Initial go support

autoload/sj/go.vim

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+function! sj#go#SplitStruct()
+  let [start, end] = sj#LocateBracesOnLine('{', '}', 'goString', 'goComment')
+  let args = sj#ParseJsonObjectBody(start + 1, end - 1)
+  call sj#ReplaceCols(start + 1, end - 1, "\n".join(args, ",\n").",\n")
+endfunction
+
+function! sj#go#JoinStruct()
+  let start_lineno = line('.')
+
+  if search('{$', 'Wc', line('.')) <= 0
+    return 0
+  endif
+
+  normal! %
+  let end_lineno = line('.')
+
+  if start_lineno == end_lineno
+    " we haven't moved, brackets not found
+    return 0
+  endif
+
+  let arguments = []
+  for line in getbufline('%', start_lineno + 1, end_lineno - 1)
+    let argument = substitute(line, ',$', '', '')
+    let argument = sj#Trim(argument)
+    call add(arguments, argument)
+  endfor
+
+  call sj#ReplaceMotion('va{', '{'.join(arguments, ', ').'}')
+  return 1
+endfunction

examples/test.go

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+StructType{1, "asdf", []int{1, 2, 3}}

ftplugin/go/splitjoin.vim

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+let b:splitjoin_split_callbacks = [
+      \ 'sj#go#SplitStruct',
+      \ ]
+
+let b:splitjoin_join_callbacks = [
+      \ 'sj#go#JoinStruct',
+      \ ]