Insert predefined text on keyboard shortcut

Question

I often insert binding.pry to my ruby files when I debug them. As I use Vim I'd love to automate it to avoid retyping it every time. How could I do it?

The exact sequence I'd like to map is:

1. Insert new line.
2. Insert binding.pry to the newly created line.
3. Return to normal mode.

EDIT: binding.pry is text I want to paste, not a file.

Before insert:

a = 1
b = 2

After insert:

a = 1
binding.pry
b = 2

Answer 1

Record a macro (untested)

qq               " record macro to register q 
o                " insert empty line below cursor
esc              " exit insert-mode
:r /path/to/binding.pry   " insert content of file
esc              " cmd-mode
q                " end recording

To execute macro, do

@q

Or add the following to your .vimrc file

update

To insert the string binding.pry the mapping becomes:

map ,p obinding.pry<ESC>

Answer 2

Easiest is an abbreviation that is triggered from insert mode:

:ia debug <CR>binding.pry

Now, when you type debug, the text binding.pry is inserted on a new line.

Documentation: :help abbreviations