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mothra: handle blank lines inside <pre> tags

--- a/sys/src/cmd/mothra/rdhtml.c

+++ b/sys/src/cmd/mothra/rdhtml.c

@@ -540,9 +540,9 @@

 	return ENDTAG;

 }

 /*

- * The next token is a tag, an end tag or a sequence of

- * non-white characters.

- * If inside <pre>, newlines are converted to <br> and spaces are preserved.

+ * The next token is a tag, an end tag or a sequence of non-white

+ * characters. If inside <pre>, single newlines are converted to <br>,

+ * double newlines are converted to <p> and spaces are preserved.

  * Otherwise, spaces and newlines are noted and discarded.

  */

 int pl_gettoken(Hglob *g){

@@ -552,8 +552,15 @@

 	case STAG: return pl_gettag(g);

 	case EOF: return EOF;

 	case '\n':

-		pl_tagparse(g, "br");

-		return TAG;

+		switch(c=pl_nextc(g)){

+		case '\n':

+			pl_tagparse(g, "p");

+			return TAG;

+		default:

+			pl_tagparse(g, "br");

+			pl_putback(g, c);

+			return TAG;

+		}

 	default:

 		tokp=g->token;

 		while(c=='\t'){

-- 

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