+ code to populate the language filter combobox in the content manager

src/common/kiwix/library.cpp

@@ -66,6 +66,10 @@ namespace kiwix {
     return strcmp(a.creator.c_str(), b.creator.c_str()) < 0;
   }
 
+  bool Book::sortByLanguage(const kiwix::Book &a, const kiwix::Book &b) {
+    return strcmp(a.language.c_str(), b.language.c_str()) < 0;
+  }
+
   /* Constructor */
   Library::Library():
     current(""),

src/common/kiwix/library.h

@@ -45,6 +45,7 @@ namespace kiwix {
     static bool sortBySize(const Book &a, const Book &b);
     static bool sortByDate(const Book &a, const Book &b);
     static bool sortByPublisher(const Book &a, const Book &b);
+    static bool sortByLanguage(const Book &a, const Book &b);
 
     string id;
     string path;

src/common/kiwix/manager.cpp

@@ -329,6 +329,22 @@ namespace kiwix {
     return false;
   }
 
+  vector<string> Manager::getBooksLanguages() {
+    std::vector<string> booksLanguages;
+    std::vector<kiwix::Book>::iterator itr;
+    std::map<string, bool> booksLanguagesMap;
+
+    std::sort(library.books.begin(), library.books.end(), kiwix::Book::sortByLanguage);      
+    for ( itr = library.books.begin(); itr != library.books.end(); ++itr ) {
+      if (booksLanguagesMap.find(itr->language) == booksLanguagesMap.end()) {
+	booksLanguagesMap[itr->language] = true;
+	booksLanguages.push_back(itr->language);
+      }
+    }
+    
+    return booksLanguages;
+  }
+
   kiwix::Library Manager::cloneLibrary() {
     return this->library;
   }

src/common/kiwix/manager.h

@@ -20,6 +20,7 @@
 #ifndef KIWIX_MANAGER_H
 #define KIWIX_MANAGER_H
 
+#include <map>
 #include <string>
 #include <sstream>
 #include <time.h>
@@ -63,10 +64,11 @@ namespace kiwix {
     bool updateBookLastOpenDateById(const string id);
     void removeBookPaths();
     bool listBooks(const supportedListMode mode, const supportedListSortBy sortBy, const unsigned int maxSize);
+    vector<string> getBooksLanguages();
 
     string writableLibraryPath;
 
-    vector <std::string> bookIdList;
+    vector<std::string> bookIdList;
     
   protected:
     kiwix::Library library;