Rakefile

# This is to simplfy app development
# Note: guard-process does not work reliably on newer bundler and the autoreload in shiny is very fast so
# using that and just helping with the guard to touch app.R for a full reload of the app sources
# Installation:
#  - check for Ruby: ruby --version
#  - install Bundler: gem install bundler
#  - install Gems: bundle install

# How to use:
#  - start 2 terminals
#  - terminal 1: rake dev
#  - terminal 2: rake guard

desc "run the shiny app in development mode"
task :dev do
    puts "*** REMEMBER to start `rake guard` in a separate terminal for auto-reload"
    cmd = "rm(list = ls()); Sys.setenv('LOG_LEVEL' = 'DEBUG'); shiny::devmode(TRUE); options(shiny.autoreload.pattern = 'app.R'); shiny::runApp('app.R', port = 4444)"
    sh "R -e \"#{cmd}\""
end

desc "watch for source changes to trigger shiny's auto-reload"
task :guard do
    sh "bundle exec guard"
end