keycommand – Simple creation of commands with key-value arguments

The pack­age (which re­quires e-TeX) pro­vides a nat­u­ral way to de­fine com­mands with op­tional keys.
The pack­age pro­vides \newk­ey­command, \re­newk­ey­command, \providek­ey­command, \newkeyen­vi­ron­ment and \re­newkeyen­vi­ron­ment, to­gether with \key­cmd for a more ad­vanced in­ter­face.
The pack­age is based on kvsetkeys by Heiko Oberdiek.