first vim configs: statusline + yaml configs

vim/ftplugin/eyaml/folding.vim

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+../yaml/folding.vim

vim/ftplugin/raml/folding.vim

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+../yaml/folding.vim

vim/ftplugin/sls/folding.vim

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+../yaml/folding.vim

vim/ftplugin/yaml/folding.vim

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+function! YamlFolds()
+  let previous_level = indent(prevnonblank(v:lnum - 1)) / &shiftwidth
+  let current_level = indent(v:lnum) / &shiftwidth
+  let next_level = indent(nextnonblank(v:lnum + 1)) / &shiftwidth
+
+  if getline(v:lnum + 1) =~ '^\s*$'
+    return "="
+
+  elseif current_level < next_level
+    return next_level
+
+  elseif current_level > next_level
+    return ('s' . (current_level - next_level))
+
+  elseif current_level == previous_level
+    return "="
+
+  endif
+
+  return next_level
+endfunction
+
+function! YamlFoldText()
+  let lines = v:foldend - v:foldstart
+  return getline(v:foldstart) . '   (level ' . v:foldlevel . ', lines ' . lines . ')'
+endfunction
+
+
+setlocal foldmethod=expr
+setlocal foldexpr=YamlFolds()
+setlocal foldtext=YamlFoldText()
+
+
+let b:undo_ftplugin =
+      \ exists('b:undo_ftplugin')
+        \  ? b:undo_ftplugin . ' | '
+        \ : ''
+      \ . 'setlocal foldexpr< foldmethod< foldtext<'