Grouping duplicates together; Significantly improved scan results file;

src/broom.cpp

@@ -142,8 +142,8 @@ uintmax_t Broom::untrack_unique_contents(std::vector<entry::Entry>& tracked_entr
     return untracked;
 };
 
-// creates a list of duplicate, empty files into a file
-void Broom::create_scan_results_list(const std::vector<entry::Entry> tracked_entries, const std::filesystem::path dir, const std::string filename) {
+// creates a list of duplicate, empty files and puts it into a file
+void Broom::create_scan_results_list(const std::map<std::string, std::vector<entry::Entry>> grouped_duplicates, const std::filesystem::path dir, const std::string filename) {
     if (!std::filesystem::exists(dir)) {
         // create it then
         bool created = std::filesystem::create_directories(dir);
@@ -158,13 +158,21 @@ void Broom::create_scan_results_list(const std::vector<entry::Entry> tracked_ent
         throw "Could not create a scan results file";
     }
 
-    for (const entry::Entry entry : tracked_entries) {
-        // log every entry and its group
-        if (entry.group == group::EMPTY) {
-            outfile << "[EMPTY] " << entry.path << std::endl;
-        } else if (entry.group == group::DUPLICATE) {
-            outfile << "[DUPLICATE] " <<  entry.path << std::endl;
+    auto now = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
+    outfile << ">> Broom scan results file from " << std::ctime(&now) << std::endl << std::endl << std::endl;
+
+    for (const auto record : grouped_duplicates) {
+        if (record.first == "") {
+            outfile << "[EMPTY FILES]" << std::endl;
+        } else {
+            outfile << "[DUPLICATE GROUP]" << std::endl;
         }
+
+        for (const auto duplicate_entry : record.second) {
+            outfile << duplicate_entry.path << std::endl;
+        }
+
+        outfile << std::endl << std::endl;
     }
 
     outfile.close();
@@ -218,4 +226,29 @@ void Broom::mark_as_duplicates(std::vector<entry::Entry>& tracked_entries) {
     }
 };
 
+
+// searches for entries with the same pieces in tracked entries and groups them together as a duplicate group, where the key is the
+// string of pieces. REMOVES EVERYTHING FROM GIVEN TRACKED ENTRIES
+std::map<std::string, std::vector<entry::Entry>> Broom::group_duplicates(std::vector<entry::Entry>& tracked_entries) {
+    std::map<std::string, std::vector<entry::Entry>> duplicate_groups;
+
+    for (auto iter = tracked_entries.begin(); iter != tracked_entries.end(); iter++) {
+      auto map_iter = duplicate_groups.find(iter->pieces);
+      if (map_iter == duplicate_groups.end()) {
+        // first time seeing these pieces
+        std::vector<entry::Entry> occurences;
+        occurences.push_back(*iter);
+        duplicate_groups.insert({iter->pieces, occurences});
+      } else {
+        // add to occurrences this entry
+        duplicate_groups[map_iter->first].push_back(*iter);
+      }
+    };
+
+    // clear the vector
+    tracked_entries.clear();
+
+    return duplicate_groups;
+};
+
 }

src/broom.hpp

@@ -22,6 +22,7 @@ along with broom.  If not, see <https://www.gnu.org/licenses/>.
 
 #include <cstdint>
 #include <vector>
+#include <map>
 
 namespace broom {
 
@@ -50,11 +51,15 @@ public:
     // REMOVES grouped empty files and untracks them after deletion. Returns the amount of removed empty files
     uintmax_t remove_empty_files(std::vector<entry::Entry>& tracked_entries);
 
-    // creates a list of duplicate, empty files into a file
-    void create_scan_results_list(const std::vector<entry::Entry> tracked_entries, const std::filesystem::path dir = ".", const std::string filename = "scan_results.txt");
-
     // marks every entry without any group as a duplicate
     void mark_as_duplicates(std::vector<entry::Entry>& tracked_entries);
+
+    // searches for entries with the same pieces in tracked entries and groups them together as a duplicate group, where the key is the
+    // string of pieces. REMOVES EVERYTHING FROM GIVEN TRACKED ENTRIES
+    std::map<std::string, std::vector<entry::Entry>> group_duplicates(std::vector<entry::Entry>& tracked_entries);
+
+    // creates a list of duplicate, empty files and puts it into a file
+    void create_scan_results_list(const std::map<std::string, std::vector<entry::Entry>> grouped_duplicates, const std::filesystem::path dir = ".", const std::string filename = "scan_results.txt");
 };
 
 }

src/entry.cpp

@@ -38,7 +38,8 @@ Entry::Entry(const std::filesystem::path entry_path) {
 Entry::~Entry() {};
 
 // reads 3 pieces from the beginning, middle and the end of a file, converts them into
-// a convenient hex-encoded string
+// a convenient hex-encoded string. If a file has a size of less than PIECE_SIZE * PIECES_AMOUNT ->
+// constructs pieces from the whole file contents. If a file has no contents at all -> its pieces will be set to ""
 void Entry::get_pieces() {
     std::fstream entry_file;
     entry_file.open(path);
@@ -48,7 +49,11 @@ void Entry::get_pieces() {
     }
 
     char pieces_buffer[PIECE_SIZE * PIECES_AMOUNT];
-    if (filesize <= PIECE_SIZE * PIECES_AMOUNT) {
+    if (filesize == 0) {
+        // EMPTY file !
+        pieces = "";
+        return;
+    } else if (filesize <= PIECE_SIZE * PIECES_AMOUNT) {
         // can`t take whole 3 pieces !
         // read the whole file then
         entry_file.read(pieces_buffer, filesize);

src/entry.hpp

@@ -30,7 +30,7 @@ along with broom.  If not, see <https://www.gnu.org/licenses/>.
 
 namespace entry {
 // 3 pieces (beginning, middle and end of the file)
-const uint8_t PIECE_SIZE = 85;
+const uint8_t PIECE_SIZE = 75;
 const uint8_t PIECES_AMOUNT = 3;
 
 // A wrapper for every file in filesystem with all necessary information
@@ -45,7 +45,8 @@ public:
     ~Entry();
 
     // reads 3 pieces from the beginning, middle and the end of a file, converts them into
-    // a convenient hex-encoded string
+    // a convenient hex-encoded string. If a file has a size of less than PIECE_SIZE * PIECES_AMOUNT ->
+    // constructs pieces from the whole file contents. If a file has no contents at all -> its pieces will be set to ""
     void get_pieces();
 
     // REMOVE entry from the disk

src/main.cpp

@@ -176,14 +176,13 @@ int main(int argc, char* argv[]) {
 
         std::cout << "[INFO] " << tracked_entries.size() << " files left being tracked" << std::endl;
 
-        if (tracked_entries.size() > 0) {
-            // now only files with a non-unique size and contents are being tracked
-            // are they REALLY duplicates ?
-            // better to leave the REALL cleanup for the user, saving these entries in a file, than doing a blind and possibly destructive purge
-            broom.create_scan_results_list(tracked_entries);
-            std::cout << "[INFO] Created scan results file" << std::endl;
-        }
+        auto grouped_duplicates = broom.group_duplicates(tracked_entries);
 
+        // now only files with a non-unique size and contents are being tracked
+        // are they REALLY duplicates ?
+        // better to leave the REALL cleanup for the user, saving these entries in a file, than doing a blind and possibly destructive purge
+        broom.create_scan_results_list(grouped_duplicates );
+        std::cout << "[INFO] Created scan results file" << std::endl;
 
     } catch(const std::exception& e) {
         std::cerr