nixpkgs/pkgs/development/libraries/glibc/locales.nix

/* This function builds just the `lib/locale/locale-archive' file from
   Glibc and nothing else.  If `allLocales' is true, all supported
   locales are included; otherwise, just the locales listed in
   `locales'.  See localedata/SUPPORTED in the Glibc source tree for
   the list of all supported locales:
   http://sourceware.org/cgi-bin/cvsweb.cgi/libc/localedata/SUPPORTED?cvsroot=glibc
*/

{ stdenv, fetchurl, writeText, allLocales ? true, locales ? ["en_US.UTF-8/UTF-8"] }:

let build = import ./common.nix; in

build null {
  name = "glibc-locales";

  inherit fetchurl stdenv;
  installLocales = true;

  builder = ./locales-builder.sh;

  # Awful hack: `localedef' doesn't allow the path to `locale-archive'
  # to be overriden, but you *can* specify a prefix, i.e. it will use
  # <prefix>/<path-to-glibc>/lib/locale/locale-archive.  So we use
  # $TMPDIR as a prefix, meaning that the locale-archive is placed in
  # $TMPDIR/nix/store/...-glibc-.../lib/locale/locale-archive.
  buildPhase =
    ''
      mkdir -p $TMPDIR/"$(dirname $(readlink -f $(type -p localedef)))/../lib/locale"

      # Hack to allow building of the locales (needed since glibc-2.12)
      sed -i -e 's,^$(rtld-prefix) $(common-objpfx)locale/localedef,localedef --prefix='$TMPDIR',' ../glibc-2*/localedata/Makefile

      ${if allLocales then "" else
          "echo SUPPORTED-LOCALES=\"${toString locales}\" > ../glibc-2*/localedata/SUPPORTED"}

      make localedata/install-locales \
          localedir=$out/lib/locale \
    '';

  installPhase =
    ''
      mkdir -p "$out/lib/locale"
      cp -v "$TMPDIR/$NIX_STORE/"*"/lib/locale/locale-archive" "$out/lib/locale"
    '';

  setupHook = writeText "locales-setup-hook.sh"
    ''
      export LOCALE_ARCHIVE=@out@/lib/locale/locale-archive
    '';

  meta.description = "Locale information for the GNU C Library";
}