Write a REPL in Ruby

repls.sh

# Part of a post here: https://medium.com/@josh.cheek/c45dac057a1a

ruby -e 'loop { p eval gets }'

ruby -e '
   bnd = binding()          # gets a new binding
   loop { p bnd.eval gets } # eval within the same binding each time
'

ruby -r readline -e '
   bnd = binding()
   loop do
     input = Readline.readline("> ", true) # readline in place of gets
     p bnd.eval input
   end
'

ruby -r coderay -r readline -e '
   bnd = binding()
   loop do
     input  = Readline.readline("> ", true)
     result = bnd.eval input
     puts CodeRay.encode(result.inspect, :ruby, :terminal)
   end
'

ruby -r coderay -r readline -e '
   bnd = binding()
   while input = Readline.readline("> ", true)
     result = bnd.eval input
     puts CodeRay.encode(result.inspect, :ruby, :terminal)
   end
'

ruby -r coderay -r readline -e '
   bnd = binding()
   while input = Readline.readline("> ", true)
     begin
       result = bnd.eval input
       puts CodeRay.encode(result.inspect, :ruby, :terminal)
     rescue StandardError => e
       puts "\e[31m#{e.class}:\e[0m #{e.message}"
     end
   end
'