feat: Add ability to generate config files

Author: bibendi

README.md

@@ -80,7 +80,24 @@ dip --help
 dip SUBCOMMAND --help
 ```
 
-### dip.yml
+### dip generate
+
+If your project has a typical schema, dip can generate all necessary config files with a single command.
+Available generators you can find at [here](lib/dip/generators)
+
+```sh
+dip generate ruby/gem --ruby 2.6 --bundler 2.0.2 --postgres 11.4
+
+dip generate ruby/rails --ruby 2.6 --bundler 2.0.2 --node 11 --yarn 1.13.0 --postgres 11.4 --redis 4 --webpacker --selenium 
+``` 
+
+You can omit any of above options. To list all available generator's options: 
+
+```sh
+dip generate [STACK] --help
+```
+
+### dip file reference
 
 The configuration file `dip.yml` should be placed in a project root directory.
 Also, in some cases, you may want to change the default config path by providing an environment variable `DIP_FILE`.

lib/dip/cli.rb

@@ -78,6 +78,14 @@ def provision
       end
     end
 
+    desc "generate STACK [OPTIONS]", "Generate config files for a given stack"
+    def generate(stack, *argv)
+      # TODO: Add ability to download stack from any github repository.
+      require_relative "generators/#{stack}/generator.rb"
+
+      Dip::Generator.start(argv)
+    end
+
     require_relative 'cli/ssh'
     desc "ssh", "ssh-agent container commands"
     subcommand :ssh, Dip::CLI::SSH

lib/dip/generators/ruby/gem/generator.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Dip
+  class Generator < Thor::Group
+    include Thor::Actions
+
+    class_option :ruby, default: "latest"
+    class_option :postgres, default: false
+    class_option :appraisal, default: false
+
+    def self.source_root
+      File.join(__dir__, "templates")
+    end
+
+    def create_docker_compose_config
+      template("docker-compose.yml.tt", File.join("tmp", "docker-compose.yml"))
+    end
+
+    def create_dip_config
+      template("dip.yml.tt", File.join("tmp", "dip.yml"))
+    end
+  end
+end

lib/dip/generators/ruby/gem/templates/dip.yml.tt

@@ -0,0 +1,49 @@
+version: '2'
+
+environment:
+  BUNDLE_GEMFILE: /app/Gemfile
+
+compose:
+  files:
+    - docker-compose.yml
+
+interaction:
+  app:
+    service: app
+    subcommands:
+      bash:
+        command: /usr/bin/bash
+      console:
+        command: ./bin/console
+      clean:
+        command: rm -rf Gemfile.lock<%= " gemfiles/*.gemfile.*" if options["appraisal"] %>
+
+  bundle:
+    service: app
+    command: bundle
+
+  <%- if options["appraisal"] -%>
+  appraisal:
+    service: app
+    command: bundle exec appraisal
+
+  <%- end -%>
+  rspec:
+    service: app
+    <%- if options["appraisal"] -%>
+    command: bundle exec appraisal bundle exec rspec
+    <%- else -%>
+    command: bundle exec rspec
+    <%- end -%>
+
+  rubocop:
+    service: app
+    command: bundle exec rubocop
+    compose_run_options: [no-deps]
+
+provision:
+  - dip app clean
+  - dip bundle install
+  <%- if options["appraisal"] -%>
+  - dip appraisal install
+  <%- end -%>

lib/dip/generators/ruby/gem/templates/docker-compose.yml.tt

@@ -0,0 +1,34 @@
+version: '3.4'
+
+services:
+  app:
+    image: ruby:<%= options["ruby"] %>
+    environment:
+      BUNDLE_PATH: /bundle
+      BUNDLE_CONFIG: /app/.bundle/config
+      <%- if options["postgres"] -%>
+      DB_HOST: db
+      DB_NAME: docker
+      DB_USERNAME: postgres
+      <%- end -%>
+    command: bash
+    working_dir: /app
+    volumes:
+      - .:/app:cached
+      - bundler_data:/bundle
+    tmpfs:
+      - /tmp
+    <%- if options["postgres"] -%>
+    depends_on:
+      - db
+    <%- end -%>
+
+  <%- if options["postgres"] -%>
+  db:
+    image: postgres:<%= options["postgres"] %>
+    environment:
+      - POSTGRES_DB=docker
+
+  <%- end -%>
+volumes:
+  bundler_data: