Draw fences by tails

chomp,print$_&&s/|/|/g<s/(.)\K\|(?=\1)/ /g,($p^$_|y/|/ /cr)=~y/\\!-z/|-/r=~s/.?-+./$&=~y! |!-+!r/ger,$/,$p=$_,$/for<>,$_

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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