#! /bin/sh
. "${srcdir=.}/init.sh"; path_prepend_ . ../src

# Test of gettext facilities in the C++ language, according to ISO C++ 20.
# Assumes an fr_FR locale is installed.
# Assumes the following packages are installed: gcc g++.

# This test fails if the gettext package was configured with --disable-nls,
# because in this case the gettext-runtime/intl/ directory does not produce
# a <libintl.h> header file.

# This test may also fail with clang 16 or older. See
# https://discourse.llvm.org/t/std-format-not-available-in-libc-15/66137
# https://stackoverflow.com/questions/71777564/

# Test whether a C++ compiler is found.
test "${CXX}" != "no" || {
  echo "Skipping test: no C++ compiler found"
  Exit 77
}

# Try to find compiler option for ISO C++ 20 support.
cat <<\EOF > test.cc
#include <format>
using std::vformat;
using std::make_format_args;
EOF
if ${CXX} ${CXXFLAGS} ${CPPFLAGS} -c test.cc 2>/dev/null; then
  CXX20=
elif ${CXX} ${CXXFLAGS} -std=gnu++20 ${CPPFLAGS} -c test.cc 2>/dev/null; then
  CXX20='-std=gnu++20'
else
  echo "Skipping test: C++ compiler does not support ISO C++ 20"
  Exit 77
fi
CXXFLAGS="${CXXFLAGS} ${CXX20}"

cat <<\EOF > prog.cc
#include "config.h"

#include <format>
#include <iostream>
using namespace std;

#include <libintl.h>
#include <locale.h>
#include <stdlib.h>
#include "xsetenv.h"
#define _(string) gettext (string)

int main (int argc, char *argv[])
{
  int n = atoi (argv[2]);

  xsetenv ("LC_ALL", argv[1], 1);
  if (setlocale (LC_ALL, "") == NULL)
    // Couldn't set locale.
    exit (77);

  textdomain ("prog");
  bindtextdomain ("prog", ".");

  cout << _("'Your command, please?', asked the waiter.") << endl;

  cout << vformat (ngettext ("a piece of cake", "{} pieces of cake", n),
                   make_format_args (n))
       << endl;

  cout << vformat (_("{} is replaced by {}."), make_format_args ("FF", "EUR"))
       << endl;
}
EOF

# Compile in two steps from .cc to .o and from .o to 'prog'. This way,
# relinking is faster because doesn't need to redo the first step.
# Put the -I flags before ${CXXFLAGS} ${CPPFLAGS}, to make sure that libintl.h
# is found in the build directory, regardless of -I options present in
# ${CXXFLAGS} or ${CPPFLAGS}.
${CXX} -I../.. -I"$abs_top_srcdir"/gnulib-lib -I../../../gettext-runtime/intl ${CXXFLAGS} ${CPPFLAGS} -c prog.cc \
  || Exit 1
# Remove the -Wl,--disable-auto-import option here that is added by
# woe32-dll.m4. Cygwin 1.7.2 does not support it in C++ mode: It gives
# a link error about 'std::cout'.
: ${CONFIG_SHELL=${SHELL-/bin/sh}}
${CONFIG_SHELL} "$top_builddir"/libtool --quiet --tag=CXX --mode=link \
  ${CXX} ${CXXFLAGS} `echo "X ${LDFLAGS} " | sed -e 's/^X//' -e 's/ -Wl,--disable-auto-import / /'` -o prog prog.${OBJEXT} \
         ../../gnulib-lib/libgettextlib.la ${LTLIBINTL} \
  || Exit 1

: ${XGETTEXT=xgettext}
${XGETTEXT} -o prog.tmp --omit-header --no-location -k_ prog.cc || Exit 1
LC_ALL=C tr -d '\r' < prog.tmp > prog.pot || Exit 1

cat <<EOF > prog.ok
msgid "'Your command, please?', asked the waiter."
msgstr ""

#, c++-format
msgid "a piece of cake"
msgid_plural "{} pieces of cake"
msgstr[0] ""
msgstr[1] ""

#, c++-format
msgid "{} is replaced by {}."
msgstr ""
EOF

: ${DIFF=diff}
${DIFF} prog.ok prog.pot || Exit 1

cat <<\EOF > fr.po
msgid ""
msgstr ""
"Content-Type: text/plain; charset=ISO-8859-1\n"
"Plural-Forms: nplurals=2; plural=(n > 1);\n"

msgid "'Your command, please?', asked the waiter."
msgstr "«Votre commande, s'il vous plait», dit le garçon."

# Les gateaux allemands sont les meilleurs du monde.
#, c++-format
msgid "a piece of cake"
msgid_plural "{} pieces of cake"
msgstr[0] "un morceau de gateau"
msgstr[1] "{} morceaux de gateau"

# Reverse the arguments.
#, c++-format
msgid "{} is replaced by {}."
msgstr "{1} remplace {0}."
EOF

: ${MSGMERGE=msgmerge}
${MSGMERGE} -q -o fr.po.tmp fr.po prog.pot || Exit 1
LC_ALL=C tr -d '\r' < fr.po.tmp > fr.po.new || Exit 1

: ${DIFF=diff}
${DIFF} fr.po fr.po.new || Exit 1

test -d fr || mkdir fr
test -d fr/LC_MESSAGES || mkdir fr/LC_MESSAGES

: ${MSGFMT=msgfmt}
${MSGFMT} -o fr/LC_MESSAGES/prog.mo fr.po

: ${DIFF=diff}
cat <<\EOF > prog.ok
«Votre commande, s'il vous plait», dit le garçon.
2 morceaux de gateau
EUR remplace FF.
EOF
cat <<\EOF > prog.oku
«Votre commande, s'il vous plait», dit le garçon.
2 morceaux de gateau
EUR remplace FF.
EOF

: ${LOCALE_FR=fr_FR}
: ${LOCALE_FR_UTF8=fr_FR.UTF-8}
if test $LOCALE_FR != none; then
  prepare_locale_ fr $LOCALE_FR
  LANGUAGE= ./prog $LOCALE_FR 2 > prog.tmp
  case $? in
    0) case "$host_os" in
         mingw*) LC_ALL=C tr -d '\r' < prog.tmp > prog.out || Exit 1 ;;
         *) cp prog.tmp prog.out || Exit 1 ;;
       esac
       ${DIFF} prog.ok prog.out || Exit 1;;
    77) LOCALE_FR=none;;
    *) Exit 1;;
  esac
fi
if test $LOCALE_FR_UTF8 != none; then
  prepare_locale_ fr $LOCALE_FR_UTF8
  LANGUAGE= ./prog $LOCALE_FR_UTF8 2 > prog.tmp
  case $? in
    0) case "$host_os" in
         mingw*) LC_ALL=C tr -d '\r' < prog.tmp > prog.out || Exit 1 ;;
         *) cp prog.tmp prog.out || Exit 1 ;;
       esac
       ${DIFF} prog.oku prog.out || Exit 1;;
    77) LOCALE_FR_UTF8=none;;
    *) Exit 1;;
  esac
fi
if test $LOCALE_FR = none && test $LOCALE_FR_UTF8 = none; then
  if test -f /usr/bin/localedef; then
    echo "Skipping test: no french locale is installed"
  else
    echo "Skipping test: no french locale is supported"
  fi
  Exit 77
fi

Exit 0