[PATCH] implement .Bk

[Ingo Schwarze <schwarze@usta.de>]

Hi,

yesterday night, i arrived at Edmonton for the c2k10, the OpenBSD
yearly general hackathon.  I plan to spend this week on mandoc.

Here is the first patch i hacked up on the plane,
implementing proper .Bk support.
It is based on OpenBSD-current and can probably go in more or less
as it is after merging bsd.lv HEAD into OpenBSD.

Yours,
  Ingo


Index: mdoc_term.c
===================================================================
RCS file: /cvs/src/usr.bin/mandoc/mdoc_term.c,v
retrieving revision 1.87
diff -u -p -r1.87 mdoc_term.c
--- mdoc_term.c	10 Jun 2010 22:50:10 -0000	1.87
+++ mdoc_term.c	26 Jun 2010 11:38:21 -0000
@@ -71,6 +71,7 @@ static	void	  termp____post(DECL_ARGS);
 static	void	  termp_an_post(DECL_ARGS);
 static	void	  termp_aq_post(DECL_ARGS);
 static	void	  termp_bd_post(DECL_ARGS);
+static	void	  termp_bk_post(DECL_ARGS);
 static	void	  termp_bl_post(DECL_ARGS);
 static	void	  termp_bq_post(DECL_ARGS);
 static	void	  termp_brq_post(DECL_ARGS);
@@ -95,6 +96,7 @@ static	int	  termp_ap_pre(DECL_ARGS);
 static	int	  termp_aq_pre(DECL_ARGS);
 static	int	  termp_bd_pre(DECL_ARGS);
 static	int	  termp_bf_pre(DECL_ARGS);
+static	int	  termp_bk_pre(DECL_ARGS);
 static	int	  termp_bl_pre(DECL_ARGS);
 static	int	  termp_bold_pre(DECL_ARGS);
 static	int	  termp_bq_pre(DECL_ARGS);
@@ -234,7 +236,7 @@ static	const struct termact termacts[MDO
 	{ NULL, NULL }, /* Fc */ 
 	{ termp_op_pre, termp_op_post }, /* Oo */
 	{ NULL, NULL }, /* Oc */
-	{ NULL, NULL }, /* Bk */
+	{ termp_bk_pre, termp_bk_post }, /* Bk */
 	{ NULL, NULL }, /* Ek */
 	{ termp_bt_pre, NULL }, /* Bt */
 	{ NULL, NULL }, /* Hf */
@@ -2157,6 +2159,24 @@ termp_lk_pre(DECL_ARGS)
 	return(0);
 }
 
+
+/* ARGSUSED */
+static int
+termp_bk_pre(DECL_ARGS)
+{
+
+	p->flags |= TERMP_PREKEEP;
+	return(1);
+}
+
+
+/* ARGSUSED */
+static void
+termp_bk_post(DECL_ARGS)
+{
+
+	p->flags &= ~(TERMP_KEEP | TERMP_PREKEEP);
+}
 
 /* ARGSUSED */
 static int
Index: term.c
===================================================================
RCS file: /cvs/src/usr.bin/mandoc/term.c,v
retrieving revision 1.37
diff -u -p -r1.37 term.c
--- term.c	10 Jun 2010 22:50:10 -0000	1.37
+++ term.c	26 Jun 2010 11:38:21 -0000
@@ -480,9 +480,15 @@ term_word(struct termp *p, const char *w
 		}
 
 	if ( ! (TERMP_NOSPACE & p->flags)) {
-		bufferc(p, ' ');
-		if (TERMP_SENTENCE & p->flags)
+		if (TERMP_KEEP & p->flags)
+			bufferc(p, ASCII_NBRSP);
+		else {
+			if (TERMP_PREKEEP & p->flags)
+				p->flags |= TERMP_KEEP;
 			bufferc(p, ' ');
+			if (TERMP_SENTENCE & p->flags)
+				bufferc(p, ' ');
+		}
 	}
 
 	if ( ! (p->flags & TERMP_NONOSPACE))
Index: term.h
===================================================================
RCS file: /cvs/src/usr.bin/mandoc/term.h,v
retrieving revision 1.20
diff -u -p -r1.20 term.h
--- term.h	10 Jun 2010 22:50:10 -0000	1.20
+++ term.h	26 Jun 2010 11:38:21 -0000
@@ -76,6 +76,8 @@ struct	termp {
 #define	TERMP_NOSPLIT	 (1 << 11)	/* See termp_an_pre/post(). */
 #define	TERMP_SPLIT	 (1 << 12)	/* See termp_an_pre/post(). */
 #define	TERMP_ANPREC	 (1 << 13)	/* See termp_an_pre(). */
+#define	TERMP_KEEP	 (1 << 14)	/* Keep words together. */
+#define	TERMP_PREKEEP	 (1 << 15)	/* ...starting with the next one. */
 	char		 *buf;		/* Output buffer. */
 	enum termenc	  enc;		/* Type of encoding. */
 	void		 *symtab;	/* Encoded-symbol table. */
--
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