Atom's pane:split-* commands suck if you want to do anything else but re-open
the current document in your shiny new pane. Pain Split is here to help.
Default key bindings go something like this. Sorry for polluting the pane:*
namespace.
'.platform-darwin':
# Open an empty pane and bring it to focus to do as you will.
# If there had to be only one way to split panes, this should have
# been it.
'cmd-k left': 'pane:split-left-creating-empty-pane'
'cmd-k right': 'pane:split-right-creating-empty-pane'
'cmd-k up': 'pane:split-up-creating-empty-pane'
'cmd-k down': 'pane:split-down-creating-empty-pane'
# Open a new pane and move the current editor tab to it.
'cmd-k m left': 'pane:split-left-moving-current-tab'
'cmd-k m right': 'pane:split-right-moving-current-tab'
'cmd-k m up': 'pane:split-up-moving-current-tab'
'cmd-k m down': 'pane:split-down-moving-current-tab'
# Atom's default behavior. "D" for duplicate the current tab.
# It's still there if you want it, I guess.
'cmd-k d left': 'pane:split-left'
'cmd-k d right': 'pane:split-right'
'cmd-k d up': 'pane:split-up'
'cmd-k d down': 'pane:split-down'