Fastfile

# Logging examples:
# => fastlane too_loud
# => fastlane too_quiet
# => fastlane too_quiet --troubleshoot
# => fastlane just_right
# => fastlane ui_colors
# => fastlane ui_colors --verbose

shell_command = "ls -l"

lane :too_loud do
  list_files
end

lane :too_quiet do
  UI.important "Running a shell script"
  sh(shell_command, log: false) # suppress command printing and command output
  sh("exit 65", log: false) do UI.verbose "Something went horribly wrong" end  # suppress command printing and command output and ignore failure
end

lane :just_right do
  UI.important "Running a shell script"
  sh shell_command
  sh "exit 65" do UI.user_error! "Something went horribly wrong" end # properly exit on failure with nice-ish message 
end

private_lane :list_files do
  # notice that we "cruise" over to this lane creating extra headers
  # notice the extra entry in the summary table as well
  UI.important "Running a shell script"
  sh shell_command

  # notice the long entry in headers, and truncation in summary table
  sh "echo 'some really really long string, or series of commands' | grep really && exit 65" do true end  # ignore failure

end

lane :ui_colors do
  interface_methods = FastlaneCore::Interface.instance_methods - Object.instance_methods
  UI.command_output "All Available UI methods: #{interface_methods}"

  UI.message "Plain old black."
  UI.important "Yellow so you can see it."
  UI.error "Red, but keep running."
  UI.verbose "Shown only when --verbose is passed."

  UI.user_error! "Red, fail and raise an exception."
end