From 15ff70b4c3fdd2e54a8d24834ce52aa5633f92dd Mon Sep 17 00:00:00 2001
From: deeaitch <himrodim@gmail.com>
Date: Fri, 28 Aug 2026 00:32:21 -0400
Subject: [PATCH] Add Markdown converter output

---
 CMakeLists.txt                  |  2 +
 typefactory/convertmarkdown.cpp | 87 +++++++++++++++++++++++++++++++++
 typefactory/convertmarkdown.h   | 13 +++++
 typefactory/main.cpp            |  6 ++-
 typefactory/typefactory.pro     |  2 +
 5 files changed, 108 insertions(+), 2 deletions(-)
 create mode 100644 typefactory/convertmarkdown.cpp
 create mode 100644 typefactory/convertmarkdown.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8c7f61..81899d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,8 @@ endfunction()
 add_executable(kindle2latex_typefactory
   typefactory/convertlatex.cpp
   typefactory/convertlatex.h
+  typefactory/convertmarkdown.cpp
+  typefactory/convertmarkdown.h
   typefactory/converter.cpp
   typefactory/converter.h
   typefactory/main.cpp
diff --git a/typefactory/convertmarkdown.cpp b/typefactory/convertmarkdown.cpp
new file mode 100644
index 0000000..dcfbdbd
--- /dev/null
+++ b/typefactory/convertmarkdown.cpp
@@ -0,0 +1,87 @@
+#include "convertmarkdown.h"
+
+#include <cerrno>
+#include <cstring>
+#include <fstream>
+#include <iostream>
+
+static bool markdown_needs_escape (char ch) {
+  switch (ch) {
+    case '\\':
+    case '`':
+    case '*':
+    case '_':
+    case '{':
+    case '}':
+    case '[':
+    case ']':
+    case '<':
+    case '>':
+    case '(':
+    case ')':
+    case '#':
+    case '+':
+    case '-':
+    case '.':
+    case '!':
+    case '|':
+      return true;
+    default:
+      return false;
+  }
+}
+
+static std::string markdown_escape (const std::string &s) {
+  std::string out;
+  out.reserve (s.size() + s.size() / 8);
+  for (char ch : s) {
+    if (markdown_needs_escape (ch))
+      out.push_back ('\\');
+    out.push_back (ch);
+  }
+  return out;
+}
+
+bool ConverterMarkdown::save (const std::string &output_file_name) {
+  if (!parse())
+    return false;
+
+  std::ofstream output (output_file_name, std::ios::trunc);
+  if (!output.is_open()) {
+    std::cerr << "Failed to open output file: "
+              << output_file_name
+              << " (" << std::strerror (errno) << ")\n";
+    set_error_code (3);
+    return false;
+  }
+
+  const auto &book_titles = titles();
+  for (std::size_t i = 0; i < book_titles.size(); ++i) {
+    const auto &title = book_titles[i];
+    output << "# " << markdown_escape (title) << "\n\n";
+
+    for (std::size_t quote_index = 0;
+         quote_index < quote_count (title);
+         ++quote_index) {
+      output << "## " << markdown_escape (quote_meta (title, quote_index))
+             << "\n\n";
+
+      const auto &text_lines = quote_text_lines (title, quote_index);
+      std::size_t line_index = 0;
+      if (!text_lines.empty() && text_lines.front().empty())
+        line_index = 1;
+
+      for (; line_index < text_lines.size(); ++line_index) {
+        if (text_lines[line_index].empty())
+          output << ">\n";
+        else
+          output << "> " << markdown_escape (text_lines[line_index]) << '\n';
+      }
+
+      output << "\n### Notes\n\n";
+    }
+  }
+
+  set_error_code (0);
+  return true;
+}
diff --git a/typefactory/convertmarkdown.h b/typefactory/convertmarkdown.h
new file mode 100644
index 0000000..8b20ade
--- /dev/null
+++ b/typefactory/convertmarkdown.h
@@ -0,0 +1,13 @@
+#ifndef CONVERTMARKDOWN_H
+#define CONVERTMARKDOWN_H
+
+#include "converter.h"
+
+class ConverterMarkdown final : public Converter {
+public:
+  using Converter::Converter;
+
+  bool save (const std::string &output_file_name) override;
+};
+
+#endif // CONVERTMARKDOWN_H
diff --git a/typefactory/main.cpp b/typefactory/main.cpp
index 1fa140f..71b3db6 100644
--- a/typefactory/main.cpp
+++ b/typefactory/main.cpp
@@ -4,12 +4,13 @@
 #include <string>
 
 #include "convertlatex.h"
+#include "convertmarkdown.h"
 #include "typefactory.h"
 
 using ConverterFactory = TypeFactory<std::string, Converter, std::string>;
 
-static constexpr std::array<const char *, 1> kSupportedTypes = {
-  "latex"
+static constexpr std::array<const char *, 2> kSupportedTypes = {
+  "latex", "md"
 };
 
 struct CliArgs {
@@ -33,6 +34,7 @@ static void print_supported_types() {
 static ConverterFactory build_converter_factory() {
   ConverterFactory factory;
   factory.registerType<ConverterLatex> ("latex");
+  factory.registerType<ConverterMarkdown> ("md");
   return factory;
 }
 
diff --git a/typefactory/typefactory.pro b/typefactory/typefactory.pro
index bf78f6c..8101ea3 100644
--- a/typefactory/typefactory.pro
+++ b/typefactory/typefactory.pro
@@ -5,10 +5,12 @@ CONFIG -= qt
 
 SOURCES += \
         convertlatex.cpp \
+        convertmarkdown.cpp \
         converter.cpp \
         main.cpp
 
 HEADERS += \
   convertlatex.h \
+  convertmarkdown.h \
   converter.h \
   typefactory.h