Add helper scripts for managing appraisals

bin/install_gems_in_all_appraisals

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
+
+install-gems-for-version() {
+  local version="$1"
+  (export RBENV_VERSION=$version; bundle && bundle exec appraisal install)
+}
+
+for version in $SUPPORTED_VERSIONS; do
+  echo
+  echo "*** Installing gems for $version ***"
+  install-gems-for-version $version
+done

bin/run_all_tests

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
+
+run-tests-for-version() {
+  local version="$1"
+  (export RBENV_VERSION=$version; bundle exec rake)
+}
+
+for version in $SUPPORTED_VERSIONS; do
+  echo
+  echo "*** Running tests for $version ***"
+  run-tests-for-version $version
+done

bin/supported_ruby_versions

@@ -0,0 +1,7 @@
+#!/usr/bin/env ruby
+
+require 'yaml'
+
+travis_config_path = File.expand_path('../../.travis.yml', __FILE__)
+travis_config = YAML.load_file(travis_config_path)
+puts travis_config.fetch('rvm').join(' ')

bin/update_gem_in_all_appraisals

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
+gem="$1"
+
+update-gem-for-version() {
+  local version="$1"
+  (export RBENV_VERSION=$version; bundle update "$gem"; bundle exec appraisal update "$gem")
+}
+
+for version in $SUPPORTED_VERSIONS; do
+  echo
+  echo "*** Updating $gem for $version ***"
+  update-gem-for-version $version
+done

bin/update_gems_in_all_appraisals

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -euo pipefail
+
+SUPPORTED_VERSIONS=$(script/supported_ruby_versions)
+
+update-gems-for-version() {
+  local version="$1"
+  (export RBENV_VERSION=$version; bundle update "${@:2}"; bundle exec appraisal update "${@:2}")
+}
+
+for version in $SUPPORTED_VERSIONS; do
+  echo
+  echo "*** Updating gems for $version ***"
+  update-gems-for-version "$version" "$@"
+done