#!/bin/bash

# gets the current tag name or tag and revision
# plus checked out commit hash
# and writes the result into app/version.txt

BRANCH_NAME="$(git branch --show-current)"
COMMIT_HASH="$(git rev-parse --short HEAD)"
TAG_NAME="$(git describe --tags --abbrev=0)"

[[ -z "$BRANCH_NAME" ]] && APP_VERSION="${TAG_NAME}"
[[ ! -z "$BRANCH_NAME" ]] && APP_VERSION="${BRANCH_NAME}.${COMMIT_HASH}"
VERSION_FILE="version.txt"
VERSION_DIR="app"

# create directory if it does not already exist.
[[ ! -d $VERSION_DIR ]] && mkdir $VERSION_DIR

echo "$APP_VERSION" > ${VERSION_DIR}/${VERSION_FILE} &&\
echo "Updated ${VERSION_FILE} to \"${APP_VERSION}\""

exit $?