{ lib, stdenv, coqPackages, coq, which, fetchzip, fetchurl }@args:

let
  lib = import ./extra-lib.nix {
    inherit (args) lib;
  };

  inherit (lib)
    concatStringsSep
    flip
    foldl
    isFunction
    isString
    optional
    optionalAttrs
    optionals
    optionalString
    pred
    remove
    switch
    versions
    ;

  inherit (lib.attrsets) removeAttrs;
  inherit (lib.strings) match;

  isGitHubDomain = d: match "^github.*" d != null;
  isGitLabDomain = d: match "^gitlab.*" d != null;
in

{ pname,
  version ? null,
  fetcher ? null,
  owner ? "coq-community",
  domain ? "github.com",
  repo ? pname,
  defaultVersion ? null,
  releaseRev ? (v: v),
  displayVersion ? {},
  release ? {},
  buildInputs ? [],
  nativeBuildInputs ? [],
  extraBuildInputs ? [],
  extraNativeBuildInputs ? [],
  overrideBuildInputs ? [],
  overrideNativeBuildInputs ? [],
  namePrefix ? [ "coq" ],
  enableParallelBuilding ? true,
  extraInstallFlags ? [],
  setCOQBIN ? true,
  mlPlugin ? false,
  useMelquiondRemake ? null,
  dropAttrs ? [],
  keepAttrs ? [],
  dropDerivationAttrs ? [],
  useDuneifVersion ? (x: false),
  useDune ? false,
  opam-name ? (concatStringsSep "-" (namePrefix ++ [ pname ])),
  ...
}@args:
let
  args-to-remove = foldl (flip remove) ([
    "version" "fetcher" "repo" "owner" "domain" "releaseRev"
    "displayVersion" "defaultVersion" "useMelquiondRemake"
    "release"
    "buildInputs" "nativeBuildInputs"
    "extraBuildInputs" "extraNativeBuildInputs"
    "overrideBuildInputs" "overrideNativeBuildInputs"
    "namePrefix"
    "meta" "useDuneifVersion" "useDune" "opam-name"
    "extraInstallFlags" "setCOQBIN" "mlPlugin"
    "dropAttrs" "dropDerivationAttrs" "keepAttrs" ] ++ dropAttrs) keepAttrs;
  fetch = import ../coq/meta-fetch/default.nix
    { inherit lib stdenv fetchzip fetchurl; } ({
      inherit release releaseRev;
      location = { inherit domain owner repo; };
    } // optionalAttrs (args?fetcher) {inherit fetcher;});
  fetched = fetch (if version != null then version else defaultVersion);
  display-pkg = n: sep: v:
    let d = displayVersion.${n} or (if sep == "" then ".." else true); in
    n + optionalString (v != "" && v != null) (switch d [
      { case = true;       out = sep + v; }
      { case = ".";        out = sep + versions.major v; }
      { case = "..";       out = sep + versions.majorMinor v; }
      { case = "...";      out = sep + versions.majorMinorPatch v; }
      { case = isFunction; out = optionalString (d v != "") (sep + d v); }
      { case = isString;   out = optionalString (d != "") (sep + d); }
    ] "") + optionalString (v == null) "-broken";
  append-version = p: n: p + display-pkg n "" coqPackages.${n}.version + "-";
  prefix-name = foldl append-version "" namePrefix;
  useDune = args.useDune or (useDuneifVersion fetched.version);
  coqlib-flags = switch coq.coq-version [
    { case = v: versions.isLe "8.6" v && v != "dev" ;
      out = [ "COQLIB=$(out)/lib/coq/${coq.coq-version}/" ]; }
  ] [ "COQLIBINSTALL=$(out)/lib/coq/${coq.coq-version}/user-contrib"
      "COQPLUGININSTALL=$(OCAMLFIND_DESTDIR)" ];
  docdir-flags = switch coq.coq-version [
    { case = v: versions.isLe "8.6" v && v != "dev";
      out = [ "DOCDIR=$(out)/share/coq/${coq.coq-version}/" ]; }
  ] [ "COQDOCINSTALL=$(out)/share/coq/${coq.coq-version}/user-contrib" ];
in

stdenv.mkDerivation (removeAttrs ({

  name = prefix-name + (display-pkg pname "-" fetched.version);

  inherit (fetched) version src;

  nativeBuildInputs = args.overrideNativeBuildInputs
    or ([ which ]
        ++ optional useDune coq.ocamlPackages.dune_3
        ++ optionals (useDune || mlPlugin) [ coq.ocamlPackages.ocaml coq.ocamlPackages.findlib ]
        ++ (args.nativeBuildInputs or []) ++ extraNativeBuildInputs);
  buildInputs = args.overrideBuildInputs
    or ([ coq ] ++ (args.buildInputs or []) ++ extraBuildInputs);
  inherit enableParallelBuilding;

  meta = ({ platforms = coq.meta.platforms; } //
    (switch domain [{
        case = pred.union isGitHubDomain isGitLabDomain;
        out = { homepage = "https://${domain}/${owner}/${repo}"; };
      }] {}) //
    optionalAttrs (fetched.broken or false) { coqFilter = true; broken = true; }) //
    (args.meta or {}) ;

}
// (optionalAttrs setCOQBIN { COQBIN = "${coq}/bin/"; })
// (optionalAttrs (!args?installPhase && !args?useMelquiondRemake) {
  installFlags =
    coqlib-flags ++ docdir-flags ++
    extraInstallFlags;
})
// (optionalAttrs useDune {
  buildPhase = ''
    runHook preBuild
    dune build -p ${opam-name} ''${enableParallelBuilding:+-j $NIX_BUILD_CORES}
    runHook postBuild
  '';
  installPhase = ''
    runHook preInstall
    dune install --prefix=$out --libdir $OCAMLFIND_DESTDIR ${opam-name}
    mkdir $out/lib/coq/
    mv $OCAMLFIND_DESTDIR/coq $out/lib/coq/${coq.coq-version}
    runHook postInstall
  '';
})
// (optionalAttrs (args?useMelquiondRemake) rec {
  COQUSERCONTRIB = "$out/lib/coq/${coq.coq-version}/user-contrib";
  preConfigurePhases = [ "autoconf" ];
  configureFlags = [ "--libdir=${COQUSERCONTRIB}/${useMelquiondRemake.logpath or ""}" ];
  buildPhase = "./remake -j$NIX_BUILD_CORES";
  installPhase = "./remake install";
})
// (removeAttrs args args-to-remove)) dropDerivationAttrs)
