dart(freeform-gradient): Update README.md

dart(freeform-gradient):
dart(freeform-gradient): clarify backup instruction if using vcs

Signed-off-by: prescientmoon <git@moonythm.dev>

2020-11-04 12:51:21 +01:00

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Hello World application with Flutter + Nix

This is a demonstration project to show usage of Flutter with Nix.

Getting Started

If you have direnv installed, run:

direnv allow

Otherwise, enter in the nix-shell:

nix-shell

After this, you can either build this project with:

flutter build apk

Or run it:

flutter run

If you have any issue, you can run flutter doctor to get a diagnostic and potential solution to fix your issues.

How to use it with your projects

Create a shell.nix file with this content:

{ pkgs ? import <nixpkgs> {} }:

let
  flutter = (import (builtins.fetchTarball
    "https://github.com/babariviere/nixpkgs/archive/flutter-init.tar.gz") {}).flutter; # this will be replaced when merged into NixOS
in pkgs.mkShell {
  buildInputs = [ flutter ];
}

After this, enter into your nix-shell and you are good to go.

Updating

To update the whole environment, do the following in order:

niv init will update nix/sources.nix if a new one is available
Make sure you have a backup of your nix/sources.json. If you're not in a git repo or use another vcs: cp nix/sources.json nix/sources.json.bak
niv update will update sources.json i.e. your version of nixpkgs used in this environment
- you may need to edit nix/android.nix if any of the attributes in there can't be found after this.
direnv reload will rebuild/reload your environment (may not be necessary if it automatically reloads)
- alternatively, run nix-shell again (?)
flutter packages update to update flutter/dart packages and get rid of the warning that you're using a different version of flutter than what was last referenced

Global install

If you want to install flutter on your system, add this to your /etc/nixos/configuration.nix:

{
  environment.systemPackages = [
    (import (builtins.fetchTarball
        "https://github.com/babariviere/nixpkgs/archive/flutter-init.tar.gz") {}).flutter
  ];
}

Have an issue ?

Create an issue on this repository with your issue and I will try to help you as much as I can !

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