Add support for underlined headers

markdown.awk

@@ -3,13 +3,24 @@ BEGIN {
 	in_code = 0
 }
 
-function parse_header(str) {
+function parse_header(str,    hnum, content) {
+	if (substr(str, 1, 1) == "#") {
 		match(str, /#+/);
     	hnum = RLENGTH;
 
 		content = parse_line(substr(str, hnum + 1, length(str) - hnum ));
 		return "<h" hnum ">" content "</h" hnum ">";
 	}
+	if (match(body, /^[^\n]+\n=+$/)) {
+		gsub(/\n=+$/, "", str);
+		return "<h1>" parse_line(str) "</h1>"
+	}
+	if (match(body, /^[^\n]+\n-+$/)) {
+		gsub(/\n-+$/, "", str);
+		return "<h2>" parse_line(str) "</h2>"
+	}
+	return "";
+}
 
 function read_line(str, pos, res, i) {
 	res = "";
@@ -254,7 +265,7 @@ function parse_block(str) {
 	if (match(str, /^```\n.*```$/) || match(str, /^    /)) {
 		return parse_code(str);
 	}
-	if (substr(str, 1, 1) == "#") {
+	if (substr(str, 1, 1) == "#" || match(body, /^[^\n]+\n[-=]+$/)) {
 		return parse_header(str);
 	}
 	else if (substr(str, 1, 1) == ">") {
@@ -278,6 +289,9 @@ function line_continues(body, line) {
 	if (match(body, /^#* /))
 		return 0;
 
+	if (match(body, /^[^\n]+\n[-=]+$/))
+		return 0;
+
 	if (line != "")
 		return 1;
 

test.sh

@@ -86,6 +86,17 @@ check <<-EOF
 <h3> Header3</h3>
 EOF
 
+check <<-EOF
+underlined header 1
+===================
+
+underlined header 2
+-------------------
+---
+<h1>underlined header 1</h1>
+<h2>underlined header 2</h2>
+EOF
+
 check <<-EOF
 **bold**
 ---