Bash script to bump the version

bump-version.sh

#!/bin/bash

# Works with a file called VERSION in the current directory,
# the contents of which should be a semantic version number
# such as "1.2.3"

# this script will display the current version, automatically
# suggest a "minor" version update, and ask for input to use
# the suggestion, or use a newly entered value.

set -e

source bin/utils.sh

suggest_version() {
  local CURRENT_VERSION
  local CURRENT_MAJOR
  local CURRENT_MINOR

  CURRENT_VERSION=$(cat VERSION)
  CURRENT_MAJOR=$(echo "$CURRENT_VERSION" | cut -d. -f1)
  CURRENT_MINOR=$(echo "$CURRENT_VERSION" | cut -d. -f2)

  SUGGESTED_MINOR=$((CURRENT_MINOR + 1))
  SUGGESTED_PATCH=0

  echo "$CURRENT_MAJOR.$SUGGESTED_MINOR.$SUGGESTED_PATCH"
}

update_version() {
  NEW_VERSION=$1; shift
  
  echo "$NEW_VERSION" > VERSION
  git add VERSION
}

push_tags() {
  NEW_VERSION=$1; shift

  echo "Pushing new version to the origin"
  git commit -m "Bump version to ${NEW_VERSION}."
  git tag -a -m "Tag version ${NEW_VERSION}." "v$NEW_VERSION"
  git push origin --tags
}

exit_if_dirty

if [ -f VERSION ]; then
  SUGGESTED_VERSION=$(suggest_version)

  echo_notice "Current version: ${WHITE}$(cat VERSION)"
  NEW_VERSION=$(echo_prompt "Enter a version number" "[$SUGGESTED_VERSION]")

  if [ "$NEW_VERSION" = "" ]; then NEW_VERSION=$SUGGESTED_VERSION; fi
  echo "Will set new version to be $NEW_VERSION"
  update_version "$NEW_VERSION"
  push_tags "$NEW_VERSION"
else
  echo_warning "Could not find a ${WHITE}VERSION${YELLOW} file."
  RESPONSE=$(echo_prompt "Do you want to create a version file and start from scratch?" "(y/n)")

  case "$RESPONSE" in
    y|Y ) update_version "0.1.0" && push_tags "0.1.0";;
    * ) exit 1;;
  esac
fi


# Rails usage example:
## # config/application.rb
## module MyApp
##  class Application < Rails::Application
##    VERSION = File.read('VERSION').strip
##    # ...
##  end
## end
#
#
# Elixir usage example
## # mix.exs
## defmodule MyApp.MixProject do
##   def project do
##     [
##       app: :my_app,
##       version: File.read!("VERSION") |> String.trim(),
##       # ...
##     ]
##   end
## end

utils.sh

#!/bin/bash

GREEN="\033[0;32m"
YELLOW="\033[1;33m"
CYAN="\033[1;36m"
WHITE="\033[1;37m"
RESET="\033[0m"

QUESTION_FLAG="${GREEN}?${RESET}"
WARNING_FLAG="${YELLOW}!${RESET}"
NOTICE_FLAG="${CYAN}❯${RESET}"

echo_notice() {
  echo -e "$NOTICE_FLAG $CYAN $1$RESET"
}

echo_prompt() {
  local PROMPT
  local HINT
  PROMPT=$1; shift
  HINT=$1; shift
  echo -ne "$QUESTION_FLAG $CYAN $PROMPT $WHITE$HINT$CYAN: $WHITE" > /dev/stderr
  read -r CHOICE
  echo "$CHOICE"
  echo_reset > /dev/stderr
}

echo_warning() {
  echo -e "$WARNING_FLAG $YELLOW $1$RESET"
}

echo_reset() {
  echo -en "$RESET"
}

exit_if_dirty() {
  if [[ $(git diff --stat) != '' ]]; then
    echo_warning "You have uncommitted changes. Please resolve your changes first."
    exit 1
  fi
}