Merge pull request #294455 from pedorich-n/ast-grep-completions

ast-grep: install shell completions

pkgs/by-name/as/ast-grep/package.nix

···
 , rustPlatform
 , fetchFromGitHub
 , stdenv
+, installShellFiles
 }:
 
 rustPlatform.buildRustPackage rec {
···
     NIX_LDFLAGS = "-l${stdenv.cc.libcxx.cxxabi.libName}";
   };
 
+  nativeBuildInputs = [ installShellFiles ];
+
   # error: linker `aarch64-linux-gnu-gcc` not found
   postPatch = ''
     rm .cargo/config.toml
+  '';
+
+  postInstall = ''
+    installShellCompletion --cmd sg \
+      --bash <($out/bin/sg completions bash) \
+      --fish <($out/bin/sg completions fish) \
+      --zsh <($out/bin/sg completions zsh)
   '';
 
   checkFlags = [