Easily reformat function arguments to multiple lines in Vim

Question

In particular, when editing legacy C ++ code, I often manually reformat something like this:

SomeObject doSomething(firstType argumentOne, secondType argumentTwo, thirdType argumentThree); 

more or less like this:

 SomeObject doSomething(firstType argumentOne, secondType argumentTwo, thirdType argumentThree); 

Is there a built-in command for this? If not, can someone suggest a plugin or provide some VimScript code for it? ( J or gq can very easily change the process, so you don't need to go in both directions.)

Answer 1

You can use splitjoin .

 SomeObject doSomething(firstType argumentOne, secondType argumentTwo, thirdType argumentThree); 

Inside or in brackets, type gS to separate. You get:

 SomeObject doSomething(firstType argumentOne, secondType argumentTwo, thirdType argumentThree); 

You can also use vim-argwrap

Answer 2

Here is what I put into my .vimrc . It is more flexible than @rbernabe's answer; it formats based on the global settings of cinoptions and simply breaks into commas (and therefore can be used for more functions if necessary).

 function FoldArgumentsOntoMultipleLines() substitute@,\s*@,\r@ge normal v``=" endfunction nnoremap <F2> :call FoldArgumentsOntoMultipleLines()<CR> inoremap <F2> <Esc>:call FoldArgumentsOntoMultipleLines()<CR>a 

This displays F2 in normal and insert mode to perform searches and replace in the current line, which converts all commas (with 0 or more spaces after each) to a comma with a carriage return after each, then selects the whole group and indentation using Vim builtin = .

A well-known drawback of this solution relates to lines that include several parameters of the template (it is divided only by their commas, and not only by commas of normal parameters).

Answer 3

I would set the register to a predefined macro. After some tests, I got the following:

 let @x="/\\w\\+ \\w\\+(\nf(_:s\\(\\w\\+\\)\\@<=,/,\\r /g\n" 

Using this line in your vimrc, you can format the methods by executing the x: @x macro with the cursor over the line you want to format. It adds 12 spaces for indentation, specified as follows:

 | SomeObject doSomething(firstType argumentOne, secondType argumentTwo, thirdType argumentThree); 

After executing the macro: @x you get

 SomeObject doSomething(firstType argumentOne, secondType argumentTwo, thirdType argumentThree); 

If you are in the function definition line, you can simply do the replacement:

 :s\(\w\+\)\@,<=,/,\r /g 

This is easy to put in display:

 nmap <F4> :s/\(\w\+\)\@<=,/,\r /g<CR>