Make desktop file translatable

Changes bootstrap script to run libtoolize. Some extra magic was needed for
autoreconf (taken from GNOME projects).
The INTLTOOL_DESKTOP_RULE should be used in Makefile.am but is unfortunately
broken at this time for out-of-source builds. The rule is instead copied and
fixed in Makefile.am.

Makefile.am

@@ -26,8 +26,8 @@ _UBUNTU_MONO_LIGHT_FILES = \
 	data/icons/ubuntu-mono-light/scalable/apps/redshift-status-on.svg \
 	data/icons/ubuntu-mono-light/scalable/apps/redshift-status-off.svg
 
-_DESKTOP_FILES = \
-	data/applications/redshift-gtk.desktop
+DESKTOP_IN_FILES = \
+	data/applications/redshift-gtk.desktop.in
 
 SYSTEMD_USER_UNIT_IN_FILES = \
 	data/systemd/redshift.service.in \
@@ -52,7 +52,7 @@ endif
 # Desktop file
 if ENABLE_GUI
 desktopdir = @datadir@/applications
-desktop_DATA = $(_DESKTOP_FILES)
+desktop_DATA = $(DESKTOP_IN_FILES:.desktop.in=.desktop)
 endif
 
 if ENABLE_GUI
@@ -61,6 +61,12 @@ install-data-hook:
 
 uninstall-hook:
 	$(UPDATE_ICON_CACHE);
+
+# We would preferable use @INTLTOOL_DESKTOP_RULE@ here but
+# sadly it is broken for out-of-tree builds.
+%.desktop: %.desktop.in $(INTLTOOL_MERGE) $(wildcard $(top_srcdir)/po/*.po)
+	$(AM_V_GEN)$(MKDIR_P) $(@D);
+	$(INTLTOOL_V_MERGE)LC_ALL=C $(INTLTOOL_MERGE) $(INTLTOOL_V_MERGE_OPTIONS) -d -u -c $(top_builddir)/po/.intltool-merge-cache $(top_srcdir)/po $< $@
 endif
 
 

bootstrap

@@ -3,4 +3,5 @@
 # change to root directory
 cd $(dirname "$0")
 
-autoreconf --force --install
+autopoint --force && \
+	AUTOPOINT="intltoolize --automake --copy" autoreconf --force --install --verbose

configure.ac

@@ -11,6 +11,7 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 # Checks for programs.
 AC_PROG_CC_C99
+AC_PROG_INTLTOOL([0.50])
 
 # Checks for libraries.
 AM_GNU_GETTEXT_VERSION([0.17])

data/applications/redshift-gtk.desktop.in

@@ -1,8 +1,8 @@
 [Desktop Entry]
 Version=1.0
-Name=Redshift
-GenericName=Color temperature adjustment
-Comment=Color temperature adjustment tool
+_Name=Redshift
+_GenericName=Color temperature adjustment
+_Comment=Color temperature adjustment tool
 Exec=redshift-gtk
 Icon=redshift
 Terminal=false

po/POTFILES.in

@@ -1,5 +1,7 @@
 # List of source files containing translatable strings
 
+data/applications/redshift-gtk.desktop.in
+
 src/redshift.c
 
 src/config-ini.c