Introduce addAlias method.

include/zim/item.h

@@ -90,6 +90,7 @@ namespace zim
 
 #ifdef ZIM_PRIVATE
       cluster_index_type getClusterIndex() const;
+      blob_index_type getBlobIndex() const;
 #endif
 
     private: // functions

include/zim/writer/creator.h

@@ -195,6 +195,36 @@ namespace zim
             const std::string& targetpath,
             const Hints& hints = Hints());
 
+
+        /**
+         * Add a alias of a existing entry.
+         *
+         * The existing entry pointed by `targetPath` is cloned and updated with
+         * `path` and `title`.
+         *
+         * The alias entry will shared the same type (redirection or item)
+         * and namespace than `targetPath`.
+         *
+         * If the `targetPath` is a item, the new entry will be item pointing
+         * to the same data than `targetPath` item. (Not a redirection to `targetPath`).
+         * However, the alias entry is not counted in the media type counter
+         * and it is not fulltext indexed (only title indexed).
+         *
+         * Hints can be given to influence creator handling (front article, ...)
+         * as it is done for redirection.
+         *
+         * @param path the path of the alias
+         * @param title the title of the alias
+         * @param targetPath the path of the aliased entry.
+         * @param hints hints associated to the alias.
+         */
+        void addAlias(
+            const std::string& path,
+            const std::string& title,
+            const std::string& targetPath,
+            const Hints& hints = Hints()
+        );
+
         /**
          * Finalize the zim creation.
          */

src/item.cpp

@@ -88,3 +88,8 @@ cluster_index_type Item::getClusterIndex() const
 {
   return m_dirent->getClusterNumber().v;
 }
+
+blob_index_type Item::getBlobIndex() const
+{
+  return m_dirent->getBlobNumber().v;
+}

src/writer/_dirent.h

@@ -58,6 +58,7 @@ namespace zim
             ns(ns)
           {};
           Redirect(Redirect&& r) = default;
+          Redirect(const Redirect& r) = default;
           ~Redirect() {};
           TinyString targetPath;
           NS ns;
@@ -96,6 +97,21 @@ namespace zim
           resolved(std::move(r)),
           tag(DirentInfo::RESOLVED)
         {}
+        DirentInfo(const DirentInfo& other):
+          tag(other.tag)
+        {
+          switch (tag) {
+            case DIRECT:
+              new(&direct) Direct(other.direct);
+              break;
+            case REDIRECT:
+              new(&redirect) Redirect(other.redirect);
+              break;
+            case RESOLVED:
+              new(&resolved) Resolved(other.resolved);
+              break;
+          }
+        }
         DirentInfo::Direct& getDirect() {
           ASSERT(tag, ==, DIRECT);
           return direct;
@@ -153,6 +169,9 @@ namespace zim
         // Creator for a "redirection" dirent
         Dirent(NS ns, const std::string& path, const std::string& title, NS targetNs, const std::string& targetPath);
 
+        // Creator for a "alias" dirent. Reuse the namespace of the targeted Dirent.
+        Dirent(const std::string& path, const std::string& title, const Dirent& target);
+
         // Creator for "temporary" dirent, used to search for dirent in container.
         // We use them in url ordered container so we only need to set the namespace and the path.
         // Other value are irrelevant.

src/writer/creator.cpp

@@ -206,6 +206,23 @@ namespace zim
       data->handle(dirent, hints);
     }
 
+    void Creator::addAlias(const std::string& path, const std::string& title, const std::string& targetPath, const Hints& hints)
+    {
+      checkError();
+      Dirent tmpDirent(NS::C, targetPath);
+      auto existing_dirent_it = data->dirents.find(&tmpDirent);
+
+      if (existing_dirent_it == data->dirents.end()) {
+        std::ostringstream ss;
+        ss << "Impossible to alias C/" << targetPath << " as C/" << path << std::endl;
+        ss << "C/" << targetPath << " doesn't exist." << std::endl;
+        throw InvalidEntry(ss.str());
+      }
+
+      auto dirent = data->createAliasDirent(path, title, **existing_dirent_it);
+      data->handle(dirent, hints);
+    }
+
     void Creator::finishZimCreation()
     {
       checkError();
@@ -598,6 +615,13 @@ namespace zim
       return dirent;
     }
 
