[PATCH] add a Makefile switch to avoid gettext translation in shell scripts

[Alex Riesen <raa.lkml@gmail.com>]

Some systems have gettext.sh (GNU gettext) installed, but it is either broken
or misconfigured in such a way so its output is not usable.
For instance, on this particular system, a Cygwin installations gettext
produces no output whatsoever.

In case the users of these systems are unable or not interested in fixing
them, setting the new Makefile switch should help:

    USE_FALLTHROUGH_GETTEXT_SCHEME=yes

This will replace the translation routines with fallthrough versions, which
currently used only for regression testing.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
---

Alex Riesen, Thu, Jan 19, 2012 10:13:20 +0100:
> On Thu, Jan 19, 2012 at 00:18, Ævar Arnfjörð Bjarmason <avarab@gmail.com> wrote:
> > It makes sense to prefer the system functions by default in both
> > cases, but when the OS one can be broken or lacking we can just add
> > probes or Makefile options like we do for fnmatch() with the
> > NO_FNMATCH_CASEFOLD switch.
> 
> Yes, and I personally shall welcome a chance to insult the local IT
> by suggesting BROKEN_SH_GETTEXT. Not that they get the point...

I believe this patch does just that. It is certainly enough for my purposes.
The copy-paste error noticed by Jonathan is also fixed, thanks!
I didn't add the tracking of the switch in GIT-BUILD-OPTIONS: didn't found
how to do it quickly enough in this time of evening, and gave up, thinking
that no one sane would need to set the option anyway. So at the moment a
"make clean" needed when changing it.

 Makefile       |    4 ++
 git-sh-i18n.sh |  102 +++++++++++++++++++++++++++-----------------------------
 2 files changed, 53 insertions(+), 53 deletions(-)

diff --git a/Makefile b/Makefile
index a782409..806d126 100644
--- a/Makefile
+++ b/Makefile
@@ -47,6 +47,9 @@ all::
 # A translated Git requires GNU libintl or another gettext implementation,
 # plus libintl-perl at runtime.
 #
+# Define USE_FALLTHROUGH_GETTEXT_SCHEME, if you don't want to trust the
+# installed gettext translation of the shell scripts output.
+#
 # Define HAVE_LIBCHARSET_H if you haven't set NO_GETTEXT and you can't
 # trust the langinfo.h's nl_langinfo(CODESET) function to return the
 # current character set. GNU and Solaris have a nl_langinfo(CODESET),
@@ -1887,6 +1890,7 @@ sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
     -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
     -e 's|@@LOCALEDIR@@|$(localedir_SQ)|g' \
     -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
+    -e 's/@@USE_FALLTHROUGH_GETTEXT_SCHEME@@/$(USE_FALLTHROUGH_GETTEXT_SCHEME)/g' \
     -e $(BROKEN_PATH_FIX) \
     $@.sh >$@+
 endef
diff --git a/git-sh-i18n.sh b/git-sh-i18n.sh
index b4575fb..da8b214 100644
--- a/git-sh-i18n.sh
+++ b/git-sh-i18n.sh
@@ -16,61 +16,44 @@ else
 fi
 export TEXTDOMAINDIR
 
-if test -z "$GIT_GETTEXT_POISON"
+GIT_INTERNAL_GETTEXT_SH_SCHEME=fallthrough
+if test -n "@@USE_FALLTHROUGH_GETTEXT_SCHEME@@$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS"
+then
+	: no probing necessary
+elif test -n "$GIT_GETTEXT_POISON"
 then
-	if test -z "$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS" && type gettext.sh >/dev/null 2>&1
-	then
-		# This is GNU libintl's gettext.sh, we don't need to do anything
-		# else than setting up the environment and loading gettext.sh
-		GIT_INTERNAL_GETTEXT_SH_SCHEME=gnu
-		export GIT_INTERNAL_GETTEXT_SH_SCHEME
-
-		# Try to use libintl's gettext.sh, or fall back to English if we
-		# can't.
-		. gettext.sh
-
-	elif test -z "$GIT_INTERNAL_GETTEXT_TEST_FALLBACKS" && test "$(gettext -h 2>&1)" = "-h"
-	then
-		# We don't have gettext.sh, but there's a gettext binary in our
-		# path. This is probably Solaris or something like it which has a
-		# gettext implementation that isn't GNU libintl.
-		GIT_INTERNAL_GETTEXT_SH_SCHEME=solaris
-		export GIT_INTERNAL_GETTEXT_SH_SCHEME
-
-		# Solaris has a gettext(1) but no eval_gettext(1)
-		eval_gettext () {
-			gettext "$1" | (
-				export PATH $(git sh-i18n--envsubst --variables "$1");
-				git sh-i18n--envsubst "$1"
-			)
-		}
-
-	else
-		# Since gettext.sh isn't available we'll have to define our own
-		# dummy pass-through functions.
-
-		# Tell our tests that we don't have the real gettext.sh
-		GIT_INTERNAL_GETTEXT_SH_SCHEME=fallthrough
-		export GIT_INTERNAL_GETTEXT_SH_SCHEME
-
-		gettext () {
-			printf "%s" "$1"
-		}
-
-		eval_gettext () {
-			printf "%s" "$1" | (
-				export PATH $(git sh-i18n--envsubst --variables "$1");
-				git sh-i18n--envsubst "$1"
-			)
-		}
-	fi
-else
-	# Emit garbage under GETTEXT_POISON=YesPlease. Unlike the C tests
-	# this relies on an environment variable
-
 	GIT_INTERNAL_GETTEXT_SH_SCHEME=poison
-	export GIT_INTERNAL_GETTEXT_SH_SCHEME
+elif type gettext.sh >/dev/null 2>&1
+then
+	# This is GNU libintl's gettext.sh, we don't need to do anything
+	# else than setting up the environment and loading gettext.sh
+	GIT_INTERNAL_GETTEXT_SH_SCHEME=gnu
+elif test "$(gettext -h 2>&1)" = "-h"
+then
+	# We don't have gettext.sh, but there's a gettext binary in our
+	# path. This is probably Solaris or something like it which has a
+	# gettext implementation that isn't GNU libintl.
+	GIT_INTERNAL_GETTEXT_SH_SCHEME=solaris
+fi
+export GIT_INTERNAL_GETTEXT_SH_SCHEME
 
+case "$GIT_INTERNAL_GETTEXT_SH_SCHEME" in
+gnu)
+	# Try to use libintl's gettext.sh, or fall back to English if we
+	# can't.
+	. gettext.sh
+	;;
+solaris)
+	# Solaris has a gettext(1) but no eval_gettext(1)
+	eval_gettext () {
+		gettext "$1" | (
+			export PATH $(git sh-i18n--envsubst --variables "$1");
+			git sh-i18n--envsubst "$1"
+		)
+	}
+	;;
+poison)
+	# Used in tests
 	gettext () {
 		printf "%s" "# GETTEXT POISON #"
 	}
@@ -78,7 +61,20 @@ else
 	eval_gettext () {
 		printf "%s" "# GETTEXT POISON #"
 	}
-fi
+	;;
+*)
+	gettext () {
+		printf "%s" "$1"
+	}
+
+	eval_gettext () {
+		printf "%s" "$1" | (
+			export PATH $(git sh-i18n--envsubst --variables "$1");
+			git sh-i18n--envsubst "$1"
+		)
+	}
+	;;
+esac
 
 # Git-specific wrapper functions
 gettextln () {
-- 
1.7.9.rc1.92.ga90a1