Example LINER.PRT
; LINER
;
; Program for Proteus
;
; (C) 1998-2004 Simone Zanella Productions
;
; Copy each line, adding to the left its number

FUNCTION ONSTART()

  IF STREQ(ARGV(3), "..")
    CONSOLELN "Syntax: " ARGV(1) " " ARGV(2) " source destination"
    CONSOLELN ""
    CONSOLELN "Purpose: write to destination each line in source, prefixed by its number"
    ABORT 0
  FI
RETURN

FUNCTION ONEND()

  ; First, determine the number of lines in the file; at the end,
  ; open the file again and read each number, writing it after prefixed
  ; by each number. Every line starts at the same column, because
  ; the prefix has fixed length.
  h = FOPEN(ARGV(3), 1)
  m = STRLEN(PUB(N))
  nn = 1
  IF NEQ(h, -1)
    WHILE NOT(FEOF(h))
      PRINTLN PADL(nn, m, "0") ": " FREADLN(h)
      INC(@nn)
    LOOP
    FCLOSE(h)
  FI
RETURN
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