update_version.sh

#!/usr/bin/env bash
set -euo pipefail

usage() {
  echo "Usage: $0 <major|minor|patch>" >&2
}

if [[ $# -ne 1 ]]; then
  usage
  exit 1
fi

if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  echo "This script must be run inside a git repository." >&2
  exit 1
fi

bump_type="$1"
if [[ "$bump_type" != "major" && "$bump_type" != "minor" && "$bump_type" != "patch" ]]; then
  usage
  exit 1
fi

if [[ ! -f version.txt ]]; then
  echo "version.txt not found." >&2
  exit 1
fi

if [[ -n "$(git status --porcelain)" ]]; then
  echo "Working tree is not clean. Commit or stash changes before bumping version." >&2
  exit 1
fi

current_version="$(<version.txt)"
if [[ ! "$current_version" =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
  echo "version.txt must contain a semantic version like v1.2.3." >&2
  exit 1
fi

major="${BASH_REMATCH[1]}"
minor="${BASH_REMATCH[2]}"
patch="${BASH_REMATCH[3]}"

case "$bump_type" in
  major)
    major=$((major + 1))
    minor=0
    patch=0
    ;;
  minor)
    minor=$((minor + 1))
    patch=0
    ;;
  patch)
    patch=$((patch + 1))
    ;;
esac

new_version="v${major}.${minor}.${patch}"
if git rev-parse -q --verify "refs/tags/${new_version}" >/dev/null 2>&1; then
  echo "Tag ${new_version} already exists." >&2
  exit 1
fi

echo "New version: $new_version"
printf '%s\n' "$new_version" > version.txt

git add version.txt
git commit -m "Bump version to $new_version for release"
git tag "$new_version"

echo "Version updated locally. Push the branch and tag when ready:"
echo "  git push && git push origin $new_version"