app-shells/fish: add nls support

This adds nls useflag and includes
backported upstream patch to honor LINGUAS.
Fixes bug 409969.
Closes: gentoo#4072

app-shells/fish/files/fish-2.5.0-honor-linguas.patch

@@ -0,0 +1,32 @@
+diff --git a/Makefile.in b/Makefile.in
+index 35e63ae..b73c612 100644
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -195,11 +195,16 @@ ifeq ($(shell uname), Darwin)
+ endif
+
+ #
+-# All translation message catalogs
++# All translation message catalogs, filter files based on LINGUAS.
+ #
+ TRANSLATIONS_SRC := $(wildcard po/*.po)
+-ifdef HAVE_GETTEXT
++ifeq ($(HAVE_GETTEXT), 1)
+ TRANSLATIONS := $(TRANSLATIONS_SRC:.po=.gmo)
++ifdef LINGUAS
++ TRANSLATIONS_ALL := $(TRANSLATIONS)
++ TRANSLATIONS_WANTED = $(patsubst %,po/%.gmo,$(LINGUAS))
++ TRANSLATIONS = $(filter $(TRANSLATIONS_WANTED),$(TRANSLATIONS_ALL))
++endif
+ else
+ TRANSLATIONS :=
+ endif
+@@ -764,7 +769,7 @@ uninstall: uninstall-translations | show-prefix show-bindir show-sysconfdir show
+ .PHONY: uninstall
+
+ install-translations: $(TRANSLATIONS) | show-HAVE_GETTEXT
+-ifdef HAVE_GETTEXT
++ifeq ($(HAVE_GETTEXT), 1)
+ @echo "Installing translations..."
+ $v for i in $(TRANSLATIONS); do \
+ $(INSTALL) -m 755 -d $(DESTDIR)$(localedir)/`basename $$i .gmo`/LC_MESSAGES; \

app-shells/fish/fish-2.5.0.ebuild

@@ -10,7 +10,7 @@ SRC_URI="http://fishshell.com/files/${PV}/${P}.tar.gz"
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~amd64 ~ppc ~ppc64 ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x86-macos ~x86-solaris"
-IUSE=""
+IUSE="nls"
 
 RDEPEND="
  >=dev-libs/libpcre2-10.21[pcre32]
@@ -19,17 +19,20 @@ RDEPEND="
 DEPEND="
  ${RDEPEND}
  sys-devel/bc
- sys-devel/gettext
+ nls? ( sys-devel/gettext )
 "
 
+PATCHES=( "${FILESDIR}/${P}-honor-linguas.patch" )
+
 src_configure() {
  # Set things up for fish to be a default shell.
  # It has to be in /bin in case /usr is unavailable.
  # Also, all of its utilities have to be in /bin.
  econf \
  docdir="${EPREFIX}"/usr/share/doc/${PF} \
  --bindir="${EPREFIX}"/bin \
- --without-included-pcre2
+ --without-included-pcre2 \
+ $(use_with nls gettext)
 }
 
 src_test() {