Description:
Helper to export gnulib-tool local-dir settings to Automake and distribute
files automatically.

configure.ac:
m4_set_add([DX_GNULIB_LOCAL_DIST], [modules/gnulib-local])dnl
AC_REQUIRE([AC_PROG_AWK])dnl
m4_pushdef([gl_LOCAL_DIR],
  [m4_define([_DX_GNULIB_LOCAL_DIR_], $][@)])m4_divert_push([KILL])
m4_include([m4/gnulib-cache.m4])
m4_popdef([gl_LOCAL_DIR])m4_divert_pop([KILL])dnl
AC_SUBST([DX_GNULIB_LOCAL_DIR], m4_defn([_DX_GNULIB_LOCAL_DIR_]))

AC_CONFIG_COMMANDS_PRE([AC_SUBST([DX_GNULIB_LOCAL_DIST],
  ["m4_set_dump([DX_GNULIB_LOCAL_DIST], [ ])"])])

Makefile.am:
DX_GNULIB_LOCAL_DIRS_AWK = \
	{ for (i=1; i<=NF; i++) { sub(/\/[^\/]*$$/, "", $$i); dirs[$$i]=1; } } \
	END { for (i in dirs) print outdir "/" i; }

dist-hook: dist-gnulib-local
dist-gnulib-local:
	save_IFS=$$IFS; \
	IFS=:; set x $(DX_GNULIB_LOCAL_DIR); shift; \
	IFS=$$save_IFS; \
	outdir="$(top_distdir)/$$1"; \
	dirs=`echo $(DX_GNULIB_LOCAL_DIST) \
	      | $(AWK) '$(DX_GNULIB_LOCAL_DIRS_AWK)' outdir="$$outdir"`; \
	( set -x; $(MKDIR_P) $$dirs && chmod u+w $$dirs ) || exit; \
	for f in $(DX_GNULIB_LOCAL_DIST); do \
	  for indir; do \
	    test -f "$(top_srcdir)/$$indir/$$f" || continue; \
	    ( set -x; cp -p "$(top_srcdir)/$$indir/$$f" "$$outdir/$$f" ) || exit; \
	    break; \
	  done; \
	done
.PHONY: dist-gnulib-local