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" Open a new split with a `git blame` of the current file
" Inspired by Ben Orenstein
" https://github.com/r00k/dotfiles/blob/7874508b825fd754e4ec3259da65f324ab96c8ea/vimrc#L74
function! git_blamer#Blame()
let l:top_line = line('w0') + &scrolloff
let l:line_number = line('.')
let l:buffer_name = shellescape(bufname('%'))
let l:buffer_number = bufnr('%')
let restore = ''
if &l:wrap
let restore = '| call setbufvar(' . l:buffer_number . ', "&wrap", 1)'
endif
setlocal scrollbind cursorbind nowrap
" Open new window
leftabove vnew
let b:git_blamer_restore = 'call setbufvar(' . l:buffer_number . ', "&scrollbind", 0) |
\ call setbufvar(' . l:buffer_number . ', "&cursorbind", 0)'
\ . restore
" Read in `git blame` output
execute 'read !git blame -w ' . l:buffer_name
" Delete empty first line
1 delete
setlocal nomodified nomodifiable
" Move cursor to position in starting file
call cursor(l:top_line, 0)
normal! zt
call cursor(l:line_number, 0)
setlocal noswapfile nowrap nolist nobuflisted buftype=nofile bufhidden=wipe
setlocal scrollbind cursorbind
syncbind
nnoremap <buffer> q :q<CR>
" Restore starting file's scrollbind on exit
autocmd BufWinLeave <buffer> execute b:git_blamer_restore
endfunction
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