Created flake for project

flake.nix

@@ -0,0 +1,147 @@
+{
+  description = "Javascript implementation of the Bitcoin protocol for any Bitcoin based coins";
+
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "nixpkgs/nixos-unstable"; # needed for nodePackage.terser
+
+  outputs = { self, nixpkgs }:
+
+    let
+      # Project doesnt define versions so defaulting to last commit date
+      version = "05-09-2020";
+
+      # Any system that can run a browser.
+      supportedSystems = [
+        "x86_64-linux"
+        "i686-linux"
+        "x86_64-darwin"
+        "aarch64-linux"
+        "armv6l-linux"
+        "armv7l-linux"
+        "aarch64-darwin"
+      ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = f:
+        nixpkgs.lib.genAttrs supportedSystems (system: f system);
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system:
+        import nixpkgs {
+          inherit system;
+          overlays = [ self.overlay ];
+        });
+
+    in {
+
+      overlay = final: prev: {
+        bitcoin-transactions =
+          let inherit (final) stdenv nodejs lib nodePackages;
+          in stdenv.mkDerivation {
+            name = "bitcoin-transactions-${version}";
+
+            src = self;
+
+            buildInputs = [ nodejs ];
+
+            dontBuild = true;
+
+            installPhase = ''
+              mkdir -p $out/
+              cp -r ./* $out/
+            '';
+
+            meta = {
+              homepage = "https://peersm.com/wallet";
+              description =
+                "Javascript implementation of the Bitcoin protocol for any Bitcoin based coins";
+              license = lib.licenses.mit;
+            };
+          };
+      };
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems
+        (system: { inherit (nixpkgsFor.${system}) bitcoin-transactions; });
+
+      # These apps load the package as a standalone offline webapp
+      # For these to work the XDG browser variable needs to be set to something that exists
+      # To test run `xdg-settings get default-web-browser` if this fails
+      # prepend the nix run command with your installed browser with
+      # BROWSER=<installed browser> nix run ...
+      defaultApp = forAllSystems (system:
+        let pkgs = nixpkgsFor.${system};
+        in {
+          type = "app";
+          program = "${pkgs.writeShellScript "bitcoin-transactions" ''
+            # Clear shows the Javascript unminified and readable
+            if [ "$1" == "clear" ] || [ "$1" == "c" ]; then
+              PAGE=html/walletclear.html
+            else
+              PAGE=html/wallet.html
+            fi
+            ${pkgs.xdg-utils}/bin/xdg-open ${pkgs.bitcoin-transactions}/$PAGE
+          ''}";
+        });
+
+      defaultPackage =
+        forAllSystems (system: self.packages.${system}.bitcoin-transactions);
+
+      nixosModules.bitcoin-transactions = { pkgs, lib, ... }:
+        let
+          inherit (lib) toUpper substring stringAsChars;
+          systemApp = self.defaultApp.${pkgs.system}.program;
+          defaultPackage = self.defaultPackage.${pkgs.system};
+          capitalize = str: toUpper (substring 0 1 str) + substring 1 (-1) str;
+          sanitize = str: stringAsChars (x: if x == "-" then " " else x) str;
+        in {
+          environment.systemPackages = [
+            (pkgs.makeDesktopItem {
+              name = defaultPackage.name;
+              exec = systemApp;
+              desktopName = capitalize (sanitize defaultPackage.name);
+              comment = defaultPackage.meta.description;
+              icon = "${defaultPackage.src}/desktopIcon.png";
+            })
+          ];
+        };
+
+      devShell = forAllSystems (system:
+        let inherit (nixpkgsFor.${system}) mkShell nodePackages;
+        in mkShell {
+          buildInputs = [ nodePackages.browserify nodePackages.terser ];
+          inputsFrom = builtins.attrValues self.packages.${system};
+        });
+
+      # Tests run by 'nix flake check' and by Hydra.
+      checks = forAllSystems (system: {
+        inherit (self.packages.${system}) bitcoin-transactions;
+
+        # Additional tests, if applicable.
+        test = with nixpkgsFor.${system};
+          stdenv.mkDerivation {
+            name = "bitcoin-transactions-test-${version}";
+
+            buildInputs = [ nodejs bitcoin-transactions ];
+
+            unpackPhase = "true";
+
+            buildPhase = ''
+              echo 'running some integration tests'
+              ln -s ${bitcoin-transactions}/* .
+
+              cp tests/general.js integration-tests.js
+
+              # Run all tests apart from the one that checks the network connection
+              sed -i '
+                  /^\(node\)/!d
+                  /suprnova/d' integration-tests.js
+
+              bash integration-tests.js
+            '';
+
+            installPhase = "mkdir -p $out";
+          };
+      });
+    };
+}