mdocml: Partial implementation of .Bd -centered.

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Partial implementation of .Bd -centered.

In groff, .Bd -centered operates in fill mode, which is relatively
hard to implement, while this implementation operates in non-fill
mode so far.  As long as you pay attention that your lines do not
overflow, it works.  To make sure that rendering is the same for
mandoc and groff, it is recommended to insert .br between lines
for now.  This implementation will need improvement later.

Modified Files:
--------------
    mdocml:
        mdoc.h
        mdoc_term.c
        mdoc_validate.c

Revision Data
-------------
Index: mdoc_validate.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc_validate.c,v
retrieving revision 1.230
retrieving revision 1.231
diff -Lmdoc_validate.c -Lmdoc_validate.c -u -p -r1.230 -r1.231
--- mdoc_validate.c
+++ mdoc_validate.c
@@ -802,7 +802,7 @@ pre_bd(PRE_ARGS)
 
 		switch (argv->arg) {
 		case MDOC_Centred:
-			dt = DISP_centred;
+			dt = DISP_centered;
 			break;
 		case MDOC_Ragged:
 			dt = DISP_ragged;
Index: mdoc_term.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc_term.c,v
retrieving revision 1.271
retrieving revision 1.272
diff -Lmdoc_term.c -Lmdoc_term.c -u -p -r1.271 -r1.272
--- mdoc_term.c
+++ mdoc_term.c
@@ -1571,7 +1571,7 @@ termp_fa_pre(DECL_ARGS)
 static int
 termp_bd_pre(DECL_ARGS)
 {
-	size_t			 tabwidth, rm, rmax;
+	size_t			 tabwidth, lm, len, rm, rmax;
 	struct mdoc_node	*nn;
 
 	if (MDOC_BLOCK == n->type) {
@@ -1592,18 +1592,29 @@ termp_bd_pre(DECL_ARGS)
 	 */
 
 	if (DISP_literal != n->norm->Bd.type &&
-	    DISP_unfilled != n->norm->Bd.type)
+	    DISP_unfilled != n->norm->Bd.type &&
+	    DISP_centered != n->norm->Bd.type)
 		return(1);
 
 	tabwidth = p->tabwidth;
 	if (DISP_literal == n->norm->Bd.type)
 		p->tabwidth = term_len(p, 8);
 
+	lm = p->offset;
 	rm = p->rmargin;
 	rmax = p->maxrmargin;
 	p->rmargin = p->maxrmargin = TERM_MAXMARGIN;
 
 	for (nn = n->child; nn; nn = nn->next) {
+		if (DISP_centered == n->norm->Bd.type) {
+			if (MDOC_TEXT == nn->type) {
+				len = term_strlen(p, nn->string);
+				p->offset = len >= rm ? 0 :
+				    lm + len >= rm ? rm - len :
+				    (lm + rm - len) / 2;
+			} else
+				p->offset = lm;
+		}
 		print_mdoc_node(p, pair, meta, nn);
 		/*
 		 * If the printed node flushes its own line, then we
Index: mdoc.h
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc.h,v
retrieving revision 1.130
retrieving revision 1.131
diff -Lmdoc.h -Lmdoc.h -u -p -r1.130 -r1.131
--- mdoc.h
+++ mdoc.h
@@ -280,7 +280,7 @@ enum	mdoc_list {
 
 enum	mdoc_disp {
 	DISP__NONE = 0,
-	DISP_centred, /* -centered */
+	DISP_centered, /* -centered */
 	DISP_ragged, /* -ragged */
 	DISP_unfilled, /* -unfilled */
 	DISP_filled, /* -filled */
--
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