clang-tools: don't hardcode list of tools

Currently clang-tools' derivation uses a hardcoded list of names to
distinguish between what's a compiler-like binary and what's a tool-like
binary (so that e.g. clang-tidy is included in the derivation, but
clang-13 - not).

Because Clang's tools follow a common naming convention
(clang-somethingsomething), I think it's easier if we just used a simple
regular expression in place of the hardcoded list.

pkgs/development/tools/clang-tools/default.nix

@@ -4,31 +4,44 @@ let
   unwrapped = llvmPackages.clang-unwrapped;
 
 in stdenv.mkDerivation {
+  inherit unwrapped;
+
   pname = "clang-tools";
   version = lib.getVersion unwrapped;
-
   dontUnpack = true;
-
   clang = llvmPackages.clang;
-  inherit unwrapped;
 
   installPhase = ''
     runHook preInstall
 
     mkdir -p $out/bin
 
-    substituteAll ${./wrapper} $out/bin/clangd
+    for tool in $unwrapped/bin/clang-*; do
-    chmod +x $out/bin/clangd
+      tool=$(basename "$tool")
-    for tool in \
+
-      clang-apply-replacements \
+      # Compilers have their own derivation, no need to include them here:
-      clang-check \
+      if [[ $tool == "clang-cl" || $tool == "clang-cpp" ]]; then
-      clang-format \
+        continue
-      clang-rename \
+      fi
-      clang-tidy
+
-    do
+      # Clang's derivation produces a lot of binaries, but the tools we are
+      # interested in follow the `clang-something` naming convention - except
+      # for clang-$version (e.g. clang-13), which is the compiler again:
+      if [[ ! $tool =~ ^clang\-[a-zA-Z_\-]+$ ]]; then
+        continue
+      fi
+
       ln -s $out/bin/clangd $out/bin/$tool
     done
 
+    if [[ -z "$(ls -A $out/bin)" ]]; then
+      echo "Found no binaries - maybe their location or naming convention changed?"
+      exit 1
+    fi
+
+    substituteAll ${./wrapper} $out/bin/clangd
+    chmod +x $out/bin/clangd
+
     runHook postInstall
   '';