From a97a839d6e0dad2acfa327ae320bba41183cdd55 Mon Sep 17 00:00:00 2001
From: Ingo Ruhnke <grumbel@gmail.com>
Date: Mon, 18 Aug 2014 11:33:04 +0200
Subject: [PATCH] Added FileSystem::exists(), FileSystem::is_directory() and
 FileSystem::mkdir()

---
 src/util/file_system.cpp | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/file_system.hpp | 11 ++++++++++
 2 files changed, 66 insertions(+)

diff --git a/src/util/file_system.cpp b/src/util/file_system.cpp
index 524d4a530..5b2ee00b5 100644
--- a/src/util/file_system.cpp
+++ b/src/util/file_system.cpp
@@ -17,10 +17,65 @@
 #include "util/log.hpp"
 
 #include <sstream>
+#include <stdexcept>
+#include <sys/stat.h>
+#include <sys/types.h>
 #include <vector>
 
+#ifdef _WIN32
+#  include <shlwapi.h>
+#else
+#  include <unistd.h>
+#endif
+
 namespace FileSystem {
 
+bool exists(const std::string& path)
+{
+#ifdef _WIN32
+  DWORD dwAttrib = GetFileAttributes(path.c_str());
+
+  return (dwAttrib != INVALID_FILE_ATTRIBUTES &&
+          !(dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
+#else
+  return !access(path.c_str(), F_OK);
+#endif
+}
+
+bool is_directory(const std::string& path)
+{
+  struct stat info;
+
+  if (stat(path.c_str(), &info ) != 0)
+  {
+    // access error
+    return false;
+  }
+  else if (info.st_mode & S_IFDIR)
+  {
+    return true;
+  }
+  else
+  {
+    return false;
+  }
+}
+
+void mkdir(const std::string& directory)
+{
+#ifdef _WIN32
+  if (!CreateDirectory(directory.c_str()))
+  {
+    throw std::runtime_error("failed to create directory: "  + directory);
+  }
+#else
+  if (::mkdir(directory.c_str(), 0777) != 0)
+  {
+    throw std::runtime_error("failed to create directory: "  + directory);
+  }
+#endif
+}
+
 std::string dirname(const std::string& filename)
 {
   std::string::size_type p = filename.find_last_of('/');
diff --git a/src/util/file_system.hpp b/src/util/file_system.hpp
index 0e9783504..ff300026b 100644
--- a/src/util/file_system.hpp
+++ b/src/util/file_system.hpp
@@ -19,6 +19,17 @@
 
 namespace FileSystem {
 
+/** Returns true if the given path is a directory */
+bool is_directory(const std::string& path);
+
+/** Return true if the given file exists */
+bool exists(const std::string& path);
+
+/**
+ *  Create the given directory
+ */
+void mkdir(const std::string& directory);
+
 /**
  * returns the path of the directory the file is in
  */
-- 
2.11.0