Print editable to console in Ruby [duplicate] - ruby

Question

This question already has answers here:
What will give me something like ruby readline with a default value?
(6 answers)
Closed 6 years ago.
Let's say I have the following code in Ruby:
print("Enter a filename:")
editableprint("untitled.txt")
filename = gets.chomp!
What would be the function "editableprint" so that "untitled.txt" is part of the input of the user for the gets function? (thus the user can edit the "untitled.txt" string or simply leave it as is")

Answer 1

There are similar questions here and here
However, the solutions there don't seem to work as expected, so it looks this is ruby version or platform dependent?
For example, this does not work for me, but also does not throw an error.
require "readline"
filename = Readline.insert_text("untitled.txt").readline("Enter a filename:")
print filename
But since it looks much better, and should work according to the documentation for ruby >= 2, I am leaving it there for now.
The following works on my system (ruby 2.3.1, OS X)
require "readline"
require 'rb-readline'
module RbReadline
def self.prefill_prompt(str)
#rl_prefill = str
#rl_startup_hook = :rl_prefill_hook
end
def self.rl_prefill_hook
rl_insert_text #rl_prefill if #rl_prefill
#rl_startup_hook = nil
end
end
RbReadline.prefill_prompt("untitled.txt")
str = Readline.readline("Enter a filename:", true)
puts "You entered: #{str}"

Answer 2

I would use vim to edit the file. Vim will save edited files in ~/.viminfo. The last edited file is marked with '0. The pattern of a file entry is 'N N N filename where N stands for a integer.
def editableprint(filename)
system "vi #{filename}"
regex = /(?<='0\s{2}\d\s{2}\d\s{2}).*/
viminfo = File.expand_path("~/.viminfo")
File.read(viminfo).scan(regex).first
end
In order to make this to work you would have to change your code
print("Enter a filename:")
filename = gets.chomp!
filename = "untitled.txt" if filename.emtpy?
edited_filename = editableprint("untitled.txt")