Adds an action for setting up brew and installing from brewfile (#8)

.github/actions/test-setup-homebrew/action.yml

@@ -0,0 +1,37 @@
+---
+
+name: 'Test setup-homebrew'
+description: 'Runs validation against the setup-homebrew action'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: 'Install BATS'
+      shell: bash
+      run: |
+        if [ "$RUNNER_OS" == Linux ]; then
+          # Add brews to the path
+          echo "/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin" >> $GITHUB_PATH
+          # Setup brew environment
+          eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+        fi
+        # Install bats
+        brew install bats-core
+
+    - name: 'Checkout actions'
+      uses: actions/checkout@v2
+
+    - name: 'Create a Brewfile'
+      shell: bash
+      run: |
+        {
+          echo "brew 'tflint'"
+          echo "brew 'the_silver_searcher'"
+        } > Brewfile
+
+    - name: 'Run setup-brew action'
+      uses: ./actions/setup-homebrew
+
+    - name: 'Validate'
+      shell: bash
+      run: bats -r ${{ github.action_path }}/setup-homebrew.bats

.github/actions/test-setup-homebrew/setup-homebrew.bats

@@ -0,0 +1,19 @@
+#!/usr/bin/env bats
+
+@test "it should have brew installed" {
+  run brew --version
+
+  [ "$status" -eq 0 ]
+}
+
+@test "it should have installed tflint" {
+  run tflint --version
+
+  [ "$status" -eq 0 ]
+}
+
+@test "it should have installed ag" {
+  run ag --version
+
+  [ "$status" -eq 0 ]
+}

.github/workflows/test-setup-homebrew.yml

@@ -0,0 +1,26 @@
+---
+
+name: 'Run setup-homebrew action'
+
+on:
+  pull_request:
+    paths:
+      - actions/setup-homebrew/*
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  test-setup-homebrew-action:
+    name: 'Uses the setup-homebrew action'
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: 'Checkout actions'
+        uses: actions/checkout@v2
+
+      - name: 'Test setup-brew action'
+        uses: ./.github/actions/test-setup-homebrew

actions/setup-homebrew/action.yml

@@ -0,0 +1,56 @@
+---
+
+name: 'Setup Homebrew'
+description: 'Sets up Homebrew and installs dependencies from a Brewfile'
+
+inputs:
+  install:
+    description: 'Setting to false will not install the brew dependencies from the Brewfile.  If the brewfile cannot be found, this boolean is disregarded in the first place.'
+    type: boolean
+    default: true
+  brewfile:
+    description: 'The Brewfile to install dependencies from.'
+    type: string
+    default: 'Brewfile'
+  cache:
+    description: 'Indicates whether to setup caching for  brew dependencies'
+    type: boolean
+    default: true
+  working-directory:
+    description: 'The directory to run the setup within'
+    default: '.'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: 'Determine Homebrew paths and conditionals'
+      id: info
+      shell: bash
+      working-directory: ${{ inputs.working-directory }}
+      run: ${{ github.action_path }}/brew-info.sh ${{ inputs.brewfile }} ${{ inputs.install }}
+
+    - name: 'Configure Homebrew cache'
+      if: inputs.cache == 'true'
+      uses: actions/cache@v2
+      with:
+        path: |
+          ${{ steps.info.outputs.cache-path }}/*--*
+          ${{ steps.info.outputs.cache-path }}/downloads/*
+        key: brew-${{ hashFiles('Brewfile') }}
+        restore-keys: brew-
+
+    - name: 'Add brew path'
+      shell: bash
+      run: echo "${{ steps.info.outputs.bin-paths }}" >> $GITHUB_PATH
+
+    - name: 'Install from brewfile'
+      if: steps.info.outputs.should-install == 'true'
+      shell: bash
+      working-directory: ${{ inputs.working-directory }}
+      env:
+        PREFIX_PATH: ${{ steps.info.outputs.prefix_path }}
+      run: |
+        if [ "$RUNNER_OS" = Linux ]; then
+          eval "$($PREFIX_PATH/bin/brew shellenv)"
+        fi
+        brew bundle install --file=${{ inputs.brewfile }}

actions/setup-homebrew/brew-info.bats

@@ -0,0 +1,69 @@
+#!/usr/bin/env bats
+
+load brew-info.sh
+
+function setup() {
+  pushd "$BATS_TEST_TMPDIR" >/dev/null
+}
+
+function teardown() {
+  popd >/dev/null
+}
+
+@test "it should not indicate to install if the install variable is false" {
+  touch Brewfile
+
+  run brew-info Brewfile false
+
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ .*"::set-output name=should-install::false".* ]]
+}
+
+@test "it should not indicate to install if the file does not exist" {
+  run brew-info Brewfile true
+
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ .*"::set-output name=should-install::false".* ]]
+}
+
+@test "it should indicate to install if the file does exist and the install variable is true" {
+  touch Brewfile
+
+  run brew-info Brewfile true
+
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ .*"::set-output name=should-install::true".* ]]
+}
+
+@test "it should output the cache path for homebrew" {
+  # Dynamically pull the cache path because it will run on multiple OS
+  local cache_path=''
+  cache_path="$(brew --cache)"
+
+  run brew-info Brewfile true
+
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ .*"::set-output name=cache-path::${cache_path}".* ]]
+}
+
+@test "it should output the prefix path for homebrew" {
+  # Dynamically pull the prefix path because it will run on multiple OS
+  local prefix_path=''
+  prefix_path="$(brew --prefix)"
+
+  run brew-info Brewfile true
+
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ .*"::set-output name=prefix-path::${prefix_path}".* ]]
+}
+
+@test "it should output the bin paths for homebrew" {
+  # Dynamically pull the bin path because it will run on multiple OS
+  local prefix_path=''
+  prefix_path="$(brew --prefix)"
+
+  run brew-info Brewfile true
+
+  [ "$status" -eq 0 ]
+  [[ "$output" =~ .*"::set-output name=bin-paths::${prefix_path}/bin:${prefix_path}/sbin".* ]]
+}

actions/setup-homebrew/brew-info.sh

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+#!/usr/bin/env bash
+
+function brew-info() {
+  set -eo pipefail
+
+  local brewfile="${1:-Brewfile}"
+  local install="${2:-true}"
+
+  local should_install=false
+  if [ "$install" = true ] && [ -f "$brewfile" ]; then
+    should_install=true
+  fi
+  echo "::set-output name=should-install::${should_install}"
+
+  local cache_path=''
+  cache_path="$(brew --cache)"
+  echo "::set-output name=cache-path::${cache_path}"
+
+  local prefix_path=''
+  prefix_path="$(brew --prefix)"
+  echo "::set-output name=prefix-path::${prefix_path}"
+  echo "::set-output name=bin-paths::${prefix_path}/bin:${prefix_path}/sbin"
+}
+
+if [ "${BASH_SOURCE[0]}" = "$0" ]; then
+  set -u
+
+  brew-info "${@:-}"
+  exit $?
+fi