Add dir based open & create calls, init files from default names unde…

…r dir

include/nudb/basic_store.hpp

@@ -343,6 +343,36 @@ class basic_store
         error_code& ec,
         Args&&... args);
 
+    /** Open a database.
+
+        The database identified by the specified directory
+        under which default data and key paths are opened.
+
+        @par Requirements
+
+        The database must be not be open.
+
+        @par Thread safety
+
+        Not thread safe. The caller is responsible for
+        ensuring that no other member functions are
+        called concurrently.
+
+        @param dir_path The path to the directory containing data
+        and key files.
+
+        @param ec Set to the error, if any occurred.
+
+        @param args Optional arguments passed to @b File constructors.
+
+    */
+    template<class... Args>
+    void
+    open(
+        path_type const& dir_path,
+        error_code& ec,
+        Args&&... args);
+
     /** Fetch a value.
 
         The function checks the database for the specified

include/nudb/create.hpp

@@ -110,6 +110,31 @@ create(
     error_code& ec,
     Args&&... args);
 
+/** Create a new database in specified directory.
+
+    Similar to create method with explicit dat,
+    key, and log paths, with the default filenames
+    being used.
+
+    @param dir_path The path to the data file.
+
+*/
+template<
+    class Hasher,
+    class File = native_file,
+    class... Args
+>
+void
+create(
+    path_type const& dir_path,
+    std::uint64_t appnum,
+    std::uint64_t salt,
+    nsize_t key_size,
+    nsize_t blockSize,
+    float load_factor,
+    error_code& ec,
+    Args&&... args);
+
 } // nudb
 
 #include <nudb/impl/create.ipp>

include/nudb/detail/format.hpp

@@ -46,6 +46,21 @@ value size          up to 32 bits (or 32-bit builds can't read it)
 
 static std::size_t constexpr currentVersion = 2;
 
+const std::string& default_dat_file() {
+  static const std::string ddf("nudb.dat");
+  return ddf;
+}
+
+const std::string& default_key_file() {
+  static const std::string dkf("nudb.key");
+  return dkf;
+}
+
+const std::string& default_log_file() {
+  static const std::string dkf("nudb.log");
+  return dkf;
+}
+
 struct dat_file_header
 {
     static std::size_t constexpr size =

include/nudb/impl/basic_store.ipp

@@ -13,6 +13,7 @@
 #include <boost/assert.hpp>
 #include <cmath>
 #include <memory>
+#include <boost/filesystem.hpp>
 
 #ifndef NUDB_DEBUG_LOG
 #define NUDB_DEBUG_LOG 0
@@ -187,6 +188,32 @@ open(
     ctx_->insert(*this);
 }
 
+template<class Hasher, class File>
+template<class... Args>
+void
+basic_store<Hasher, File>::
+open(
+    path_type const& dir_path,
+    error_code& ec,
+    Args&&... args)
+{
+  BOOST_ASSERT(boost::filesystem::exists(dir_path));
+
+  boost::filesystem::path fs_dir_path(dir_path);
+
+  boost::filesystem::path dat_path =
+    fs_dir_path / detail::default_dat_file();
+  boost::filesystem::path key_path =
+    fs_dir_path / detail::default_key_file();
+  boost::filesystem::path log_path =
+    fs_dir_path / detail::default_log_file();
+
+  open(dat_path.string(),
+       key_path.string(),
+       log_path.string(),
+       ec, args...);
+}
+
 template<class Hasher, class File>
 void
 basic_store<Hasher, File>::

include/nudb/impl/create.ipp

@@ -17,6 +17,7 @@
 #include <random>
 #include <stdexcept>
 #include <utility>
+#include <boost/filesystem.hpp>
 
 namespace nudb {
 
@@ -158,6 +159,46 @@ fail:
         erase_file(log_path);
 }
 
+template<
+    class Hasher,
+    class File,
+    class... Args
+>
+void
+create(
+    path_type const& dir_path,
+    std::uint64_t appnum,
+    std::uint64_t salt,
+    nsize_t key_size,
+    nsize_t blockSize,
+    float load_factor,
+    error_code& ec,
+    Args&&... args)
+{
+  if(!boost::filesystem::exists(dir_path))
+      boost::filesystem::create_directories(dir_path);
+
+  boost::filesystem::path fs_dir_path(dir_path);
+
+  boost::filesystem::path dat_path =
+    fs_dir_path / detail::default_dat_file();
+  boost::filesystem::path key_path =
+    fs_dir_path / detail::default_key_file();
+  boost::filesystem::path log_path =
+    fs_dir_path / detail::default_log_file();
+
+  create<Hasher, File, Args...>(dat_path.string(),
+                                key_path.string(),
+                                log_path.string(),
+                                appnum,
+                                salt,
+                                key_size,
+                                blockSize,
+                                load_factor,
+                                ec,
+                                args...);
+}
+
 } // nudb
 
 #endif