How to left-align IO stream operators << and >> in Vim?

Question

For example, instead of following alignment:

std::cout << "Hello " << "Hello "
  << "world ";

I want left-align the << operator, as:

std::cout << "Hello " << " Hello "
          << "world ";

By default, Vim chooses the first one. Looks like it just increases the indentation by one level for the new line.

So, is there any way that I can get the second alignment by default?

P.S. I already tried the Align plugin, but it aligns the region in a table, like:

std::cout << "Hello World" << "Hello "
          << "World"       << "World Hello".

which I consider too sparse.

Answer 1

I'm using Tabular and this works for me

:Tabularize /^[^<<]\S*

Output:

std::cout << "Hello World" << "Hello "
          << "world " << "World Hello";

Explanation

^ Beginning followed by << up to the to first <<, then the match will start exactly at the first <<.

Answer 2

With the Align plugin, the command for aligning selected lines of text the way you want is :<,>Align! l: <<. The first argument is an AlignCtrl Command that tells it to left-align the first field and treat the rest of the line as a single field. The second argument is the separator. The Align manual explains all of the available arguments and pre-defined mappings.