From bd3098691458c5747aaf32df5d07921350f9d7e9 Mon Sep 17 00:00:00 2001
From: wrmr
Date: Tue, 23 Sep 2025 22:27:01 -0400
Subject: add h4

---
 main.c | 29 +++++++++++------------------
 1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/main.c b/main.c
index eba5640..f52297d 100644
--- a/main.c
+++ b/main.c
@@ -142,6 +142,7 @@ typedef enum {
 	LN_HDR1,
 	LN_HDR2,
 	LN_HDR3,
+	LN_HDR4,
 	LN_NONE
 } LineType;
 
@@ -173,6 +174,8 @@ int is_ol_item(Str s) {
 LineType classify_line(Str line, LineType prev) {
 	if (line.n == 0) {
 		return LN_NONE;
+	} else if (str_starts(line, S("####"))) {
+		return LN_HDR4;
 	} else if (str_starts(line, S("###"))) {
 		return LN_HDR3;
 	} else if (str_starts(line, S("##"))) {
@@ -213,15 +216,10 @@ LineType line_init(Line *l, Str txt, LineType t) {
 		l->url = c.head;
 		l->txt = c.tail;
 		return has_image_ext(l->url) ? LN_IMG : LN_LINK;
-	case LN_HDR1:
-		l->txt = str_trim(str_skip(txt, 1));
-		break;
-	case LN_HDR2:
-		l->txt = str_trim(str_skip(txt, 2));
-		break;
-	case LN_HDR3:
-		l->txt = str_trim(str_skip(txt, 3));
-		break;
+	case LN_HDR1: l->txt = str_trim(str_skip(txt, 1)); break;
+	case LN_HDR2: l->txt = str_trim(str_skip(txt, 2)); break;
+	case LN_HDR3: l->txt = str_trim(str_skip(txt, 3)); break;
+	case LN_HDR4: l->txt = str_trim(str_skip(txt, 4)); break;
 	case LN_ULIST:
 		l->txt = str_skip(txt, 2);
 		break;
@@ -474,15 +472,10 @@ void markup_block(Str *out, Block *blk, Arena *perm, Arena *scratch) {
 		Otl("<li>", l->txt, "</li>\n");
 		Os("<ol>");
 		break;
-	case LN_HDR1:
-		Otl("<h1>", l->txt, "</h1>");
-		break;
-	case LN_HDR2:
-		Otl("<h2>", l->txt, "</h2>");
-		break;
-	case LN_HDR3:
-		Otl("<h3>", l->txt, "</h3>");
-		break;
+	case LN_HDR1: Otl("<h1>", l->txt, "</h1>"); break;
+	case LN_HDR2: Otl("<h2>", l->txt, "</h2>"); break;
+	case LN_HDR3: Otl("<h3>", l->txt, "</h3>"); break;
+	case LN_HDR4: Otl("<h4>", l->txt, "</h4>"); break;
 	default:
 	case LN_PAR:
 		Os("<p>");
-- 
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