mdocml: implement the tbl(7) "center" layout option

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
implement the tbl(7) "center" layout option

Modified Files:
--------------
    mdocml:
        tbl.7
        tbl_term.c

Revision Data
-------------
Index: tbl.7
===================================================================
RCS file: /home/cvs/mdocml/mdocml/tbl.7,v
retrieving revision 1.24
retrieving revision 1.25
diff -Ltbl.7 -Ltbl.7 -u -p -r1.24 -r1.25
--- tbl.7
+++ tbl.7
@@ -152,7 +152,6 @@ For GNU compatibility, this may also be 
 .Cm frame .
 .It Cm center
 Center the table instead of left-adjusting it.
-Currently ignored.
 For GNU compatibility, this may also be invoked with
 .Cm centre .
 .It Cm decimalpoint
Index: tbl_term.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/tbl_term.c,v
retrieving revision 1.33
retrieving revision 1.34
diff -Ltbl_term.c -Ltbl_term.c -u -p -r1.33 -r1.34
--- tbl_term.c
+++ tbl_term.c
@@ -63,8 +63,9 @@ term_tbl(struct termp *tp, const struct 
 	const struct tbl_head	*hp;
 	const struct tbl_cell	*cp;
 	const struct tbl_dat	*dp;
+	static size_t		 offset;
+	size_t			 rmargin, maxrmargin, tsz;
 	int			 horiz, spans, vert;
-	size_t			 rmargin, maxrmargin;
 
 	rmargin = tp->rmargin;
 	maxrmargin = tp->maxrmargin;
@@ -90,6 +91,21 @@ term_tbl(struct termp *tp, const struct 
 
 		tblcalc(&tp->tbl, sp, rmargin - tp->offset);
 
+		/* Center the table as a whole. */
+
+		offset = tp->offset;
+		if (sp->opts->opts & TBL_OPT_CENTRE) {
+			tsz = sp->opts->opts & (TBL_OPT_BOX | TBL_OPT_DBOX)
+			    ? 2 : !!sp->opts->lvert + !!sp->opts->rvert;
+			for (hp = sp->head; hp != NULL; hp = hp->next)
+				tsz += tp->tbl.cols[hp->ident].width + 3;
+			tsz -= 3;
+			if (offset + tsz > rmargin)
+				tsz -= 1;
+			tp->offset = (offset + rmargin > tsz) ?
+			    (offset + rmargin - tsz) / 2 : 0;
+		}
+
 		/* Horizontal frame at the start of boxed tables. */
 
 		if (sp->opts->opts & TBL_OPT_DBOX)
@@ -189,12 +205,12 @@ term_tbl(struct termp *tp, const struct 
 		assert(tp->tbl.cols);
 		free(tp->tbl.cols);
 		tp->tbl.cols = NULL;
+		tp->offset = offset;
 	}
 
 	tp->flags &= ~TERMP_NONOSPACE;
 	tp->rmargin = rmargin;
 	tp->maxrmargin = maxrmargin;
-
 }
 
 /*
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