Add styled-components, closes #407

after/ftplugin/javascript.vim

@@ -49,3 +49,40 @@ augroup jsx_comment
 augroup end
 
 setlocal suffixesadd+=.jsx
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'styled-components') != -1
+  finish
+endif
+
+" Vim filetype plugin file
+" Language:   styled-components (js/ts)
+" Maintainer: Karl Fleischmann <fleischmann.karl@gmail.com>
+" URL:        https://github.com/styled-components/vim-styled-components
+
+fu! s:GetSyntaxNames(lnum, cnum)
+  return map(synstack(a:lnum, a:cnum), 'synIDattr(v:val, "name")')
+endfu
+
+" re-implement SynSOL of vim-jsx
+fu! s:SynSOL(lnum)
+  return s:GetSyntaxNames(a:lnum, 1)
+endfu
+
+"" Return whether the current line is a jsTemplateString
+fu! IsStyledDefinition(lnum)
+  " iterate through all syntax items in the given line
+  for item in s:SynSOL(a:lnum)
+    " if syntax-item is a jsTemplateString return 1 - true
+    " `==#` is a match case comparison of the item
+    if item ==# 'styledDefinition'
+      return 1
+    endif
+  endfor
+
+  " fallback to 0 - false
+  return 0
+endfu
+
+if exists('&ofu')
+  let b:prevofu=&ofu
+  setl omnifunc=styledcomplete#CompleteSC
+endif