From bf65e1eb20a0ceb988e889e5752b6cc234524d1d Mon Sep 17 00:00:00 2001
From: Varun Gandhi <varun.gandhi@sourcegraph.com>
Date: Fri, 3 Nov 2023 13:35:26 +0800
Subject: [PATCH] squirrel: Do case-insensitive comparison of file extensions
 (#58069)

---
 cmd/symbols/squirrel/language-file-extensions.json | 4 +---
 cmd/symbols/squirrel/util.go                       | 5 ++++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/cmd/symbols/squirrel/language-file-extensions.json b/cmd/symbols/squirrel/language-file-extensions.json
index f05fe872c2b..3e7b60147a5 100644
--- a/cmd/symbols/squirrel/language-file-extensions.json
+++ b/cmd/symbols/squirrel/language-file-extensions.json
@@ -51,9 +51,7 @@
     "h++",
     "hh",
     "h",
-    "hpp",
-    "pc",
-    "pcc"
+    "hpp"
   ],
   "csharp": [
     "cs",
diff --git a/cmd/symbols/squirrel/util.go b/cmd/symbols/squirrel/util.go
index e44019d0f2a..ed38e685c21 100644
--- a/cmd/symbols/squirrel/util.go
+++ b/cmd/symbols/squirrel/util.go
@@ -246,7 +246,10 @@ func (s *SquirrelService) parse(ctx context.Context, repoCommitPath types.RepoCo
 		ext = strings.TrimPrefix(filepath.Ext(repoCommitPath.Path), ".")
 	}
 
-	langName, ok := extToLang[ext]
+	// It is not uncommon to have files with upper-case extensions
+	// like .C, .H, .CPP etc., especially for code developed on
+	// case-insensitive filesystems.
+	langName, ok := extToLang[strings.ToLower(ext)]
 	if !ok {
 		return nil, unrecognizedFileExtensionError
 	}