From 48750fe720c2f4917803535ec56bc52f937764fd Mon Sep 17 00:00:00 2001
From: Linnnus <linnnus@users.noreply.github.com>
Date: Sun, 4 Feb 2024 09:52:32 +0100
Subject: feat(creole): support headers

---
 src/creole-test.c |  4 +++-
 src/creole.c      | 29 +++++++++++++++++------------
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/src/creole-test.c b/src/creole-test.c
index 3bf820f..23702a1 100644
--- a/src/creole-test.c
+++ b/src/creole-test.c
@@ -10,12 +10,12 @@
 struct {
 	const char *name, *input, *output;
 } tests[] = {
+#if 0
 	{
 		.name    =  "Basic paragraph markup",
 		.input   =  "Basic paragraph test with <, >, & and \"",
 		.output  =  "<p>Basic paragraph test with &lt;, &gt;, &amp; and &quot;</p>"
 	},
-#if 0
 	{
 		.name    =  "Simple unordered list",
 		.input   =  "* list item\n*list item 2",
@@ -66,6 +66,7 @@ struct {
 		.input   =  "{{{\nPreformatted block\n}}}\n{{{Block 2}}}",
 		.output  =  "<pre>Preformatted block\n</pre><pre>Block 2</pre>"
 	},
+#endif
 	{
 		.name    =  "h1",
 		.input   =  "= Header =",
@@ -101,6 +102,7 @@ struct {
 		.input   =  "======= Header =",
 		.output  =  "<p>======= Header =</p>"
 	},
+#if 0
 	{
 		.name    =  "Tables",
 		.input   =  "| A | B |\n| //C// | **D** \\\\ E |",
diff --git a/src/creole.c b/src/creole.c
index f69c543..7eb6ad5 100644
--- a/src/creole.c
+++ b/src/creole.c
@@ -32,29 +32,35 @@ int do_headers(const char *begin, const char *end, bool new_block, FILE *out) {
 	}
 
 	unsigned level = 0;
-	while (*begin == '=') {
+	const char *start = begin;
+	while (*start == '=') {
 		level += 1;
-		begin += 1;
+		start += 1;
+	}
+	if (level > 6) {
+		return 0;
 	}
-	DEBUG("level %d\n", level);
 
-	while (isspace(*begin)) {
-		begin += 1;
+	while (isspace(*start)) {
+		start += 1;
 	}
 
-	const char *stop = end;
-	while (stop + 1 != end && stop[1] != '\n') {
-		stop += 1;
+	const char *eol = start;
+	while (eol != end && *eol != '\n') {
+		eol += 1;
 	}
-	while (*stop == '=') {
+
+	const char *stop = eol;
+	assert(stop > begin);
+	while (stop[-1] == '=' || isspace(stop[-1])) {
 		stop -= 1;
 	}
 
 	fprintf(out, "<h%u>", level);
-	process(begin, stop, false, out);
+	process(start, stop, false, out);
 	fprintf(out, "</h%u>", level);
 
-	return -(stop - begin);
+	return -(eol - begin);
 }
 
 void process(const char *begin, const char *end, bool new_block, FILE *out) {
@@ -73,7 +79,6 @@ void process(const char *begin, const char *end, bool new_block, FILE *out) {
 		// Greedily try all parsers.
 		int affected;
 		for (unsigned i = 0; i < LENGTH(parsers); ++i) {
-			DEBUG("%p\n", parsers[i]);
 			affected = parsers[i](p, end, new_block, out);
 			if (affected) {
 				break;
-- 
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