Hello, I just wrote a mock-up of Unix's $cat. However unlike the actual $cat, when input interrupt (Cntrl+D) is pressed the following program does not stop.

So I tried using C's EOF but the types aren't compatible since EOF is probably aliased to -1

//...
if (args.length < 2)
    {
        string input = readln();
        while (input != EOF)
        {
            input.write();
        }
    }
//...


Tips?



Here is the full program:



import std.stdio;
import std.file;

void main(string[] args)
{
    if (args.length < 2)
    {
        string input = readln();
        while (input != EOF)
        {
            input.write();
        }
    }
    else
    {
        foreach (path; args[1..$])
        {
            auto current_file = File(path, "r");
            while (!(current_file.eof()))
            {
                current_file.readln().write();
            }
            current_file.close();
        }
    }
}

On Sunday, 28 May 2017 at 22:07:12 UTC, helxi wrote:
> So I tried using C's EOF but the types aren't compatible since EOF is probably aliased to -1


The readln docs for D say it returns null on end of file. The example given is:

import std.stdio;

void main()
{
    string line;
    while ((line = readln()) !is null)
        write(line);
}

http://dpldocs.info/experimental-docs/std.stdio.readln.1.html

I would try that.

On Sunday, 28 May 2017 at 22:14:46 UTC, Adam D. Ruppe wrote:
> On Sunday, 28 May 2017 at 22:07:12 UTC, helxi wrote:
>> So I tried using C's EOF but the types aren't compatible since EOF is probably aliased to -1
>
>
> The readln docs for D say it returns null on end of file. The example given is:
>
> import std.stdio;
>
> void main()
> {
>     string line;
>     while ((line = readln()) !is null)
>         write(line);
> }
>
> http://dpldocs.info/experimental-docs/std.stdio.readln.1.html
>
> I would try that.

Oh yes, fantastic,
I also seem to have forgotten EOF was meant to compare chars, not strings.