Allow opting out of :A family of commands

Note that :0R is equivalent to :A, and can be used as a replacement in
its absence.

Resolves: tpope#582

Author: tpope

autoload/rails.vim

@@ -2159,20 +2159,23 @@ endfunction
 " }}}1
 " Navigation {{{1
 
-function! s:BufNavCommands()
+function! s:BufNavCommands() abort
+  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   R   exe   s:Related('<mods> E<bang>',<line1>,<line2>,<count>,<f-args>)
+  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RE  exe   s:Related('<mods> E<bang>',<line1>,<line2>,<count>,<f-args>)
+  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RS  exe   s:Related('<mods> S<bang>',<line1>,<line2>,<count>,<f-args>)
+  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RV  exe   s:Related('<mods> V<bang>',<line1>,<line2>,<count>,<f-args>)
+  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RT  exe   s:Related('<mods> T<bang>',<line1>,<line2>,<count>,<f-args>)
+  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_edit      RD  exe   s:Related('<mods> D<bang>',<line1>,<line2>,<count>,<f-args>)
+  if get(g:, 'rails_no_alternate_commands', 0)
+    return
+  endif
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_alternate A   exe s:Alternate('<mods> E<bang>',<line1>,<line2>,<count>,<f-args>)
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_alternate AE  exe s:Alternate('<mods> E<bang>',<line1>,<line2>,<count>,<f-args>)
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_alternate AS  exe s:Alternate('<mods> S<bang>',<line1>,<line2>,<count>,<f-args>)
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_alternate AV  exe s:Alternate('<mods> V<bang>',<line1>,<line2>,<count>,<f-args>)
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_alternate AT  exe s:Alternate('<mods> T<bang>',<line1>,<line2>,<count>,<f-args>)
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_edit      AD  exe s:Alternate('<mods> D<bang>',<line1>,<line2>,<count>,<f-args>)
   command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_edit      AR  exe s:Alternate('<mods> D<bang>',<line1>,<line2>,<count>,<f-args>)
-  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   R   exe   s:Related('<mods> E<bang>',<line1>,<line2>,<count>,<f-args>)
-  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RE  exe   s:Related('<mods> E<bang>',<line1>,<line2>,<count>,<f-args>)
-  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RS  exe   s:Related('<mods> S<bang>',<line1>,<line2>,<count>,<f-args>)
-  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RV  exe   s:Related('<mods> V<bang>',<line1>,<line2>,<count>,<f-args>)
-  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_related   RT  exe   s:Related('<mods> T<bang>',<line1>,<line2>,<count>,<f-args>)
-  command! -buffer -bar -nargs=* -range=0 -complete=customlist,s:Complete_edit      RD  exe   s:Related('<mods> D<bang>',<line1>,<line2>,<count>,<f-args>)
 endfunction
 
 function! s:jumpargs(file, jump) abort