I am looking to produce directional variants of the en-dash. A "left en-dash" should have half of ordinary inter-word spacing on its right and allow line-breaks only on its left; a "right en-dash" should have half of ordinary inter-word spacing on its left and allow line-breaks only on its right. This is intended to aid the visual parsing of parenthetical phrases: "Here - as in his other works - the composer alludes to Italian folk dances."
What is the best way to define such commands? Let's name them