nix-config/packages/tag-release.nix

{ git, writeShellApplication }:

writeShellApplication {
  name = "tag-release";

  runtimeInputs = [ git ];

  text = ''
    commit_sha="''${1:-HEAD}"
    prefix="''${2:-}"

    tag="$(date '+%Y%m%d%R%S' | sed "s/://g")"

    test "$prefix" != "" && tag="$prefix/$tag"

    echo "Tagging commit $(git rev-parse "''${commit_sha}") as ''${tag}."
    echo ""

    git tag "''${tag}" "''${commit_sha}"
  '';
}