Doubled newlines

[Steven Schveighoffer]

On Sat, 31 Jul 2010 23:10:05 -0400, Andrej Mitrovic  
<andrej.mitrovich at gmail.com> wrote:

> Oh and I'm getting the same issue in Python when using CR only. I don't  
> know why I have the CR option in the text editor if it doesn't work  
> properly. I guess CR is used on the Macs maybe..?
>
> Andrej Mitrovic Wrote:
>
>> I'm getting normal newlines here (XP):
>>
>> C:\output>test.exe
>> import std.file: readText;
>> import std.stdio: write;
>> void main() {
>>     string s = readText("test.d");
>>     write(s);
>> }
>>
>> The text used CR+LF newlines. I also tried them using LF newlines,  
>> which worked fine. But I've then tried with CR and that gives out weird  
>> output like so:
>>
>> }   write(s);= readText("test.d");

CR means carriage return.  This is for old-style line printers.  When you  
sent a CR, it means, literally, move the carriage back to the front of the  
line.  When you sent a LF (line feed), it means, feed the paper another  
line.

If you printed a file to such a printer with just line feeds, you would  
see:

import std.file: readText;
                           import std.stdio: write;
                                                   void main() {
...


If you printed the file with just CRs, you would see all the lines  
super-imposed over eachother, because the paper is never moved, just the  
carriage is returned.

This is the effect you are seeing, each line is super-imposed over the  
other.  However, on a terminal, you don't see the residual letters from  
previously printed lines, they are completely overwritten.

Essentially, if you put in a sleep between printing each line, what you'd  
see is this:

import std.file: readText;

.. pause ..

import std.stdio: write;t;

.. pause ..

void main() {dio: write;t;

....

Hope this helps ;)

-Steve