ArgWrap

ArgWrap is an industrial strength argument wrapping and unwrapping extension for the Vim text editor. It can be used for collapsing and expanding everything from function calls to array and dictionary definitions.

Installation

1. Clone or otherwise download the latest version of the ArgWrap extension from its GitHub page. If you are using pathogen.vim for plugin management you can clone the repository directly to your bundle directory:

   $ git clone https://github.com/FooSoft/vim-argwrap ~/.vim/bundle/vim-argwrap
   

2. Create a keyboard binding for the ArgWrap command inside your ~/.vimrc file. For example, to declare a normal mode mapping, add the following command:

   nnoremap <silent> <leader>a :ArgWrap<CR>
   

Configuration

You can customize the wrapping/unwrapping behavior of this extension by setting values for any of the following optional buffer and global variables in your .vimrc file:

• g:argwrap_wrap_closing_brace or b:argwrap_wrap_closing_brace

  Specifies if the closing brace should be wrapped to a new line. This setting is helpful when working with languages such as Google's Go, which enforce coding style during compliation.

  Brace wrapping enabled (default)

  Foo(
      wibble,
      wobble,
      wubble
  )
  

  Brace wrapping disabled (let g:argwrap_wrap_closing_brace = 0)

  Foo(
      wibble,
      wobble,
      wubble)
  

• g:argwrap_padded_braces or b:argwrap_wrap_closing_brace

  Specifies which brace types should be padded on the inside with spaces:

  '': do not add padding for any braces (empty string):

  [1, 2, 3]
  {1, 2, 3}
  

  '[': padding for square braces only (curly braces are not padded):

  [ 1, 2, 3 ]
  {1, 2, 3}
  

  Padding can be specified for multiple brace types as follows:

  let g:argwrap_padded_braces = '[{'
  

Usage

1. Position the cursor inside of the scope of the parenthesis, brackets or curly braces you wish to wrap/unwrap (not on top, before or after them).

2. Execute the keyboard binding you defined above to toggle the wrapping and unwrapping of arguments.

Examples

Below are some examples of common use cases demonstrating the capabilities of ArgWrap. Note that the extension functions identically regardless if it is being applied to a function call, list or dictionary definition.

Let's begin with a simple function invocation. When there are many arguments being passed to the function, we often wish to wrap them to improve code readability. If you position your cursor anywhere between the parenthesis and execute the ArgWrap command, the argument list will be wrapped to one per line.

Foo(wibble, wobble, wubble)

Becomes this:

Foo(
    wibble,
    wobble,
    wubble
)

List definitions work in a similar fashion:

foo = [bar, baz, qux, quux, corge]

Becomes this:

foo = [
    bar,
    baz,
    qux,
    quux,
    corge
]

Dictionaries also work the way you expected them to:

foo = {bar: 1, baz: 3, qux: 3, quux: 7}

Becomes this:

foo = {
    bar: 1,
    baz: 3,
    qux: 3,
    quux: 7
}

Finally, nested combinations of all the above are also supported:

Foo([wibble, wobble, wubble], spam, {bar: baz, qux: [1, 3, 3, 7]})

Becomes this:

Foo(
    [wibble, wobble, wubble],
    spam,
    {bar: baz, qux: [1, 3, 3, 7]}
)

You can continue argument expansion to:

Foo(
    [
        wibble,
        wobble,
        wubble
    ],
    spam,
    {
        bar: baz,
        qux: [
            1,
            3,
            3,
            7
        ]
    }
)

The argument wrapping and unwrapping operations demonstrated above are easily reversible and correctly preserve the indentation of the surrounding code. This extension has been tested to work in scenarios of various complexity, but if you discover a problem don't hesitate to report it.