行尾的 Vim 注释延续

Question

所以，假设我有一大段代码

int i = 0; // Do some junk here<cursor is here>

if(i == 0){
  blahblahblahblah;
}

blahblahblah;

是否可以告诉 vim，当我按 Enter 键时，我希望它会导致以下结果:

int i = 0; // Do some junk here
           // <cursor is here>

if(i == 0){
  blahblahblahblah;
}

blahblahblah;

我知道它会针对单独在线的评论执行此操作，但我无法弄清楚。

Answer 1

我不知道是否有一个插件(但可能有)，但是下面的映射应该可以通过按 Enter 添加一行的技巧(尽管有更多的方法可以添加该行):

" Function that adds new line starting with comment symbol if line does not 
" start with comment, but contains it.
function! s:NewLine(comsymb)
    let line=getline('.')
    " Check whether we are in comment. Assumes syntax highlighting is working 
    " correctly. Remove these lines if you never write “//” in a string literal
    if empty(filter(synstack(line('.'), min([col('.'), col('$')-1])),
                \   'stridx(tolower(synIDattr(v:val, "name")), "comment")!=-1'))
        return "\n"
    endif
    let cidx=stridx(line, a:comsymb)
    if cidx==-1
        " No comments
        return "\n"
    elseif cidx==0 || line[:(cidx-1)]!~#'\S'
        " This assumes that vim own continuation works correctly: do not do work 
        " that can be done by something else
        return "\n"
    endif
    " Preserve tab indentation if any, correctly replace non-indent tabs with 
    " spaces
    let nextline=substitute(line[:(cidx-1)], '\v^(\s*)(\S.*)$',
                \           '\=submatch(1).'.
                \             'repeat(" ", strdisplaywidth(submatch(2), '.
                \                                          indent('.').'))',
                \           'g').a:comsymb
    " Preserve presence of a space after comment start mark
    if line[cidx+len(a:comsymb)] is# ' '
        let nextline.=' '
    endif
    return "\n".((col('.')<col('$'))?("\e\"_c0"):("\<C-\>\<C-o>\"_d0")).nextline
endfunction

inoremap <expr> <CR> <SID>NewLine('//')