displayr←{⎕IO ⎕ML←0 1                                                  ⍝ Boxed display of array

    box←{                                                              ⍝ box with type and axes
        vrt hrz(¯1+⍴⍵)⍴¨'│─'                                          ⍝ vert. and horiz. lines
        top(1+⍴hrz)((¯1↑⍺)⌷'─⊖',⊂⍕¯1↑1⊃⍺),hrz                       ⍝ upper border with axis
        bot(top)(⊃2↓⍺),hrz                                          ⍝ lower border with type
        rgt←'┐│',vrt,'┘'                                               ⍝ right side with corners
        lax(⊃¨(¯1↓3↓⍺)⌷¨(-1⌈¯1+⍴1⊃⍺)(⊂'│⌽'),¨⊂∘⍕¨¯1↓0,1⊃⍺),¨⊂vrt     ⍝ left side(s) with axes,
        lax(⊂1+⍴vrt)↑¨(lax~¨⊂' '),¨'│'                                ⍝ pad and trim
        lft←⍉'┌',(lax),'└'                                            ⍝ ... and corners
        lft,(top⍪⍵⍪bot),rgt                                            ⍝ fully boxed array
    }

    deco←{⍺←type open ⍵ ⋄ (⍴⍴⍵),(⊂⍴⍵),⍺,axes ⍵}                        ⍝ type and axes vector
    axes←{(-2⌈⍴⍴⍵)↑1+×⍴⍵}                                              ⍝ array axis types
    open←{16::(1⌈⍴⍵)⍴⊂'[ref]' ⋄ (1⌈⍴⍵)⍴⍵}                              ⍝ exposed null axes
    trim←{(~1 1⍷∧⌿⍵=' ')/⍵}                                            ⍝ removal of extra blank cols
    type←{{(1=⍴⍵)⊃'+'⍵}∪,char¨⍵}                                       ⍝ simple array type
    char←{⍬≡⍴⍵:'─' ⋄ (⊃⍵∊'¯',⎕D)⊃'#~'}∘⍕                               ⍝ simple scalar type

    {                                                                  ⍝ recursively boxed arrays:
        0=≡⍵:' '⍪(open ⎕FMT ⍵)(' '=⊃0⍴⍵)⊃' -'                         ⍝ simple scalar
        1 ⍬≡(≡⍵)(⍴⍵):''(0 0)'∇' 0 0 box ⎕FMT ⍵                         ⍝ object rep: ⎕OR
        1=≡⍵:(deco)box open' ',⎕FMT open ⍵                           ⍝ simple array
        ((⊂⍕≡⍵)deco)box trim' ',⎕FMT ∇¨open ⍵                        ⍝ nested array
    }⍵
}
code_colours

test script

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