--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/header/mod.rs	Thu Feb 16 15:22:52 2023 +0100
@@ -0,0 +1,47 @@
+use crate::interpret_line;
+
+// returns true if the previous line is handled as a header, ie. this line contains only
+// ---------- or ===========, in this case it will change the vector of lines and return true
+pub fn handle_as_header(ip:&String, html_lines: &mut Vec<String>, ht:usize, bold_it: &mut bool, bold:&mut bool, italic:&mut bool) -> bool {
+    let ch = ['-', '='];
+    if only(&ip, ch[ht - 1]) {
+        let last_line:String = html_lines.last().unwrap().to_owned();
+        let header = format_header(last_line, ht, ht, bold_it, bold, italic);
+        html_lines.pop();
+        html_lines.push(header);
+        return true;
+    }
+    return false;
+}
+
+// formats the header
+pub fn format_header(s:String, c:usize, d:usize, bold_it:&mut bool, bold:&mut bool, italic:&mut bool) -> String {
+    let m: String =  s[(c-d)..].to_string().trim().to_string();
+    let m = interpret_line(&m, bold_it, bold, italic);
+    let nr = String::from(c.to_string());
+    let cp = ">\n";
+    let h:String = "\n<h".to_string() + &nr + &cp + &m + &"\n</h".to_string() + &nr + &cp;
+    return h;
+}
+
+// checks if the string contains only the given character
+fn only(s:&String, c:char) -> bool
+{
+    if s.is_empty() {
+        return false;
+    }
+    for sc in s.chars() {
+        if sc != c {
+            return false;
+        }
+    }
+    return true;
+}
+
+// returns true if the line is a header line, ie. starts with a set of #'s
+pub fn header(s:&str, c:usize) -> bool {
+    if s.starts_with( &'#'.to_string().repeat(c)) {
+        return true
+    }
+    return false
+}