[CodeComplete] Add completions for filenames in #include directives.

Summary:
The dir component ("somedir" in #include <somedir/fo...>) is considered fixed.
We append "foo" to each directory on the include path, and then list its files.

Completions are of the forms:
 #include <somedir/fo^
                   foo.h>
                   fox/

The filter is set to the filename part ("fo"), so fuzzy matching can be
applied to the filename only.

No fancy scoring/priorities are set, and no information is added to
CodeCompleteResult to make smart scoring possible. Could be in future.

Reviewers: ilya-biryukov

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D52076

llvm-svn: 342449

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index dcff51ad61b..48b3571ab27 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -445,6 +445,13 @@ bool Preprocessor::SetCodeCompletionPoint(const FileEntry *File,
   return false;
 }
 
+void Preprocessor::CodeCompleteIncludedFile(llvm::StringRef Dir,
+                                            bool IsAngled) {
+  if (CodeComplete)
+    CodeComplete->CodeCompleteIncludedFile(Dir, IsAngled);
+  setCodeCompletionReached();
+}
+
 void Preprocessor::CodeCompleteNaturalLanguage() {
   if (CodeComplete)
     CodeComplete->CodeCompleteNaturalLanguage();