Rewrite to Odin

src/parser.odin

@@ -0,0 +1,58 @@
+package main
+
+import "core:fmt"
+import "core:strings"
+
+replace_text :: proc(text: string, start: int, len_: int, repl: string) -> string {
+	builder := strings.builder_make(context.temp_allocator)
+	strings.write_string(&builder, text[:start])
+	strings.write_string(&builder, repl)
+	strings.write_string(&builder, text[start + len_:])
+	return strings.to_string(builder)
+}
+
+parse_header :: proc(line: string) -> (int, string) {
+	if len(line) == 0 {
+		return 0, line
+	}
+
+	lvl := 0
+	for lvl < len(line) && line[lvl] == '!' {
+		lvl += 1
+	}
+	if lvl == 0 || lvl >= len(line) || line[lvl] != ' ' {
+		return 0, line
+	}
+	return lvl, line[lvl + 1:]
+}
+
+parse :: proc(lines: []string, allocator := context.allocator) -> string {
+	builder := strings.builder_make(allocator)
+	strings.write_string(&builder, "<p>")
+
+	for line in lines {
+		trimmed := strings.trim_space(line)
+
+		if len(trimmed) == 0 {
+			strings.write_string(&builder, "<br>\n")
+			continue
+		}
+
+		lvl, text := parse_header(trimmed)
+		is_header := lvl > 0
+
+		if is_header {
+			fmt.sbprintf(&builder, "<h%d>", lvl)
+			strings.write_string(&builder, text)
+			fmt.sbprintf(&builder, "</h%d>", lvl)
+		} else {
+			strings.write_string(&builder, text)
+			strings.write_string(&builder, "<br>")
+		}
+
+		strings.write_string(&builder, "\n")
+	}
+
+	strings.write_string(&builder, "</p>")
+	return strings.to_string(builder)
+}