bump-it.sh

#!/bin/bash
#
# Usage: bump-it.sh [major|minor|patch|nobump]
#        Default: patch
#
# This script uses the gem `bump` to do most of the heavy lifting:
# https://rubygems.org/gems/bump
#
# The updating of the Gemfile is really dump, it expects the gem to be
# specified in the following format exactly: gem 'gem-name', 'version-number'
# If that isn't specified it won't get changed.
#
# The projects are assumed to live adjacent to the current project.
# E.g.:
# /my-shared-styles
# /project1
# /project2
projects="project1 project2 project3"
gem_name="project_styles"

if-error() {
    local exit_code=$1
    local msg=${@:2}

    if [ $exit_code -ne 0 ] ; then
        echo $msg
        exit $exit_code
    fi
}

if [ $# -eq 0 ] ; then
    bump patch --tag
elif [ "$1" != "nobump" ] ; then
    bump ${$1} --tag
fi
if-error $? "Error bumping version ${1}"

rake build  # Build set to always clear out the build folder before pushing
if-error $? "Error building gem"

gem="$(pwd)/build/${gem_name}*.gem"
curren_version=$(bump current | sed 's/Current version: //')
set -x
for project in $projects ; do
    cp $gem ../$project/vendor/cache && \
        sed -i'' "s|^(gem '${gem_name}', '.*')$|gem '${gem_name}', '${current_version}'|" ../$project/Gemfile &&
        (cd ../$project && \
                bundle --local && \
                git add Gemfile* vendor/cache/${gem_name}*.gem)
    if-error $? "Error updating gem"
done