Build: Add support for translated man pages using po4a.

The dependency on po4a is optional. It's never required to install
the translated man pages when xz is built from a release tarball.
If po4a is missing when building from xz.git, the translated man
pages won't be generated but otherwise the build will work normally.

The translations are only updated automatically by autogen.sh and
by "make mydist". This makes it easy to keep po4a as an optional
dependency and ensures that I won't forget to put updated
translations to a release tarball.

The translated man pages aren't installed if --disable-nls is used.

The installation of translated man pages abuses Automake internals
by calling "install-man" with redefined dist_man_MANS and man_MANS.
This makes the hairy script code slightly less hairy. If it breaks
some day, this code needs to be fixed; don't blame Automake developers.

Also, this adds more quotes to the existing shell script code in
the Makefile.am "-hook"s.

1 files changed, 36 insertions, 14 deletions

diff --git a/src/xz/Makefile.am b/src/xz/Makefile.am
index 0890aad7..4bc64f36 100644
--- a/src/xz/Makefile.am
+++ b/src/xz/Makefile.am
@@ -81,31 +81,53 @@ xzlinks += lzma unlzma lzcat
 endif
 
 install-exec-hook:
-	cd $(DESTDIR)$(bindir) && \
+	cd "$(DESTDIR)$(bindir)" && \
 	target=`echo xz | sed '$(transform)'`$(EXEEXT) && \
 	for name in $(xzlinks); do \
 		link=`echo $$name | sed '$(transform)'`$(LN_EXEEXT) && \
-		rm -f $$link && \
-		$(LN_S) $$target $$link; \
+		rm -f "$$link" && \
+		$(LN_S) "$$target" "$$link"; \
 	done
 
+# The installation of translated man pages abuses Automake internals
+# by calling "install-man" with redefined dist_man_MANS and man_MANS.
+# If this breaks some day, don't blame Automake developers.
 install-data-hook:
-	cd $(DESTDIR)$(mandir)/man1 && \
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
 	target=`echo xz | sed '$(transform)'` && \
-	for name in $(xzlinks); do \
-		link=`echo $$name | sed '$(transform)'` && \
-		rm -f $$link.1 && \
-		$(LN_S) $$target.1 $$link.1; \
+	for lang in . $$languages; do \
+		man="$(top_srcdir)/po4a/man/$$lang/xz.1" ; \
+		if test -f "$$man"; then \
+			$(MAKE) dist_man_MANS="$$man" man_MANS= \
+				mandir="$(mandir)/$$lang" install-man; \
+		fi; \
+		man1dir="$(DESTDIR)$(mandir)/$$lang/man1" && \
+		if test -f "$$man1dir/$$target.1"; then ( \
+			cd "$$man1dir" && \
+			for name in $(xzlinks); do \
+				link=`echo $$name | sed '$(transform)'` && \
+				rm -f "$$link.1" && \
+				$(LN_S) "$$target.1" "$$link.1"; \
+			done \
+		); fi; \
 	done
 
 uninstall-hook:
-	cd $(DESTDIR)$(bindir) && \
+	cd "$(DESTDIR)$(bindir)" && \
 	for name in $(xzlinks); do \
 		link=`echo $$name | sed '$(transform)'`$(LN_EXEEXT) && \
-		rm -f $$link; \
+		rm -f "$$link"; \
 	done
-	cd $(DESTDIR)$(mandir)/man1 && \
-	for name in $(xzlinks); do \
-		link=`echo $$name | sed '$(transform)'` && \
-		rm -f $$link.1; \
+	languages= ; \
+	if test "$(USE_NLS)" = yes && test -d "$(top_srcdir)/po4a/man"; then \
+		languages=`ls "$(top_srcdir)/po4a/man"`; \
+	fi; \
+	for lang in . $$languages; do \
+		for name in xz $(xzlinks); do \
+			name=`echo $$name | sed '$(transform)'` && \
+			rm -f "$(DESTDIR)$(mandir)/$$lang/man1/$$name.1"; \
+		done; \
 	done