+    Dirent* CreatorData::createAliasDirent(const std::string& path, const std::string& title, const Dirent& target)
+    {
+      auto dirent = pool.getAliasDirent(path, title, target);
+      addDirent(dirent);
+      return dirent;
+    }
+
     Cluster* CreatorData::closeCluster(bool compressed)
     {
       Cluster *cluster;

src/writer/creatordata.h

@@ -74,6 +74,7 @@ namespace zim
         Dirent* createDirent(NS ns, const std::string& path, const std::string& mimetype, const std::string& title);
         Dirent* createItemDirent(const Item* item);
         Dirent* createRedirectDirent(NS ns, const std::string& path, const std::string& title, NS targetNs, const std::string& targetPath);
+        Dirent* createAliasDirent(const std::string& path, const std::string& title, const Dirent& target);
         Cluster* closeCluster(bool compressed);
 
         void setEntryIndexes();

src/writer/dirent.cpp

@@ -72,6 +72,17 @@ Dirent::Dirent(NS ns, const std::string& path, const std::string& title, NS targ
     frontArticle(false)
 {}
 
+Dirent::Dirent(const std::string& path, const std::string& title, const Dirent& target)
+  : pathTitle(path, title),
+    mimeType(target.mimeType),
+    idx(0),
+    info(target.info),
+    offset(0),
+    _ns(target._ns),
+    removed(false),
+    frontArticle(false)
+{}
+
 NS Dirent::getRedirectNs() const {
   return info.getRedirect().ns;
 }

src/writer/direntPool.h

@@ -44,6 +44,14 @@ namespace zim
           delete [] (reinterpret_cast<char*>(pool));
         }
 
+        /* Return a *NOT constructed* pointer to a dirent */
+        Dirent* getDirentSlot() {
+          if (direntIndex == 0xFFFF) {
+            allocate_new_pool();
+          }
+          auto dirent = pools.back() + direntIndex++;
+          return dirent;
+        }
 
       public:
         DirentPool() :
@@ -65,22 +73,22 @@ namespace zim
         }
 
         Dirent* getClassicDirent(NS ns, const std::string& path, const std::string& title, uint16_t mimetype) {
-          if (direntIndex == 0xFFFF) {
-            allocate_new_pool();
-          }
-          auto dirent = pools.back() + direntIndex++;
+          auto dirent = getDirentSlot();
           new (dirent) Dirent(ns, path, title, mimetype);
           return dirent;
         }
 
         Dirent* getRedirectDirent(NS ns, const std::string& path, const std::string& title, NS targetNs, const std::string& targetPath) {
-          if (direntIndex == 0xFFFF) {
-            allocate_new_pool();
-          }
-          auto dirent = pools.back() + direntIndex++;
+          auto dirent = getDirentSlot();
           new (dirent) Dirent(ns, path, title, targetNs, targetPath);
           return dirent;
         }
+
+        Dirent* getAliasDirent(const std::string& path, const std::string& title, const Dirent& target) {
+          auto dirent = getDirentSlot();
+          new (dirent) Dirent(path, title, target);
+          return dirent;
+        }
     };
   }
 }

src/writer/tinyString.h

@@ -48,7 +48,13 @@ namespace zim
           t.m_data = nullptr;
           t.m_size = 0;
         };
-        TinyString(const TinyString& t) = delete;
+        TinyString(const TinyString& t) :
+          m_data(new char[(uint16_t)t.m_size]),
+          m_size(t.m_size)
+        {
+          std::memcpy(m_data, t.m_data, m_size);
+        }
+
         ~TinyString() {
           if (m_data) {
             delete[] m_data;

