Languages OPDS feed includes book counts

include/library.h

@@ -154,6 +154,7 @@ class Library
 
  public:
   typedef std::vector<std::string> BookIdCollection;
+  typedef std::map<std::string, int> AttributeCounts;
 
  public:
   Library();
@@ -242,6 +243,13 @@ class Library
    */
   std::vector<std::string> getBooksLanguages() const;
 
+  /**
+   * Get all languagues of the books in the library with counts.
+   *
+   * @return A list of languages with the count of books in each language.
+   */
+  AttributeCounts getBooksLanguagesWithCounts() const;
+
   /**
    * Get all categories of the books in the library.
    *
@@ -345,6 +353,7 @@ private: // types
   typedef const std::string& (Book::*BookStrPropMemFn)() const;
 
 private: // functions
+  AttributeCounts getBookAttributeCounts(BookStrPropMemFn p) const;
   std::vector<std::string> getBookPropValueSet(BookStrPropMemFn p) const;
   BookIdCollection filterViaBookDB(const Filter& filter) const;
   void updateBookDB(const Book& book);

src/library.cpp

@@ -208,18 +208,26 @@ bool Library::writeBookmarksToFile(const std::string& path) const
   return writeTextFile(path, dumper.dumpLibXMLBookmark());
 }
 
-std::vector<std::string> Library::getBookPropValueSet(BookStrPropMemFn p) const
+Library::AttributeCounts Library::getBookAttributeCounts(BookStrPropMemFn p) const
 {
-  std::set<std::string> propValues;
+  AttributeCounts propValueCounts;
 
   for (const auto& pair: m_books) {
     const auto& book = pair.second;
     if (book.getOrigId().empty()) {
-      propValues.insert((book.*p)());
+      propValueCounts[(book.*p)()] += 1;
     }
   }
+  return propValueCounts;
+}
 
-  return std::vector<std::string>(propValues.begin(), propValues.end());
+std::vector<std::string> Library::getBookPropValueSet(BookStrPropMemFn p) const
+{
+  std::vector<std::string> result;
+  for ( const auto& kv : getBookAttributeCounts(p) ) {
+    result.push_back(kv.first);
+  }
+  return result;
 }
 
 std::vector<std::string> Library::getBooksLanguages() const
@@ -227,6 +235,11 @@ std::vector<std::string> Library::getBooksLanguages() const
   return getBookPropValueSet(&Book::getLanguage);
 }
 
+Library::AttributeCounts Library::getBooksLanguagesWithCounts() const
+{
+  return getBookAttributeCounts(&Book::getLanguage);
+}
+
 std::vector<std::string> Library::getBooksCategories() const
 {
   std::set<std::string> categories;

src/opds_dumper.cpp

@@ -160,11 +160,14 @@ std::string OPDSDumper::languagesOPDSFeed() const
 {
   const auto now = gen_date_str();
   kainjow::mustache::list languageData;
-  for ( const auto& languageCode : library->getBooksLanguages() ) {
+  for ( const auto& langAndBookCount : library->getBooksLanguagesWithCounts() ) {
+    const std::string languageCode = langAndBookCount.first;
+    const int bookCount = langAndBookCount.second;
     const auto languageSelfName = getLanguageSelfName(languageCode);
     languageData.push_back(kainjow::mustache::object{
       {"lang_code",  languageCode},
       {"lang_self_name", languageSelfName},
+      {"book_count", to_string(bookCount)},
       {"updated", now},
       {"id", gen_uuid(libraryId + "/languages/" + languageCode)}
     });

static/templates/catalog_v2_languages.xml

@@ -16,6 +16,7 @@
   <entry>
     <title>{{lang_self_name}}</title>
     <dc:language>{{{lang_code}}}</dc:language>
+    <thr:count>{{book_count}}</thr:count>
     <link rel="subsection"
           href="{{endpoint_root}}/entries?lang={{{lang_code}}}"
           type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>

test/server.cpp

@@ -1035,6 +1035,7 @@ TEST_F(LibraryServerTest, catalog_v2_languages)
   <entry>
     <title>English</title>
     <dc:language>eng</dc:language>
+    <thr:count>1</thr:count>
     <link rel="subsection"
           href="/catalog/v2/entries?lang=eng"
           type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
@@ -1044,6 +1045,7 @@ TEST_F(LibraryServerTest, catalog_v2_languages)
   <entry>
     <title>français</title>
     <dc:language>fra</dc:language>
+    <thr:count>1</thr:count>
     <link rel="subsection"
           href="/catalog/v2/entries?lang=fra"
           type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>
@@ -1053,6 +1055,7 @@ TEST_F(LibraryServerTest, catalog_v2_languages)
   <entry>
     <title>русский</title>
     <dc:language>rus</dc:language>
+    <thr:count>1</thr:count>
     <link rel="subsection"
           href="/catalog/v2/entries?lang=rus"
           type="application/atom+xml;profile=opds-catalog;kind=acquisition"/>