[libsecret/wip/nielsdg/intltool2gettxt: 5/5] Migrate from intltool to gettext.

[Daiki Ueno <dueno src gnome org>]

commit f25420d5aadc1449f78c9293d0b1ddf16f5d2eba
Author: Niels De Graef <Niels DeGraef barco com>
Date:   Fri Jun 8 22:50:09 2018 +0200

    Migrate from intltool to gettext.

 autogen.sh   |  3 ++-
 configure.ac | 10 ++++----
 po/Makevars  | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+), 5 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 5f0d120..360f36c 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -91,7 +91,8 @@ touch README INSTALL
 $ACLOCAL -I build/m4 $ACLOCAL_FLAGS || exit $?
 
 libtoolize --force || exit $?
-intltoolize --force --copy || exit $?
+
+autopoint --force || exit $?
 
 gtkdocize || exit $?
 
diff --git a/configure.ac b/configure.ac
index e527ed4..c4d2b89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,8 +13,6 @@ GLIB_REQ=2.38.0
 GLIB_MIN=GLIB_VERSION_2_38
 GLIB_MAX=GLIB_VERSION_2_38
 
-INTLTOOL_REQ=0.35.0
-
 # Optional
 
 VALA_WANT=0.17.2.12
@@ -65,13 +63,17 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AM_PROG_LIBTOOL
-IT_PROG_INTLTOOL($INTLTOOL_REQ)
 PKG_PROG_PKG_CONFIG
 
+# --------------------------------------------------------------------
+# i18n
+
+AM_GNU_GETTEXT([external])
+AM_GNU_GETTEXT_VERSION([0.19.8])
+
 GETTEXT_PACKAGE=libsecret
 AC_SUBST([GETTEXT_PACKAGE])
 AC_DEFINE_UNQUOTED([GETTEXT_PACKAGE],["$GETTEXT_PACKAGE"],[The gettext domain name])
-AM_GLIB_GNU_GETTEXT
 
 # --------------------------------------------------------------------
 # Checks for functions
diff --git a/po/Makevars b/po/Makevars
new file mode 100644
index 0000000..97903a4
--- /dev/null
+++ b/po/Makevars
@@ -0,0 +1,78 @@
+# Makefile variables for PO directory in any package using GNU gettext.
+
+# Usually the message domain is the same as the package name.
+DOMAIN = $(PACKAGE)
+
+# These two variables depend on the location of this directory.
+subdir = po
+top_builddir = ..
+
+# These options get passed to xgettext.
+XGETTEXT_OPTIONS = --from-code=UTF-8 --keyword=_ --keyword=N_ --keyword=C_:1c,2 --keyword=NC_:1c,2 
--keyword=g_dngettext:2,3 --add-comments
+
+# This is the copyright holder that gets inserted into the header of the
+# $(DOMAIN).pot file.  Set this to the copyright holder of the surrounding
+# package.  (Note that the msgstr strings, extracted from the package's
+# sources, belong to the copyright holder of the package.)  Translators are
+# expected to transfer the copyright for their translations to this person
+# or entity, or to disclaim their copyright.  The empty string stands for
+# the public domain; in this case the translators are expected to disclaim
+# their copyright.
+COPYRIGHT_HOLDER = libsecret contributors
+
+# This tells whether or not to prepend "GNU " prefix to the package
+# name that gets inserted into the header of the $(DOMAIN).pot file.
+# Possible values are "yes", "no", or empty.  If it is empty, try to
+# detect it automatically by scanning the files in $(top_srcdir) for
+# "GNU packagename" string.
+PACKAGE_GNU = no
+
+# This is the email address or URL to which the translators shall report
+# bugs in the untranslated strings:
+# - Strings which are not entire sentences, see the maintainer guidelines
+#   in the GNU gettext documentation, section 'Preparing Strings'.
+# - Strings which use unclear terms or require additional context to be
+#   understood.
+# - Strings which make invalid assumptions about notation of date, time or
+#   money.
+# - Pluralisation problems.
+# - Incorrect English spelling.
+# - Incorrect formatting.
+# It can be your email address, or a mailing list address where translators
+# can write to without being subscribed, or the URL of a web page through
+# which the translators can contact you.
+MSGID_BUGS_ADDRESS = https://gitlab.gnome.org/GNOME/libsecret/issues
+
+# This is the list of locale categories, beyond LC_MESSAGES, for which the
+# message catalogs shall be used.  It is usually empty.
+EXTRA_LOCALE_CATEGORIES =
+
+# This tells whether the $(DOMAIN).pot file contains messages with an 'msgctxt'
+# context.  Possible values are "yes" and "no".  Set this to yes if the
+# package uses functions taking also a message context, like pgettext(), or
+# if in $(XGETTEXT_OPTIONS) you define keywords with a context argument.
+USE_MSGCTXT = yes
+
+# These options get passed to msgmerge.
+# Useful options are in particular:
+#   --previous            to keep previous msgids of translated messages,
+#   --quiet               to reduce the verbosity.
+MSGMERGE_OPTIONS =
+
+# These options get passed to msginit.
+# If you want to disable line wrapping when writing PO files, add
+# --no-wrap to MSGMERGE_OPTIONS, XGETTEXT_OPTIONS, and
+# MSGINIT_OPTIONS.
+MSGINIT_OPTIONS =
+
+# This tells whether or not to regenerate a PO file when $(DOMAIN).pot
+# has changed.  Possible values are "yes" and "no".  Set this to no if
+# the POT file is checked in the repository and the version control
+# program ignores timestamps.
+PO_DEPENDS_ON_POT = no
+
+# This tells whether or not to forcibly update $(DOMAIN).pot and
+# regenerate PO files on "make dist".  Possible values are "yes" and
+# "no".  Set this to no if the POT file and PO files are maintained
+# externally.
+DIST_DEPENDS_ON_UPDATE_PO = no