Work around AutoIT stdin limitation

The fastest way to implement a small script and to process a file (or a chunk of data) is to use the standard input rather than file-handles.

1/ It is easier to redirect a file instead of providing parameters to a program.

2/ When you use redirections, the operating system works for you: it opens the file and feeds the program with its content.

C:\> AutoIt3.exe DiffPrettyfier.au3 < MyInput.txt > MyOutput.txt

The content of the script is straight forward:

$myInput = ConsoleRead()

; do something here

; (...)

ConsoleWrite($myOutput)

But there is one problem that makes this a bit harder: AutoIT 'ConsoleRead' doesn't handle input bigger than '65535' characters. So here is a little workaround: use the function 'StdinRead' below instead of 'ConsoleRead':

;-----------------------------------------------------------------

; Name .........: StdinRead

; Description ..: Wrapper for ConsoleRead because it doesn't

; handle big files

; Warning ......: This is a workaround but it has limitations too,

; I used a big file to test this function but it

; might fail on a VERY big file (eg. if the file

; contains 2 147 483 647 characters)

; original big file tested: 18 030 950

; biggest string size allowed: 2 147 483 647

; Parameters ...: n/a

; Return .......: String read on STDIN or empty String "" if

; nothing found on STDIN

;-----------------------------------------------------------------

Func StdinRead()

Const $MAX_BUFFER = 65535

$eofReached = False

$fileContent = ""

While Not $eofReached

$buffer = ConsoleRead($MAX_BUFFER)

If @error Or $buffer = "" Then $eofReached = True

$fileContent &= $buffer

WEnd

Return $fileContent

EndFunc ;==>StdinRead

NOTE: For "ConsoleWrite" to work as expected (redirecting output to stdout), you need to compile the script using the "/console" switch.