Provide FugitiveGenerate() and FugitiveParse()

plugin/fugitive.vim

@@ -152,6 +152,20 @@ function! FugitiveReal(...) abort
   return call('FugitivePath', a:000)
 endfunction
 
+function! FugitiveGenerate(...) abort
+  return fugitive#repo(a:0 > 1 ? a:2 : get(b:, 'git_dir', '')).translate(a:0 ? a:1 : '', 1)
+endfunction
+
+function! FugitiveParse(...) abort
+  let path = s:shellslash(a:0 ? a:1 : @%)
+  let vals = matchlist(path, '\c^fugitive:\%(//\)\=\(.\{-\}\)\%(//\|::\)\(\x\{40\}\|[0-3]\)\(/.*\)\=$')
+  if len(vals)
+    return [(vals[2] =~# '^.$' ? ':' : '') . vals[2] . substitute(vals[3], '^/', ':', ''), vals[1]]
+  endif
+  let v:errmsg = 'fugitive: invalid Fugitive URL ' . path
+  throw v:errmsg
+endfunction
+
 augroup fugitive
   autocmd!