9base

revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
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_b_x (180B)

      1 /build_bx {
      2     pop
      3     size 2 div /side exch def
      4     currentpoint
      5     newpath
      6     moveto
      7     0 side rlineto
      8     side 0 rlineto
      9     0 side neg rlineto
     10     closepath
     11     fill
     12 } def