chore: import upstream snapshot with attribution

third_party/xxd/workspace.bzl

@@ -0,0 +1,12 @@
+"""xxd is a tool that converts a binary file into a C/C++ header file containing an array of bytes."""
+
+load("//third_party:repo.bzl", "tf_http_archive", "tf_mirror_urls")
+
+def repo():
+    tf_http_archive(
+        name = "xxd",
+        sha256 = "a5cdcfcfeb13dc4deddcba461d40234dbf47e61941cb7170c9ebe147357bb62d",
+        strip_prefix = "vim-9.1.0917/src/xxd",
+        urls = tf_mirror_urls("https://github.com/vim/vim/archive/refs/tags/v9.1.0917.tar.gz"),
+        build_file = "//third_party/xxd:xxd.BUILD",
+    )

third_party/xxd/xxd.BUILD

@@ -0,0 +1,30 @@
+load("@rules_cc//cc:cc_binary.bzl", "cc_binary")
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
+
+exports_files(["LICENSE"])
+
+license(
+    name = "license",
+    package_name = "vim",
+    license_kinds = [
+        "@rules_license//licenses/spdx:Vim",
+    ],
+    license_text = "LICENSE",
+    package_url = "https://github.com/vim/vim",
+)
+
+cc_binary(
+    name = "xxd",
+    srcs = [
+        "xxd.c",
+    ],
+    local_defines = select({
+        "@platforms//os:windows": ["WIN32=1"],
+        "//conditions:default": [],
+    }),
+)