add gui.escape_markup

src/graphics/ui/markdown.cpp

@@ -1,7 +1,5 @@
 #include "markdown.hpp"
 
-#include <sstream>
-
 #include "graphics/core/Font.hpp"
 
 using namespace markdown;
@@ -66,6 +64,7 @@ Result<CharT> process_markdown(
                         pos++;
                         continue;
                 }
+                pos--;
             }
         } else if (first == '*') {
             if (pos + 1 < source.size() && source[pos+1] == '*') {

src/graphics/ui/markdown.hpp

@@ -2,6 +2,7 @@
 
 #include <string>
 #include <memory>
+#include <sstream>
 
 struct FontStylesScheme;
 
@@ -19,4 +20,24 @@ namespace markdown {
 
     Result<char> process(std::string_view source, bool eraseMarkdown);
     Result<wchar_t> process(std::wstring_view source, bool eraseMarkdown);
+
+    template <typename CharT>
+    inline std::basic_string<CharT> escape(std::string_view source) {
+        std::basic_stringstream<CharT> ss;
+        int pos = 0;
+        while (pos < source.size()) {
+            CharT first = source[pos];
+            if (first == '\\' && pos + 1 < source.size()) {
+                CharT second = source[++pos];
+                ss << first << second;
+                pos++;
+                continue;
+            } else if (first == '*' || first == '~' || first == '_') {
+                ss << '\\';
+            }
+            ss << first;
+            pos++;
+        }
+        return ss.str();
+    }
 }