test/creator.cpp

@@ -185,11 +185,13 @@ TEST(ZimCreator, createZim)
   // Be sure that title order is not the same that url order
   item = std::make_shared<TestItem>("foo2", "AFoo", "Foo2Content");
   creator.addItem(item);
+  creator.addAlias("foo_bis", "The same Foo", "foo2");
   creator.addMetadata("Title", "This is a title");
   creator.addIllustration(48, "PNGBinaryContent48");
   creator.addIllustration(96, "PNGBinaryContent96");
   creator.setMainPath("foo");
-  creator.addRedirection("foo3", "FooRedirection", "foo"); // No a front article.
+  creator.addRedirection("foo3", "FooRedirection", "foo"); // Not a front article.
+  creator.addAlias("foo_ter", "The same redirection", "foo3", {{ zim::writer::FRONT_ARTICLE, true}}); // a clone of the previous redirect, but as a front article.
   creator.addRedirection("foo4", "FooRedirection", "NoExistant", {{zim::writer::FRONT_ARTICLE, true}}); // Invalid redirection, must be removed by creator
   creator.finishZimCreation();
 
@@ -200,15 +202,15 @@ TEST(ZimCreator, createZim)
   header.read(*reader);
   ASSERT_TRUE(header.hasMainPage());
 #if defined(ENABLE_XAPIAN)
-  entry_index_type nb_entry = 12; // counter + 2*illustration + xapiantitleIndex + xapianfulltextIndex + foo + foo2 + foo3 + Title + mainPage + titleListIndexes*2
+  entry_index_type nb_entry = 14; // counter + 2*illustration + xapiantitleIndex + xapianfulltextIndex + foo + foo2 + foo_bis + foo3 + foo_ter + Title + mainPage + titleListIndexes*2
   int xapian_mimetype = 0;
   int listing_mimetype = 1;
   int png_mimetype = 2;
   int html_mimetype = 3;
   int plain_mimetype = 4;
   int plainutf8_mimetype = 5;
 #else
-  entry_index_type nb_entry = 10; // counter + 2*illustration + foo + foo2 + foo3 + Title + mainPage + titleListIndexes*2
+  entry_index_type nb_entry = 12; // counter + 2*illustration + foo + foo_bis + foo2 + foo3 + foo_ter + Title + mainPage + titleListIndexes*2
   int listing_mimetype = 0;
   int png_mimetype = 1;
   int html_mimetype = 2;
@@ -235,6 +237,12 @@ TEST(ZimCreator, createZim)
   dirent = direntAccessor.getDirent(entry_index_t(direntIdx++));
   test_redirect_dirent(dirent, 'C', "foo3", "FooRedirection", entry_index_t(0));
 
+  dirent = direntAccessor.getDirent(entry_index_t(direntIdx++));
+  test_article_dirent(dirent, 'C', "foo_bis", "The same Foo", html_mimetype, cluster_index_t(0), foo2BlobIndex);
+
+  dirent = direntAccessor.getDirent(entry_index_t(direntIdx++));
+  test_redirect_dirent(dirent, 'C', "foo_ter", "The same redirection", entry_index_t(0));
+
   dirent = direntAccessor.getDirent(entry_index_t(direntIdx++));
   test_article_dirent(dirent, 'M', "Counter", None, plain_mimetype, cluster_index_t(0), None);
   auto counterBlobIndex = dirent->getBlobNumber();
@@ -297,7 +305,7 @@ TEST(ZimCreator, createZim)
   clusterOffset = offset_t(reader->read_uint<offset_type>(offset_t(clusterPtrPos + 8)));
   cluster = Cluster::read(*reader, clusterOffset);
   ASSERT_EQ(cluster->getCompression(), Cluster::Compression::None);
-  ASSERT_EQ(cluster->count(), blob_index_t(nb_entry-6)); // 6 entries are either compressed or redirections
+  ASSERT_EQ(cluster->count(), blob_index_t(nb_entry-8)); // 7 entries are either compressed or redirections + 1 entry is a clone of content
 
