Fix formatting of empty .Bl -inset item heads.

Downgrade empty item heads from ERROR to WARNING.
Show the list type in the error message.
Choose better variable names for nodes in post_it().

4 files changed, 25 insertions, 27 deletions

diff --git a/mandoc.h b/mandoc.h
index bc2bd976..58f6f644 100644
--- a/mandoc.h
+++ b/mandoc.h
@@ -91,6 +91,7 @@ enum	mandocerr {
 	MANDOCERR_DISPTYPE, /* missing display type */
 	MANDOCERR_LISTFIRST, /* list type must come first */
 	MANDOCERR_NOWIDTHARG, /* tag lists require a width argument */
+	MANDOCERR_IT_NOHEAD, /* missing head in list item: type */
 	MANDOCERR_FONTTYPE, /* missing font type */
 
 	/* related to bad macro arguments */
@@ -146,7 +147,6 @@ enum	mandocerr {
 	MANDOCERR_SCOPEEXIT, /* scope open on exit */
 	MANDOCERR_UNAME, /* uname(3) system call failed */
 	/* FIXME: merge following with MANDOCERR_ARGCOUNT */
-	MANDOCERR_NOARGS, /* macro requires line argument(s) */
 	MANDOCERR_NOBODY, /* macro requires body argument(s) */
 	MANDOCERR_NOARGV, /* macro requires argument(s) */
 	MANDOCERR_NUMERIC, /* request requires a numeric argument */
diff --git a/mdoc_term.c b/mdoc_term.c
index 89cdbdd6..7c32cc2b 100644
--- a/mdoc_term.c
+++ b/mdoc_term.c
@@ -747,7 +747,7 @@ termp_it_pre(DECL_ARGS)
 			term_word(p, "\\ \\ ");
 		break;
 	case LIST_inset:
-		if (MDOC_BODY == n->type)
+		if (MDOC_BODY == n->type && n->parent->head->nchild)
 			term_word(p, "\\ ");
 		break;
 	default:
diff --git a/mdoc_validate.c b/mdoc_validate.c
index 945d684b..71b87562 100644
--- a/mdoc_validate.c
+++ b/mdoc_validate.c
@@ -1270,27 +1270,24 @@ post_it(POST_ARGS)
 {
 	int		  i, cols;
 	enum mdoc_list	  lt;
-	struct mdoc_node *n, *c;
+	struct mdoc_node *nbl, *nit, *nch;
 	enum mandocerr	  er;
 
-	if (MDOC_BLOCK != mdoc->last->type)
+	nit = mdoc->last;
+	if (MDOC_BLOCK != nit->type)
 		return(1);
 
-	n = mdoc->last->parent->parent;
-	lt = n->norm->Bl.type;
+	nbl = nit->parent->parent;
+	lt = nbl->norm->Bl.type;
 
 	if (LIST__NONE == lt) {
-		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_LISTTYPE);
+		mdoc_nmsg(mdoc, nit, MANDOCERR_LISTTYPE);
 		return(1);
 	}
 
 	switch (lt) {
 	case LIST_tag:
-		if (mdoc->last->head->child)
-			break;
-		/* FIXME: give this a dummy value. */
-		mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS);
-		break;
+		/* FALLTHROUGH */
 	case LIST_hang:
 		/* FALLTHROUGH */
 	case LIST_ohang:
@@ -1298,8 +1295,10 @@ post_it(POST_ARGS)
 	case LIST_inset:
 		/* FALLTHROUGH */
 	case LIST_diag:
-		if (NULL == mdoc->last->head->child)
-			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS);
+		if (NULL == nit->head->child)
+			mandoc_msg(MANDOCERR_IT_NOHEAD,
+			    mdoc->parse, nit->line, nit->pos,
+			    mdoc_argnames[nbl->args->argv[0].arg]);
 		break;
 	case LIST_bullet:
 		/* FALLTHROUGH */
@@ -1308,23 +1307,23 @@ post_it(POST_ARGS)
 	case LIST_enum:
 		/* FALLTHROUGH */
 	case LIST_hyphen:
-		if (NULL == mdoc->last->body->child)
-			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY);
+		if (NULL == nit->body->child)
+			mdoc_nmsg(mdoc, nit, MANDOCERR_NOBODY);
 		/* FALLTHROUGH */
 	case LIST_item:
-		if (mdoc->last->head->child)
-			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST);
+		if (NULL != nit->head->child)
+			mdoc_nmsg(mdoc, nit, MANDOCERR_ARGSLOST);
 		break;
 	case LIST_column:
-		cols = (int)n->norm->Bl.ncols;
+		cols = (int)nbl->norm->Bl.ncols;
 
-		assert(NULL == mdoc->last->head->child);
+		assert(NULL == nit->head->child);
 
-		if (NULL == mdoc->last->body->child)
-			mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY);
+		if (NULL == nit->body->child)
+			mdoc_nmsg(mdoc, nit, MANDOCERR_NOBODY);
 
-		for (i = 0, c = mdoc->last->child; c; c = c->next)
-			if (MDOC_BODY == c->type)
+		for (i = 0, nch = nit->child; nch; nch = nch->next)
+			if (MDOC_BODY == nch->type)
 				i++;
 
 		if (i < cols)
@@ -1334,8 +1333,7 @@ post_it(POST_ARGS)
 		else
 			er = MANDOCERR_SYNTARGCOUNT;
 
-		mandoc_vmsg(er, mdoc->parse,
-		    mdoc->last->line, mdoc->last->pos,
+		mandoc_vmsg(er, mdoc->parse, nit->line, nit->pos,
 		    "columns == %d (have %d)", cols, i);
 		return(MANDOCERR_ARGCOUNT == er);
 	default:
diff --git a/read.c b/read.c
index 014adb5b..7db8871d 100644
--- a/read.c
+++ b/read.c
@@ -135,6 +135,7 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"missing display type",
 	"list type must come first",
 	"tag lists require a width argument",
+	"missing head in list item",
 	"missing font type",
 
 	/* related to bad macro arguments */
@@ -189,7 +190,6 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"missing end of block",
 	"scope open on exit",
 	"uname(3) system call failed",
-	"macro requires line argument(s)",
 	"macro requires body argument(s)",
 	"macro requires argument(s)",
 	"request requires a numeric argument",