Split the publish script into multiple scripts so they don't step on each other. (tensorflow#250)

Currently if you run ./scripts/publish-npm.sh the first publish needs an OTP and for the scripts after don't wait so they step on each other and put the repo in a bad state and I have to manually call npm publish.

This makes you now have to run the scripts separately:
```
./scripts/publish-npm.sh
./scripts/publish-npm-gpu.sh
```

Hopefully in the future we can merge the packages (letting the user specify when installing which binary they want).

I have *not* tested this script (I will do it during the next release and modify it and re-check it in).

Author: Nikhil Thorat

package.json

@@ -14,6 +14,7 @@
   "scripts": {
     "build": "tsc",
     "build-npm": "./scripts/build-npm.sh",
+    "build-npm-gpu": "./scripts/build-npm-gpu.sh",
     "clean-deps": "rm -rf deps",
     "coverage": "nyc ts-node src/run_tests.ts",
     "enable-gpu": "node scripts/install.js gpu download && yarn",

scripts/build-npm-gpu.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# Copyright 2018 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+set -e
+
+# The binding builds with a symlink by default, for NPM packages change the
+# download option to move libtensorflow next to the prebuilt binary.
+sed -i -e 's/symlink/move/' binding.gyp
+
+# Build GPU:
+sed -i -e 's/tfjs-node"/tfjs-node-gpu"/' package.json
+sed -i -e 's/install.js"/install.js gpu download"/' package.json
+rimraf deps/
+rimraf dist/
+yarn
+yarn prep
+tsc --sourceMap false
+# This produces a tarball that will later be used by `npm publish`.
+npm pack
+
+# Revert GPU changes:
+git checkout .

scripts/build-npm.sh

@@ -25,17 +25,5 @@ rimraf dist/
 yarn
 yarn prep
 tsc --sourceMap false
+# This produces a tarball that will later be used by `npm publish`.
 npm pack
-
-# Build GPU:
-sed -i -e 's/tfjs-node"/tfjs-node-gpu"/' package.json
-sed -i -e 's/install.js"/install.js gpu download"/' package.json
-rimraf deps/
-rimraf dist/
-yarn
-yarn prep
-tsc --sourceMap false
-npm pack
-
-# Revert GPU changes:
-git checkout .

scripts/publish-npm-gpu.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+# Copyright 2017 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+# Before you run this script, do this:
+# 1) Update the version in package.json
+# 2) Run ./scripts/make-version from the base dir of the project.
+# 3) Run `yarn` to update `yarn.lock`, in case you updated dependencies
+# 4) Commit to the master branch.
+
+# Then:
+# 5) Checkout the master branch of this repo.
+# 6) Run this script as `./scripts/publish-npm-gpu.sh` from the project base dir.
+
+set -e
+
+BRANCH=`git rev-parse --abbrev-ref HEAD`
+ORIGIN=`git config --get remote.origin.url`
+
+if [ "$BRANCH" != "master" ] && [ "$BRANCH" != "0.3.x" ]; then
+  echo "Error: Switch to the master or a release branch before publishing."
+  exit
+fi
+
+if ! [[ "$ORIGIN" =~ tensorflow/tfjs-node ]]; then
+  echo "Error: Switch to the main repo (tensorflow/tfjs-node) before publishing."
+  exit
+fi
+
+./scripts/make-version # This is for safety in case you forgot to do 2).
+
+GPU_TARBALLS=$(ls tensorflow-tfjs-node-gpu*.tgz)
+GPU_TARBALL_COUNT=$(echo $GPU_TARBALLS | wc -w | xargs)
+if [ "$GPU_TARBALL_COUNT" != "1" ]; then
+  echo "Error: Please make sure there is exactly one GPU tarball, found:"
+  echo $GPU_TARBALLS
+  exit
+fi
+
+yarn build-npm-gpu
+# Publish the GPU package
+echo $GPU_TARBALLS | xargs npm publish
+./scripts/tag-version
+echo 'Yay! Published the tfjs-node-gpu package to npm.'

scripts/publish-npm.sh

@@ -14,6 +14,11 @@
 # limitations under the License.
 # =============================================================================
 
+################################################################################
+# NOTE: This does *not* publish the GPU package. Please run
+# ./scripts/publish-npm-gpu.sh separately to publish the GPU package.
+################################################################################
+
 # Before you run this script, do this:
 # 1) Update the version in package.json
 # 2) Run ./scripts/make-version from the base dir of the project.
@@ -42,17 +47,12 @@ fi
 yarn build-npm
 ./scripts/make-version # This is for safety in case you forgot to do 2).
 
-GPU_TARBALLS=$(ls tensorflow-tfjs-node-gpu*.tgz)
-GPU_TARBALL_COUNT=$(echo $GPU_TARBALLS | wc -w | xargs)
-if [ "$GPU_TARBALL_COUNT" != "1" ]; then
-  echo "Error: Please make sure there is exactly one GPU tarball, found:"
-  echo $GPU_TARBALLS
-  exit
-fi
-
 # Publish the CPU package
 npm publish
-# Publish the GPU package
-echo $GPU_TARBALLS | xargs npm publish
 ./scripts/tag-version
-echo 'Yay! Published a new package to npm.'
+echo 'Yay! Published the tfjs-node package to npm.'
+
+echo '#########################################################################'
+echo '# NOTE: This does *not* publish the GPU package. Please run'
+echo '# ./scripts/publish-npm-gpu.sh separately to publish the GPU package.'
+echo '#########################################################################'