[PATCH] Introduce llvm::sys::path::home_directory.

[Peter Collingbourne]

This will be used by the line editor library to derive a default path to
the history file.

I've verified that the Windows bits build (with a mingw64 cross compiler)
but I haven't actually tested them.

http://llvm-reviews.chandlerc.com/D2199

Files:
  include/llvm/Support/Path.h
  lib/Support/Unix/Path.inc
  lib/Support/Windows/Path.inc
  unittests/Support/Path.cpp

Index: include/llvm/Support/Path.h
===================================================================
--- include/llvm/Support/Path.h
+++ include/llvm/Support/Path.h
@@ -306,6 +306,12 @@
 /// @param result Holds the resulting path name.
 void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result);
 
+/// @brief Get the user's home directory.
+///
+/// @param result Holds the resulting path name.
+/// @result True if a home directory is set, false otherwise.
+bool home_directory(SmallVectorImpl<char> &result);
+
 /// @brief Has root name?
 ///
 /// root_name != ""
Index: lib/Support/Unix/Path.inc
===================================================================
--- lib/Support/Unix/Path.inc
+++ lib/Support/Unix/Path.inc
@@ -793,5 +793,19 @@
 }
 
 } // end namespace fs
+
+namespace path {
+
+bool home_directory(SmallVectorImpl<char> &result) {
+  if (char *RequestedDir = getenv("HOME")) {
+    result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+    return true;
+  }
+
+  return false;
+}
+
+} // end namespace path
+
 } // end namespace sys
 } // end namespace llvm
Index: lib/Support/Windows/Path.inc
===================================================================
--- lib/Support/Windows/Path.inc
+++ lib/Support/Windows/Path.inc
@@ -20,6 +20,7 @@
 #include "Windows.h"
 #include <fcntl.h>
 #include <io.h>
+#include <shlobj.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
@@ -1061,6 +1062,22 @@
 }
 } // end namespace fs
 
+namespace path {
+
+bool home_directory(SmallVectorImpl<char> &result) {
+  wchar_t Path[MAX_PATH];
+  if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
+                         SHGFP_TYPE_CURRENT, Path) != S_OK)
+    return false;
+
+  if (UTF16ToUTF8(Path, ::wcslen(Path), result))
+    return false;
+
+  return true;
+}
+
+} // end namespace path
+
 namespace windows {
 llvm::error_code UTF8ToUTF16(llvm::StringRef utf8,
                              llvm::SmallVectorImpl<wchar_t> &utf16) {
Index: unittests/Support/Path.cpp
===================================================================
--- unittests/Support/Path.cpp
+++ unittests/Support/Path.cpp
@@ -210,6 +210,19 @@
 }
 #endif // LLVM_ON_WIN32
 
+TEST(Support, HomeDirectory) {
+#ifdef LLVM_ON_UNIX
+  // This test only makes sense on Unix if $HOME is set.
+  if (::getenv("HOME")) {
+#endif
+    SmallString<128> HomeDir;
+    EXPECT_TRUE(path::home_directory(HomeDir));
+    EXPECT_FALSE(HomeDir.empty());
+#ifdef LLVM_ON_UNIX
+  }
+#endif
+}
+
 class FileSystemTest : public testing::Test {
 protected:
   /// Unique temporary directory in which all created filesystem entities must
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