add support for gnulib

On a system with up-to-date GNU tools, this does not change
the size of nano's binary.

We start off with importing only a few modules, although we
don't yet delete the fallback logic for them.

.gitignore

@@ -16,6 +16,7 @@ core
 /ABOUT-NLS
 /INSTALL
 /aclocal.m4
+/ar-lib
 /autom4te.cache
 /compile
 /config.cache
@@ -68,6 +69,13 @@ core
 /m4/wint_t.m4
 /m4/xsize.m4
 
+# gnulib entries
+/gnulib/
+/lib/
+/m4/.gitignore
+/m4/gnulib-cache.m4
+/snippet/
+
 /nano.spec
 /src/nano
 /src/revision.h

Makefile.am

@@ -1,6 +1,6 @@
 AUTOMAKE_OPTIONS = gnu no-dependencies
 
-SUBDIRS = doc m4 po src
+SUBDIRS = doc lib m4 po src
 
 if USE_COLOR
 SUBDIRS += syntax

autogen.sh

@@ -1,4 +1,30 @@
 #!/bin/sh
 # Generate configure & friends for GIT users.
 
+gnulib_url="git://git.sv.gnu.org/gnulib.git"
+gnulib_hash="4084b3a1094372b960ce4a97634e08f4538c8bdd"
+
+modules="
+	strcase
+	strcasestr-simple
+	strnlen
+"
+
+# Make sure the local gnulib git repo is up-to-date.
+if [ ! -d "gnulib" ]; then
+	git clone --depth=123 ${gnulib_url}
+fi
+cd gnulib >/dev/null || exit 1
+curr_hash=$(git log -1 --format=%H)
+if [ "${gnulib_hash}" != "${curr_hash}" ]; then
+	git pull
+	git checkout -f ${gnulib_hash}
+fi
+cd .. >/dev/null || exit 1
+
+rm -rf lib
+./gnulib/gnulib-tool \
+	--import \
+	${modules}
+
 autoreconf -f -i -s

configure.ac

@@ -26,10 +26,16 @@ dnl Make sure the ONCE macros are available.
 
 AC_PREREQ([2.69])
 
+dnl Lie about gnulib features we don't use to speed up & shrink down.
+
+gl_cv_func_printf_infinite_long_double=yes
+
 dnl Checks for programs.
 
 AC_GNU_SOURCE
 AC_PROG_CC
+gl_EARLY
+gl_INIT
 AC_PROG_LN_S
 AC_ISC_POSIX
 AC_SYS_LARGEFILE
@@ -747,6 +753,7 @@ AC_CONFIG_FILES([
 Makefile
 doc/Makefile
 doc/sample.nanorc
+lib/Makefile
 m4/Makefile
 po/Makefile.in
 src/Makefile

m4/Makefile.am

@@ -8,6 +8,7 @@ EXTRA_DIST = \
 	glib-2.0.m4 \
 	glibc21.m4 \
 	glibc2.m4 \
+	gnulib-cache.m4 \
 	iconv.m4 \
 	intdiv0.m4 \
 	intldir.m4 \

src/Makefile.am

@@ -1,4 +1,5 @@
-AM_CPPFLAGS = -DLOCALEDIR=\"$(localedir)\" -DSYSCONFDIR=\"$(sysconfdir)\"
+AM_CPPFLAGS = -DLOCALEDIR=\"$(localedir)\" -DSYSCONFDIR=\"$(sysconfdir)\" \
+	-I$(top_builddir)/lib -I$(top_srcdir)/lib
 
 CLEANFILES = revision.h
 
@@ -37,7 +38,7 @@ nano_SOURCES =	browser.c \
 		utils.c \
 		winio.c 
 
-nano_LDADD = @GLIB_LIBS@ @LIBINTL@
+nano_LDADD = @GLIB_LIBS@ @LIBINTL@ $(top_builddir)/lib/libgnu.a
 
 install-exec-hook:
 	cd $(DESTDIR)$(bindir) && rm -f rnano && $(LN_S) nano rnano