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"
" cursorline_current: If 'cursorline' is globally on, only enable it for the
" current window, and only when not in insert mode. Essentially, make
" 'cursorline' follow the actual normal-mode cursor as much as possible.
"
" Author: Tom Ryder <tom@sanctum.geek.nz>
" License: Same as Vim itself
"
if exists('g:loaded_cursorline_current') || &compatible
finish
endif
if !has('autocmd') || !has('windows')
finish
endif
let g:loaded_cursorline_current = 1
" Suspend 'cursorline' when a window is inactive or inserting
function! s:Suspend() abort
let w:cursorline_current_cache = &l:cursorline
setlocal nocursorline
endfunction
" Restore 'cursorline' when a window is active and non-insert
function! s:Restore() abort
" If we don't have a value for 'cursorline' from a previous s:Suspend(), use
" the global value as the default
if !exists('w:cursorline_current_cache')
let w:cursorline_current_cache = &g:cursorline
endif
" Restore local value to the cached value and clear it
let &l:cursorline = w:cursorline_current_cache
unlet w:cursorline_current_cache
endfunction
" Call s:Suspend() on all windows besides the current one
function! s:Load() abort
" Cache current window index
let l:wcur = winnr()
" Iterate through all the windows and suspend all but the current one
for l:wnum in range(1, winnr('$'))
if l:wnum != l:wcur
execute l:wnum . 'windo call s:Suspend()'
endif
endfor
" Return to the window in which we started
execute l:wcur . 'wincmd w'
endfunction
" Set up hooks for toggling 'cursorline'
augroup cursorline_current
autocmd!
" Turn off 'cursorline' for other windows on load
if exists('##VimEnter')
autocmd VimEnter * call s:Load()
endif
" Turn off 'cursorline' when leaving a window
if exists('##WinEnter') && exists('##WinLeave')
autocmd WinLeave * call s:Suspend()
autocmd WinEnter * call s:Restore()
endif
" Turn off 'cursorline' when in insert mode
if exists('##InsertEnter') && exists('##InsertLeave')
autocmd InsertEnter * call s:Suspend()
autocmd InsertLeave * call s:Restore()
endif
augroup END
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