import std.file,
  std.string;

enum {
  WEBPUB_MENU = 1,
  WEBPUB_ITEM
}

class WebPubMenu {
  int    m_type;
  char[] m_title;
  char[] m_url;
  WebPubMenu[] m_menuItems;
  WebPubMenu m_parent;

  this() {}
  
  this(char[] title, int type) {
    m_title = title.dup;
    m_type  = type;
  }

  void add(char[] title, char[] url) {
    WebPubMenu mi = new WebPubMenu(title, WEBPUB_ITEM);
    mi.m_url   = url.dup;

    m_menuItems ~= mi;
  }

  void add(WebPubMenu mi) {
    m_menuItems ~= mi;
  }
}

void printMenu(WebPubMenu menu, int idx=0) {
  foreach (WebPubMenu m; menu.m_menuItems) {
    printf("%.*s%.*s:", "".rjustify(idx*4), m.m_title);
    if (m.m_type == WEBPUB_MENU) {
      printf("\n");
      printMenu(m, idx + 1);
    } else {
      printf(" %.*s\n", m.m_url);
    }
  }
}

int main(char[][] args) {
  char[] inputFileName = null, outputFileName = null;
  byte verbose = 0;

  for (int idx=1; idx < args.length; idx++) {
    if (args[idx] == "-v")           { verbose = 1;                }
    else if (inputFileName == null)  { inputFileName = args[idx];  }
    else if (outputFileName == null) { outputFileName = args[idx]; }
  }

  if (inputFileName == null || outputFileName == null) {
    printf("webpub [-v] input output\n");
    return -1;
  }
  
  char[] input = cast(char[])std.file.read(inputFileName);
  byte inBlockComment = 0;
  int lineNo = 0;

  WebPubMenu root = new WebPubMenu();
  WebPubMenu curr = root;

  foreach (char[] line; input.splitlines()) {
    lineNo += 1;
    line = line.chomp().strip();

    if (line.length == 0) {
      continue;
    } else if (inBlockComment && line.find("*/") != -1) {
      inBlockComment = 0;
      continue;
    } else if (inBlockComment == 1) {
      continue;
    } else if (line.find("/*") == 0) {
      inBlockComment = 1;
      continue;
    } else if (line.find("#") == 0) {
      continue;
    } else {
      if (line.find("{") != -1) {
        WebPubMenu n = new WebPubMenu(line.chomp("{").strip(), WEBPUB_MENU);
        n.m_parent = curr;
        curr.add(n);
        curr = n;
      } else if (line.find("}") == 0) {
        curr = curr.m_parent;
      } else if (line.find("=>") != -1) {
        char[][] items = line.split("=>");
        curr.add(items[0].strip(), items[1].strip());
      } else {
        printf("WARNING: parse error at line %i '%.*s'\n", lineNo, line);
        printf("         line ignored, continuing parsing.\n");
      }
    }
  }

  printMenu(root);
  
  return 0;
}

/** Example input file:
# Jeremy's Home Page
Home  => home.html
About => about.html

Computing {
  Programming {
    D           => d.html
    C++         => cpp.html
    Io          => io.html
    Python      => python.html
  }
  OSes {
    Linux       => linux.html
    NetBSD      => netbsd.html
    /*
    Windoze     => 404.html
    BeOS        => beos.html
    V2OS        => v2os.html
    */
  }
}

Family => family.html
*/