Conditionally install bash completion

Signed-off-by: Alexey Neyman <stilor@att.net>

Makefile.am

@@ -6,8 +6,13 @@ include verbatim-data.mk
 SUBDIRS		= kconfig
 
 bin_SCRIPTS		= ct-ng
-CLEANFILES		= $(bin_SCRIPTS)
-EXTRA_DIST		= ct-ng.in bootstrap docs/ct-ng.1.in
+CLEANFILES		= ct-ng ct-ng.comp docs/ct-ng.1
+EXTRA_DIST		= bootstrap ct-ng.in ct-ng.comp.in docs/ct-ng.1.in maintainer
+
+if INSTALL_BASH_COMPLETION
+compdir				= $(sysconfdir)/@BASH_COMPLETION_DIR@
+comp_SCRIPTS		= ct-ng.comp
+endif
 
 man1_MANS	= docs/ct-ng.1
 
@@ -45,8 +50,11 @@ do_subst		= ( @SED@ \
 ct-ng: ct-ng.in Makefile
 	$(AM_V_GEN)$(do_subst) < $< >$@-t && chmod a-w,a+x $@-t && mv -f $@-t $@
 
-docs/ct-ng.1: docs/ct-ng.1.in
+docs/ct-ng.1: docs/ct-ng.1.in Makefile
 	$(AM_V_GEN)$(MKDIR_P) docs && $(do_subst) < $< >$@-t && mv -f $@-t $@
 
+ct-ng.comp: ct-ng.comp.in Makefile
+	$(AM_V_GEN)$(do_subst) < $< >$@-t && mv -f $@-t $@
+
 dist-hook: maintainer/download-docs.sh
 	$< $(top_distdir) $(USER_MANUAL_FILES)

configure.ac

@@ -33,6 +33,16 @@ AC_ARG_ENABLE(
         [run ct-ng from the current directory; 'make install' unsupported])])
 AC_SUBST([enable_local], [${enable_local:-no}])
 
+AC_ARG_WITH([bash-completion-dir],
+    [AS_HELP_STRING(
+        [--with-bash-completion],
+        [install bash(1) command completion for ct-ng into specified directory,
+         relative to sysconfdir])],
+    [],
+    [with_bash_completion_dir=bash_completion.d])
+AM_CONDITIONAL([INSTALL_BASH_COMPLETION], [test "${with_bash_completion_dir}" != "no" ])
+AC_SUBST([BASH_COMPLETION_DIR], [${with_bash_completion_dir}])
+
 # FIXME: I don't know why we have this. Will remove after the 1.24 release.
 AC_ARG_ENABLE(
     [shared],

ct-ng.comp.in

@@ -17,7 +17,7 @@ _ct_ng () {
 
     actions='help menuconfig nconfig oldconfig saveconfig extractconfig
              defconfig savedefconfig
-             build build. build-all build-all.
+             build build-all
              wiki-samples list-samples list-samples-short check-samples
              list-steps
              show-tuple show-all show-config
@@ -33,4 +33,4 @@ _ct_ng () {
     COMPREPLY=($(compgen -W "${ct_ng_opts}" -- "${cur}"))
     return 0
 }
-complete -F _ct_ng ct-ng
+complete -F _ct_ng @progname@