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{ nixpkgs ? import <nixpkgs> { }, overlays ? [ ] }:

let
  inherit (nixpkgs) fetchurl callPackage;

  bionix = nixpkgs.lib.makeExtensible (self:
    let callBionix = file: attrs: import file ({ bionix = self; } // attrs);
    in with self; {
      callBionix = callBionix;
      id = x: x;
      exec = f: x: y: f x y;
      exec' = f: exec (_: f) { };
      exec'' = f: exec' (_: f) { };
      callBionixE = p: exec (callBionix p);

      types = callBionix ./lib/types.nix { };
      fetchgdrive = callBionix ./lib/google.nix { };

      bowtie = callBionix ./tools/bowtie.nix { };
      bwa = callBionix ./tools/bwa.nix { };
      cnvkit = callBionix ./tools/cnvkit.nix { };
      compression = callBionix ./tools/compression.nix { };
      crumble = callBionix ./tools/crumble.nix { };
      facets = callBionix ./tools/facets.nix { };
      fastqc = callBionix ./tools/fastqc.nix { };
      gridss = callBionix ./tools/gridss.nix { };
      infercnv = callBionix ./tools/infercnv.nix { };
      kallisto = callBionix ./tools/kallisto.nix { };
      mosdepth = callBionix ./tools/mosdepth.nix { };
      mutect = callBionix ./tools/mutect.nix { };
      minimap2 = callBionix ./tools/minimap2.nix { };
      picard = callBionix ./tools/picard.nix { };
      platypus = callBionix ./tools/platypus.nix { };
      ref = callBionix ./lib/references.nix { };
      samtools = callBionix ./tools/samtools.nix { };
      sambamba = callBionix ./tools/sambamba.nix { };
      snap = callBionix ./tools/snap.nix { };
      snpeff = callBionix ./tools/snpeff.nix { };
      strelka = callBionix ./tools/strelka.nix { };
      ascat = callBionix ./tools/ascat.nix { };
      fastp = callBionix ./tools/fastp.nix { };
      octopus = callBionix ./tools/octopus.nix { };
      snver = callBionix ./tools/snver.nix { };
      hisat2 = callBionix ./tools/hisat2.nix { };
      xenomapper = callBionix ./tools/xenomapper.nix { };
      manta = callBionix ./tools/manta.nix { };
      delly = callBionix ./tools/delly.nix { };
      lumpy = callBionix ./tools/lumpy.nix { };
      lastal = callBionix ./tools/last.nix { };
      whisper = callBionix ./tools/whisper.nix { };
      star = callBionix ./tools/star.nix { };

      slurm = attrs:
        bionix.extend (self: super:
          with self; rec {
            slurmDefs = {
              ppn = 1;
              mem = 1;
              walltime = "24:00:00";
              partition = null;
              slurmFlags = null;
              salloc = "/usr/bin/salloc";
              srun = "/usr/bin/srun";
            } // attrs;
            slurm = attrs:
              (callPackage ./lib/slurm.nix { }) (slurmDefs // attrs);
            exec = f: x: y:
              slurm (builtins.intersectAttrs slurmDefs x) (super.exec f
                (builtins.removeAttrs x (builtins.attrNames slurmDefs)) y);
          });
      qsub = attrs:
        bionix.extend (self: super:
          with self; rec {
            qsubDefs = {
              ppn = 1;
              mem = 1;
              walltime = "24:00:00";
              tmpDir = "/tmp";
              sleepTime = 60;
              queue = null;
              qsubFlags = null;
              qsubPath = "/usr/bin";
            } // attrs;
            qsub = attrs: (callPackage ./lib/qsub.nix { }) (qsubDefs // attrs);
            exec = f: x: y:
              qsub (builtins.intersectAttrs qsubDefs x) (super.exec f
                (builtins.removeAttrs x (builtins.attrNames qsubDefs)) y);
          });
      def = f: defs: attrs: f (defs // attrs);

