release

#!/bin/bash

DIR="$(dirname "$0")"

if [ -n "$(echo "v$1" | sed -e 's/v[0-9]\+\.[0-9]\+\.[0-9]\+//')" ]; then
  echo "Usage: $0 VERSION, where VERSION is like '1.0.0'" >&2
  exit 1
fi

if (cd "$DIR" && git status --short | grep -E '.'); then
  echo "You have unsaved changes. Please git commit or reset them and run this again." >&2
  exit 1
fi

PATCH_VERSION="$1"
MINOR_VERSION="${PATCH_VERSION%.*}"
MAJOR_VERSION="${MINOR_VERSION%.*}"

version_too_small() {
  echo "Cannot release v${PATCH_VERSION} because the latest release on this branch is already ${OLD_PATCH_VERSION}." >&2
  exit 1
}

OLD_PATCH_VERSION=$(cat "$DIR"/VERSION)
MAJOR_VERSION_INT=$(echo $PATCH_VERSION | cut -d. -f1)
MINOR_VERSION_INT=$(echo $PATCH_VERSION | cut -d. -f2)
PATCH_VERSION_INT=$(echo $PATCH_VERSION | cut -d. -f3)
OLD_MAJOR_VERSION_INT=$(echo $OLD_PATCH_VERSION | cut -d. -f1)
OLD_MINOR_VERSION_INT=$(echo $OLD_PATCH_VERSION | cut -d. -f2)
OLD_PATCH_VERSION_INT=$(echo $OLD_PATCH_VERSION | cut -d. -f3)
if [ $MAJOR_VERSION_INT -lt $OLD_MAJOR_VERSION_INT ]; then version_too_small; fi
if [ $MAJOR_VERSION_INT -eq $OLD_MAJOR_VERSION_INT ] && [ $MINOR_VERSION_INT -lt $OLD_MINOR_VERSION_INT ]; then version_too_small; fi
# Let user re-release the current version, in case something went wrong last release
if [ $MAJOR_VERSION_INT -eq $OLD_MAJOR_VERSION_INT ] && [ $MINOR_VERSION_INT -eq $OLD_MINOR_VERSION_INT ] && [ $PATCH_VERSION_INT -lt $OLD_PATCH_VERSION_INT ]; then version_too_small; fi

(cd "$DIR" \
  && docker build . \
  && echo "$PATCH_VERSION" > VERSION \
  && (git diff --quiet || git commit -m "v$PATCH_VERSION" VERSION) \
  && git push \
  && git tag "v$PATCH_VERSION" \
  && git push origin "v$PATCH_VERSION"
)