tangle.mu


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# Compatible with ranger 1.5.3 through 1.7.*
#
# Change the prompt when you open a shell from inside ranger
#
# Add this line to your .bashrc for it to work.

[ -n "$RANGER_LEVEL" ] && PS1="$PS1"'(in ranger) '

factorial n:num -> result:num [
  local-scope
  load-inputs
  <factorial-cases>
]

after <factorial-cases> [
  # if n=0 return 1
  return-unless n, 1
]

after <factorial-cases> [
  # return n * factorial(n - 1)
  {
    break-unless n
    x:num <- subtract n, 1
    subresult:num <- factorial x
    result <- multiply subresult, n
    return result
  }
]

def main [
  1:num <- factorial 5
  # trailing space in next line is to help with syntax highlighting
  $print [result: ], 1:num, [ 
]
]