on the fly macro

README.md

目的は以下のコードおセレクトして、変換結果に置き換えること。

const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

期待する置き換え結果

const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

func (s State) String() string {
  switch s {
  case Stopped:
    return "Stopped"
  case Rebooting:
    return "Rebooting"
  case Terminated:
    return "Terminated"
  default:
    return "Unknown"
  }
}

:'<,'>Transform go_const_stringfy.rb<CR> でうまくいかない。 そもそも、escape が必要だと思うが、readfile()ではなく、quickrun に直接ファイルPATHを渡して読んでもらえないか？

/var/folders/ml/4y1cgytd3wx_9c87136syqq00000gp/T/vN5wXw9/187:19:in `transform': undefined method `downcase' for nil:NilClass (NoMethodError)
	from /var/folders/ml/4y1cgytd3wx_9c87136syqq00000gp/T/vN5wXw9/187:56:in `'const (

tmpl_duplicate.rb

v = "%s"
puts(v)
puts(v)

__END__
## Input

const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

## Output
const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)
const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

tmpl_eval.rb

v = eval("%s")
puts v

__END__
## Input
[1,2,3]

## Transformed
1
2
3

tmpl_go_const_stringfy.rb

def parse(s)
  enums = []
  type = ""
  s.split("\n").each do |e|
    next if e =~ /\(|\)/
    n = e.split
    if n.size == 1
      enums << n.first
    else
      type << n[1]
    end
    
  end
  [type, enums]
end

def transform(s)
  type, enums = *parse(s)
  v = type[0].downcase

  out = ""
  enums.each do |e|
    out << "  case #{e}:\n"
    out << "    return \"#{e}\"\n"
  end
  return <<-EOS
#{s}

func (#{v} #{type}) String() string {
  switch #{v} {
#{out.chomp}
  default:
    return "Unknown"
  }
}
  EOS
end


# "const (\n\tRunning State = iota\n\tStopped\n\tRebooting\n\tTerminated\n)"
s = "const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)"

# v = s 

v = "%s"
puts transform(v)

__END__

## Original

const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

__END__

## Input
const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

## Output
const (
	Running State = iota
	Stopped
	Rebooting
	Terminated
)

func (s State) String() string {
  switch s {
  case Stopped:
    return "Stopped"
  case Rebooting:
    return "Rebooting"
  case Terminated:
    return "Terminated"
  default:
    return "Unknown"
  }
}

transform.vim

function! Transform(template)
  let tmpl = join(readfile(a:template),"\n")
  let cmd = "QuickRun -outputter replace_region -type transform -mode v -hook/eval/template '" . tmpl . "'"
  exe cmd
endfunction

command! -range -nargs=1 -complete=file Transform :call Transform(<f-args>)

let g:quickrun_config.transform = {
      \ 'command': 'ruby',
      \ "hook/sweep/enable": 0,
      \ 'outputter': 'replace_region',
      \ 'hook/eval/enable': 1,
      \ }

" ex)
"  '<,'>Transform tmpl_eval.rb
"  '<,'>Transform tmpl_duplicate.rb