[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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342449 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/libclang/CIndexCodeCompletion.cpp b/tools/libclang/CIndexCodeCompletion.cpp
index 766745ddea..4e4dcdb58c 100644
--- a/tools/libclang/CIndexCodeCompletion.cpp
+++ b/tools/libclang/CIndexCodeCompletion.cpp
@@ -499,6 +499,10 @@ static unsigned long long getContextsForContextKind(
       contexts = CXCompletionContext_NaturalLanguage;
       break;
     }
+    case CodeCompletionContext::CCC_IncludedFile: {
+      contexts = CXCompletionContext_IncludedFile;
+      break;
+    }
     case CodeCompletionContext::CCC_SelectorName: {
       contexts = CXCompletionContext_ObjCSelectorName;
       break;