================
@@ -164,6 +164,40 @@ TEST_F(MatchFilePathTest, Path) {
   EXPECT_FALSE(match("foo\\", R"(foo*\)"));
 }
 
+TEST_F(MatchFilePathTest, DoubleAsterisk) {
+  EXPECT_TRUE(match("a/b/c/d.cpp", "**b**"));
+  EXPECT_TRUE(match("a/b/c/d.cpp", "**/b/**"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "**d_*"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "**/d_*"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "**d_**"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "**/d_**"));
+
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "**/b/c/**"));
+
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "a/**/b/c/d_e.cpp"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "a/**/c/d_e.cpp"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "a/**/b/**/d_e.cpp"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "**/b/**/d_e.cpp"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "a/**/**/b/**"));
+
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "**/d"));
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "**/b/d"));
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "**/b/d/**"));
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "**/b/c/"));
+
+  // Multiple consecutive asterisks are treated as **
+  EXPECT_TRUE(match("a/b/c/d.cpp", "***b****"));
+  EXPECT_TRUE(match("a/b/c/d.cpp", "****/b/***"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "***d_**"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "****/d_*"));
+  EXPECT_TRUE(match("a/b/c/d_e.cpp", "***/b/c/*****"));
+
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "*****/d"));
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "***/b/d"));
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "*****/b/d/***"));
+  EXPECT_FALSE(match("a/b/c/d_e.cpp", "***/b/c"));
----------------
ameerj wrote:

> should there be some tests with repetition?

I'm not sure I understand what you are asking.
Can you provide examples of the path and the ignore pattern that you expect to 
be problematic?

> if we are doing this an saying "Its like .gitignore" should we support

I am only indicating that the `**` glob pattern is implemented in .gitignore, 
and we follow the same rules they do for this specific pattern.

I do not think the current implementation could easily support theese glob 
patterns the same way .gitignore does. 
My understanding is that there is some "state" where a lower level `!` negates 
an earlier match/ignore?
I think the current implementation only considers one pattern in the file at a 
time, in isolation of all other lines in the .clang-format-ignore file.

@owenca may understand better and have an opinion.

https://github.com/llvm/llvm-project/pull/110560
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