Nurl: Generate Nix fetcher calls from repository URLs

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Nurl: Generate Nix fetcher calls from repository URLs

`nurl` is like a `nix-prefetch-git` that selects the optimal fetcher inferred from the URL, with a wide support of fetchers listed below. Here is a quick demo of how it works: $ nurl https://github.com/nix-community/patsh v0.2.0 2>/dev/null fetchFromGitHub { owner = "nix-community"; repo = "patsh"; rev = "v0.2.0"; hash = "sha256-7HXJspebluQeejKYmVA7sy/F3dtU1gc4eAbKiPexMMA="; } ### Supported Fetchers - builtins.fetchGit - fetchCrate - fetchFromBitbucket - fetchFromGitHub - fetchFromGitLab - fetchFromGitea - fetchFromGitiles - fetchFromRepoOrCz - fetchFromSourcehut - fetchHex - fetchPypi - fetchgit - fetchhg - fetchsvn ### Usage Usage: nurl [OPTIONS] [URL] [REV] Arguments: [URL] URL to the repository to be fetched [REV] The revision or reference to be fetched Options: -S, --submodules[=<SUBMODULES>] Fetch submodules instead of using the fetcher's default [possible values: true, false] -f, --fetcher <FETCHER> Specify the fetcher function instead of inferring from the URL [possible values: builtins.fetchGit, fetchCrate, fetchFromBitbucket, fetchFromGitHub, fetchFromGitLab, fetchFromGitea, fetchFromGitiles, fetchFromRepoOrCz, fetchFromSourcehut, fetchHex, fetchPypi, fetchgit, fetchhg, fetchsvn] -F, --fallback <FALLBACK> The fetcher to fall back to when nurl fails to infer it from the URL [default: fetchgit] [possible values: builtins.fetchGit, fetchCrate, fetchFromBitbucket, fetchFromGitHub, fetchFromGitLab, fetchFromGitea, fetchFromGitiles, fetchFromRepoOrCz, fetchFromSourcehut, fetchHex, fetchPypi, fetchgit, fetchhg, fetchsvn] -n, --nixpkgs <NIXPKGS> Path to nixpkgs (in nix) [default: <nixpkgs>] -i, --indent <INDENT> Extra indentation (in number of spaces) [default: 0] -H, --hash Only output the hash -j, --json Output in json format -p, --parse Parse the url without fetching the hash, output in json format -a, --arg <NAME> <EXPR> Additional arguments to pass to the fetcher -A, --arg-str <NAME> <STRING> Same as --arg, but accepts strings instead Nix expressions -o, --overwrite <NAME> <EXPR> Overwrite arguments in the final output, not taken into consideration when fetching the hash -O, --overwrite-str <NAME> <STRING> Same as --overwrite, but accepts strings instead Nix expressions -l, --list-fetchers List all available fetchers -L, --list-possible-fetchers List all fetchers that can be generated without --fetcher -s, --list-sep <SEPARATOR> Print out the listed fetchers with the specified separator, only used when --list-fetchers or --list-possible-fetchers is specified -h, --help Print help -V, --version Print version