使用jruby -c语法检查来检查ruby / jruby脚本的语法（内部ruby代码）

Question

I am in a search of some way , using which in ruby code I should be able to create a temp file and then append some ruby code in that, then pass that temp file path to jruby -c to check for any syntax errors.

Currently I am trying the following approach:

script_file = File.new("#{Rails.root}/test.rb", "w+") 
            script_file.print(content)
            script_file.close
command = "#{RUBY_PATH} -c #{Rails.root}/test.rb"
            eval(command);
            new_script_file.close

When I inspect command var, it is properly showing jruby -c {ruby file path}. But when I execute the above piece of code I am getting the following error:

Completed 500 Internal Server Error in 41ms

SyntaxError ((eval):1: dhunknown regexp options - dh):

Let me know if any one has any idea on this.

Thanks, Dean

Answer 1

eval evaluates the string as Ruby code , not as a command line invocation: Since your command is not valid Ruby syntax, you get this exception.

If you want to launch a command in Ruby, you can use %x{} or ``:

output1 = ls

output2 = %x{ls}

Both forms will return the output of the launched command as a String, if you want to process it. If you want this output to be directly displayed in the user terminal, you can use system():

system("ls")