Add tag.sh for easily making releases (#1649)

Add bash script for tagging commits with calver version and pushing to remote

tag.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+# bash script which tags the current commit with a calver version
+# and pushes the tag to the remote repository
+
+# Define color codes
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+if [[ $(git branch --show-current) != "master" ]]; then
+	echo -e "${RED}Please only tag commits on master branch.${NC}"
+	exit 1
+fi
+
+echo -e "${YELLOW}Checking if branch is up to date...${NC}"
+
+changed=0
+git remote update && git status -uno | grep -q 'Your branch is behind' && changed=1
+if [ $changed = 1 ]; then
+	echo -e "${RED}Please git pull before tagging.${NC}"
+	exit 1
+fi
+
+# get the current date in the format YY.MM.DD
+DATE=$(date +%y.%-m.%-d)
+
+# create plain tag with .0 at end
+TAG=$DATE.0
+
+# Ask user to confirm the commit and the tag name
+echo -e "${YELLOW}Current HEAD of master branch:${NC}"
+git log -1 --decorate
+echo
+echo -e -n "${YELLOW}Tagging current HEAD of master with tag ${TAG}. Are you sure? (y/n): ${NC}"
+read -p "" -n 1 -r
+echo
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+	echo -e "${RED}Tagging aborted.${NC}"
+	exit 1
+fi
+
+git tag $TAG
+
+echo -e -n "${YELLOW}Do you want to push the tag ${TAG} to the remote repository (which will cause a pre-release to get created)? (y/n): ${NC}"
+read -p "" -n 1 -r
+echo
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+	echo -e "${RED}Push aborted.${NC}"
+	exit 1
+fi
+
+git push origin $TAG