chore(deploy): Setup auto deployment to gh-pages (#128)

.travis.yml

@@ -1,5 +1,9 @@
 language: node_js
 cache: yarn
+env:
+  global:
+    - ENCRYPTION_LABEL "efa09eced906"
+    - COMMIT_AUTHOR_EMAIL "gh-bot@callstack.io"
 node_js:
   - 'stable'
 before_install:
@@ -12,9 +16,4 @@ install:
 script:
   - yarn run flow -- check
   - yarn run lint
-deploy:
-  provider: script
-  script: docs/deploy.sh
-  skip_cleanup: true
-  on:
-    branch: master
+  - cd docs && bash ./deploy.sh

docs/deploy.sh

@@ -1,25 +1,64 @@
 #!/bin/bash
+# Based on domenic's tutorial: https://gist.github.com/domenic/ec8b0fc8ab45f39403dd
+set -e # Exit with nonzero exit code if anything fails
 
-set -e
+SOURCE_BRANCH="master"
+TARGET_BRANCH="gh-pages"
 
-git clone https://${GITHUB_TOKEN}@github.com/callstack-io/react-native-paper.git docs/dist
+function doCompile {
+  npm run build
+}
 
-cd docs/dist
+# Pull requests and commits to other branches shouldn't try to deploy, just build to verify
+if [ "$TRAVIS_PULL_REQUEST" != "false" -o "$TRAVIS_BRANCH" != "$SOURCE_BRANCH" ]; then
+    echo "Skipping deploy; just doing a build."
+    doCompile
+    exit 0
+fi
 
-git checkout gh-pages
-rm -rf **
+# Save some useful information
+REPO=`git config remote.origin.url`
+SSH_REPO=${REPO/https:\/\/github.com\//git@github.com:}
+SHA=`git rev-parse --verify HEAD`
 
-cd .. && npm run build && cd dist
+# Clone the existing gh-pages for this repo into dist/
+# Create a new empty branch if gh-pages doesn't exist yet (should only happen on first deply)
+git clone $REPO dist
+cd dist
+git checkout $TARGET_BRANCH || git checkout --orphan $TARGET_BRANCH
+cd ..
 
-if [ -z "$(git diff --exit-code)" ]; then
+# Clean dist existing contents
+rm -rf dist/**/* || exit 0
+
+# Run our compile script
+doCompile
+
+# Now let's go have some fun with the cloned repo
+cd dist
+git config user.name "Travis CI"
+git config user.email "$COMMIT_AUTHOR_EMAIL"
+
+# If there are no changes to the compiled dist (e.g. this is a README update) then just bail.
+if git diff --quiet; then
     echo "No changes to the output on this push; exiting."
     exit 0
 fi
 
-git config user.name "Travis CI"
-git config user.email "bot@travis-ci.org"
-
+# Commit the "changes", i.e. the new version.
+# The delta will show diffs between new and old versions.
 git add -A .
-git commit -m "Deploy documentation: $(git rev-parse --verify HEAD)"
+git commit -m "Deploy to GitHub Pages: ${SHA}"
 
-git push -f -u origin gh-pages
+# Get the deploy key by using Travis's stored variables to decrypt deploy_key.enc
+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 ../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