wsmerge←{                                   ⍝ {protected} merge from saved ws.
    ⍺←0 ⋄ ⍺{                                ⍝ default: unprotected merge.
        ⍺⍎'⎕nl ',⍕⍵                         ⍝ local-name-free (clean) namelist.
    }{                                      ⍝ operand passed to operator:
        ⍺ ⍺⍺{                               ⍝ protection and clean namelist.
            name←(1+⍴⍕⎕NS'')↓⍕⍵             ⍝ relative space name.
            home←name ⎕NS''                 ⍝ ensure space exists.
            sink←⍵.⎕EX home ⍺⍺ 0,⍺/2 3 4    ⍝ prevent overwrites if protected.
            home ⍵.{⍺ ⎕NS ⎕NL ⍵}2 3 4       ⍝ copy to home space.
        }¨(⎕NS''){                          ⍝ temporary space for copy.
            ⍬{                              ⍝ vector of sub-space refs.
                1∊⍵=⍺:⍺                     ⍝ already been here: quit.
                ⍵.(↑∇∘⍎⍨/⌽(⊂⍺,⍵),↓⎕NL 9)    ⍝ recursively traverse sub-spaces.
            }⍎'⍺.⎕CY ⍵ ⋄ ⍺'                 ⍝ ref to import space.
        }⍵
    }⍵
}

code_colours

test script

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