Omni completion for thesaurus in VIM

thesauri.vim

" Moby Project thesaurus integration for vim
" Author: Tom Kurth <tom@losthalo.org>
" Homepage: http://github.com/tomku/thesauri
" License: GPLv2
" Last Modified: Fri, 31 Mar 2017

fun! CompleteThesauri(findstart, base)
    if a:findstart
        let line = getline('.')
        let start = col('.') - 1
        while start > 0 && line[start - 1] !~ '\s'
            let start -= 1
        endwhile
        return start
    else
        let prequery ="rg -N --color never \"^([\w\s]+)?" . a:base . "([\s\w]+)?,\" " . g:mobythesaurus_file . "| awk -F/ '{print $1}'"
        let query ="rg -N --color never \"^" . a:base . ",\" " . g:mobythesaurus_file . "| tr \",\" \"\\n\" "
        let output = system(query)
        if v:shell_error > 1
            return []
        elseif v:shell_error == 1
            return []
        else
            let matches = []
            for m in split(output, "\n")
                call add(matches, m)
            endfor
            return {'words': matches, 'refresh': 'always'}
        endif
    endif
endfun