Improve the docs building process (discordjs#834)

* Add a script to automatically build and push docs

This script will checkout the repo in the `docs` branch, then build the
docs locally, copy it to that repo, commit and push. It is designed to
be used in conjunction with Travis.

* Add unencrypted deploy keys to the gitignore

* Make Travis automatically execute the deploy script

* Add the encrypted deploy key

* Update the .travis.yml with the necessary information

.gitignore

@@ -35,4 +35,8 @@ build/Release
 node_modules
 test/auth.json
 examples/auth.json
-docs/_build
+docs/_build
+
+# Secret keys
+docs/deploy/deploy_key
+docs/deploy/deploy_key.pub

.travis.yml

@@ -5,3 +5,9 @@ cache:
   directories:
     - node_modules
 install: npm install
+script: bash ./docs/deploy/deploy.sh
+env:
+  global:
+    - ENCRYPTION_LABEL: "be0b3b658a36"
+    - COMMIT_AUTHOR_EMAIL: "amishshah.2k@gmail.com"
+

docs/deploy/deploy.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+# Adapted from https://gist.github.com/domenic/ec8b0fc8ab45f39403dd.
+
+set -e
+
+function build {
+  node docs/generator/generator.js
+}
+
+# Ignore Travis checking PRs
+if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+  echo "deploy.sh: Ignoring PR build"
+  build
+  exit 0
+fi
+
+# Ignore travis checking other branches irrelevant to users
+if [ "$TRAVIS_BRANCH" != "master" -a "$TRAVIS_BRANCH" != "indev" ]; then
+  echo "deploy.sh: Ignoring push to another branch than master/indev"
+  build
+  exit 0
+fi
+
+SOURCE=$TRAVIS_BRANCH
+
+# Make sure tag pushes are handled
+if [ -n "$TRAVIS_TAG" ]; then
+  echo "deploy.sh: This is a tag build, proceeding accordingly"
+  SOURCE=$TRAVIS_TAG
+fi
+
+REPO=`git config remote.origin.url`
+SSH_REPO=${REPO/https:\/\/github.com\//git@github.com:}
+SHA=`git rev-parse --verify HEAD`
+
+TARGET_BRANCH="docs"
+
+# Checkout the repo in the target branch so we can build docs and push to it
+git clone $REPO out -b $TARGET_BRANCH
+cd out
+cd ..
+
+# Build the docs
+build
+
+# Move the generated JSON file to the newly-checked-out repo, to be committed
+# and pushed
+mv docs/docs.json out/$SOURCE.json
+
+# Commit and push
+cd out
+git config user.name "Travis CI"
+git config user.email "$COMMIT_AUTHOR_EMAIL"
+
+git add .
+git commit -m "Docs build: ${SHA}"
+
+ENCRYPTED_KEY_VAR="encrypted_${ENCRYPTION_LABEL}_key"
+ENCRYPTED_IV_VAR="encrypted_${ENCRYPTION_LABEL}_iv"
+ENCRYPTED_KEY=${!ENCRYPTED_KEY_VAR}
+ENCRYPTED_IV=${!ENCRYPTED_IV_VAR}
+openssl aes-256-cbc -K $ENCRYPTED_KEY -iv $ENCRYPTED_IV -in ../docs/deploy/deploy_key.enc -out deploy_key -d
+chmod 600 deploy_key
+eval `ssh-agent -s`
+ssh-add deploy_key
+
+# Now that we're all set up, we can push.
+git push $SSH_REPO $TARGET_BRANCH