let s:new_word=''
+let s:current_word_1 = ''
+let s:current_word = ''
 
-let s:override_word = ''
-function! OverrideChange()
-  let s:entered_with_change = v:true
-  let s:override_word = expand('<cword>')
-  return ''
-endfunction
-
-function! s:save_register_on_change()
-endfunction
+let s:old_word = ''
+let s:new_word = ''
 
-function! s:save_old_word() abort
-  if s:entered_with_change
-    let s:old_word = s:override_word
-  else
-    let s:old_word = expand("<cword>")
-  endif
+function! s:save_cur_word() abort
+  let s:current_word_1 = s:current_word
+  let s:current_word = expand("<cword>")
 endfunction
 
 function! s:save_new_word() abort
-  if s:entered_with_change
-    let s:entered_with_change = v:false
-    let s:new_word = expand("<cword>")
-  else
-    let s:new_word = expand("<cword>")
-  endif
+  let s:old_word = s:current_word_1
+  let s:new_word = expand("<cword>")
 endfunction
 
 augroup FieldMarshalSubstitute
   au!
-  autocmd InsertEnter * call s:save_old_word()
-  autocmd InsertLeave * call s:save_new_word()
+  autocmd CursorMoved * call s:save_cur_word()
+  autocmd TextChanged * call s:save_new_word()
 augroup END
 
-noremap <expr> c OverrideChange() . 'c'
-noremap <expr> s OverrideChange() . 's'
-noremap <expr> a OverrideChange() . 'a'
-
 function! s:do_subst_enter(...) abort
   call s:do_subst_priv("'[", "']", v:true)
 endfunction
-- 
cgit