gitTagPush

#!/bin/bash

#########################################################
#   Checks we are on the main branch, then adds a tag   #
#   and pushes to origin to trigger CI etc. Runs        #
#   validation against new tag to make sure correct     #
#   format and higher than last tag etc.                #
#########################################################

source ~/bash-helpers/_colours

tag=$1
msg=$2

if [ -z "$tag" ]; then
  echo "${RED}You must pass a tag as the 1st arg - this forms the git tag"
  exit 1
fi

# TODO - make optional, present a confirm there is no message prompt instead
if [ -z "$msg" ]; then
  echo "${RED}You must pass a message as the 2nd arg - this forms the git tag message"
  exit 1
fi

branchName=$(git branch | grep \* | cut -d ' ' -f2)

if [ "$branchName" != "main" ]; then
  echo "${RED}You are on not the main branch - tags should only be added to the main branch"
  exit 1
fi

# Ensure branch is up to date
git fetch

if [ $(git rev-parse HEAD) != $(git rev-parse @{u}) ]; then
  echo "${RED}Your local branch is not up to date with origin/main - please pull the latest changes"
  exit 1
fi

# Ensure tag is in the correct format
if ! [[ $tag =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
  echo "${RED}Tag must be in SemVer format, e.g. v1.2.3. You submitted: ${tag}"
  exit 1
fi

# Get the current tag from git, remove the v, split the numbers at the . and ensure new tag is higher
currentTag=$(git describe --tags --abbrev=0)
currentTagNum=$(echo $currentTag | cut -c 2-)
thisTagNum=$(echo $tag | cut -c 2-)
tagErrorMessage="New tag must be higher than the latest tag ($currentTag). You submitted: ${tag}"
currentTagSplit=(${currentTagNum//./ })
thisTagSplit=(${thisTagNum//./ })

# If major version is the same, continue to check minor version, if that's the same, check patch version
if [ "${thisTagSplit[0]}" == "${currentTagSplit[0]}" ]; then
  if [ "${thisTagSplit[1]}" == "${currentTagSplit[1]}" ]; then
    if [ "${thisTagSplit[2]}" == "${currentTagSplit[2]}" ]; then
      echo "${RED}${tagErrorMessage}"
      exit 1
    elif [ "${thisTagSplit[2]}" -lt "${currentTagSplit[2]}" ]; then
      echo "${RED}${tagErrorMessage}"
      exit 1
    fi
  elif [ "${thisTagSplit[1]}" -lt "${currentTagSplit[1]}" ]; then
    echo "${RED}${tagErrorMessage}"
    exit 1
  fi
elif [ "${thisTagSplit[0]}" -lt "${currentTagSplit[0]}" ]; then
  echo "${RED}${tagErrorMessage}"
  exit 1
fi

echo "Latest tag at origin: ${LIGHTGRAY}${currentTag}${RESTORE}"
echo "You are about to submit the tag: ${LMAGENTA}${tag}${RESTORE}"

while true; do
  read -p -r "Is this the correct tag? Pressing yes will create this tag and push it to origin which may trigger CI: (y/n) " yn
  case $yn in
  [Yy]*)
    git tag -a "$tag" -m "$msg"
    git push origin --tags
    echo "${GREEN}Success! New tag created and pushed to origin: ${LMAGENTA}${tag}${RESTORE}"
    break
    ;;
  [Nn])
    echo 'Exiting...'
    exit 1
    ;;
  *) echo "Please answer yes or no." ;;
  esac
done