From 1130e181eef518345b9262478f7b0195fe332dd9 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Fri, 27 Feb 2009 17:32:19 +0100
Subject: maint: teach "make syntax-check" the space-only indentation rule

* cfg.mk (sc_prohibit_tab_based_indentation): New rule.
* .x-sc_prohibit_tab_based_indentation: New file.
* Makefile.am (syntax_check_exceptions): Add file,
.x-sc_prohibit_tab_based_indentation.
---
 .x-sc_prohibit_tab_based_indentation | 6 ++++++
 Makefile.am                          | 1 +
 cfg.mk                               | 6 ++++++
 3 files changed, 13 insertions(+)
 create mode 100644 .x-sc_prohibit_tab_based_indentation

diff --git a/.x-sc_prohibit_tab_based_indentation b/.x-sc_prohibit_tab_based_indentation
new file mode 100644
index 000000000..2f5d92120
--- /dev/null
+++ b/.x-sc_prohibit_tab_based_indentation
@@ -0,0 +1,6 @@
+^GNUMakefile$
+Makefile\.am$
+\.mk$
+^tests/pr/
+ChangeLog.*
+^man/help2man$
diff --git a/Makefile.am b/Makefile.am
index e6a880d51..57b3e334d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,6 +49,7 @@ syntax_check_exceptions =		\
   .x-sc_prohibit_atoi_atof		\
   .x-sc_prohibit_stat_st_blocks		\
   .x-sc_prohibit_strcmp			\
+  .x-sc_prohibit_tab_based_indentation	\
   .x-sc_require_config_h		\
   .x-sc_require_config_h_first		\
   .x-sc_space_tab			\
diff --git a/cfg.mk b/cfg.mk
index 05dbb39b9..b63e76b7e 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -206,4 +206,10 @@ sc_strftime_check:
 	  rm -f $@-src $@-info;						\
 	fi
 
+# Indent only with spaces.
+sc_prohibit_tab_based_indentation:
+	@re='^ *	'						\
+	msg='TAB in indentation; use only spaces'			\
+	  $(_prohibit_regexp)
+
 include $(srcdir)/dist-check.mk
-- 
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