[FileSystem] Add expand_tilde function

In D54435 there was some discussion about the expand_tilde flag for
real_path that I wanted to expose through the VFS. The consensus is that
these two things should be separate functions. Since we already have the
code for this I went ahead and added a function expand_tilde that does
just that.

Differential revision: https://reviews.llvm.org/D54448

llvm-svn: 346776

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/Support/Windows/Path.inc b/llvm/lib/Support/Windows/Path.inc
index 45d73ae3dfe..678c9a819d8 100644
--- a/llvm/lib/Support/Windows/Path.inc
+++ b/llvm/lib/Support/Windows/Path.inc
@@ -1253,6 +1253,17 @@ static void expandTildeExpr(SmallVectorImpl<char> &Path) {
   Path.insert(Path.begin() + 1, HomeDir.begin() + 1, HomeDir.end());
 }
 
+void expand_tilde(const Twine &path, SmallVectorImpl<char> &dest) {
+  dest.clear();
+  if (path.isTriviallyEmpty())
+    return;
+
+  path.toVector(dest);
+  expandTildeExpr(dest);
+
+  return;
+}
+
 std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
                           bool expand_tilde) {
   dest.clear();