typescriptのimport先のファイルの読み込み

read_ts.vim

function! ReadFile() abort
  let s:currentPos = col('.')
  let s:colNum = s:currentPos - 1
  let s:lastPos = len(getline('.'))
  let s:fileName = ''
  let s:ext = '.' . expand("%:e")
  while s:colNum > -1
    if getline('.')[s:colNum] =~ "\['\"\]"
      break
    end
    let s:fileName =  getline('.')[s:colNum] . s:fileName
    let s:colNum = s:colNum - 1
  endwhile
  while s:currentPos < s:lastPos
    if getline('.')[s:currentPos] =~ "\['\"\]"
      break
    end
    let s:fileName =  s:fileName . getline('.')[s:currentPos]
    let s:currentPos = s:currentPos + 1
  endwhile
  let s:prevPath = ""
  let s:dirs = split(expand("%:p:h"), '/')
  if s:fileName =~ "^\\."
    let s:fullName = simplify(expand("%:p:h") . '/' . s:fileName)
  else
    for name in s:dirs
      let s:prevPath = s:prevPath . '/' . name
      if (name == "ts" && (s:ext == ".ts" || s:ext == ".tsx")) || (name == "es6")
        break
      endif
    endfor
    let s:fullName = simplify(s:prevPath . '/' . s:fileName)
  endif
  if !filereadable(s:fullName)
    if isdirectory(s:fullName)
      let s:fullName = s:fullName . '/index' . s:ext
    else
      if filereadable(s:fullName. '.ts')
        let s:fullName = s:fullName . '.ts'
      else
        if filereadable(s:fullName. '.tsx')
          let s:fullName = s:fullName . '.tsx'
        else
          if filereadable(s:fullName. '.d.ts')
            let s:fullName = s:fullName . '.d.ts'
          else
            let s:fullName = s:fullName . s:ext
          endif
        endif
      endif
    endif
  endif
  execute ':e ' . s:fullName
endfunction