   ASSERT_EQ(header.getTitleIdxPos(), (clusterOffset+cluster->getBlobOffset(v0BlobIndex)).v);
 
@@ -314,20 +322,23 @@ TEST(ZimCreator, createZim)
     6, 0, 0, 0,
     7, 0, 0, 0,
     8, 0, 0, 0,
-    9, 0, 0, 0
+    9, 0, 0, 0,
+    10, 0, 0, 0,
+    11, 0, 0, 0
 #if defined(ENABLE_XAPIAN)
-    ,10, 0, 0, 0
-    ,11, 0, 0, 0
+    ,12, 0, 0, 0
+    ,13, 0, 0, 0
 #endif
     };
   ASSERT_EQ(blob0Data, expectedBlob0Data);
 
   blob = cluster->getBlob(v1BlobIndex);
-  ASSERT_EQ(blob.size(), 2*sizeof(title_index_t));
+  ASSERT_EQ(blob.size(), 3*sizeof(title_index_t));
   std::vector<char> blob1Data(blob.data(), blob.end());
   std::vector<char> expectedBlob1Data = {
     1, 0, 0, 0,
-    0, 0, 0, 0
+    0, 0, 0, 0,
+    4, 0, 0, 0 // "The same redirection" is the 5th entry "by title order"
   };
   ASSERT_EQ(blob1Data, expectedBlob1Data);
 

test/search.cpp

@@ -64,6 +64,7 @@ TEST(Search, indexFullPath)
 
   auto item = std::make_shared<TestItem>("testPath", "text/html", "Test Article", "This is a test article");
   creator.addItem(item);
+  creator.addAlias("anotherPath", "Another Test Article", "testPath");
 
   creator.setMainPath("testPath");
   creator.addMetadata("Title", "Test zim");
@@ -76,9 +77,14 @@ TEST(Search, indexFullPath)
   auto search = searcher.search(query);
 
   ASSERT_NE(0, search.getEstimatedMatches());
-  auto result = search.getResults(0, archive.getEntryCount());
-  ASSERT_EQ(result.begin().getPath(), "testPath");
-  ASSERT_EQ(result.begin().getDbData().substr(0, 2), "C/");
+  auto results = search.getResults(0, archive.getEntryCount());
+
+  auto result = results.begin();
+  ASSERT_EQ(result.getPath(), "testPath");
+  ASSERT_EQ(result.getDbData().substr(0, 2), "C/");
+
+  result++;
+  ASSERT_EQ(result, results.end());
 }
 
 TEST(Search, fulltextSnippet)
@@ -118,6 +124,7 @@ TEST(Search, multiSearch)
   creator.addItem(std::make_shared<TestItem>("path2", "text/html", "Test Article001", "This is a test article. Super. temp0"));
   creator.addItem(std::make_shared<TestItem>("path3", "text/html", "Test Article2", "This is a test article. Super."));
   creator.addItem(std::make_shared<TestItem>("path4", "text/html", "Test Article23", "This is a test article. bis."));
+  creator.addAlias("path5", "Test Article5", "path0"); // Should not be fulltext indexed
 
   creator.setMainPath("path0");
   creator.finishZimCreation();
@@ -133,7 +140,7 @@ TEST(Search, multiSearch)
   zim::Query query("test article");
   auto search0 = searcher.search(query);
 
-  ASSERT_EQ(archive.getEntryCount(), (unsigned int)search0.getEstimatedMatches());
+  ASSERT_EQ(5U, (unsigned int)search0.getEstimatedMatches());
   auto result0 = search0.getResults(0, 2);
   ASSERT_EQ(result0.size(), 2);
   auto it0 = result0.begin();