build(nix): Add Nix Flake & Direnv-based dev shell environment

Author: PetarKirov

.direnv/.gitkeep

@@ -0,0 +1,18 @@
+# EditorConfig file: http://EditorConfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+max_line_length = 80
+
+[*.{d,h,hpp,c,cpp,cxx,cs,hs,java,kt,py,rs,sol}]
+indent_size = 4
+
+[{Makefile,go.mod,go.sum,*.go,.gitmodules}]
+indent_style = tab
+indent_size = 4

.editorconfig

@@ -0,0 +1,9 @@
+# shellcheck shell=bash
+
+if ! has nix_direnv_version || ! nix_direnv_version 2.1.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.1.1/direnvrc" "sha256-b6qJ4r34rbE23yWjMqbmu3ia2z4b2wIlZUksBke/ol0="
+fi
+
+dotenv_if_exists
+nix_direnv_watch_file shell.nix
+use flake

.envrc

@@ -0,0 +1,15 @@
+# "dotenv" environment variable files
+# Each developer can create a personal .env file with
+# local settings overrides (e.g. WEB3_URL)
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# Cached profile files created by direnv
+.direnv/*
+!.direnv/.gitkeep
+
+# Nix
+result

.gitignore

@@ -1,2 +1,3 @@
-# nix-solana-development
-A Nix flake oferring Solana development tools
+# nix-blockchain-development
+
+A Nix flake offering blockchain development tools

README.md

@@ -0,0 +1,19 @@
+{
+  description = "nix-blockchain-development";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.05";
+    flake-utils.url = github:numtide/flake-utils;
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.simpleFlake {
+      inherit self nixpkgs;
+      name = "nix-blockchain-development";
+      shell = ./shell.nix;
+    };
+}

flake.lock

@@ -0,0 +1,27 @@
+{pkgs}:
+with pkgs; let
+  nodejs = nodejs-16_x;
+  corepack = callPackage ./nix/corepack-shims {inherit nodejs;};
+in
+  mkShell {
+    buildInputs = [
+      # For priting the direnv banner
+      figlet
+
+      # For formatting Nix files
+      alejandra
+
+      # For an easy way to launch all required blockchain simulations
+      # and tailed log files
+      tmux
+      tmuxinator
+
+      # Node.js dev environment for unit tests
+      nodejs
+      corepack
+    ];
+
+    shellHook = ''
+      figlet "nix-blockchain-development"
+    '';
+  }