Ensure $DISPLAY exists for xsel or xclip + add cygwin /dev/clipboard … #70
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…support.
xsel and xclip both exist for cygwin when cygwin/X is installed, but it is much less common to have the X server running. Ensure that the $DISPLAY environment variable is set when determining which command to pick.
Additionally, cygwin has a built-in virtual device called /dev/clipboard that we can leverage instead of requiring putclip to be installed. Added support for that.
If you would like the test for $DISPLAY to be handled in another manner, I am open to editing this PR to meet those needs, but this worked in both my linux and windows/cygwin environment after the changes as is.