When .Sm is called without an argument, groff toggles the spacing mode,

so let us do the same for compatibility.  Using this feature is of
course not recommended except in manual page obfuscation contests.

3 files changed, 33 insertions, 2 deletions

diff --git a/regress/usr.bin/mandoc/mdoc/Sm/Makefile b/regress/usr.bin/mandoc/mdoc/Sm/Makefile
index 6dd7203dd68..ef3a2de066f 100644
--- a/regress/usr.bin/mandoc/mdoc/Sm/Makefile
+++ b/regress/usr.bin/mandoc/mdoc/Sm/Makefile
@@ -1,6 +1,6 @@
-# $OpenBSD: Makefile,v 1.4 2012/07/07 14:10:55 schwarze Exp $
+# $OpenBSD: Makefile,v 1.5 2014/07/02 19:54:39 schwarze Exp $
 
-REGRESS_TARGETS=scope spacing-No spacing-Op
+REGRESS_TARGETS	= noarg scope spacing-No spacing-Op
 
 SKIP_TMAN ?= scope
 
diff --git a/regress/usr.bin/mandoc/mdoc/Sm/noarg.in b/regress/usr.bin/mandoc/mdoc/Sm/noarg.in
new file mode 100644
index 00000000000..bb777430845
--- /dev/null
+++ b/regress/usr.bin/mandoc/mdoc/Sm/noarg.in
@@ -0,0 +1,20 @@
+.Dd July 2, 2014
+.Dt SM-NOARG 1
+.Os OpenBSD
+.Sh NAME
+.Nm Sm-noarg
+.Nd spacing macro without arguments
+.Sh DESCRIPTION
+.Fl f Ar on
+.Sm off
+.Fl f Ar off
+.Sm
+.Fl f Ar toggle Pq now on
+.Sm on
+.Fl f Ar on
+.Sm
+.Fl f Ar toggle Pq now off
+.Pp
+.Sm on
+.Fl f Ar on
+on a new line
diff --git a/regress/usr.bin/mandoc/mdoc/Sm/noarg.out_ascii b/regress/usr.bin/mandoc/mdoc/Sm/noarg.out_ascii
new file mode 100644
index 00000000000..ad4d2c365bb
--- /dev/null
+++ b/regress/usr.bin/mandoc/mdoc/Sm/noarg.out_ascii
@@ -0,0 +1,11 @@
+SM-NOARG(1)                OpenBSD Reference Manual                SM-NOARG(1)
+
+NNAAMMEE
+     SSmm--nnooaarrgg - spacing macro without arguments
+
+DDEESSCCRRIIPPTTIIOONN
+     --ff _o_n --ff_o_f_f --ff _t_o_g_g_l_e (now on) --ff _o_n --ff_t_o_g_g_l_e(nowoff)
+
+     --ff _o_n on a new line
+
+OpenBSD                          July 2, 2014                          OpenBSD