file←{                  ⍝ Apply operand function to native file tie.
    tie←⍵ ⎕NTIE 0       ⍝ open file.
    rslt←⍺⍺ tie         ⍝ operate on file.
    rslt⊣⎕NUNTIE tie    ⍝ close and return result.
}

code_colours

test script

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