# The standard set of gems in nixpkgs including potential fixes.
#
# The gemset is derived from two points of entry:
# - An attrset describing a gem, including version, source and dependencies
#   This is just meta data, most probably automatically generated by a tool
#   like Bundix (https://github.com/aflatter/bundix).
#   {
#     name = "bundler";
#     version = "1.6.5";
#     sha256 = "1s4x0f5by9xs2y24jk6krq5ky7ffkzmxgr4z1nhdykdmpsi2zd0l";
#     dependencies = [ "rake" ];
#   }
# - An optional derivation that may override how the gem is built. For popular
#   gems that don't behave correctly, fixes are already provided in the form of
#   derivations.
#
# This seperates "what to build" (the exact gem versions) from "how to build"
# (to make gems behave if necessary).

{ lib, fetchurl, writeScript, ruby, kerberos, libxml2, libxslt, python, stdenv, which
, libiconv, postgresql, v8_3_16_14, clang, sqlite, zlib, imagemagick
, pkgconfig , ncurses, xapian, gpgme, utillinux, fetchpatch, tzdata, icu, libffi
, cmake, libssh2, openssl, mysql, darwin, git, perl, gecode_3, curl
, libmsgpack, qt48, libsodium, snappy, libossp_uuid, lxc
}@args:

let
  v8 = v8_3_16_14;
in

{
  bundler = attrs:
    let
      templates = "${attrs.ruby.gemPath}/gems/${attrs.gemName}-${attrs.version}/lib/bundler/templates/";
    in {
      # patching shebangs would fail on the templates/Executable file, so we
      # temporarily remove the executable flag.
      preFixup  = "chmod -x $out/${templates}/Executable";
      postFixup = ''
        chmod +x $out/${templates}/Executable

        # Allows to load another bundler version
        sed -i -e "s/activate_bin_path/bin_path/g" $out/bin/bundle
      '';
    };

  capybara-webkit = attrs: {
    buildInputs = [ qt48 ];
  };

  charlock_holmes = attrs: {
    buildInputs = [ which icu zlib ];
  };

  dep-selector-libgecode = attrs: {
    USE_SYSTEM_GECODE = true;
    postInstall = ''
      installPath=$(cat $out/nix-support/gem-meta/install-path)
      sed -i $installPath/lib/dep-selector-libgecode.rb -e 's@VENDORED_GECODE_DIR =.*@VENDORED_GECODE_DIR = "${gecode_3}"@'
    '';
  };

  eventmachine = attrs: {
    buildInputs = [ openssl ];
  };

  ffi = attrs: {
    buildInputs = [ libffi pkgconfig ];
  };

  gpgme = attrs: {
    buildInputs = [ gpgme ];
  };

  hitimes = attrs: {
    buildInputs =
      stdenv.lib.optionals stdenv.isDarwin
        [ darwin.apple_sdk.frameworks.CoreServices ];
  };

  # disable bundle install as it can't install anything in addition to what is
  # specified in pkgs/applications/misc/jekyll/Gemfile anyway. Also do chmod_R
  # to compensate for read-only files in site_template in nix store.
  jekyll = attrs: {
    postInstall = ''
      installPath=$(cat $out/nix-support/gem-meta/install-path)
      sed -i $installPath/lib/jekyll/commands/new.rb \
          -e 's@Exec.run("bundle", "install"@Exec.run("true"@' \
          -e 's@FileUtils.cp_r site_template + "/.", path@FileUtils.cp_r site_template + "/.", path; FileUtils.chmod_R "u+w", path@'
    '';
  };

