Join two lines in Vim without moving the cursor

Question

How can I join two lines in Vim and leave the cursor in its original position instead of it jumping to the merge point?

For example, take the the following two lines with the cursor at the position indicated by the caret:

this is ^line one
this is line two

Merging by J produces:

this is line one ^this is line two

How can I produce:

this is ^line one this is line two

I have tried things like Ctrl + O and variations of ''. None of these seem to work. They go to the beginning of the line, not to the original cursor position.

Answer 1

Another approach that wouldn't stomp on marks would be this:

:nnoremap <silent> J :let p=getpos('.')<bar>join<bar>call setpos('.', p)<cr>

Much more verbose but it prevents you from losing a mark.

• :nnoremap - Non-recursive map
• <silent> - Do not echo anything when the mapping is pressed
• J - Key to map
• :let p=getpos('.') - Store cursor position
• <bar> - Command separator (| for maps, see :help map_bar)
• join - The ex command for normal's J
• <bar> - ...
• call setpos('.', p) - Restore cursor position
• <cr> - Run the commands

Answer 2

You can do it like:

:nnoremap <F2> mbJ`b

This assigns the following actions to the F2 key:

1. That is, create a mark (mb, but NOTE if you had set previously the b mark, than it gets overwritten!)
2. Join the lines
3. Jump back to the previous mark (`b)