[nvim] add indent detection

nvim/init.vim

@@ -36,10 +36,10 @@ Plug 'junegunn/vim-plug'
   Plug 'Yggdroot/indentLine'
   Plug 'henrik/vim-indexed-search'
   Plug 'andymass/vim-matchup'
-  " Plug 'tommcdo/vim-exchange'
   Plug 'inkarkat/vim-ingo-library'  " required by LineJuggler
   Plug 'inkarkat/vim-LineJuggler', { 'branch': 'stable' }
   Plug 'reedes/vim-pencil'
+  Plug 'ciaranm/detectindent'
 " }}}
 
 " Text objects {{{

nvim/plugin/editing.vim

@@ -6,6 +6,7 @@ set virtualedit=onemore
 
 set foldmethod=marker
 
+" use line C-style comments instead of block ones (/* ... */)
 set commentstring=//%s
 
 
@@ -30,6 +31,15 @@ set commentstring=//%s
   let g:indentLine_showFirstIndentLevel = 1
   let g:indentLine_fileTypeExclude = ['text', 'help', 'tutor', 'man']
 
+  let g:detectindent_preferred_indent = 2
+  let g:detectindent_preferred_expandtab = 1
+  " let g:detectindent_verbosity = 0
+
+  augroup vimrc-detect-indent
+    autocmd!
+    autocmd FileType * if empty(&bt) | DetectIndent | endif
+  augroup END
+
 " }}}