uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/editors/emacs/elisp-packages/tree-sitter-langs/update-defaults.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env nix-shell
+#! nix-shell ../../../../../../. -i python3 -p python3 -p nix
+from os.path import (
+    dirname,
+    abspath,
+    join,
+)
+from typing import (
+    List,
+    Any,
+)
+import subprocess
+import json
+import sys
+import os
+
+
+def fmt_grammar(grammar: str) -> str:
+    return "tree-sitter-" + grammar
+
+
+def eval_expr(nixpkgs: str, expr: str) -> Any:
+    p = subprocess.run(
+        [
+            "nix-instantiate",
+            "--json",
+            "--eval",
+            "--expr",
+            ("with import %s {}; %s" % (nixpkgs, expr)),
+        ],
+        check=True,
+        stdout=subprocess.PIPE,
+    )
+    return json.loads(p.stdout)
+
+
+def check_grammar_exists(nixpkgs: str, grammar: str) -> bool:
+    return eval_expr(
+        nixpkgs, f'lib.hasAttr "{fmt_grammar(grammar)}" tree-sitter-grammars'
+    )
+
+
+def build_attr(nixpkgs, attr: str) -> str:
+    return (
+        subprocess.run(
+            ["nix-build", "--no-out-link", nixpkgs, "-A", attr],
+            check=True,
+            stdout=subprocess.PIPE,
+        )
+        .stdout.decode()
+        .strip()
+    )
+
+
+if __name__ == "__main__":
+    cwd = dirname(abspath(__file__))
+    nixpkgs = abspath(join(cwd, "../../../../../.."))
+
+    src_dir = build_attr(nixpkgs, "emacs.pkgs.tree-sitter-langs.src")
+
+    existing: List[str] = []
+
+    grammars = os.listdir(join(src_dir, "repos"))
+    for g in grammars:
+        exists = check_grammar_exists(nixpkgs, g)
+        if exists:
+            existing.append(fmt_grammar(g))
+        else:
+            sys.stderr.write("Missing grammar: " + fmt_grammar(g) + "\n")
+            sys.stderr.flush()
+
+    with open(join(cwd, "default-grammars.json"), mode="w") as f:
+        json.dump(sorted(existing), f, indent=2)
+        f.write("\n")