Add Autoprefixer on Bootstrap installation (#119)

Author: javierav

lib/install/bootstrap/install.rb

@@ -1,7 +1,7 @@
-say "Install Bootstrap with Bootstrap Icons and Popperjs/core"
+say "Install Bootstrap with Bootstrap Icons, Popperjs/core and Autoprefixer"
 copy_file "#{__dir__}/application.bootstrap.scss",
    "app/assets/stylesheets/application.bootstrap.scss"
-run "yarn add sass bootstrap bootstrap-icons @popperjs/core"
+run "yarn add sass bootstrap bootstrap-icons @popperjs/core postcss postcss-cli autoprefixer nodemon"
 
 inject_into_file "config/initializers/assets.rb", after: /.*Rails.application.config.assets.paths.*\n/ do
   <<~RUBY
@@ -16,16 +16,32 @@
   say %(Add import * as bootstrap from "bootstrap" to your entry point JavaScript file), :red
 end
 
-say "Add build:css script"
-build_script = "sass ./app/assets/stylesheets/application.bootstrap.scss:./app/assets/builds/application.css --no-source-map --load-path=node_modules"
+def add_npm_script(name, script, run_script=true)
+  case `npx -v`.to_f
+  when 7.1...8.0
+    say "Add #{name} script"
+    run %(npm set-script #{name} "#{script}")
+    run %(yarn #{name}) if run_script
+  when (8.0..)
+    say "Add #{name} script"
+    run %(npm pkg set scripts.#{name}="#{script}")
+    run %(yarn #{name}) if run_script
+  else
+    say %(Add "scripts": { "#{name}": "#{script}" } to your package.json), :green
+  end
+end
+
+add_npm_script("build:css:compile", "sass ./app/assets/stylesheets/application.bootstrap.scss:./app/assets/builds/application.css --no-source-map --load-path=node_modules")
+add_npm_script("build:css:prefix", "postcss ./app/assets/builds/application.css --use=autoprefixer --output=./app/assets/builds/application.css")
+add_npm_script("build:css", "yarn build:css:compile && yarn build:css:prefix")
+add_npm_script("watch:css", "nodemon --watch ./app/assets/stylesheets/ --ext scss --exec \\\"yarn build:css\\\"", false)
+
+gsub_file "Procfile.dev", "build:css --watch", "watch:css"
 
 case `npx -v`.to_f
-when 7.1...8.0
-  run %(npm set-script build:css "#{build_script}")
-  run %(yarn build:css)
-when (8.0..)
-  run %(npm pkg set scripts.build:css="#{build_script}")
-  run %(yarn build:css)
+when (7.1..)
+  say "Add browserslist config"
+  run %(npm pkg set browserslist[]=defaults)
 else
-  say %(Add "scripts": { "build:css": "#{build_script}" } to your package.json), :green
+  say %(Add "browserslist": ["defaults"] to your package.json), :green
 end