#!/bin/sh

set -ex

### Setup latest mdbook version ################################################

INSTALLED=$(echo $(mdbook --version 2>/dev/null || echo "mdbook none") | cut -d' ' -f1)
PINNED=0.2.1

if [ "$PINNED" != "$INSTALLED" ]; then
    URL=https://github.com/rust-lang-nursery/mdBook/releases/download/v${PINNED}/mdbook-v${PINNED}-x86_64-unknown-linux-gnu.tar.gz
    curl -SsL $URL | tar xvz -C $HOME/.cargo/bin
fi

### Build the guide ################################################################
# Build and then upload the guide to a specific folder on the gh-pages branch. This way we can have multiple versions
# of the guide at the same time (See #165)

# This builds the book in target/doc/guide. See https://github.com/rust-lang-nursery/mdBook/issues/698
mkdir -p ../target/doc
mdbook build -d ../target/doc/book

# Get the lastest tag across all branches
# https://stackoverflow.com/a/7261049/3549270
git fetch --tags
LATEST_TAG=$(git describe --tags $(git rev-list --tags --max-count=1 -l v*))

git clone -b gh-pages https://$AUTH_TOKEN@github.com/$TRAVIS_REPO_SLUG.git gh_pages
cd gh_pages

echo "<meta http-equiv=refresh content=0;url='${LATEST_TAG}/'>" > index.html

# For builds triggered by a tag, $TRAVIS_BRANCH will be set to the tag
rm -rf "$TRAVIS_BRANCH"
cp -r ../../target/doc/book "$TRAVIS_BRANCH"
git add --all
git commit -m "Upload documentation for $TRAVIS_BRANCH"

git push -f