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Date: Wed, 30 Apr 2014 08:34:44 -0400 (EDT)
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From: kristaps@mdocml.bsd.lv
To: source@mdocml.bsd.lv
Subject: docbook2mdoc: For some elements, we want to look ahead to see if the 
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Log Message:
-----------
For some elements, we want to look ahead to see if the next node is text
and begins with punctuation.  If so, we can print that punctuation or
our line and make it work well with mdoc(7).  For example,

  <constant>bar</constant>.

will now render as

  .Dv bar .

This makes output pages much more readable.

Modified Files:
--------------
    docbook2mdoc:
        docbook2mdoc.c

Revision Data
-------------
Index: docbook2mdoc.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/docbook2mdoc/docbook2mdoc.c,v
retrieving revision 1.36
retrieving revision 1.37
diff -Ldocbook2mdoc.c -Ldocbook2mdoc.c -u -p -r1.36 -r1.37
--- docbook2mdoc.c
+++ docbook2mdoc.c
@@ -64,6 +64,7 @@ struct	pattr {
 struct	pnode {
 	enum nodeid	 node; /* node type */
 	char		*b; /* binary data buffer */
+	char		*real; /* store for "b" */
 	size_t		 bsz; /* data buffer size */
 	struct pnode	*parent; /* parent (or NULL if top) */
 	struct pnodeq	 childq; /* queue of children */
@@ -233,6 +234,7 @@ xml_char(void *arg, const XML_Char *p, i
 	}
 	memcpy(ps->cur->b + ps->cur->bsz, p, sz);
 	ps->cur->bsz += (size_t)sz;
+	ps->cur->real = ps->cur->b;
 }
 
 static void
@@ -436,7 +438,7 @@ pnode_free(struct pnode *pn)
 		free(ap);
 	}
 
-	free(pn->b);
+	free(pn->real);
 	free(pn);
 }
 
@@ -620,6 +622,41 @@ pnode_printmclose(struct parse *p, int s
 }
 
 /*
+ * Like pnode_printmclose() except we look to the next node, and, if
+ * found, see if it starts with punctuation.
+ * If it does, then we print that punctuation before the newline.
+ */
+static void
+pnode_printmclosepunct(struct parse *p, struct pnode *pn, int sv)
+{
+	/* We wouldn't have done anything anyway. */
+	if ( ! (sv && ! p->newln)) 
+		return;
+
+	/* No next node or it's not text. */
+	if (NULL == (pn = TAILQ_NEXT(pn, child))) {
+		pnode_printmclose(p, sv);
+		return;
+	} else if (NODE_TEXT != pn->node) {
+		pnode_printmclose(p, sv);
+		return;
+	} 
+
+	/* Only do this for the comma/period. */
+	if (pn->bsz > 0 &&
+		(',' == pn->b[0] || '.' == pn->b[0]) &&
+		(1 == pn->bsz || isspace((int)pn->b[1]))) {
+		putchar(' ');
+		putchar(pn->b[0]);
+		pn->b++;
+		pn->bsz--;
+	} 
+
+	putchar('\n');
+	p->newln = 1;
+}
+
+/*
  * If the SYNOPSIS macro has a superfluous title, kill it.
  */
 static void
@@ -1251,8 +1288,15 @@ pnode_print(struct parse *p, struct pnod
 	case (NODE_TEXT):
 		if (0 == p->newln)
 			putchar(' ');
+
 		bufclear(p);
 		bufappend(p, pn);
+
+		if (0 == p->bsz) {
+			assert(pn->real != pn->b);
+			break;
+		}
+
 		/*
 		 * Output all characters, squeezing out whitespace
 		 * between newlines. 
@@ -1261,6 +1305,7 @@ pnode_print(struct parse *p, struct pnod
 		 */
 		assert(p->bsz);
 		cp = p->b;
+
 		/*
 		 * There's often a superfluous "-" in its <option> tags
 		 * before the actual flags themselves.
@@ -1333,7 +1378,7 @@ pnode_print(struct parse *p, struct pnod
 	case (NODE_TEXT):
 	case (NODE_USERINPUT):
 	case (NODE_VARNAME):
-		pnode_printmclose(p, sv);
+		pnode_printmclosepunct(p, pn, sv);
 		break;
 	case (NODE_QUOTE):
 		pnode_printmclose(p, sv);
--
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