Ignore all Git configuration files and directories

Suggested by Amitai Schleier via private mail.

v23/util.go

@@ -341,12 +341,22 @@ func getSubdirs(filename CurrPath) []RelPath {
 
 func isIgnoredFilename(filename string) bool {
 	switch filename {
-	case "CVS", ".svn", ".git", ".hg", ".idea":
+	case "CVS", ".svn", ".hg", ".idea":
 		return true
 	}
+	switch {
+
+	case hasPrefix(filename, ".#"):
+		// https://www.gnu.org/software/trans-coord/manual/cvs/cvs.html#cvsignore
+		return true
+	case hasPrefix(filename, ".git"):
+		return true
+	case hasSuffix(filename, "~"):
+		return true
+	}
+
+	return false
 
-	// https://www.gnu.org/software/trans-coord/manual/cvs/cvs.html#cvsignore
-	return hasPrefix(filename, ".#") || hasSuffix(filename, "~")
 }
 
 // Checks whether a file is already committed to the CVS repository.

v23/util_test.go

@@ -204,9 +204,10 @@ func (s *Suite) Test_isIgnoredFilename(c *check.C) {
 	}
 
 	test("filename.mk", false)
-	test(".gitignore", false)
+	test(".github", true)
+	test(".gitignore", true)
 	test(".git", true)
-	test(".gitattributes", false)
+	test(".gitattributes", true)
 	test("CVS", true)
 	test(".svn", true)
 	test(".hg", true)