sync-translation

#!/bin/sh
#
# Sync changes from upstream and open a pull request
#
#   Usage: script/sync-upstream [remote]
#
# TODO:
# - [ ] handle merge conflicts with `git merge --continue`

set -e

which -s hub || (echo "This script requires the 'hub' command: http://hub.github.com/" && exit 1)

# If there's not an upstream remote, set it.
if ! git remote show | grep -q upstream; then
  git remote add upstream https://github.com/github/opensource.guide.git
fi

REMOTE=${1:-"origin"}
BASE="$REMOTE/gh-pages"
HEAD="upstream/gh-pages"

git fetch upstream
git fetch $REMOTE

BASE_SHA=$(git rev-parse $BASE)
HEAD_SHA=$(git rev-parse $HEAD)
BRANCH="sync-${HEAD_SHA:0:8}"

TRANSLATABLE_FILES="
  _articles
  _data/locale/en-US.yml
  _config
"

## Create a new branch and merge in the changes from upstream.
echo "Creating branch $BRANCH based off $BASE"
git checkout -B $BRANCH $BASE
echo "Merging in latest changes from $HEAD"
git merge -q --no-edit $HEAD
git push $REMOTE $BRANCH

CHANGED_FILES=$(git diff --name-only $BASE_SHA $HEAD_SHA -- $TRANSLATABLE_FILES)

TEMPLATE="Sync changes from upstream\n\n"

if [ -z "$CHANGED_FILES" ]; then
  TEMPLATE="$TEMPLATE\nNo files that need translation were changed upstream."
else
  TEMPLATE="$TEMPLATE\nCheck the changes in each of these files and update the translation accordingly:\n"

  for file in $CHANGED_FILES; do
    TEMPLATE="$TEMPLATE\n- [ ] \`$file\`"
  done
fi

OWNER=$(git config --get remote.$REMOTE.url | sed -Ene 's#.*github.com[/:]([^/]*)/.*#\1#p')

echo $TEMPLATE | hub pull-request -o -F - -b $OWNER:gh-pages -h $OWNER:$BRANCH