Fix fatal file length messages.

Author: black-desk

autoload/blamer.vim

@@ -8,6 +8,8 @@ let g:blamer_autoloaded = 1
 let s:save_cpo = &cpoptions
 set cpoptions&vim
 
+let s:buffer = tempname()
+
 let s:blamer_prefix = get(g:, 'blamer_prefix', '   ')
 let s:blamer_template = get(g:, 'blamer_template', '<author>, <author-time> • <summary>')
 let s:blamer_date_format = get(g:, 'blamer_date_format', '%d/%m/%y %H:%M')
@@ -126,7 +128,8 @@ function! blamer#GetMessages(file, line_number, line_count) abort
   let l:dir_path = shellescape(s:substitute_path_separator(expand('%:h')))
   let l:end_line = a:line_number + a:line_count - 1
   let l:file_path_escaped = shellescape(a:file)
-  let l:command = 'git -C ' . l:dir_path . ' --no-pager blame --line-porcelain -L ' . a:line_number . ',' . l:end_line . ' -- ' . l:file_path_escaped
+  silent! execute 'write' fnameescape(s:buffer)
+  let l:command = 'git -C ' . l:dir_path . ' --no-pager blame --line-porcelain -L ' . a:line_number . ',' . l:end_line . ' --contents ' . s:buffer . ' -- ' . l:file_path_escaped
   let l:result = system(l:command)
   let l:lines = split(l:result, '\n')