How to run a file in pry that takes arguments - ruby

Question

I can start a pry session of a command line app like this
pry -r ./todo.rb
However, if I want to call the list function
pry -r ./todo.rb list
I'm getting an error message.
Without pry, I call the list function
ruby todo.rb list
This is the error message
/Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/repl_file_loader.rb:16:in `initialize': No such file: /Users/michaeljohnmitchell/Sites/todo/bin/list (RuntimeError)
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/pry_class.rb:161:in `new'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/pry_class.rb:161:in `load_file_through_repl'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/cli.rb:162:in `block in <top (required)>'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/cli.rb:65:in `call'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/cli.rb:65:in `block in parse_options'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/cli.rb:65:in `each'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/lib/pry/cli.rb:65:in `parse_options'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/gems/pry-0.9.10/bin/pry:16:in `<top (required)>'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/bin/pry:19:in `load'
from /Users/michaeljohnmitchell/.rvm/gems/ruby-1.9.2-p290#global/bin/pry:19:in `<main>'
Source Code
TODO_FILE = 'todo.txt'
def read_todo(line)
line.chomp.split(/,/)
end
def write_todo(file,name,created=Time.now,completed='')
file.puts("#{name},#{created},#{completed}")
end
command = ARGV.shift
case command
when 'new'
new_task = ARGV.shift
File.open(TODO_FILE,'a') do |file|
write_todo(file,new_task)
puts "Task added."
end
when 'list'
File.open(TODO_FILE,'r') do |file|
counter = 1
file.readlines.each do |line|
name,created,completed = read_todo(line)
printf("%3d - %s\n",counter,name)
printf(" Created : %s\n",created)
unless completed.nil?
printf(" Completed : %s\n",completed)
end
counter += 1
end
end
when 'done'
task_number = ARGV.shift.to_i
binding.pry
File.open(TODO_FILE,'r') do |file|
File.open("#{TODO_FILE}.new",'w') do |new_file|
counter = 1
file.readlines.each do |line|
name,created,completed = read_todo(line)
if task_number == counter
write_todo(new_file,name,created,Time.now)
puts "Task #{counter} completed"
else
write_todo(new_file,name,created,completed)
end
counter += 1
end
end
end
`mv #{TODO_FILE}.new #{TODO_FILE}`
end
Update
when I try
pry -r ./todo.rb -e list
I'm getting the following error
NameError: undefined local variable or method `list' for main:Object

Answer 1

From pry --help:
-e, --exec A line of code to execute in context before the session starts
So, if your list method is defined on main (if you don't know, it probably is), then you can do this:
pry -r ./todo.rb -e list
Update
Pry doesn't let you pass in arguments for scripts it loads (or at least it isn't documented). But all is not lost, you can call pry from your script. Just drop this at wherever you want to inspect:
require 'pry'; binding.pry
This will spawn a pry session that has access to all the local variables and methods.

Answer 2

I think you can use:
ruby -rpry ./todo.rb -e list