Make the library create the reader.

include/library.h

@@ -23,6 +23,7 @@
 #include <string>
 #include <vector>
 #include <map>
+#include <memory>
 
 #include "book.h"
 #include "bookmark.h"
@@ -110,6 +111,7 @@ class Filter {
 class Library
 {
   std::map<std::string, kiwix::Book> m_books;
+  std::map<std::string, std::shared_ptr<Reader>> m_readers;
   std::vector<kiwix::Bookmark> m_bookmarks;
 
  public:
@@ -145,6 +147,7 @@ class Library
   bool removeBookmark(const std::string& zimId, const std::string& url);
 
   Book& getBookById(const std::string& id);
+  std::shared_ptr<Reader> getReaderById(const std::string& id);
 
   /**
    * Remove a book from the library.

src/library.cpp

@@ -19,6 +19,7 @@
 
 #include "library.h"
 #include "book.h"
+#include "reader.h"
 #include "libxml_dumper.h"
 
 #include "tools/base64.h"
@@ -32,6 +33,7 @@
 
 namespace kiwix
 {
+
 /* Constructor */
 Library::Library()
 {
@@ -83,6 +85,20 @@ Book& Library::getBookById(const std::string& id)
   return m_books.at(id);
 }
 
+std::shared_ptr<Reader> Library::getReaderById(const std::string& id)
+{
+  try {
+    return m_readers.at(id);
+  } catch (std::out_of_range& e) {}
+
+  auto book = getBookById(id);
+  if (!book.isPathValid())
+    return nullptr;
+  auto sptr = make_shared<Reader>(book.getPath());
+  m_readers[id] = sptr;
+  return sptr;
+}
+
 unsigned int Library::getBookCount(const bool localBooks,
                                    const bool remoteBooks)
 {