Adds support for org names in package.json (#52)

* Adds support for org names in package.json

This commit adds a function to reformat the string in the name field of
a package.json into a format that nix can use as a derivation name. This
is done through a combination of nix builtins that may not be ideal.

This is necessary because the organization in npm scoping is incompatible with
the format for nix package names.

* Adds organization name-spacing test

default.nix

@@ -12,6 +12,17 @@ in rec {
   unlessNull = item: alt:
     if item == null then alt else item;
 
+  reformatPackageName = pname:
+    let
+      # regex adapted from `validate-npm-package-name`
+      # will produce 3 parts e.g.
+      # "@someorg/somepackage" -> [ "@someorg/" "someorg" "somepackage" ]
+      # "somepackage" -> [ null null "somepackage" ]
+      parts = builtins.tail (builtins.match "^(@([^\/]+?)[\/])?([^\/]+?)$" pname);
+      # if there is no organisation we need to filter out null values.
+      non-null = builtins.filter (x: x != null) parts;
+    in builtins.concatStringsSep "-" non-null;
+
   # Generates the yarn.nix from the yarn.lock file
   mkYarnNix = yarnLock:
     pkgs.runCommand "yarn.nix" {}
@@ -115,7 +126,7 @@ in rec {
   }@attrs:
     let
       package = lib.importJSON packageJSON;
-      pname = package.name;
+      pname = reformatPackageName package.name;
       version = package.version;
       deps = mkYarnModules {
         name = "${pname}-modules-${version}";

tests/default.nix

@@ -7,4 +7,4 @@ let
     value = yarn2nix.mkYarnPackage { src = ./. + "/${name}"; };
   };
 in
-listToAttrs (build ["wetty" "weave-front-end"])
+listToAttrs (build ["wetty" "weave-front-end" "sendgrid-helpers"])

tests/sendgrid-helpers/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@sendgrid/helpers",
+  "description": "SendGrid NodeJS internal helpers",
+  "version": "6.2.1",
+  "author": "SendGrid <dx@sendgrid.com> (sendgrid.com)",
+  "contributors": [
+    "Kyle Partridge <kyle.partridge@sendgrid.com>",
+    "David Tomberlin <david.tomberlin@sendgrid.com>",
+    "Swift <swift@sendgrid.com>",
+    "Brandon West <brandon.west@sendgrid.com>",
+    "Scott Motte <scott.motte@sendgrid.com>",
+    "Robert Acosta <robert.acosta@sendgrid.com>",
+    "Elmer Thomas <elmer.thomas@sendgrid.com>",
+    "Adam Reis <adam@reis.nz>"
+  ],
+  "license": "MIT",
+  "homepage": "https://sendgrid.com",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/sendgrid/sendgrid-nodejs.git"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "engines": {
+    "node": ">= 6.0.0"
+  },
+  "tags": [
+    "sendgrid",
+    "helpers"
+  ],
+  "dependencies": {
+    "chalk": "^2.0.1"
+  }
+}

tests/sendgrid-helpers/yarn.lock

@@ -0,0 +1,41 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+ansi-styles@^3.1.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.0.tgz#c159b8d5be0f9e5a6f346dab94f16ce022161b88"
+  dependencies:
+    color-convert "^1.9.0"
+
+chalk@^2.0.1:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.3.0.tgz#b5ea48efc9c1793dccc9b4767c93914d3f2d52ba"
+  dependencies:
+    ansi-styles "^3.1.0"
+    escape-string-regexp "^1.0.5"
+    supports-color "^4.0.0"
+
+color-convert@^1.9.0:
+  version "1.9.1"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.1.tgz#c1261107aeb2f294ebffec9ed9ecad529a6097ed"
+  dependencies:
+    color-name "^1.1.1"
+
+color-name@^1.1.1:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
+
+escape-string-regexp@^1.0.5:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
+
+has-flag@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-2.0.0.tgz#e8207af1cc7b30d446cc70b734b5e8be18f88d51"
+
+supports-color@^4.0.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-4.5.0.tgz#be7a0de484dec5c5cddf8b3d59125044912f635b"
+  dependencies:
+    has-flag "^2.0.0"