How it works
MacVim registers the mvim url handler to open files and directly jump to lines and columns.
We can use this to convert stacktraces reported by RSpec into clickable mvim-links.
Requires at least MacVim 7.3. To change how MacVim opens external files go to
'Preferences' > 'Open files from applications' and select 'in the current window' and from
the dropdown menu select 'and set the arglist' to open the file in the last active buffer.
Cmd-Click on an mvim-link to open the file.