add_cdo_complete_to_your_vimrc

"++++++++++++++++++++++++++++++++++++
"++++++++++ CDO COMPLETION ++++++++++
"++++++++++++++++++++++++++++++++++++
" reads in all cdo operators from your locally installed cdo
" by executing cdo --operator and completes those if
"  * you hit <C-X><C-U>
"  * cdo_completion is enabled
"  * cdo_version is later than 1.7.1 
"
" also a variable completion for your most-used files is done if
"  * filepath of those datasets is set
"  * vars completion is 'ENABLE'd


" 'ENABLE' cdo completion or 'DISABLE'
let s:cdo_completion = 'ENABLE'

" cdo completion
" if filename ends with 'sh' use cdo completion
if s:cdo_completion == 'ENABLE'
  let s:completion_language='cdo'

  " check for cdo version  
  let s:cdo_version_data = system('cdo --version 2>&1 | head -n 1 | grep -o "[0-9].[0-9].[0-9]"')
  let s:cdo_version = s:cdo_version_data[0] . s:cdo_version_data[2] . s:cdo_version_data[4] " gets cdo version 1.7.2 as 170
  silent echo s:cdo_version

  " check if cdo version is capable of cdo --operator, so if version later than 1.7.1
  if s:cdo_version <=170 
    echo "need to update to cdo 1.7.1 or later to use vim autocompletion for cdo"
	let s:cdo_completion = 'DISABLE'
  elseif s:cdo_version == ''
	echo "cannot get cdo -V, needed for autocompletion"
	let s:cdo_completion = 'DISABLE'
  " if cdo --operator works
  elseif s:cdo_version >= 171
    silent echo "for vim autocompletion use C-X C-U"
	let s:cdo_completion = 'ENABLE'
 
    "cdo does --operators
    "get cdo operators from your cdo version
    let s:cdo_data = split(system('cdo --operators'), nr2char(10))
    " check if list has entries
    if empty(s:cdo_data)
  	  echo "ERROR:List from 'cdo --operators' is empty"
    endif
	
    set completefunc=CDOComplete
    " modify completition options, more info in :help completeopt or 
    " http://vimdoc.sourceforge.net/htmldoc/options.html#'completeopt' 
    set completeopt=longest,menu
   
    " to be executed by user by C-X C-U
    fun! CDOComplete(findstart, base)
      if a:findstart && s:cdo_completion == 'ENABLE'
        let l:line = getline('.')
        let l:start = col('.') - 1
        while l:start > 0 && l:line[l:start - 1] =~ '\a'
          let l:start -= 1
        endwhile
        return start
      elseif s:cdo_completion == 'ENABLE'
        " Record what matches − we pass this to complete() later
        let l:res = []
        " Find cdo matches
        for l:line in s:cdo_data
        " Check if it matches what we're trying to complete
          if split(l:line)[0] =~ '^' . a:base
          " It matches! See :help complete() for the full docs on the key names
          " for this dict.
            call add(l:res, {
              \ 'icase': 1,
              \ 'word': split(l:line)[0],
              \ 'abbr': split(l:line)[0],
              \ 'menu': 'CDO: ' . join(split(l:line)[1:]),
              \ })
          endif
        endfor
		
	" varibale completion
	if s:vars_completion == 'ENABLE'
	  " Find variable matches
	  for l:line in s:vars_data
          " Check if it matches what we're trying to complete
            if split(l:line)[1] =~ '^' . a:base
            " It matches! See :help complete() for the full docs on the key names
            " for this dict.
              call add(l:res, {
                \ 'icase': 1,
                \ 'word': split(l:line)[1],
                \ 'abbr': split(l:line)[1],
                \ 'menu': 'Variable: ' . join(split(l:line)[2:]),
                \ })
            endif
          endfor
	endif 

        return res
      endif
    endfun
  endif "for check cdo_version > 1.7.1
endif

"++++++++++++++++++++++++++++++++++++
"++++++++ Variable COMPLETION +++++++
"++++++++++++++++++++++++++++++++++++
" reads in all variables from certain datasets
" by executing cdo vardes datasets and completes those if
"  * you hit <C-X><C-U>
"  * vars_completion is enabled
"  * cdo is installed
"  * ncl_completion or cdo_completion are enabled

" 'ENABLE' variablecompletion or 'DISABLE'
let s:vars_completion = 'ENABLE'

" variable completion data gathering
" set path for file to act cdo vardes on
" CHANGE for your own data
if s:vars_completion == 'ENABLE'
  silent echo "vars completion enabled"
  let s:vars_data_dir = '/work/mh1007/mpiesm1/experiments/lkm0101/outdata/'
  let s:vars_data_strs = ['hamocc/lkm0101_hamocc_data_2d_mm_19990101_19991231.nc', 'mpiom/lkm0101_mpiom_data_2d_mm_19990101_19991231.nc', 'mpiom/lkm0101_mpiom_data_3d_mm_19990101_19991231.nc', 'hamocc/lkm0101_hamocc_data_3d_ym_19990101_19991231.nc' ]

  let s:vars_data = []
  for s:vars_data_str in s:vars_data_strs
    let s:cdo_vardes_str = 'cdo vardes ' . s:vars_data_dir . s:vars_data_str
    let s:vars_data += split(system(s:cdo_vardes_str), nr2char(10))
  endfor
endif