Vim copies the line and comments on the old line

Question

I am trying to achieve the same as here, but in Vim.

Duplicate the line and comment on it

Basically, I want to align the line, comment on the old one, insert a new one and hold the cursor at the beginning of a new line and end in insert mode.

For instance:

def func (param)

will change to:

//def func (param)
def func (param)

I wrote a macro for it, put it in .vimrc, and I use it through@y

" copy-and-comment-line macro
" yank line, comment out original line, move cursor at the begining
" of copied line and end in insert mode
let @y='yypkui//kdklkl'

(I'm not sure if this will work for you, as it contains non-printable characters ~@that will not be displayed in the code block)

The macro works, but is there a built-in command in vim with which I can achieve the same?

Answer 1

This mapping should do it for you:

nnoremap YOURKEY YI//<esc>p

• .
• YOURKEY ( ),
• , , // . , , , , . , NERDCommenter vim-commentary, , , ( ) .