.vimrc

function! s:uniq(list) "{{{
    let s:dict = {}
    let counter = 1
    for i in a:list
        if !has_key(s:dict, i)
            let s:dict[i] = counter
            let counter += 1
        endif
    endfor

    function! s:cmp(a, b)
        return a:a == a:b ? 0 : a:a > a:b ? 1 : -1
    endfunction

    function! s:c(a, b)
        let [a, b] = [a:a, a:b]
        return eval(s:expr)
    endfunction

    try
        let s:expr = 's:cmp(s:dict[a], s:dict[b])'
        return sort(keys(s:dict), 's:c')
    finally
        delfunc s:cmp
        delfunc s:c
        unlet s:expr
        unlet s:dict
    endtry
endfunction "}}}