      linkOutputs = x:
        with lib;
        nixpkgs.stdenvNoCC.mkDerivation {
          name = "link-outputs";
          outputs = [ "out" ] ++ attrNames x;
          nativeBuildInputs = [ pkgs.perl ];
          buildCommand = let
            recurse = x:
              if x ? type && x.type == "derivation" then
                x
              else if builtins.typeOf x == "set" then
                linkOutputs x
              else
                abort "linkOutputs: unsupported type";
            link = dst: src: ''
              ln -s ${recurse src} $(perl -e 'print $ENV{"${dst}"}') ; ln -s ${
                recurse src
              } $out/${dst}
            '';
          in ''
            mkdir $out 
          '' + (concatStringsSep "\n" (mapAttrsToList link x));
        };

      # Fetching files of specific type
      fetchFastQ = attrs:
        with types;
        tagFiletype (filetype.fq { }) (fetchurl attrs);
      fetchFastA = attrs:
        with types;
        tagFiletype (filetype.fa { }) (fetchurl attrs);
      fetchFastQGZ = attrs:
        with types;
        tagFiletype (filetype.gz (filetype.fq { })) (fetchurl attrs);
      fetchFastAGZ = attrs:
        with types;
        tagFiletype (filetype.gz (filetype.fa { })) (fetchurl attrs);

      # Turn a multi-output derivation into a list of derivations
      outputDrvs = drv: map (o: lib.getAttr o drv) drv.outputs;

      # Export nixpkgs and standard library lib
      pkgs = nixpkgs;
      lib = nixpkgs.lib // {
        types = types;
        shard = callBionix ./lib/shard.nix { };
      };
      stage = x@{ name, stripStorePaths ? true, multicore ? false, ... }:
        (if stripStorePaths then strip else x: x)
        (nixpkgs.stdenvNoCC.mkDerivation (x // {
          name = "bionix-" + name;
          inherit multicore;
        }));
      strip = drv:
        let
          stripCommand = ''

            function rewrite {
              sed -i 's|[A-Za-z0-9+/]\{32\}-bionix|00000000000000000000000000000000-bionix|g' $1
            }
            function rewriteOutput {
              if [ -f ''${!1} ] ; then
                rewrite ''${!1}
              else
                for f in $(find ''${!1} -type f) ; do
                  rewrite $f
                done
              fi
            }
            for o in $outputs ; do
              rewriteOutput $o
            done
          '';
        in drv.overrideAttrs (attrs:
          if attrs ? buildCommand then {
            buildCommand = attrs.buildCommand + stripCommand;
          } else {
            fixupPhase = (if attrs ? fixupPhase then attrs.fixupPhase else "")
              + stripCommand;
          });

      # splitting/joining
      splitFile = file: drv:
        stage {
          name = "split-${file}";
          buildCommand = "ln -s ${drv}/${file} $out";
        };
      split = drv: lib.mapAttrs (p: _: splitFile p drv) (builtins.readDir drv);
      join = drvs:
        stage {
          name = "join";
          buildCommand = ''
            mkdir $out
            ${builtins.concatStringsSep "\n" (builtins.attrValues
              (lib.mapAttrs (n: d: "ln -s ${d} $out/${n}") drvs))}
          '';
        };
      each = f: drv: join (lib.mapAttrs (_: f) (split drv));
    });

  overlayByType = {
    lambda = bionix: overlay:
      bionix.extend
      (self: super: nixpkgs.lib.recursiveUpdate super (overlay self super));
    path = bionix: path: overlay bionix (import path);
  };
  overlay = bionix: overlay:
    let overlayType = builtins.typeOf overlay;
    in if overlayByType ? ${overlayType} then
      overlayByType.${overlayType} bionix overlay
    else
      builtins.throw ("cannot overlay type " + overlayType);
in with nixpkgs.lib; foldl overlay bionix overlays