  # note that you need version >= v3.16.14.8,
  # otherwise the gem will fail to link to the libv8 binary.
  # see: https://github.com/cowboyd/libv8/pull/161
  libv8 = attrs: {
    buildInputs = [ which v8 python ];
    buildFlags = [ "--with-system-v8=true" ];
  };

  msgpack = attrs: {
    buildInputs = [ libmsgpack ];
  };
  
  mysql = attrs: {
    buildInputs = [ mysql.lib zlib openssl ];
  };

  mysql2 = attrs: {
    buildInputs = [ mysql.lib zlib openssl ];
  };

  ncursesw = attrs: {
    buildInputs = [ ncurses ];
    buildFlags = [
      "--with-cflags=-I${ncurses.dev}/include"
      "--with-ldflags=-L${ncurses.out}/lib"
    ];
  };

  nokogiri = attrs: {
    buildFlags = [
      "--use-system-libraries"
      "--with-zlib-dir=${zlib.dev}"
      "--with-xml2-lib=${libxml2.out}/lib"
      "--with-xml2-include=${libxml2.dev}/include/libxml2"
      "--with-xslt-lib=${libxslt.out}/lib"
      "--with-xslt-include=${libxslt.dev}/include"
      "--with-exslt-lib=${libxslt.out}/lib"
      "--with-exslt-include=${libxslt.dev}/include"
    ] ++ lib.optional stdenv.isDarwin "--with-iconv-dir=${libiconv}";
  };

  patron = attrs: {
    buildInputs = [ curl ];
  };

  pg = attrs: {
    buildFlags = [
      "--with-pg-config=${postgresql}/bin/pg_config"
    ];
  };

  puma = attrs: {
    buildInputs = [ openssl ];
  };

  rbnacl = spec: {
    postInstall = ''
    sed -i $(cat $out/nix-support/gem-meta/install-path)/lib/rbnacl.rb -e "2a \
    RBNACL_LIBSODIUM_GEM_LIB_PATH = '${libsodium.out}/lib/libsodium.${if stdenv.isDarwin then "dylib" else "so"}'
    "
    '';
  };

  rmagick = attrs: {
    buildInputs = [ imagemagick pkgconfig which ];
  };

  ruby-lxc = attrs: {
    buildInputs = [ lxc ];
  };

  ruby-terminfo = attrs: {
    buildInputs = [ ncurses ];
    buildFlags = [
      "--with-cflags=-I${ncurses.dev}/include"
      "--with-ldflags=-L${ncurses.out}/lib"
    ];
  };
  rugged = attrs: {
    buildInputs = [ cmake pkgconfig openssl libssh2 zlib ];
  };

  scrypt = attrs:
    if stdenv.isDarwin then {
      dontBuild = false;
      postPatch = ''
        sed -i -e "s/-arch i386//" Rakefile ext/scrypt/Rakefile
      '';
    } else {};

  sequel_pg = attrs: {
    buildInputs = [ postgresql ];
  };

  snappy = attrs: {
    buildInputs = [ args.snappy ];
  };

  sqlite3 = attrs: {
    buildFlags = [
      "--with-sqlite3-include=${sqlite.dev}/include"
      "--with-sqlite3-lib=${sqlite.out}/lib"
    ];
  };

  sup = attrs: {
    dontBuild = false;
    # prevent sup from trying to dynamically install `xapian-ruby`.
    postPatch = ''
      cp ${./mkrf_conf_xapian.rb} ext/mkrf_conf_xapian.rb

      substituteInPlace lib/sup/crypto.rb \
        --replace 'which gpg2' \
                  '${which}/bin/which gpg2'
    '';
  };

  timfel-krb5-auth = attrs: {
    buildInputs = [ kerberos ];
  };

  therubyracer = attrs: {
    buildFlags = [
      "--with-v8-dir=${v8}"
      "--with-v8-include=${v8}/include"
      "--with-v8-lib=${v8}/lib"
    ];
  };

  typhoeus = attrs: {
    buildInputs = [ curl ];
  };

  tzinfo = attrs: {
    dontBuild = false;
    postPatch = ''
      substituteInPlace lib/tzinfo/zoneinfo_data_source.rb \
        --replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
    '';
  };
  
  uuid4r = attrs: {
    buildInputs = [ which libossp_uuid ];
  };

  xapian-ruby = attrs: {
    # use the system xapian
    dontBuild = false;
    buildInputs = [ xapian pkgconfig zlib ];
    postPatch = ''
      cp ${./xapian-Rakefile} Rakefile
    '';
    preInstall = ''
      export XAPIAN_CONFIG=${xapian}/bin/xapian-config
    '';
  };

}