Taking a specific time from command line is not working

Question

I have a program, which calculate many things. While I run the code by ruby code.rb everything is okay. The problem starts, when I want to run it by command line with additional option: ruby code.rb --time 201712121100.

The piece of problematic code is below:

include Options #here I have some options to choose, like --time

def calculate_p(time, mode)
   if mode
      calculator = calc1
   else
      calculator = calc2
   end
   calculate_t(time, calculator)
 end

def calculate_t(time, calculator)
   date_ymd = time.strftime("%Y%m%d")
   time_hm  = time.strftime("%H%M")

   calculator
     .with(date_ymd, time_hm)
   .run do |result|
      if result.ok?
         result.stdout.pop.split.first
      else
        msgw("Program returned with errors.", :error)
        msgw("stdout: %s; stderr: %s" % [result.stdout, result.stderr], :error)
        false
      end
    end
 end

time  = Options.get('--time')
           .andand do |time_op|
              msgw('Taking time from command line arguments') do
                time_op.pop.andand
              end
            end || msgw('Calculating time for now.') do
              Time.now.utc
            end || abort
calc=calculate_p(time, mode)

msgw is just define to print messages.

mode takes true or false values.

I received an error:

"calculate_t: undefined method strftime for "201712121100":String (NoMethodError)"

What am I doing wrong? Why using Time.now.utc is working while giving a specific time is not?

I also checked the solutions from here Rails undefined method `strftime' for "2013-03-06":String and Date.parse() gives the same error.

Answer 1

The issue is here:

time_op.pop.andand

time_op taken from the command line is a string, and you need a Time instance. The get it, use DateTime#strptime:

DateTime.strptime(time_op.pop, "%Y%m%d%H%M").to_time.andand