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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

Path: gap4r8 / pkg / XMod-2.64 / lib / hap.gi
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#############################################################################
##
#W  hap.gi                    GAP4 package `XMod'               Chris Wensley
#W                                                              
#Y  Copyright (C) 2001-2017, Chris Wensley et al,  
#Y  School of Computer Science, Bangor University, U.K. 

##############################################################################
##
#M  HapToXMod( <cat1> )
##  
InstallMethod( HapToXMod, "for a HAP cat1-group", true, 
    [ IsHapCatOneGroupRep ], 0,
function( G )

    local  S, R, tm, hm, t, h, e, C;

    tm := G!.sourceMap; 
    hm := G!.targetMap; 
    S := Source( tm ); 
    R := Image( tm );
    if not ( Image( hm ) = R ) then 
        Error( "source and target maps do not have the same image" ); 
    fi; 
    t := GeneralRestrictedMapping( tm, S, R ); 
    h := GeneralRestrictedMapping( hm, S, R ); 
    e := InclusionMappingGroups( S, R ); 
    C := PreCat1GroupByTailHeadEmbedding( t, h, e ); 
    SetCatOneGroupXModVersion( G, C ); 
    SetCat1GroupHapVersion( C, G ); 
    return C; 
end ); 

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#E  hap.gi  . . . . . . . . . . . . . . . . . . . . . . . . . . . . ends here