Additional inputs

[grahamc]

Extends convert to support more cases.

URI-types become strings:

     fenix = {
-      url = github:nix-community/fenix;
+      url = "https://flakehub.com/f/nix-community/fenix/0.1.1618.tar.gz";
       inputs.nixpkgs.follows = "nixpkgs";
     };

and IndentedStrings, such as they are, are converted too:

-     flake-utils.url = ''github:numtide/flake-utils'';
+     flake-utils.url = ''https://flakehub.com/f/numtide/flake-utils/0.1.87.tar.gz'';

and nixpkgs/release-mm.yy are supported -- migrated to releases now.

Also, while running fh across every determinatesystems project, I found another issue. When a flake.nix looks like this:

{
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

  inputs.rust-overlay.url = "github:oxalica/rust-overlay";
  inputs.rust-overlay.inputs.nixpkgs.follows = "nixpkgs";

rust-overlay's input URL appears to be replaced with "nixpkgs", causing the result to be:

{
  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.532072.tar.gz";

  inputs.rust-overlay.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.532072.tar.gz";
  inputs.rust-overlay.inputs.nixpkgs.follows = "nixpkgs";

I fixed this as well by not considering inputs.rust-overlay.inputs.nixpkgs.follows = "nixpkgs"; to be an input line.

[cole-h]

I hate that flake.nix supports indented strings.