app.nim

import std/[os, random, strutils, terminal]

randomize() # Initialize the RNG with a new seed each run
hideCursor() # Hide the cursor during runtime

var target, output: string
setForeGroundColor(fgGreen)
if paramCount() >= 1:
  target = paramStr(1)
else:
  target = "Hello World From Nim!"
output = spaces(target.len)

for i, x in target:
  while x != output[i]:
    output[i] = chr(rand(32 .. 126))
    # Instead of writing a bunch of new lines, we can just write to the same
    # line repeatedly.
    eraseLine()
    stdout.write(output)
    stdout.flushFile() # Force writing to console every iteration
    sleep(3) # milliseconds
# Add a new line at the end of program execution to keep the terminal tidy.
echo ""
showCursor() # Bring the cursor ba