[FeatureRequest] fallback to generic auto detect if filetype not configured

[ZSaberLv0]

Issue Prelude

• Category
  • Question
  • Bug
  • Suggestion

Issue Details

most of langs and complete engines have similar v:completed_item, I think it's possible to supply a generic fallback if filetype not configured, or if configured filetype has no param match

here's a sample for my case:

{'word': 'Show', 'menu': 'void Show(string text, int duration = 3000) [OS]', 'user_data': '{"cid":1588229487,"source":"OmniSharp","index":7}', 'info': '', 'kind': '', 'abbr': 'Show'} 

parse pattern sample: (may be abbr/info/menu in v:completed_item)

ReturnType<P0, P1> FuncName<P0, P1>(
    ref ParamType0<P0, P1> p0,
    ParamType1 const &p1 = DefaultValue,
    ...)

[ZSaberLv0]

https://github.com/ZSaberLv0/CompleteParameter_generic.vim

I have added a plugin to bypass this issue