maint: enforce one small aspect of formatting style: space-before-"("

* cfg.mk (sc_space_before_open_paren): New rule.

diff --git a/cfg.mk b/cfg.mk
index 71f3d85a4b41459f1073a6d815554031de90db79..8a6adc2a9202fdcf95df7f80907074f82298b764 100644 (file)
--- a/cfg.mk
+++ b/cfg.mk
@@ -261,6 +261,29 @@ sc_prohibit_sleep:
        msg='prefer xnanosleep over other sleep interfaces'             \
          $(_prohibit_regexp)
 
+_space_before_paren_exempt =? \\n\\$$
+_space_before_paren_exempt = \
+  (\\n\\$$|%s\(to %s|delimit-method|(date|group|character)\(s\))
+# Ensure that there is a space before each open parenthesis in C code.
+sc_space_before_open_paren:
+       @if $(VC_LIST_EXCEPT) | grep -l '\.[ch]$$' > /dev/null; then    \
+         if (cpp -fpreprocessed < /dev/null > /dev/null 2>&1); then    \
+           fail=0;                                                     \
+           for c in $$($(VC_LIST_EXCEPT) | grep '\.[ch]$$'); do        \
+             cpp -fpreprocessed $$c 2>/dev/null                        \
+               | grep -ni '[[:alnum:]]('                               \
+               | grep -vE '$(_space_before_paren_exempt)'              \
+               | grep . && { fail=1; echo "*** $$c"; };                \
+           done;                                                       \
+           test $$fail = 1 &&                                          \
+             { echo '$(ME): the above files lack a space-before-open-paren' \
+                 1>&2; exit 1; } || :;                                 \
+         else                                                          \
+           echo '$(ME): skipping test $@: cppi not installed' 1>&2;    \
+         fi;                                                           \
+       else :;                                                         \
+       fi
+
 include $(srcdir)/dist-check.mk
 
 update-copyright-env = \