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module comma {
  # Run a command if known, otherwise run it with nix
  export def , [
      cmd: string     # The command to run
      ...args: string # Command arguments; all flags MUST be quoted
    ] {
    if (not (which $cmd | is-empty)) {
      ^$cmd ...$args
      return
    }
    ^nix run $"nixpkgs#($cmd)" -- ...$args
  }
}
use comma *