编程diff vim函数，vim diff映射

Question

我找到了这一功能

" Set up a keymapping from <Leader>df to a function call.
" (Note the function doesn't need to be defined beforehand.)
" Run this mapping silently. That is, when I call this mapping,
" don't bother showing "call DiffToggle()" on the command line.
nnoremap <silent> <Leader>df :call DiffToggle()<CR>

" Define a function called DiffToggle.
" The ! overwrites any existing definition by this name.
function! DiffToggle()
    " Test the setting 'diff', to see if it's on or off.
    " (Any :set option can be tested with &name.
    " See :help expr-option.)
    if &diff
        diffoff
    else
        diffthis
    endif
:endfunction

现在我想添加一个额外的条件，如果有一些选定的文本(可视模式)调用另一个命令，而不是diffthis，Linediff

阅读这个函数，我想我需要一些额外的set选项来测试，就像他们用&dif做的那样，但是使用了可视选项。类似于：

function! DiffToggle()
    if &dif
        diffoff
    elseif &visual
        Linediff
    else
        diffthis
    endif
:endfunction

这不起作用，但有没有人有任何线索让它发挥作用？此外，它将非常有用的任何参考，关于什么和多少这类设置变量是在vim。

编辑I在我的vimrc (Works)中得到了这样的结果：

"LINEDIFF/VIMDIFF
 "--------------

nnoremap <silent> <Leader>df :call DiffToggle('n')<CR>
xnoremap <silent> <Leader>df :call DiffToggle('x')<CR>

function! DiffToggle(mode) range
    echo "difftoggle..."
    if &diff
        diffoff
        echo "diffoff..."
    else
        if a:mode=='x'
            echo "linediff..."
            echo a:firstline."---".a:lastline
            call linediff#Linediff(a:firstline, a:lastline)
        else
            echo "diff..."
            diffthis
        endif
    endif
:endfunction

Answer 1

只需调用一个与xnoremap <Leader>df ...稍有不同的函数？当您处于可视模式时，将调用该功能。

或者，将模式作为参数传递给您的函数：

nnoremap <silent> <Leader>df :call DiffToggle('n')<CR>
xnoremap <silent> <Leader>df :call DiffToggle('x')<CR>

..。并检查函数中的a:mode，其原型如下：

function! DiffToggle(mode)