Change jsx/tsx provider, closes #400

autoload/jsx_pretty/comment.vim

@@ -0,0 +1,41 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'jsx') != -1
+  finish
+endif
+
+function! jsx_pretty#comment#update_commentstring(original)
+  let syn_current = s:syn_name(line('.'), col('.'))
+  let syn_start = s:syn_name(line('.'), 1)
+  let save_cursor = getcurpos()
+
+  if syn_start =~ '^jsx'
+    let line = getline(".")
+    let start = len(matchstr(line, '^\s*'))
+    let syn_name = s:syn_name(line('.'), start + 1)
+
+    if line =~ '^\s*//'
+      let &l:commentstring = '// %s'
+    elseif s:syn_contains(line('.'), col('.'), 'jsxTaggedRegion')
+      let &l:commentstring = '<!-- %s -->'
+    elseif syn_name =~ '^jsxAttrib'
+      let &l:commentstring = '// %s'
+    else
+      let &l:commentstring = '{/* %s */}'
+    endif
+  else
+    let &l:commentstring = a:original
+  endif
+
+  " Restore the cursor position
+  call setpos('.', save_cursor)
+endfunction
+
+function! s:syn_name(lnum, cnum)
+  let syn_id = get(synstack(a:lnum, a:cnum), -1)
+  return synIDattr(syn_id, "name")
+endfunction
+
+function! s:syn_contains(lnum, cnum, syn_name)
+  let stack = synstack(a:lnum, a:cnum)
+  let syn_names = map(stack, 'synIDattr(v:val, "name")')
+  return index(syn_names, a:syn_name) >= 0
+endfunction