Subcommand Dispatch

A subcommand lets one program route to several related actions.

subcommand_dispatch.rb

args = 
subcommand = args.first || "help"

message = case subcommand
when "init"
  "create project"
when "status"
  "show status"
else
  "show help"
end

handled = ["init", "status"].include?(subcommand)

puts "subcommand=#{subcommand}"
puts "message=#{message}"
puts "handled=#{handled}"

args = 
subcommand = args.first || "help"

message = case subcommand
when "init"
  "create project"
when "status"
  "show status"
else
  "show help"
end

handled = ["init", "status"].include?(subcommand)

puts "subcommand=#{subcommand}"
puts "message=#{message}"
puts "handled=#{handled}"

args = 
subcommand = args.first || "help"

message = case subcommand
when "init"
  "create project"
when "status"
  "show status"
else
  "show help"
end

handled = ["init", "status"].include?(subcommand)

puts "subcommand=#{subcommand}"
puts "message=#{message}"
puts "handled=#{handled}"

subcommand `case` is a compact way to map the first argument to a command handler.