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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 t:git_blamer_window_number = winnr()
let restore = ''
if &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 -M ' . 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>
nnoremap <buffer> <Enter> :call <SID>GitShow()<CR>
" Restore starting file's scrollbind on exit
autocmd BufWinLeave <buffer>
\ execute b:git_blamer_restore
\ | call s:FocusOriginalWindow()
endfunction
function! s:FocusOriginalWindow()
augroup git_blamer
autocmd!
autocmd WinEnter *
\ execute t:git_blamer_window_number . 'wincmd w'
\ | call s:RemoveWindowFocusAutocmd()
augroup END
endfunction
function! s:RemoveWindowFocusAutocmd()
augroup git_blamer
autocmd!
augroup END
endfunction
function! s:GitShow()
execute '!git show ' . s:CommitSHAFromLine('.')
endfunction
function! s:CommitSHAFromLine(line)
let current_line = getline(a:line)
return matchstr(current_line, '\v^[0-9a-f]+')
endfunction
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